v3.26.3
Investments - Individual Investments in the Portfolios of SLP IV, Principal Amount, Cost and Fair Value (Details)
€ in Thousands, £ in Thousands, $ in Thousands
Sep. 30, 2026
USD ($)
Sep. 30, 2026
EUR (€)
 [3],[4],[9],[20],[52]
Sep. 30, 2026
GBP (£)
 [3],[4],[9],[20],[52]
Dec. 31, 2025
USD ($)
Dec. 31, 2025
EUR (€)
 [7],[8],[11]
Dec. 31, 2025
GBP (£)
 [7],[8],[11],[16],[51]
Dec. 31, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
May 03, 2013
USD ($)
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost $ 2,453,990 [1]     $ 2,912,115 [2]              
Fair Value 2,259,962 [1]     2,742,013 [2]              
Investment, Identifier [Axis]: AAC Lender Holdings, LLC | Ordinary Shares                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [3],[4],[5] 0                    
Fair Value [3],[4],[5] 0                    
Investment, Identifier [Axis]: AAC Lender Holdings, LLC | Ordinary shares                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [6],[7],[8]       0              
Fair Value [6],[7],[8]       0              
Investment, Identifier [Axis]: AAH Topco, LLC | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 3,659 [3],[4],[9],[10]     3,659 [7],[8],[11],[12]              
Cost (37) [3],[4],[10]     (37) [7],[8],[12]              
Fair Value 0 [3],[4],[10]     0 [7],[8],[12]              
Investment, Identifier [Axis]: AAH Topco, LLC | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 9,426 [3],[9],[13]     22,502 [7],[11],[14],[15]              
Cost 9,402 [3],[13]     22,398 [7],[14],[15]              
Fair Value 9,426 [3],[13]     22,502 [7],[14],[15]              
Investment, Identifier [Axis]: AAH Topco, LLC | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 7,244 [3],[9],[13]     20,009 [7],[8],[11],[16]              
Cost 7,223 [3],[13]     19,932 [7],[8],[16]              
Fair Value 7,244 [3],[13]     20,009 [7],[8],[16]              
Investment, Identifier [Axis]: AAH Topco, LLC | First lien 3                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 5,955 [3],[9],[17],[18]     9,500 [7],[11],[19]              
Cost 5,938 [3],[17],[18]     9,463 [7],[19]              
Fair Value 5,955 [3],[17],[18]     9,500 [7],[19]              
Investment, Identifier [Axis]: AAH Topco, LLC | First lien 4                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 3,482 [3],[4],[9],[20]     7,300 [7],[11],[19]              
Cost 3,474 [3],[4],[20]     7,267 [7],[19]              
Fair Value 3,482 [3],[4],[20]     7,300 [7],[19]              
Investment, Identifier [Axis]: AAH Topco, LLC | Subordinated 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 7,543 [3],[9],[13]     17,649 [7],[8],[11],[16]              
Cost 7,499 [3],[13]     17,527 [7],[8],[16]              
Fair Value 7,430 [3],[13]     17,418 [7],[8],[16]              
Investment, Identifier [Axis]: AAH Topco, LLC | Subordinated 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 888 [3],[4],[9],[20]     6,921 [7],[11],[19]              
Cost 883 [3],[4],[20]     6,873 [7],[19]              
Fair Value 875 [3],[4],[20]     6,831 [7],[19]              
Investment, Identifier [Axis]: ACI Group Holdings, Inc. | First lien - Drawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       2,330              
Cost [7],[8],[12]       2,307              
Fair Value [7],[8],[12]       1,864              
Investment, Identifier [Axis]: ACI Group Holdings, Inc. | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12],[21]       24              
Cost [7],[8],[12],[21]       0              
Fair Value [7],[8],[12],[21]       (5)              
Investment, Identifier [Axis]: ACI Group Holdings, Inc. | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[11],[14],[15]       22,643              
Cost [7],[14],[15]       22,547              
Fair Value [7],[14],[15]       18,114              
Investment, Identifier [Axis]: ACI Group Holdings, Inc. | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[16]       4,346              
Cost [7],[8],[16]       4,319              
Fair Value [7],[8],[16]       3,477              
Investment, Identifier [Axis]: ACI Group Holdings, Inc. | First lien 3                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[16]       4,014              
Cost [7],[8],[16]       3,994              
Fair Value [7],[8],[16]       3,211              
Investment, Identifier [Axis]: ACI Parent Inc. | Preferred shares                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount       20,249              
Cost [7],[8],[21]       20,124              
Fair Value [7],[8],[21]       2,087              
Investment, Identifier [Axis]: AI Altius US Bidco, Inc. | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[16]       3,062              
Cost [7],[8],[16]       3,051              
Fair Value [7],[8],[16]       3,062              
Investment, Identifier [Axis]: AI Altius US Bidco, Inc. | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       3,077              
Cost [7],[8],[12]       0              
Fair Value [7],[8],[12]       0              
Investment, Identifier [Axis]: AWP Group Holdings, Inc. | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[9],[17],[18] 8,697                    
Cost [3],[17],[18] 8,666                    
Fair Value [3],[17],[18] 8,664                    
Investment, Identifier [Axis]: AWP Group Holdings, Inc. | First lien - Drawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10],[20] 405                    
Cost [3],[4],[10],[20] 403                    
Fair Value [3],[4],[10],[20] 403                    
Investment, Identifier [Axis]: AWP Group Holdings, Inc. | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10] 959                    
Cost [3],[4],[10] (4)                    
Fair Value [3],[4],[10] (4)                    
Investment, Identifier [Axis]: Acumatica Holdings, Inc. | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 13,759 [3],[9],[17],[18]     39,188 [7],[11],[14],[15]              
Cost 13,759 [3],[17],[18]     39,188 [7],[14],[15]              
Fair Value 13,713 [3],[17],[18]     39,188 [7],[14],[15]              
Investment, Identifier [Axis]: Acumatica Holdings, Inc. | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 9,403 [3],[4],[9],[10]     9,403 [7],[8],[11],[12]              
Cost 0 [3],[4],[10]     0 [7],[8],[12]              
Fair Value (31) [3],[4],[10]     0 [7],[8],[12]              
Investment, Identifier [Axis]: Adelaide Borrower, LLC | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 4,780 [3],[4],[9],[20]     4,780 [7],[8],[11],[16]              
Cost 4,748 [3],[4],[20]     4,743 [7],[8],[16]              
Fair Value 4,780 [3],[4],[20]     4,780 [7],[8],[16]              
Investment, Identifier [Axis]: Adelaide Borrower, LLC | First lien - Drawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 288 [3],[4],[9],[10],[20]     120 [7],[8],[11],[12],[16]              
Cost 285 [3],[4],[10],[20]     119 [7],[8],[12],[16]              
Fair Value 288 [3],[4],[10],[20]     120 [7],[8],[12],[16]              
Investment, Identifier [Axis]: Adelaide Borrower, LLC | First lien - Undrawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 760 [3],[4],[9],[10]     1,048 [7],[8],[11],[12]              
Cost 0 [3],[4],[10]     0 [7],[8],[12]              
Fair Value 0 [3],[4],[10]     0 [7],[8],[12]              
Investment, Identifier [Axis]: Adelaide Borrower, LLC | First lien - Undrawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 667 [3],[4],[9],[10]     547 [7],[8],[11],[12]              
Cost (7) [3],[4],[10]     (5) [7],[8],[12]              
Fair Value 0 [3],[4],[10]     0 [7],[8],[12]              
Investment, Identifier [Axis]: Alegeus Technologies Holdings Corp. | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[16]       8,382              
Cost [7],[8],[16]       8,297              
Fair Value [7],[8],[16]       8,382              
Investment, Identifier [Axis]: Ambrosia Holdco Corp. | Class A-1 Common Units 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [3],[18] 1,348                    
Fair Value [3],[18] 37                    
Investment, Identifier [Axis]: Ambrosia Holdco Corp. | Class A-1 Common Units 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [3],[4] 1,300                    
Fair Value [3],[4] 36                    
Investment, Identifier [Axis]: Ambrosia Topco LLC | Class A-1 common units 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [7],[15]       1,348              
Fair Value [7],[15]       590              
Investment, Identifier [Axis]: Ambrosia Topco LLC | Class A-1 common units 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [7],[8]       1,300              
Fair Value [7],[8]       569              
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc. | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 1,969 [3],[4],[9],[10]     1,969 [7],[8],[11],[12]              
Cost (10) [3],[4],[10]     (10) [7],[8],[12]              
Fair Value (109) [3],[4],[10]     (15) [7],[8],[12]              
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc. | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 18,623 [3],[4],[9],[20]     18,769 [7],[8],[11],[16]              
Cost 18,596 [3],[4],[20]     18,729 [7],[8],[16]              
Fair Value 17,589 [3],[4],[20]     18,626 [7],[8],[16]              
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc. | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 5,183 [3],[9],[17],[18]     5,223 [7],[11],[14],[15]              
Cost 5,174 [3],[17],[18]     5,211 [7],[14],[15]              
Fair Value 4,895 [3],[17],[18]     5,183 [7],[14],[15]              
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc. | First lien 3                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 681 [3],[4],[9],[20]     686 [7],[8],[11],[16]              
Cost 679 [3],[4],[20]     684 [7],[8],[16]              
Fair Value 643 [3],[4],[20]     681 [7],[8],[16]              
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.) | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 31,406                    
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.) | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 2,652 [3],[4],[5],[9],[10]     2,652 [6],[7],[8],[11],[12]              
Cost 0 [3],[4],[5],[10]     0 [6],[7],[8],[12]              
Fair Value 0 [3],[4],[5],[10]     0 [6],[7],[8],[12]              
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.) | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 29,879 [3],[4],[9],[20]     29,879 [7],[8],[11],[16]              
Cost 29,842 [3],[4],[20]     29,842 [7],[8],[16]              
Fair Value 16,000 [3],[4],[20]     17,999 [7],[8],[16]              
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.) | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 1,527 [3],[4],[9]     1,527 [7],[8],[11]              
Cost 1,527 [3],[4]     1,527 [7],[8]              
Fair Value 0 [3],[4]     0 [7],[8]              
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.) | First lien | Non-accrual status                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount               $ 17,927 $ 13,479    
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.) | Subordinated                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 5,230 [3],[4],[9]     5,230 [7],[8],[11]              
Cost 0 [3],[4]     0 [7],[8]              
Fair Value 0 [3],[4]     0 [7],[8]              
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.) | Subordinated | Non-accrual status                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount                   $ 5,230  
Investment, Identifier [Axis]: Anaplan, Inc. | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[11],[14],[15]       10,513              
Cost [7],[14],[15]       10,456              
Fair Value [7],[14],[15]       10,513              
Investment, Identifier [Axis]: Associations Finance, Inc. | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[20] 29,794                    
Cost [3],[4],[20] 29,787                    
Fair Value [3],[4],[20] 29,794                    
Investment, Identifier [Axis]: Associations Finance, Inc. | First lien - Drawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10] 2,199                    
Cost [3],[4],[10] 2,198                    
Fair Value [3],[4],[10] 2,199                    
Investment, Identifier [Axis]: Associations Finance, Inc. | Subordinated 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9] 10,200                    
Cost [3],[4] 10,187                    
Fair Value [3],[4] 10,200                    
Investment, Identifier [Axis]: Associations Finance, Inc. | Subordinated 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9] 3,895                    
Cost [3],[4] 3,890                    
Fair Value [3],[4] 3,895                    
Investment, Identifier [Axis]: Associations, Inc. | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[16]       48,932              
Cost [7],[8],[16]       48,915              
Fair Value [7],[8],[16]       48,932              
Investment, Identifier [Axis]: Associations, Inc. | First lien - Drawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       1,639              
Cost [7],[8],[12]       1,639              
Fair Value [7],[8],[12]       1,639              
Investment, Identifier [Axis]: Associations, Inc. | First lien - Undrawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 1,612 [3],[4],[9],[10]     2,186 [7],[8],[11],[12]              
Cost (1) [3],[4],[10]     (1) [7],[8],[12]              
Fair Value 0 [3],[4],[10]     0 [7],[8],[12]              
Investment, Identifier [Axis]: Associations, Inc. | First lien - Undrawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 3,077 [3],[4],[9],[10]     3,077 [7],[8],[11],[12]              
Cost (2) [3],[4],[10]     (2) [7],[8],[12]              
Fair Value 0 [3],[4],[10]     0 [7],[8],[12]              
Investment, Identifier [Axis]: Associations, Inc. | Subordinated 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11]       9,173              
Cost [7],[8]       9,158              
Fair Value [7],[8]       9,356              
Investment, Identifier [Axis]: Associations, Inc. | Subordinated 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11]       3,503              
Cost [7],[8]       3,497              
Fair Value [7],[8]       3,593              
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12],[22]       790              
Cost [7],[8],[12],[22]       (6)              
Fair Value [7],[8],[12],[22]       0              
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 4,429 [3],[9],[17],[18]     4,463 [7],[11],[14],[15]              
Cost 4,421 [3],[17],[18]     4,453 [7],[14],[15]              
Fair Value 4,429 [3],[17],[18]     4,463 [7],[14],[15]              
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 3,385 [3],[4],[9],[20]     3,411 [7],[8],[11],[16]              
Cost 3,357 [3],[4],[20]     3,377 [7],[8],[16]              
Fair Value 3,385 [3],[4],[20]     3,411 [7],[8],[16]              
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd | First lien 3                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 1,318 [3],[4],[9],[20]     1,328 [7],[8],[11],[16]              
Cost 1,310 [3],[4],[20]     1,319 [7],[8],[16]              
Fair Value 1,318 [3],[4],[20]     1,328 [7],[8],[16]              
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd| First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10],[23] 790                    
Cost [3],[4],[10],[23] (6)                    
Fair Value [3],[4],[10],[23] 0                    
Investment, Identifier [Axis]: Auctane Inc. (fka Stamps.com Inc.) | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 31,814 [3],[4],[9],[20]     36,155 [7],[8],[11],[16]              
Cost 31,584 [3],[4],[20]     35,985 [7],[8],[16]              
Fair Value 31,576 [3],[4],[20]     36,155 [7],[8],[16]              
Investment, Identifier [Axis]: Baker Tilly Advisory Group, LP | First lien - Drawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10],[20] 2,383                    
Cost [3],[4],[10],[20] 2,367                    
Fair Value [3],[4],[10],[20] 2,383                    
Investment, Identifier [Axis]: Baker Tilly Advisory Group, LP | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10] 1,324                    
Cost [3],[4],[10] (10)                    
Fair Value [3],[4],[10] 0                    
Investment, Identifier [Axis]: Baker Tilly Advisory Group, LP | First lien - Undrawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       2,122              
Cost [7],[8],[12]       0              
Fair Value [7],[8],[12]       0              
Investment, Identifier [Axis]: Baker Tilly Advisory Group, LP | First lien - Undrawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       3,707              
Cost [7],[8],[12]       (26)              
Fair Value [7],[8],[12]       0              
Investment, Identifier [Axis]: Baker Tilly Advisory Group, LP | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 15,484 [3],[9],[17],[18]     15,602 [7],[11],[14],[15]              
Cost 15,398 [3],[17],[18]     15,504 [7],[14],[15]              
Fair Value 15,484 [3],[17],[18]     15,602 [7],[14],[15]              
Investment, Identifier [Axis]: Baker Tilly Advisory Group, LP | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 5,739 [3],[9],[17],[18]     5,782 [7],[11],[14],[15]              
Cost 5,715 [3],[17],[18]     5,756 [7],[14],[15]              
Fair Value 5,739 [3],[17],[18]     5,782 [7],[14],[15]              
Investment, Identifier [Axis]: Baker Tilly Advisory Group, LP | First lien 3                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 2,488 [3],[4],[9],[20]     378 [7],[8],[11],[16]              
Cost 2,476 [3],[4],[20]     376 [7],[8],[16]              
Fair Value 2,488 [3],[4],[20]     378 [7],[8],[16]              
Investment, Identifier [Axis]: Bamboo Health Holdings, LLC (f/k/a Appriss Health, LLC) | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 3,035 [3],[4],[9],[20]     3,046 [7],[8],[11],[16]              
Cost 3,031 [3],[4],[20]     3,038 [7],[8],[16]              
Fair Value 3,035 [3],[4],[20]     3,046 [7],[8],[16]              
Investment, Identifier [Axis]: Bamboo Health Holdings, LLC (f/k/a Appriss Health, LLC) | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 417 [3],[4],[9],[10]     417 [7],[8],[11],[12]              
Cost (4) [3],[4],[10]     (4) [7],[8],[12]              
Fair Value 0 [3],[4],[10]     0 [7],[8],[12]              
Investment, Identifier [Axis]: Bonterra LLC | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[11],[14],[15]       14,989              
Cost [7],[14],[15]       14,955              
Fair Value [7],[14],[15]       14,952              
Investment, Identifier [Axis]: Bonterra LLC | First lien - Drawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10] 521                    
Cost [3],[4],[10] 520                    
Fair Value [3],[4],[10] 512                    
Investment, Identifier [Axis]: Bonterra LLC | First lien - Drawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12],[16]       1,629              
Cost [7],[8],[12],[16]       1,629              
Fair Value [7],[8],[12],[16]       1,625              
Investment, Identifier [Axis]: Bonterra LLC | First lien - Drawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       244              
Cost [7],[8],[12]       244              
Fair Value [7],[8],[12]       244              
Investment, Identifier [Axis]: Bonterra LLC | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10] 1,107                    
Cost [3],[4],[10] (3)                    
Fair Value [3],[4],[10] (19)                    
Investment, Identifier [Axis]: Bonterra LLC | First lien - Undrawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       0              
Cost [7],[8],[12]       0              
Fair Value [7],[8],[12]       0              
Investment, Identifier [Axis]: Bonterra LLC | First lien - Undrawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       1,384              
Cost [7],[8],[12]       (3)              
Fair Value [7],[8],[12]       (3)              
Investment, Identifier [Axis]: Bonterra LLC | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[9],[17],[18] 14,876                    
Cost [3],[17],[18] 14,846                    
Fair Value [3],[17],[18] 14,615                    
Investment, Identifier [Axis]: Bonterra LLC | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[20] 1,620                    
Cost [3],[4],[20] 1,620                    
Fair Value [3],[4],[20] 1,592                    
Investment, Identifier [Axis]: Brave Parent Holdings, Inc. | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 20,963 [3],[9],[24]     21,124 [7],[11],[25]              
Cost 20,890 [3],[24]     21,040 [7],[25]              
Fair Value 20,542 [3],[24]     21,124 [7],[25]              
Investment, Identifier [Axis]: Bullhorn, Inc. | First lien - Drawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 125 [3],[4],[9],[10]     125 [7],[8],[11],[12]              
Cost 127 [3],[4],[10]     127 [7],[8],[12]              
Fair Value 125 [3],[4],[10]     125 [7],[8],[12]              
Investment, Identifier [Axis]: Bullhorn, Inc. | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10] 811                    
Cost [3],[4],[10] (6)                    
Fair Value [3],[4],[10] 0                    
Investment, Identifier [Axis]: Bullhorn, Inc. | First lien - Undrawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       822              
Cost [7],[8],[12]       0              
Fair Value [7],[8],[12]       0              
Investment, Identifier [Axis]: Bullhorn, Inc. | First lien - Undrawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       811              
Cost [7],[8],[12]       (6)              
Fair Value [7],[8],[12]       0              
Investment, Identifier [Axis]: Bullhorn, Inc. | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 8,879 [3],[9],[17],[18]     13,206 [7],[11],[14],[15]              
Cost 8,961 [3],[17],[18]     13,177 [7],[14],[15]              
Fair Value 8,879 [3],[17],[18]     13,206 [7],[14],[15]              
Investment, Identifier [Axis]: Bullhorn, Inc. | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 3,398 [3],[9],[17],[18]     8,879 [7],[11],[14],[15]              
Cost 3,395 [3],[17],[18]     8,976 [7],[14],[15]              
Fair Value 3,398 [3],[17],[18]     8,879 [7],[14],[15]              
Investment, Identifier [Axis]: Bullhorn, Inc. | First lien 3                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 1,025 [3],[4],[9],[20]     3,398 [7],[11],[14],[15]              
Cost 1,023 [3],[4],[20]     3,395 [7],[14],[15]              
Fair Value 1,025 [3],[4],[20]     3,398 [7],[14],[15]              
Investment, Identifier [Axis]: Bullhorn, Inc. | First lien 4                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 761 [3],[9],[17],[18]     1,025 [7],[8],[11],[16]              
Cost 759 [3],[17],[18]     1,023 [7],[8],[16]              
Fair Value 761 [3],[17],[18]     1,025 [7],[8],[16]              
Investment, Identifier [Axis]: Bullhorn, Inc. | First lien 5                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 341 [3],[9],[17],[18]     761 [7],[11],[14],[15]              
Cost 340 [3],[17],[18]     759 [7],[14],[15]              
Fair Value 341 [3],[17],[18]     761 [7],[14],[15]              
Investment, Identifier [Axis]: Bullhorn, Inc. | First lien 6                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 272 [3],[9],[17],[18]     341 [7],[11],[14],[15]              
Cost 271 [3],[17],[18]     340 [7],[14],[15]              
Fair Value 272 [3],[17],[18]     341 [7],[14],[15]              
Investment, Identifier [Axis]: Bullhorn, Inc. | First lien 7                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[11],[14],[15]       272              
Cost [7],[14],[15]       271              
Fair Value [7],[14],[15]       272              
Investment, Identifier [Axis]: CFS Management, LLC | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 12,518 [3],[4],[9],[20]     12,124 [7],[8],[11],[16]              
Cost 12,519 [3],[4],[20]     12,124 [7],[8],[16]              
Fair Value 10,327 [3],[4],[20]     10,608 [7],[8],[16]              
Investment, Identifier [Axis]: CFS Management, LLC | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 3,730 [3],[9],[17],[18]     3,612 [7],[11],[14],[15]              
Cost 3,739 [3],[17],[18]     3,621 [7],[14],[15]              
Fair Value 3,077 [3],[17],[18]     3,161 [7],[14],[15]              
Investment, Identifier [Axis]: CG Group Holdings, LLC | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[11],[14],[15]       8,582              
Cost [7],[14],[15]       8,553              
Fair Value [7],[14],[15]       8,582              
Investment, Identifier [Axis]: CG Group Holdings, LLC | First lien - Drawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12],[16]       1,089              
Cost [7],[8],[12],[16]       1,078              
Fair Value [7],[8],[12],[16]       1,089              
Investment, Identifier [Axis]: CG Group Holdings, LLC | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       113              
Cost [7],[8],[12]       (1)              
Fair Value [7],[8],[12]       0              
Investment, Identifier [Axis]: CRCI Longhorn Holdings, Inc. | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[11],[14],[15]       6,451              
Cost [7],[14],[15]       6,423              
Fair Value [7],[14],[15]       6,451              
Investment, Identifier [Axis]: CRCI Longhorn Holdings, Inc. | First lien - Undrawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       1,629              
Cost [7],[8],[12]       0              
Fair Value [7],[8],[12]       0              
Investment, Identifier [Axis]: CRCI Longhorn Holdings, Inc. | First lien - Undrawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       1,086              
Cost [7],[8],[12]       (5)              
Fair Value [7],[8],[12]       0              
Investment, Identifier [Axis]: Capstone Borrower, Inc. | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [4],[9],[20] 3,763                    
Cost [4],[20] 3,286                    
Fair Value [4],[20] 3,621                    
Investment, Identifier [Axis]: Cardinal Parent, Inc. | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 11,517 [9],[13]     11,609 [11],[19]              
Cost 11,500 [13]     11,581 [19]              
Fair Value 10,358 [13]     11,366 [19]              
Investment, Identifier [Axis]: Cardinal Parent, Inc. | Second lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 9,767 [3],[9],[13]     9,767 [7],[11],[19]              
Cost 9,732 [3],[13]     9,721 [7],[19]              
Fair Value 8,546 [3],[13]     9,653 [7],[19]              
Investment, Identifier [Axis]: Centegix Intermediate II, LLC | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[9],[17],[18] 240                    
Cost [3],[17],[18] 239                    
Fair Value [3],[17],[18] 239                    
Investment, Identifier [Axis]: Centegix Intermediate II, LLC | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10] 1,177                    
Cost [3],[4],[10] 0                    
Fair Value [3],[4],[10] (6)                    
Investment, Identifier [Axis]: CentralSquare Technologies, LLC | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 36,234 [3],[9],[17],[18]     36,497 [7],[11],[14],[15]              
Cost 35,951 [3],[17],[18]     36,162 [7],[14],[15]              
Fair Value 36,234 [3],[17],[18]     36,497 [7],[14],[15]              
Investment, Identifier [Axis]: CentralSquare Technologies, LLC | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 3,980 [3],[4],[9],[10]     3,980 [7],[8],[11],[12]              
Cost (50) [3],[4],[10]     (50) [7],[8],[12]              
Fair Value 0 [3],[4],[10]     0 [7],[8],[12]              
Investment, Identifier [Axis]: Ciklum Inc. | First lien - Drawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10],[20] 448                    
Cost [3],[4],[10],[20] 443                    
Fair Value [3],[4],[10],[20] 448                    
Investment, Identifier [Axis]: Ciklum Inc. | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 2,540 [3],[4],[9],[10],[23]     2,989 [7],[8],[11],[12],[22]              
Cost (32) [3],[4],[10],[23]     (37) [7],[8],[12],[22]              
Fair Value 0 [3],[4],[10],[23]     0 [7],[8],[12],[22]              
Investment, Identifier [Axis]: Ciklum Inc. | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 9,368 [3],[9],[17],[18]     9,440 [7],[11],[14],[15]              
Cost 9,294 [3],[17],[18]     9,351 [7],[14],[15]              
Fair Value 9,368 [3],[17],[18]     9,440 [7],[14],[15]              
Investment, Identifier [Axis]: Ciklum Inc. | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 4,701 [3],[4],[9],[20]     5,339 [7],[8],[11],[16]              
Cost 4,657 [3],[4],[20]     5,280 [7],[8],[16]              
Fair Value 4,701 [3],[4],[20]     5,339 [7],[8],[16]              
Investment, Identifier [Axis]: Community Management Holdings MidCo 2, LLC | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[16]       1,291              
Cost [7],[8],[16]       1,279              
Fair Value [7],[8],[16]       1,291              
Investment, Identifier [Axis]: Community Management Holdings MidCo 2, LLC | First lien - Drawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12],[16]       9              
Cost [7],[8],[12],[16]       9              
Fair Value [7],[8],[12],[16]       9              
Investment, Identifier [Axis]: Community Management Holdings MidCo 2, LLC | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       602              
Cost [7],[8],[12]       0              
Fair Value [7],[8],[12]       0              
Investment, Identifier [Axis]: Community Management Holdings MidCo 2, LLC | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[20] 608                    
Cost [3],[4],[20] 603                    
Fair Value [3],[4],[20] 608                    
Investment, Identifier [Axis]: Community Management Holdings MidCo 2, LLC | First lien1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[20] 1,282                    
Cost [3],[4],[20] 1,271                    
Fair Value [3],[4],[20] 1,282                    
Investment, Identifier [Axis]: Compsych Investments Corp | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       2,253              
Cost [7],[8],[12]       (14)              
Fair Value [7],[8],[12]       0              
Investment, Identifier [Axis]: Compsych Investments Corp. | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 7,731 [3],[9],[17],[18]     7,790 [7],[11],[14],[15]              
Cost 7,687 [3],[17],[18]     7,741 [7],[14],[15]              
Fair Value 7,731 [3],[17],[18]     7,790 [7],[14],[15]              
Investment, Identifier [Axis]: Compsych Investments Corp. | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10] 2,253                    
Cost [3],[4],[10] (14)                    
Fair Value [3],[4],[10] 0                    
Investment, Identifier [Axis]: Convey Health Solutions, Inc. | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 13,373 [3],[9],[18]     13,518 [7],[11],[14],[15]              
Cost 12,971 [3],[18]     13,475 [7],[14],[15]              
Fair Value 1,444 [3],[18]     9,869 [7],[14],[15]              
Investment, Identifier [Axis]: Convey Health Solutions, Inc. | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 2,233 [3],[9],[18]     2,257 [7],[11],[14],[15]              
Cost 2,160 [3],[18]     2,244 [7],[14],[15]              
Fair Value 241 [3],[18]     1,648 [7],[14],[15]              
Investment, Identifier [Axis]: CoreTrust Purchasing Group LLC | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 1,459 [3],[4],[9],[20]     1,470 [7],[8],[11],[16]              
Cost 1,453 [3],[4],[20]     1,463 [7],[8],[16]              
Fair Value 1,459 [3],[4],[20]     1,470 [7],[8],[16]              
Investment, Identifier [Axis]: CoreTrust Purchasing Group LLC | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       147              
Cost [7],[8],[12]       (1)              
Fair Value [7],[8],[12]       0              
Investment, Identifier [Axis]: Coupa Holdings, LLC | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[11],[14],[15]       14,243              
Cost [7],[14],[15]       14,123              
Fair Value [7],[14],[15]       14,243              
Investment, Identifier [Axis]: Coupa Holdings, LLC | First lien - Drawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10],[20] 659                    
Cost [3],[4],[10],[20] 651                    
Fair Value [3],[4],[10],[20] 659                    
Investment, Identifier [Axis]: Coupa Holdings, LLC | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10] 330                    
Cost [3],[4],[10] (4)                    
Fair Value [3],[4],[10] 0                    
Investment, Identifier [Axis]: Coupa Holdings, LLC | First lien - Undrawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       1,291              
Cost [7],[8],[12]       0              
Fair Value [7],[8],[12]       0              
Investment, Identifier [Axis]: Coupa Holdings, LLC | First lien - Undrawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       989              
Cost [7],[8],[12]       (12)              
Fair Value [7],[8],[12]       0              
Investment, Identifier [Axis]: Coupa Holdings, LLC | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[9],[17],[18] 14,135                    
Cost [3],[17],[18] 14,034                    
Fair Value [3],[17],[18] 14,135                    
Investment, Identifier [Axis]: Coupa Holdings, LLC | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[20] 1,288                    
Cost [3],[4],[20] 1,289                    
Fair Value [3],[4],[20] 1,288                    
Investment, Identifier [Axis]: Cronos Crimson Holdings, Inc. (f/k/a NMC Crimson Holdings, Inc.) | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 24,172 [3],[9],[17],[18]     24,172 [7],[11],[14],[15]              
Cost 24,079 [3],[17],[18]     24,034 [7],[14],[15]              
Fair Value 23,794 [3],[17],[18]     24,172 [7],[14],[15]              
Investment, Identifier [Axis]: Cronos Crimson Holdings, Inc. (f/k/a NMC Crimson Holdings, Inc.) | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 5,012 [3],[4],[9],[20]     5,012 [7],[8],[11],[16]              
Cost 5,004 [3],[4],[20]     5,001 [7],[8],[16]              
Fair Value 4,934 [3],[4],[20]     5,012 [7],[8],[16]              
Investment, Identifier [Axis]: Cronos Crimson Holdings, Inc. (f/k/a NMC Crimson Holdings, Inc.) | First lien 3                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 4,706 [3],[9],[17],[18]     4,706 [7],[11],[14],[15]              
Cost 4,693 [3],[17],[18]     4,687 [7],[14],[15]              
Fair Value 4,632 [3],[17],[18]     4,706 [7],[14],[15]              
Investment, Identifier [Axis]: DCA Buyer LLC | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[9],[17],[18] 962                    
Cost [3],[17],[18] 962                    
Fair Value [3],[17],[18] 962                    
Investment, Identifier [Axis]: DCA Buyer LLC | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[20] 539                    
Cost [3],[4],[20] 539                    
Fair Value [3],[4],[20] 539                    
Investment, Identifier [Axis]: DCA Investment Holding, LLC | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[11],[14],[15]       1,786              
Cost [7],[14],[15]       1,781              
Fair Value [7],[14],[15]       1,574              
Investment, Identifier [Axis]: DCA Investment Holding, LLC | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[16]       1,000              
Cost [7],[8],[16]       994              
Fair Value [7],[8],[16]       882              
Investment, Identifier [Axis]: DCA TopCo LP | Class A Common Units 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [3],[18] 617                    
Fair Value [3],[18] 617                    
Investment, Identifier [Axis]: DCA TopCo LP | Class A Common Units 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [3],[4] 345                    
Fair Value [3],[4] 345                    
Investment, Identifier [Axis]: DG Investment Intermediate Holdings 2, Inc. | Second lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[16]       9,512              
Cost [7],[8],[16]       9,466              
Fair Value [7],[8],[16]       9,464              
Investment, Identifier [Axis]: DOCS, MSO, LLC | First lien - Drawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[9],[13] 3,215                    
Cost [3],[13] 3,215                    
Fair Value [3],[13] 3,215                    
Investment, Identifier [Axis]: DOCS, MSO, LLC | First lien - Drawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[20] 1,587                    
Cost [3],[4],[20] 1,580                    
Fair Value [3],[4],[20] 1,587                    
Investment, Identifier [Axis]: DOCS, MSO, LLC | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 2,405 [3],[4],[9],[10]     2,405 [7],[8],[11],[12]              
Cost 0 [3],[4],[10]     0 [7],[8],[12]              
Fair Value 0 [3],[4],[10]     0 [7],[8],[12]              
Investment, Identifier [Axis]: DOCS, MSO, LLC | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[16]       18,149              
Cost [7],[8],[16]       18,149              
Fair Value [7],[8],[16]       18,149              
Investment, Identifier [Axis]: DOCS, MSO, LLC | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[11],[19]       6,797              
Cost [7],[19]       6,797              
Fair Value [7],[19]       6,797              
Investment, Identifier [Axis]: DOCS, MSO, LLC | First lien 3                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[16]       3,354              
Cost [7],[8],[16]       3,335              
Fair Value [7],[8],[16]       3,354              
Investment, Identifier [Axis]: DT1 Midco Corp | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[11],[14],[15]       1,342              
Cost [7],[14],[15]       1,335              
Fair Value [7],[14],[15]       1,335              
Investment, Identifier [Axis]: DT1 Midco Corp | First lien - Drawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       32              
Cost [7],[8],[12]       32              
Fair Value [7],[8],[12]       32              
Investment, Identifier [Axis]: DT1 Midco Corp | First lien - Undrawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       674              
Cost [7],[8],[12]       (3)              
Fair Value [7],[8],[12]       (3)              
Investment, Identifier [Axis]: DT1 Midco Corp | First lien - Undrawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       4,462              
Cost [7],[8],[12]       0              
Fair Value [7],[8],[12]       (22)              
Investment, Identifier [Axis]: DT1 Midco Corp. | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[9],[17],[18] 1,331                    
Cost [3],[17],[18] 1,326                    
Fair Value [3],[17],[18] 1,321                    
Investment, Identifier [Axis]: DT1 Midco Corp. | First lien - Drawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10] 2,625                    
Cost [3],[4],[10] 2,612                    
Fair Value [3],[4],[10] 2,605                    
Investment, Identifier [Axis]: DT1 Midco Corp. | First lien - Undrawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10] 674                    
Cost [3],[4],[10] (3)                    
Fair Value [3],[4],[10] (5)                    
Investment, Identifier [Axis]: DT1 Midco Corp. | First lien - Undrawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10] 1,869                    
Cost [3],[4],[10] 0                    
Fair Value [3],[4],[10] (14)                    
Investment, Identifier [Axis]: Daxko Acquisition Corporation | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 986 [3],[4],[9],[10]     986 [7],[8],[11],[12]              
Cost (10) [3],[4],[10]     (10) [7],[8],[12]              
Fair Value 0 [3],[4],[10]     0 [7],[8],[12]              
Investment, Identifier [Axis]: Daxko Acquisition Corporation | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 12,646 [3],[4],[9],[20]     12,746 [7],[8],[11],[16]              
Cost 12,602 [3],[4],[20]     12,686 [7],[8],[16]              
Fair Value 12,646 [3],[4],[20]     12,746 [7],[8],[16]              
Investment, Identifier [Axis]: Daxko Acquisition Corporation | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 1,066 [3],[9],[17],[18]     1,074 [7],[11],[14],[15]              
Cost 1,062 [3],[17],[18]     1,069 [7],[14],[15]              
Fair Value 1,066 [3],[17],[18]     1,074 [7],[14],[15]              
Investment, Identifier [Axis]: Daxko Acquisition Corporation | First lien 3                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 64 [3],[4],[9]     64 [7],[8],[11]              
Cost 63 [3],[4]     64 [7],[8]              
Fair Value 64 [3],[4]     64 [7],[8]              
Investment, Identifier [Axis]: Dealer Tire Holdings, LLC | Preferred Shares                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 27,116     90,671              
Cost [3],[4],[20],[26] 27,082                    
Fair Value [3],[4],[20],[26] 23,727                    
Investment, Identifier [Axis]: Dealer Tire Holdings, LLC | Preferred shares                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [7],[8],[16],[27]       81,859              
Fair Value [7],[8],[16],[27]       87,225              
Investment, Identifier [Axis]: Deca Dental Holdings LLC | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 37,413 [3],[9],[17],[18]     36,710 [7],[11],[14],[15]              
Cost 37,289 [3],[17],[18]     36,543 [7],[14],[15]              
Fair Value 31,801 [3],[17],[18]     35,715 [7],[14],[15]              
Investment, Identifier [Axis]: Deca Dental Holdings LLC | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 3,938 [3],[4],[9],[20]     3,864 [7],[8],[11],[16]              
Cost 3,925 [3],[4],[20]     3,846 [7],[8],[16]              
Fair Value 3,347 [3],[4],[20]     3,760 [7],[8],[16]              
Investment, Identifier [Axis]: Deca Dental Holdings LLC | First lien 3                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 3,101 [3],[4],[9],[20]     3,027 [7],[8],[11],[16]              
Cost 3,071 [3],[4],[20]     2,997 [7],[8],[16]              
Fair Value 2,636 [3],[4],[20]     2,945 [7],[8],[16]              
Investment, Identifier [Axis]: Deca Dental Holdings LLC | First lien 4                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[20] 1,156                    
Cost [3],[4],[20] 1,156                    
Fair Value [3],[4],[20] 1,156                    
Investment, Identifier [Axis]: Denali Intermediate Holdings, Inc. | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[11],[14],[15]       9,091              
Cost [7],[14],[15]       9,047              
Fair Value [7],[14],[15]       9,045              
Investment, Identifier [Axis]: Denali Intermediate Holdings, Inc. | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       909              
Cost [7],[8],[12]       (5)              
Fair Value [7],[8],[12]       (5)              
Investment, Identifier [Axis]: Digicert, Inc. | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 15,345 [3],[9],[17],[18]     15,462 [7],[11],[14],[15]              
Cost 15,253 [3],[17],[18]     15,354 [7],[14],[15]              
Fair Value 15,345 [3],[17],[18]     15,346 [7],[14],[15]              
Investment, Identifier [Axis]: Digicert, Inc. | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 1,119 [3],[4],[9],[10]     1,119 [7],[8],[11],[12]              
Cost (8) [3],[4],[10]     (8) [7],[8],[12]              
Fair Value 0 [3],[4],[10]     (8) [7],[8],[12]              
Investment, Identifier [Axis]: Diligent Corporation | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[20] 3,505                    
Cost [3],[4],[20] 3,496                    
Fair Value [3],[4],[20] 3,391                    
Investment, Identifier [Axis]: Diligent Corporation | First lien - Drawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 1,178 [3],[4],[9],[10]     532 [7],[8],[11],[12]              
Cost 1,174 [3],[4],[10]     530 [7],[8],[12]              
Fair Value 1,140 [3],[4],[10]     532 [7],[8],[12]              
Investment, Identifier [Axis]: Diligent Corporation | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10] 1,087                    
Cost [3],[4],[10] (4)                    
Fair Value [3],[4],[10] (35)                    
Investment, Identifier [Axis]: Diligent Corporation | First lien - Undrawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       1,733              
Cost [7],[8],[12]       (6)              
Fair Value [7],[8],[12]       0              
Investment, Identifier [Axis]: Diligent Corporation | First lien - Undrawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       3,398              
Cost [7],[8],[12]       (13)              
Fair Value [7],[8],[12]       0              
Investment, Identifier [Axis]: Diligent Corporation | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[11],[14],[15]       19,821              
Cost [7],[14],[15]       19,763              
Fair Value [7],[14],[15]       19,821              
Investment, Identifier [Axis]: Diligent Corporation | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[16]       3,398              
Cost [7],[8],[16]       3,388              
Fair Value [7],[8],[16]       3,398              
Investment, Identifier [Axis]: Diligent Preferred Issuer, Inc. | Preferred shares                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount       15,827              
Cost [7],[8],[28]       15,702              
Fair Value [7],[8],[28]       15,036              
Investment, Identifier [Axis]: Eagle Infrastructure Services, LLC (fka FR Arsenal Holdings II Corp.) / Eagle Infrastructure Super HoldCo, LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Fair Value 22,648     18,337     $ 19,156        
Investment, Identifier [Axis]: Eagle Infrastructure Services, LLC (fka FR Arsenal Holdings II Corp.) | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 10,628 [3],[9],[17],[18],[29]     10,628 [7],[11],[14],[15],[30]              
Cost 10,628 [3],[17],[18],[29]     10,628 [7],[14],[15],[30]              
Fair Value 10,628 [3],[17],[18],[29]     10,628 [7],[14],[15],[30]              
Investment, Identifier [Axis]: Eagle Infrastructure Services, LLC (fka FR Arsenal Holdings II Corp.) | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 340 [3],[4],[9],[29]     340 [7],[8],[11],[30]              
Cost 340 [3],[4],[29]     340 [7],[8],[30]              
Fair Value 340 [3],[4],[29]     340 [7],[8],[30]              
Investment, Identifier [Axis]: Eagle Infrastructure Super HoldCo, LLC | Ordinary Shares                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [3],[4],[29] 4,103                    
Fair Value [3],[4],[29] 11,680                    
Investment, Identifier [Axis]: Eagle Infrastructure Super HoldCo, LLC | Ordinary shares                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [7],[8],[30]       4,104              
Fair Value [7],[8],[30]       7,369              
Investment, Identifier [Axis]: Eclipse Buyer Inc. | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 7,113 [3],[9],[13],[31]     7,113 [7],[11],[19],[32]              
Cost 7,086 [3],[13],[31]     7,082 [7],[19],[32]              
Fair Value 7,007 [3],[13],[31]     7,113 [7],[19],[32]              
Investment, Identifier [Axis]: Eclipse Buyer Inc. | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10],[31] 4,190                    
Cost [3],[4],[10],[31] (21)                    
Fair Value [3],[4],[10],[31] (62)                    
Investment, Identifier [Axis]: Eclipse Buyer Inc. | First lien - Undrawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[11],[12],[19]       1,206              
Cost [7],[12],[19]       0              
Fair Value [7],[12],[19]       0              
Investment, Identifier [Axis]: Eclipse Buyer Inc. | First lien - Undrawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       4,190              
Cost [7],[8],[12]       (21)              
Fair Value [7],[8],[12]       0              
Investment, Identifier [Axis]: Eclipse Topco Holdings, Inc. (fka Transcendia Holdings, Inc.) | Ordinary Shares                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [3],[4] 145                    
Fair Value [3],[4] 41                    
Investment, Identifier [Axis]: Eclipse Topco Holdings, Inc. (fka Transcendia Holdings, Inc.) | Ordinary shares                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [7],[8]       145              
Fair Value [7],[8]       0              
Investment, Identifier [Axis]: Eclipse Topco Holdings, Inc. (fka Transcendia Holdings, Inc.) | Series A Preferred Shares                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [3],[4] 3,835                    
Fair Value [3],[4] 3,835                    
Investment, Identifier [Axis]: Eclipse Topco Holdings, Inc. (fka Transcendia Holdings, Inc.) | Series A preferred shares                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 3,835     3,335              
Cost [7],[8]       3,335              
Fair Value [7],[8]       3,335              
Investment, Identifier [Axis]: Eclipse Topco Holdings, Inc. (fka Transcendia Holdings, Inc.) | Series B Preferred Shares                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [3],[4] 2,565                    
Fair Value [3],[4] 3,068                    
Investment, Identifier [Axis]: Eclipse Topco Holdings, Inc. (fka Transcendia Holdings, Inc.) | Series B preferred shares                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 3,691     4,116              
Cost [7],[8]       2,565              
Fair Value [7],[8]       3,009              
Investment, Identifier [Axis]: Eclipse Topco, Inc. | Preferred Shares                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [3],[13],[31] 1,620                    
Fair Value [3],[13],[31] 1,616                    
Investment, Identifier [Axis]: Eclipse Topco, Inc. | Preferred shares                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 1,632     2,226              
Cost [7],[19],[32]       2,207              
Fair Value [7],[19],[32]       2,228              
Investment, Identifier [Axis]: Edmentum Ultimate Holdings, LLC | Subordinated                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 30,418 [3],[4],[9],[29],[33]     26,646 [7],[8],[11],[30],[34]              
Cost 30,383 [3],[4],[29],[33]     26,596 [7],[8],[30],[34]              
Fair Value 30,418 [3],[4],[29],[33]     26,646 [7],[8],[30],[34]              
Investment, Identifier [Axis]: Einstein Parent, Inc. | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 5,750 [3],[4],[9],[10]     5,750 [7],[8],[11],[12]              
Cost (57) [3],[4],[10]     (57) [7],[8],[12]              
Fair Value (129) [3],[4],[10]     (57) [7],[8],[12]              
Investment, Identifier [Axis]: Einstein Parent, Inc. | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 35,582 [3],[4],[9],[20]     35,582 [7],[8],[11],[16]              
Cost 35,308 [3],[4],[20]     35,292 [7],[8],[16]              
Fair Value 34,782 [3],[4],[20]     35,226 [7],[8],[16]              
Investment, Identifier [Axis]: Einstein Parent, Inc. | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 20,000 [3],[9],[17],[18]     20,000 [7],[11],[14],[15]              
Cost 19,845 [3],[17],[18]     19,800 [7],[14],[15]              
Fair Value 19,550 [3],[17],[18]     19,800 [7],[14],[15]              
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC | First lien - Drawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10],[20] 158                    
Cost [3],[4],[10],[20] 156                    
Fair Value [3],[4],[10],[20] 158                    
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC | First lien - Drawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[11],[12],[25]       2,533              
Cost [7],[12],[25]       2,508              
Fair Value [7],[12],[25]       2,533              
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10] 1,243                    
Cost [3],[4],[10] (12)                    
Fair Value [3],[4],[10] 0                    
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC | First lien - Undrawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       64              
Cost [7],[8],[12]       0              
Fair Value [7],[8],[12]       0              
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC | First lien - Undrawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[11],[12],[25]       191              
Cost [7],[12],[25]       0              
Fair Value [7],[12],[25]       0              
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC | First lien - Undrawn 3                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       1,400              
Cost [7],[8],[12]       (14)              
Fair Value [7],[8],[12]       0              
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 8,370 [3],[9],[24]     8,449 [7],[11],[25]              
Cost 8,338 [3],[24]     8,410 [7],[25]              
Fair Value 8,370 [3],[24]     8,449 [7],[25]              
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 4,667 [3],[4],[9],[20]     4,710 [7],[8],[11],[16]              
Cost 4,644 [3],[4],[20]     4,682 [7],[8],[16]              
Fair Value 4,667 [3],[4],[20]     4,710 [7],[8],[16]              
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC | First lien 3                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 2,810 [3],[9],[24]     2,836 [7],[11],[25]              
Cost 2,798 [3],[24]     2,822 [7],[25]              
Fair Value 2,810 [3],[24]     2,836 [7],[25]              
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC | First lien 4                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 2,792 [3],[9],[24]     2,818 [7],[11],[25]              
Cost 2,781 [3],[24]     2,805 [7],[25]              
Fair Value 2,792 [3],[24]     2,818 [7],[25]              
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC | First lien 5                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[9],[24] 2,704                    
Cost [3],[24] 2,682                    
Fair Value [3],[24] 2,704                    
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC | First lien 6                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[20] 903                    
Cost [3],[4],[20] 895                    
Fair Value [3],[4],[20] 903                    
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC | First lien- Drawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12],[16]       846              
Cost [7],[8],[12],[16]       837              
Fair Value [7],[8],[12],[16]       846              
Investment, Identifier [Axis]: FS WhiteWater Holdings, LLC | Ordinary Shares                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [3],[24],[35] 5,000                    
Fair Value [3],[24],[35] 6,117                    
Investment, Identifier [Axis]: FS WhiteWater Holdings, LLC | Ordinary shares                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [7],[25],[36]       5,000              
Fair Value [7],[25],[36]       5,357              
Investment, Identifier [Axis]: Firebird Acquisition Corp, Inc. | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 8,299 [3],[4],[9],[20]     8,187 [7],[8],[11],[16]              
Cost 8,282 [3],[4],[20]     8,169 [7],[8],[16]              
Fair Value 8,299 [3],[4],[20]     8,167 [7],[8],[16]              
Investment, Identifier [Axis]: Firebird Acquisition Corp, Inc. | First lien - Drawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 3,208 [3],[4],[9],[10]     1,919 [7],[8],[11],[12]              
Cost 3,201 [3],[4],[10]     1,914 [7],[8],[12]              
Fair Value 3,208 [3],[4],[10]     1,914 [7],[8],[12]              
Investment, Identifier [Axis]: Firebird Acquisition Corp, Inc. | First lien - Undrawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       1,422              
Cost [7],[8],[12]       (4)              
Fair Value [7],[8],[12]       (4)              
Investment, Identifier [Axis]: Firebird Acquisition Corp, Inc. | First lien - Undrawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 1,422 [3],[4],[9],[10]     2,814 [7],[8],[11],[12]              
Cost (4) [3],[4],[10]     0 [7],[8],[12]              
Fair Value 0 [3],[4],[10]     (7) [7],[8],[12]              
Investment, Identifier [Axis]: Firebird Acquisition Corp, Inc. | First lien - Undrawn1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10] 1,504                    
Cost [3],[4],[10] 0                    
Fair Value [3],[4],[10] 0                    
Investment, Identifier [Axis]: Firebird Co-Invest L.P. | LP Interest                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost 3,358 [3],[4],[37]     3,358 [7],[8],[38]              
Fair Value 4,350 [3],[4],[37]     3,358 [7],[8],[38]              
Investment, Identifier [Axis]: Flash Charm Inc. (fka Idera, Inc.) | Second lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [11],[19]       6,474              
Cost [19]       6,463              
Fair Value [19]       5,697              
Investment, Identifier [Axis]: Flash Charm Inc. (fka Idera, Inc.) | Second lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [8],[11],[16]       863              
Cost [8],[16]       862              
Fair Value [8],[16]       760              
Investment, Identifier [Axis]: Foreside Financial Group, LLC | First lien - Drawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       460              
Cost [7],[8],[12]       457              
Fair Value [7],[8],[12]       460              
Investment, Identifier [Axis]: Foreside Financial Group, LLC | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10] 2,311                    
Cost [3],[4],[10] (23)                    
Fair Value [3],[4],[10] (12)                    
Investment, Identifier [Axis]: Foreside Financial Group, LLC | First lien - Undrawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       2,849              
Cost [7],[8],[12]       0              
Fair Value [7],[8],[12]       0              
Investment, Identifier [Axis]: Foreside Financial Group, LLC | First lien - Undrawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       2,311              
Cost [7],[8],[12]       (21)              
Fair Value [7],[8],[12]       0              
Investment, Identifier [Axis]: Foreside Financial Group, LLC | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 7,726 [3],[9],[17],[18]     36,810 [7],[11],[14],[15]              
Cost 7,716 [3],[17],[18]     36,683 [7],[14],[15]              
Fair Value 7,688 [3],[17],[18]     36,810 [7],[14],[15]              
Investment, Identifier [Axis]: Foreside Financial Group, LLC | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 272 [3],[4],[9],[20]     4,033 [7],[8],[11],[16]              
Cost 271 [3],[4],[20]     4,012 [7],[8],[16]              
Fair Value 271 [3],[4],[20]     4,033 [7],[8],[16]              
Investment, Identifier [Axis]: Fortis Solutions Group, LLC | First lien - Drawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 2,014 [3],[4],[9],[10],[20]     834 [7],[8],[11],[12],[16]              
Cost 1,994 [3],[4],[10],[20]     826 [7],[8],[12],[16]              
Fair Value 2,014 [3],[4],[10],[20]     834 [7],[8],[12],[16]              
Investment, Identifier [Axis]: Fortis Solutions Group, LLC | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 846 [3],[4],[9],[10]     2,026 [7],[8],[11],[12]              
Cost (8) [3],[4],[10]     (20) [7],[8],[12]              
Fair Value 0 [3],[4],[10]     0 [7],[8],[12]              
Investment, Identifier [Axis]: Fortis Solutions Group, LLC | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 29,006 [3],[9],[17],[18]     29,234 [7],[11],[14],[15]              
Cost 28,900 [3],[17],[18]     29,095 [7],[14],[15]              
Fair Value 29,006 [3],[17],[18]     29,234 [7],[14],[15]              
Investment, Identifier [Axis]: Fortis Solutions Group, LLC | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 965 [3],[4],[9],[20]     972 [7],[8],[11],[16]              
Cost 968 [3],[4],[20]     974 [7],[8],[16]              
Fair Value 965 [3],[4],[20]     972 [7],[8],[16]              
Investment, Identifier [Axis]: Fortis Solutions Group, LLC | First lien 3                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 78 [3],[4],[9]     79 [7],[8],[11]              
Cost 78 [3],[4]     78 [7],[8]              
Fair Value 78 [3],[4]     79 [7],[8]              
Investment, Identifier [Axis]: Foundational Education Group, Inc. | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 6,301 [9],[17],[18]     6,350 [11],[14],[15]              
Cost 5,947 [17],[18]     5,871 [14],[15]              
Fair Value 5,885 [17],[18]     5,871 [14],[15]              
Investment, Identifier [Axis]: Foundational Education Group, Inc. | Second lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 22,500 [3],[9],[24]     22,500 [7],[11],[25]              
Cost 22,447 [3],[24]     22,436 [7],[25]              
Fair Value 22,500 [3],[24]     22,500 [7],[25]              
Investment, Identifier [Axis]: Foundational Education Group, Inc. | Second lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 10,965 [3],[4],[9],[20]     10,965 [7],[8],[11],[16]              
Cost 10,791 [3],[4],[20]     10,754 [7],[8],[16]              
Fair Value 10,965 [3],[4],[20]     10,965 [7],[8],[16]              
Investment, Identifier [Axis]: Fullsteam Operations LLC | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 6,223 [3],[9],[17],[18]     6,223 [7],[11],[14],[15]              
Cost 6,197 [3],[17],[18]     6,193 [7],[14],[15]              
Fair Value 6,192 [3],[17],[18]     6,192 [7],[14],[15]              
Investment, Identifier [Axis]: Fullsteam Operations LLC | First lien - Drawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10],[20] 377                    
Cost [3],[4],[10],[20] 375                    
Fair Value [3],[4],[10],[20] 375                    
Investment, Identifier [Axis]: Fullsteam Operations LLC | First lien - Undrawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 691 [3],[4],[9],[10]     691 [7],[8],[11],[12]              
Cost (3) [3],[4],[10]     (3) [7],[8],[12]              
Fair Value (3) [3],[4],[10]     (3) [7],[8],[12]              
Investment, Identifier [Axis]: Fullsteam Operations LLC | First lien - Undrawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 1,698 [3],[4],[9],[10]     2,074 [7],[8],[11],[12]              
Cost 0 [3],[4],[10]     0 [7],[8],[12]              
Fair Value (8) [3],[4],[10]     (10) [7],[8],[12]              
Investment, Identifier [Axis]: GC Waves Holdings, Inc. | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [9],[24] 21,072                    
Cost [24] 21,027                    
Fair Value [24] 21,072                    
Investment, Identifier [Axis]: GC Waves Holdings, Inc. | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 3,951 [4],[9],[10]     3,951 [7],[8],[11],[12]              
Cost (30) [4],[10]     (30) [7],[8],[12]              
Fair Value 0 [4],[10]     0 [7],[8],[12]              
Investment, Identifier [Axis]: GC Waves Holdings, Inc. | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[11],[14],[15]       35,918              
Cost [7],[14],[15]       35,742              
Fair Value [7],[14],[15]       35,918              
Investment, Identifier [Axis]: GC Waves Holdings, Inc. | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[11],[25]       21,233              
Cost [7],[25]       21,180              
Fair Value [7],[25]       21,233              
Investment, Identifier [Axis]: GEDC Equity, LLC | Participation Interest                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost 190 [3],[4]     190 [7],[8]              
Fair Value 0 [3],[4]     50 [7],[8]              
Investment, Identifier [Axis]: GS Acquisitionco, Inc. | First lien - Drawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10] 4,818                    
Cost [3],[4],[10] 4,793                    
Fair Value [3],[4],[10] 4,213                    
Investment, Identifier [Axis]: GS Acquisitionco, Inc. | First lien - Drawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       1,786              
Cost [7],[8],[12]       1,779              
Fair Value [7],[8],[12]       1,786              
Investment, Identifier [Axis]: GS Acquisitionco, Inc. | First lien - Drawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       448              
Cost [7],[8],[12]       446              
Fair Value [7],[8],[12]       448              
Investment, Identifier [Axis]: GS Acquisitionco, Inc. | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10] 3                    
Cost [3],[4],[10] 0                    
Fair Value [3],[4],[10] (1)                    
Investment, Identifier [Axis]: GS Acquisitionco, Inc. | First lien - Undrawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       759              
Cost [7],[8],[12]       0              
Fair Value [7],[8],[12]       0              
Investment, Identifier [Axis]: GS Acquisitionco, Inc. | First lien - Undrawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       3,036              
Cost [7],[8],[12]       (19)              
Fair Value [7],[8],[12]       0              
Investment, Identifier [Axis]: GS Acquisitionco, Inc. | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 20,906 [3],[9],[24]     25,079 [7],[11],[14],[15]              
Cost 20,888 [3],[24]     25,049 [7],[14],[15]              
Fair Value 18,280 [3],[24]     25,079 [7],[14],[15]              
Investment, Identifier [Axis]: GS Acquisitionco, Inc. | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 445 [3],[4],[9]     21,074 [7],[11],[25]              
Cost 442 [3],[4]     21,048 [7],[25]              
Fair Value 389 [3],[4]     21,074 [7],[25]              
Investment, Identifier [Axis]: GS Acquisitionco, Inc. | First lien 3                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[16]       2,878              
Cost [7],[8],[16]       2,874              
Fair Value [7],[8],[16]       2,878              
Investment, Identifier [Axis]: Greenway Health, LLC | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 6,190 [3],[4],[9],[20]     6,238 [7],[8],[11],[16]              
Cost 6,140 [3],[4],[20]     6,175 [7],[8],[16]              
Fair Value 6,033 [3],[4],[20]     6,238 [7],[8],[16]              
Investment, Identifier [Axis]: HBWM Holdings, LLC | Common Units                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [3],[39],[40] 4,827                    
Fair Value [3],[39],[40] 11,659                    
Investment, Identifier [Axis]: HBWM Holdings, LLC | Common units                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 4,827     4,776              
Cost [7],[41],[42]       4,776              
Fair Value [7],[41],[42]       10,854              
Investment, Identifier [Axis]: HP TLE Buyer, Inc. | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 8,168 [3],[9],[17],[18]     8,168 [7],[11],[14],[15]              
Cost 8,132 [3],[17],[18]     8,129 [7],[14],[15]              
Fair Value 8,168 [3],[17],[18]     8,127 [7],[14],[15]              
Investment, Identifier [Axis]: HP TLE Buyer, Inc. | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 1,797 [3],[4],[9],[10]     1,797 [7],[8],[11],[12]              
Cost (9) [3],[4],[10]     (9) [7],[8],[12]              
Fair Value 0 [3],[4],[10]     (9) [7],[8],[12]              
Investment, Identifier [Axis]: HS Purchaser, LLC / Help/Systems Holdings, Inc. | Second lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 25,426 [3],[9],[24]     23,738 [7],[11],[25]              
Cost 25,381 [3],[24]     23,683 [7],[25]              
Fair Value 15,637 [3],[24]     19,640 [7],[25]              
Investment, Identifier [Axis]: HS Purchaser, LLC / Help/Systems Holdings, Inc. | Second lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 4,755 [3],[9],[18]     4,440 [7],[11],[14],[15]              
Cost 4,740 [3],[18]     4,421 [7],[14],[15]              
Fair Value 2,924 [3],[18]     3,673 [7],[14],[15]              
Investment, Identifier [Axis]: Healthspan Buyer, LLC | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[16]       5,018              
Cost [7],[8],[16]       4,980              
Fair Value [7],[8],[16]       5,018              
Investment, Identifier [Axis]: Healthspan Buyer, LLC | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 1,229 [4],[9],[10]     1,229 [7],[8],[11],[12]              
Cost (12) [4],[10]     (12) [7],[8],[12]              
Fair Value 0 [4],[10]     0 [7],[8],[12]              
Investment, Identifier [Axis]: Healthspan Buyer, LLC | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [9],[17],[18] 32,239                    
Cost [17],[18] 31,936                    
Fair Value [17],[18] 32,239                    
Investment, Identifier [Axis]: Healthspan Buyer, LLC | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [4],[9],[20] 4,980                    
Cost [4],[20] 4,947                    
Fair Value [4],[20] 4,980                    
Investment, Identifier [Axis]: Houghton Mifflin Harcourt Company | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 14,225 [9],[17],[18]     14,336 [11],[14],[15]              
Cost 13,988 [17],[18]     14,044 [14],[15]              
Fair Value 9,691 [17],[18]     12,689 [14],[15]              
Investment, Identifier [Axis]: ICAT Intermediate Holdings, LLC | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10] 220                    
Cost [3],[4],[10] (2)                    
Fair Value [3],[4],[10] (2)                    
Investment, Identifier [Axis]: ICAT Intermediate Holdings, LLC | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[9],[17],[18] 3,587                    
Cost [3],[17],[18] 3,554                    
Fair Value [3],[17],[18] 3,552                    
Investment, Identifier [Axis]: ICAT Intermediate Holdings, LLC | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[20] 958                    
Cost [3],[4],[20] 948                    
Fair Value [3],[4],[20] 948                    
Investment, Identifier [Axis]: ICAT Intermediate Holdings, LLC | First lien 3                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[20] 516                    
Cost [3],[4],[20] 511                    
Fair Value [3],[4],[20] 511                    
Investment, Identifier [Axis]: IG Investments Holdings, LLC | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 3,780 [3],[4],[9],[10]     3,780 [7],[8],[11],[12]              
Cost (38) [3],[4],[10]     (38) [7],[8],[12]              
Fair Value 0 [3],[4],[10]     0 [7],[8],[12]              
Investment, Identifier [Axis]: IG Investments Holdings, LLC | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 32,225 [3],[9],[17],[18]     32,471 [7],[11],[14],[15]              
Cost 32,121 [3],[17],[18]     32,329 [7],[14],[15]              
Fair Value 32,225 [3],[17],[18]     32,471 [7],[14],[15]              
Investment, Identifier [Axis]: IG Investments Holdings, LLC | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 2,498 [3],[4],[9],[20]     2,517 [7],[8],[11],[16]              
Cost 2,500 [3],[4],[20]     2,517 [7],[8],[16]              
Fair Value 2,498 [3],[4],[20]     2,517 [7],[8],[16]              
Investment, Identifier [Axis]: IMA Financial Group, Inc. | Class C Common Shares                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [3],[4] 4,411                    
Fair Value [3],[4] 4,411                    
Investment, Identifier [Axis]: Icefall Parent, Inc. | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[20] 4,828                    
Cost [3],[4],[20] 4,672                    
Fair Value [3],[4],[20] 4,828                    
Investment, Identifier [Axis]: Icefall Parent, Inc. | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10] 475                    
Cost [3],[4],[10] (17)                    
Fair Value [3],[4],[10] 0                    
Investment, Identifier [Axis]: Infogain Corporation | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 3,757 [3],[4],[9],[10]     3,827 [7],[8],[11],[12]              
Cost (28) [3],[4],[10]     (29) [7],[8],[12]              
Fair Value 0 [3],[4],[10]     0 [7],[8],[12]              
Investment, Identifier [Axis]: Infogain Corporation | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 7,625 [3],[9],[17],[18]     18,324 [7],[11],[14],[15]              
Cost 7,598 [3],[17],[18]     18,263 [7],[14],[15]              
Fair Value 7,625 [3],[17],[18]     18,324 [7],[14],[15]              
Investment, Identifier [Axis]: Infogain Corporation | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 70 [3],[4],[9],[10]     7,685 [7],[11],[14],[15]              
Cost 70 [3],[4],[10]     7,647 [7],[14],[15]              
Fair Value 70 [3],[4],[10]     7,685 [7],[14],[15]              
Investment, Identifier [Axis]: Infogain Corporation | Subordinated                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 6,265 [3],[4],[9]     16,661 [7],[8],[11]              
Cost 6,226 [3],[4]     16,534 [7],[8]              
Fair Value 6,265 [3],[4]     16,661 [7],[8]              
Investment, Identifier [Axis]: Ivy Hill Middle Market Credit Fund, Ltd | Structured Finance Obligation                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 3,232 [3],[4],[9],[23]     3,232 [7],[8],[11],[22]              
Cost 3,232 [3],[4],[23]     3,232 [7],[8],[22]              
Fair Value 3,217 [3],[4],[23]     3,277 [7],[8],[22]              
Investment, Identifier [Axis]: Jawbreaker Parent, Inc. | First lien - Undrawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10] 1,503                    
Cost [3],[4],[10] 0                    
Fair Value [3],[4],[10] (8)                    
Investment, Identifier [Axis]: Jawbreaker Parent, Inc. | First lien - Undrawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10] 1,503                    
Cost [3],[4],[10] (8)                    
Fair Value [3],[4],[10] (8)                    
Investment, Identifier [Axis]: Jawbreaker Parent, Inc. | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[9],[17],[18] 7,777                    
Cost [3],[17],[18] 7,740                    
Fair Value [3],[17],[18] 7,738                    
Investment, Identifier [Axis]: Jawbreaker Parent, Inc. | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[20] 3,718                    
Cost [3],[4],[20] 3,718                    
Fair Value [3],[4],[20] 3,700                    
Investment, Identifier [Axis]: Jawbreaker Topco, L.P. | Class A-1 Common Units                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [3],[4],[43] 2,476                    
Fair Value [3],[4],[43] 2,476                    
Investment, Identifier [Axis]: KPSKY Acquisition Inc. | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 6,703 [3],[4],[9],[20]     6,756 [7],[8],[11],[16]              
Cost 6,680 [3],[4],[20]     6,724 [7],[8],[16]              
Fair Value 6,140 [3],[4],[20]     6,331 [7],[8],[16]              
Investment, Identifier [Axis]: KPSKY Acquisition Inc. | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 1,128 [3],[4],[9],[20]     1,137 [7],[8],[11],[16]              
Cost 1,123 [3],[4],[20]     1,130 [7],[8],[16]              
Fair Value 1,033 [3],[4],[20]     1,066 [7],[8],[16]              
Investment, Identifier [Axis]: KPSKY Acquisition Inc. | First lien 3                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 768 [3],[4],[9],[20]     774 [7],[8],[11],[16]              
Cost 765 [3],[4],[20]     770 [7],[8],[16]              
Fair Value 703 [3],[4],[20]     726 [7],[8],[16]              
Investment, Identifier [Axis]: KPSKY Acquisition Inc. | First lien 4                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 18 [3],[4],[9]     19 [7],[8],[11]              
Cost 18 [3],[4]     18 [7],[8]              
Fair Value 17 [3],[4]     18 [7],[8]              
Investment, Identifier [Axis]: Kele Holdco, Inc. | First lien - Drawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 540 [3],[4],[9],[10],[20]     270 [7],[8],[11],[12],[16]              
Cost 537 [3],[4],[10],[20]     269 [7],[8],[12],[16]              
Fair Value 540 [3],[4],[10],[20]     270 [7],[8],[12],[16]              
Investment, Identifier [Axis]: Kele Holdco, Inc. | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 1,259 [3],[4],[9],[10]     1,529 [7],[8],[11],[12]              
Cost (6) [3],[4],[10]     (8) [7],[8],[12]              
Fair Value 0 [3],[4],[10]     0 [7],[8],[12]              
Investment, Identifier [Axis]: Kele Holdco, Inc. | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 14,352 [3],[9],[24]     14,473 [7],[11],[25]              
Cost 14,343 [3],[24]     14,461 [7],[25]              
Fair Value 14,352 [3],[24]     14,473 [7],[25]              
Investment, Identifier [Axis]: Kele Holdco, Inc. | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 1,109 [3],[9],[24]     1,241 [7],[11],[25]              
Cost 1,106 [3],[24]     1,236 [7],[25]              
Fair Value 1,109 [3],[24]     1,241 [7],[25]              
Investment, Identifier [Axis]: Knockout Intermediate Holdings I Inc. | Preferred Shares                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [3],[4],[44] 14,203                    
Fair Value [3],[4],[44] 9,674                    
Investment, Identifier [Axis]: Knockout Intermediate Holdings I Inc. | Preferred shares                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 14,279     13,323              
Cost [7],[8],[45]       13,248              
Fair Value [7],[8],[45]       13,324              
Investment, Identifier [Axis]: Legends Hospitality Holding Company, LLC | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[11],[25]       6,250              
Cost [7],[25]       6,198              
Fair Value [7],[25]       6,250              
Investment, Identifier [Axis]: Legends Hospitality Holding Company, LLC | First lien - Drawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10] 179                    
Cost [3],[4],[10] 177                    
Fair Value [3],[4],[10] 174                    
Investment, Identifier [Axis]: Legends Hospitality Holding Company, LLC | First lien - Drawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[11],[12],[25]       296              
Cost [7],[12],[25]       293              
Fair Value [7],[12],[25]       296              
Investment, Identifier [Axis]: Legends Hospitality Holding Company, LLC | First lien - Drawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       233              
Cost [7],[8],[12]       230              
Fair Value [7],[8],[12]       233              
Investment, Identifier [Axis]: Legends Hospitality Holding Company, LLC | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10] 537                    
Cost [3],[4],[10] (5)                    
Fair Value [3],[4],[10] (13)                    
Investment, Identifier [Axis]: Legends Hospitality Holding Company, LLC | First lien - Undrawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[11],[12],[25]       61              
Cost [7],[12],[25]       0              
Fair Value [7],[12],[25]       0              
Investment, Identifier [Axis]: Legends Hospitality Holding Company, LLC | First lien - Undrawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       483              
Cost [7],[8],[12]       (5)              
Fair Value [7],[8],[12]       0              
Investment, Identifier [Axis]: Legends Hospitality Holding Company, LLC | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[9],[24] 6,310                    
Cost [3],[24] 6,264                    
Fair Value [3],[24] 6,215                    
Investment, Identifier [Axis]: Legends Hospitality Holding Company, LLC | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[9],[24] 354                    
Cost [3],[24] 351                    
Fair Value [3],[24] 345                    
Investment, Identifier [Axis]: LogRhythm, Inc. | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9] 4,231                    
Cost [3],[4] 4,189                    
Fair Value [3],[4] 3,454                    
Investment, Identifier [Axis]: LogRhythm, Inc. | First lien - Drawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10],[20] 73                    
Cost [3],[4],[10],[20] 72                    
Fair Value [3],[4],[10],[20] 73                    
Investment, Identifier [Axis]: LogRhythm, Inc. | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10] 346                    
Cost [3],[4],[10] (5)                    
Fair Value [3],[4],[10] 0                    
Investment, Identifier [Axis]: Logrhythm, Inc. | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11]       4,196              
Cost [7],[8]       4,148              
Fair Value [7],[8]       3,994              
Investment, Identifier [Axis]: Logrhythm, Inc. | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       420              
Cost [7],[8],[12]       (6)              
Fair Value [7],[8],[12]       (20)              
Investment, Identifier [Axis]: Low Voltage Holdings Inc. | First lien - Drawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10] 898                    
Cost [3],[4],[10] 895                    
Fair Value [3],[4],[10] 898                    
Investment, Identifier [Axis]: Low Voltage Holdings Inc. | First lien - Undrawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 2,738 [3],[4],[9],[10]     819 [7],[8],[11],[12]              
Cost 0 [3],[4],[10]     (3) [7],[8],[12]              
Fair Value 0 [3],[4],[10]     (3) [7],[8],[12]              
Investment, Identifier [Axis]: Low Voltage Holdings Inc. | First lien - Undrawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 819 [3],[4],[9],[10]     2,317 [7],[8],[11],[12]              
Cost (3) [3],[4],[10]     (9) [7],[8],[12]              
Fair Value 0 [3],[4],[10]     (9) [7],[8],[12]              
Investment, Identifier [Axis]: Low Voltage Holdings Inc. | First lien - Undrawn 3                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 1,419 [3],[4],[9],[10]     3,698 [7],[8],[11],[12]              
Cost (5) [3],[4],[10]     0 [7],[8],[12]              
Fair Value 0 [3],[4],[10]     (14) [7],[8],[12]              
Investment, Identifier [Axis]: Low Voltage Holdings Inc. | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 18,368 [3],[9],[17],[18]     17,038 [7],[11],[14],[15]              
Cost 18,311 [3],[17],[18]     16,979 [7],[14],[15]              
Fair Value 18,368 [3],[17],[18]     16,975 [7],[14],[15]              
Investment, Identifier [Axis]: Low Voltage Holdings Inc. | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 955 [3],[4],[9],[20]     1,422 [7],[8],[11],[16]              
Cost 953 [3],[4],[20]     1,417 [7],[8],[16]              
Fair Value 955 [3],[4],[20]     1,417 [7],[8],[16]              
Investment, Identifier [Axis]: MRI Software LLC | First lien - Drawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 501 [3],[4],[9],[10]     400 [7],[8],[11],[12]              
Cost 498 [3],[4],[10]     398 [7],[8],[12]              
Fair Value 493 [3],[4],[10]     400 [7],[8],[12]              
Investment, Identifier [Axis]: MRI Software LLC | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 1,502 [3],[4],[9],[10]     1,602 [7],[8],[11],[12]              
Cost (8) [3],[4],[10]     (8) [7],[8],[12]              
Fair Value (23) [3],[4],[10]     0 [7],[8],[12]              
Investment, Identifier [Axis]: MRI Software LLC | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 21,036 [3],[9],[24]     21,205 [7],[11],[25]              
Cost 21,021 [3],[24]     21,183 [7],[25]              
Fair Value 20,721 [3],[24]     21,205 [7],[25]              
Investment, Identifier [Axis]: MRI Software LLC | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 7,453 [3],[4],[9],[20]     7,512 [7],[8],[11],[16]              
Cost 7,451 [3],[4],[20]     7,506 [7],[8],[16]              
Fair Value 7,341 [3],[4],[20]     7,512 [7],[8],[16]              
Investment, Identifier [Axis]: MRI Software LLC | First lien 3                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 4,439 [3],[9],[17],[18]     4,474 [7],[11],[14],[15]              
Cost 4,438 [3],[17],[18]     4,471 [7],[14],[15]              
Fair Value 4,372 [3],[17],[18]     4,474 [7],[14],[15]              
Investment, Identifier [Axis]: MRI Software LLC | First lien 4                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 3,050 [3],[9],[17],[18]     3,075 [7],[11],[14],[15]              
Cost 3,049 [3],[17],[18]     3,072 [7],[14],[15]              
Fair Value 3,005 [3],[17],[18]     3,075 [7],[14],[15]              
Investment, Identifier [Axis]: MRI Software LLC | First lien 5                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 779 [3],[4],[9],[20]     785 [7],[8],[11],[16]              
Cost 778 [3],[4],[20]     784 [7],[8],[16]              
Fair Value 767 [3],[4],[20]     785 [7],[8],[16]              
Investment, Identifier [Axis]: Mai Capital Management Intermediate LLC | First lien - Drawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10],[20] 1,878                    
Cost [3],[4],[10],[20] 1,861                    
Fair Value [3],[4],[10],[20] 1,878                    
Investment, Identifier [Axis]: Mai Capital Management Intermediate LLC | First lien - Drawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12],[16]       1,979              
Cost [7],[8],[12],[16]       1,959              
Fair Value [7],[8],[12],[16]       1,979              
Investment, Identifier [Axis]: Mai Capital Management Intermediate LLC | First lien - Drawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       57              
Cost [7],[8],[12]       57              
Fair Value [7],[8],[12]       57              
Investment, Identifier [Axis]: Mai Capital Management Intermediate LLC | First lien - Undrawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 1,099 [3],[4],[9],[10]     1,709 [7],[8],[11],[12]              
Cost 0 [3],[4],[10]     0 [7],[8],[12]              
Fair Value 0 [3],[4],[10]     0 [7],[8],[12]              
Investment, Identifier [Axis]: Mai Capital Management Intermediate LLC | First lien - Undrawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 308 [3],[4],[9],[10]     251 [7],[8],[11],[12]              
Cost (2) [3],[4],[10]     (1) [7],[8],[12]              
Fair Value 0 [3],[4],[10]     0 [7],[8],[12]              
Investment, Identifier [Axis]: Matterhorn Finco, Inc. | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10],[23] 1,985                    
Cost [3],[4],[10],[23] (10)                    
Fair Value [3],[4],[10],[23] (10)                    
Investment, Identifier [Axis]: Matterhorn Finco, Inc., | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[9],[17],[18],[23] 7,963                    
Cost [3],[17],[18],[23] 7,925                    
Fair Value [3],[17],[18],[23] 7,923                    
Investment, Identifier [Axis]: Meta Buyer LLC | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [11],[14],[15]       2,987              
Cost [14],[15]       2,972              
Fair Value [14],[15]       2,972              
Investment, Identifier [Axis]: Meta Buyer LLC | First lien - Drawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10] 176                    
Cost [3],[4],[10] 175                    
Fair Value [3],[4],[10] 175                    
Investment, Identifier [Axis]: Meta Buyer LLC | First lien - Drawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10] 160                    
Cost [3],[4],[10] 159                    
Fair Value [3],[4],[10] 159                    
Investment, Identifier [Axis]: Meta Buyer LLC | First lien - Undrawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 376 [3],[4],[9],[10]     819 [8],[11],[12]              
Cost (1) [3],[4],[10]     0 [8],[12]              
Fair Value (2) [3],[4],[10]     0 [8],[12]              
Investment, Identifier [Axis]: Meta Buyer LLC | First lien - Undrawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 642 [3],[4],[9],[10]     409 [8],[11],[12]              
Cost 0 [3],[4],[10]     0 [8],[12]              
Fair Value (3) [3],[4],[10]     0 [8],[12]              
Investment, Identifier [Axis]: Meta Buyer LLC | First lien - Undrawn 3                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [8],[11],[12]       536              
Cost [8],[12]       (2)              
Fair Value [8],[12]       (2)              
Investment, Identifier [Axis]: Meta Buyer LLC | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[9],[17],[18] 2,972                    
Cost [3],[17],[18] 2,958                    
Fair Value [3],[17],[18] 2,957                    
Investment, Identifier [Axis]: Meta Buyer LLC | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9] 408                    
Cost [3],[4] 405                    
Fair Value [3],[4] 406                    
Investment, Identifier [Axis]: Model N, Inc. | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[11],[14],[15]       43,774              
Cost [7],[14],[15]       43,592              
Fair Value [7],[14],[15]       43,774              
Investment, Identifier [Axis]: Model N, Inc. | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10] 4,825                    
Cost [3],[4],[10] (24)                    
Fair Value [3],[4],[10] 0                    
Investment, Identifier [Axis]: Model N, Inc. | First lien - Undrawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       9,047              
Cost [7],[8],[12]       0              
Fair Value [7],[8],[12]       0              
Investment, Identifier [Axis]: Model N, Inc. | First lien - Undrawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       4,825              
Cost [7],[8],[12]       (24)              
Fair Value [7],[8],[12]       0              
Investment, Identifier [Axis]: Model N, Inc. | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[9],[17],[18] 43,442                    
Cost [3],[17],[18] 43,281                    
Fair Value [3],[17],[18] 43,442                    
Investment, Identifier [Axis]: Model N, Inc. | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[20] 4,501                    
Cost [3],[4],[20] 4,479                    
Fair Value [3],[4],[20] 4,501                    
Investment, Identifier [Axis]: NC Topco, LLC | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[11],[14],[15]       5,862              
Cost [7],[14],[15]       5,838              
Fair Value [7],[14],[15]       5,862              
Investment, Identifier [Axis]: NC Topco, LLC | First lien - Drawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[9],[17],[18] 5,819                    
Cost [3],[17],[18] 5,797                    
Fair Value [3],[17],[18] 5,819                    
Investment, Identifier [Axis]: NC Topco, LLC | First lien - Drawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[20] 1,660                    
Cost [3],[4],[20] 1,652                    
Fair Value [3],[4],[20] 1,660                    
Investment, Identifier [Axis]: NC Topco, LLC | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10] 669                    
Cost [3],[4],[10] (3)                    
Fair Value [3],[4],[10] 0                    
Investment, Identifier [Axis]: NC Topco, LLC | First lien - Undrawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       1,672              
Cost [7],[8],[12]       0              
Fair Value [7],[8],[12]       0              
Investment, Identifier [Axis]: NC Topco, LLC | First lien - Undrawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       669              
Cost [7],[8],[12]       (3)              
Fair Value [7],[8],[12]       0              
Investment, Identifier [Axis]: NHME Holdings Corp. | Ordinary shares                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [7],[8],[46],[47]       4,000              
Fair Value [7],[8],[46],[47]       0              
Investment, Identifier [Axis]: NHME Holdings Corp. | Warrants                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [7],[8],[46],[47]       1,000              
Fair Value [7],[8],[46],[47]       0              
Investment, Identifier [Axis]: NM GP Holdco, LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Fair Value 406     390     322        
Investment, Identifier [Axis]: NM GP Holdco, LLC | Membership Interest                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [3],[23],[48],[49] 862                    
Fair Value [3],[23],[48],[49] 406                    
Investment, Identifier [Axis]: NM GP Holdco, LLC | Membership interest                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [7],[22],[47],[50]       850              
Fair Value [7],[22],[47],[50]       390              
Investment, Identifier [Axis]: NM NL Holdings, L.P.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Fair Value 111,959     106,096     104,512        
Investment, Identifier [Axis]: NM NL Holdings, L.P. | Membership Interest                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [3],[23],[48],[49] 73,202                    
Fair Value [3],[23],[48],[49] 111,959                    
Investment, Identifier [Axis]: NM NL Holdings, L.P. | Membership interest                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [7],[22],[47],[50]       74,248              
Fair Value [7],[22],[47],[50]       106,096              
Investment, Identifier [Axis]: NM YI LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Fair Value       8,641     9,960        
Investment, Identifier [Axis]: NM YI, LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Fair Value 8,784     8,641              
Investment, Identifier [Axis]: NM YI, LLC | Membership Interest                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [3],[48],[49] 6,272                    
Fair Value [3],[48],[49] 8,784                    
Investment, Identifier [Axis]: NM YI, LLC | Membership interest                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [7],[47],[50]       6,272              
Fair Value [7],[47],[50]       8,641              
Investment, Identifier [Axis]: NMFC Senior Loan Program III LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Fair Value 155,200     160,000     160,000        
Investment, Identifier [Axis]: NMFC Senior Loan Program III LLC | Membership Interest                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [3],[4],[23],[49] 160,000                    
Fair Value [3],[4],[23],[49] 155,200                    
Investment, Identifier [Axis]: NMFC Senior Loan Program III LLC | Membership interest                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [7],[8],[22],[47]       160,000              
Fair Value [7],[8],[22],[47]       160,000              
Investment, Identifier [Axis]: NMFC Senior Loan Program IV LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Fair Value 102,284     112,400     112,400        
Investment, Identifier [Axis]: NMFC Senior Loan Program IV LLC | Membership Interest                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [3],[4],[23],[49] 112,400                    
Fair Value [3],[4],[23],[49] 102,284                    
Investment, Identifier [Axis]: NMFC Senior Loan Program IV LLC | Membership interest                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [7],[8],[22],[47]       112,400              
Fair Value [7],[8],[22],[47]       112,400              
Investment, Identifier [Axis]: National HME, Inc. | Second lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[46],[47]       8,281              
Cost [7],[8],[46],[47]       7,872              
Fair Value [7],[8],[46],[47]       0              
Investment, Identifier [Axis]: National HME, Inc./NHME Holdings Corp.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Fair Value 0     0     3,000        
Investment, Identifier [Axis]: Nelipak Holding Company | First lien - Drawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10],[20] 428                    
Cost [3],[4],[10],[20] 425                    
Fair Value [3],[4],[10],[20] 428                    
Investment, Identifier [Axis]: Nelipak Holding Company | First lien - Drawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12],[16]       2,168              
Cost [7],[8],[12],[16]       2,152              
Fair Value [7],[8],[12],[16]       2,168              
Investment, Identifier [Axis]: Nelipak Holding Company | First lien - Drawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12],[16],[51]       392              
Cost [7],[8],[12],[16],[51]       389              
Fair Value [7],[8],[12],[16],[51]       392              
Investment, Identifier [Axis]: Nelipak Holding Company | First lien - Drawn 3                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount       123 € 105 [12]            
Cost [7],[8],[12]       121              
Fair Value [7],[8],[12]       123              
Investment, Identifier [Axis]: Nelipak Holding Company | First lien - Undrawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 1,332 [3],[4],[9],[10]     1,332 [7],[8],[11],[12]              
Cost 0 [3],[4],[10]     0 [7],[8],[12]              
Fair Value 0 [3],[4],[10]     0 [7],[8],[12]              
Investment, Identifier [Axis]: Nelipak Holding Company | First lien - Undrawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 7,264 € 6,411 [10]   7,529 6,411 [12],[16],[51]            
Cost 0 [3],[4],[10],[20],[52]     0 [7],[8],[12],[16],[51]              
Fair Value 0 [3],[4],[10],[20],[52]     0 [7],[8],[12],[16],[51]              
Investment, Identifier [Axis]: Nelipak Holding Company | First lien - Undrawn 3                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 1,355 1,196 [10]   1,282 1,092 [12],[16],[51]            
Cost (10) [3],[4],[10],[20],[52]     (8) [7],[8],[12],[16],[51]              
Fair Value 0 [3],[4],[10],[20],[52]     0 [7],[8],[12],[16],[51]              
Investment, Identifier [Axis]: Nelipak Holding Company | First lien - Undrawn 4                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 2,185 [3],[4],[9],[10]     2,221 [7],[8],[11],[12]              
Cost (16) [3],[4],[10]     (17) [7],[8],[12]              
Fair Value 0 [3],[4],[10]     0 [7],[8],[12]              
Investment, Identifier [Axis]: Nelipak Holding Company | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 18,398 € 16,234   19,212 € 16,357 [16],[51]            
Cost 17,495 [3],[4],[20],[52]     17,614 [7],[8],[16],[51]              
Fair Value 18,398 [3],[4],[20],[52]     19,214 [7],[8],[16],[51]              
Investment, Identifier [Axis]: Nelipak Holding Company | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 8,865 [3],[9],[17],[18]     8,932 [7],[11],[14],[15]              
Cost 8,818 [3],[17],[18]     8,878 [7],[14],[15]              
Fair Value 8,865 [3],[17],[18]     8,932 [7],[14],[15]              
Investment, Identifier [Axis]: Nelipak Holding Company | First lien 3                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[20] 2,152                    
Cost [3],[4],[20] 2,138                    
Fair Value [3],[4],[20] 2,152                    
Investment, Identifier [Axis]: New ACI Buyer LLC | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[9],[17],[18] 3,563                    
Cost [3],[17],[18] 3,563                    
Fair Value [3],[17],[18] 3,563                    
Investment, Identifier [Axis]: New ACI Buyer LLC | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[9],[18] 1,836                    
Cost [3],[18] 1,836                    
Fair Value [3],[18] 1,836                    
Investment, Identifier [Axis]: New ACI Buyer LLC | First lien 3                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9] 1,682                    
Cost [3],[4] 1,682                    
Fair Value [3],[4] 1,682                    
Investment, Identifier [Axis]: New ACI Buyer LLC | Subordinated 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[9],[18] 3,256                    
Cost [3],[18] 3,256                    
Fair Value [3],[18] 3,256                    
Investment, Identifier [Axis]: New ACI Buyer LLC | Subordinated 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9] 1,537                    
Cost [3],[4] 1,537                    
Fair Value [3],[4] 1,537                    
Investment, Identifier [Axis]: New ACI Holdings LLC | Class A Common Units 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [3],[18] 7,587                    
Fair Value [3],[18] 7,587                    
Investment, Identifier [Axis]: New ACI Holdings LLC | Class A Common Units 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [3],[4] 3,582                    
Fair Value [3],[4] 3,582                    
Investment, Identifier [Axis]: New ACI Holdings LLC | Class B Common Units                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [3],[4] 630                    
Fair Value [3],[4] 630                    
Investment, Identifier [Axis]: New Benevis Holdco, Inc. | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[9],[18],[49] 26,421                    
Cost [3],[18],[49] 26,421                    
Fair Value [3],[18],[49] 26,421                    
Investment, Identifier [Axis]: New Benevis Holdco, Inc. | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[11],[15],[47]       51,933              
Cost [7],[15],[47]       51,933              
Fair Value [7],[15],[47]       51,933              
Investment, Identifier [Axis]: New Benevis Holdco, Inc. | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[16],[47]       45,204              
Cost [7],[8],[16],[47]       45,204              
Fair Value [7],[8],[16],[47]       45,204              
Investment, Identifier [Axis]: New Benevis Holdco, Inc. | Subordinated                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 29,426 [3],[4],[9],[49]     26,878 [7],[8],[11],[47]              
Cost 29,300 [3],[4],[49]     26,483 [7],[8],[47]              
Fair Value 29,426 [3],[4],[49]     26,878 [7],[8],[47]              
Investment, Identifier [Axis]: New Benevis Topco, LLC / New Benevis Holdco, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Fair Value 91,749     154,464     140,102        
Investment, Identifier [Axis]: New Benevis Topco, LLC | Common Stock 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [3],[18],[49] 27,154                    
Fair Value [3],[18],[49] 24,446                    
Investment, Identifier [Axis]: New Benevis Topco, LLC | Common Stock 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [3],[4],[49] 12,768                    
Fair Value [3],[4],[49] 11,456                    
Investment, Identifier [Axis]: New Benevis Topco, LLC | Common stock 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [7],[15],[47]       27,155              
Fair Value [7],[15],[47]       20,733              
Investment, Identifier [Axis]: New Benevis Topco, LLC | Common stock 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [7],[8],[47]       12,768              
Fair Value [7],[8],[47]       9,716              
Investment, Identifier [Axis]: New Permian Holdco, Inc. / New Permian Holdco, L.L.C.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Fair Value 67,394     63,833     63,076        
Investment, Identifier [Axis]: New Permian Holdco, Inc. | Ordinary Shares                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [3],[4],[49] 11,155                    
Fair Value [3],[4],[49] 11,000                    
Investment, Identifier [Axis]: New Permian Holdco, Inc. | Ordinary shares                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [7],[8],[47]       11,155              
Fair Value [7],[8],[47]       12,000              
Investment, Identifier [Axis]: New Permian Holdco, L.L.C. | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 23,336 [3],[4],[9],[20],[49]     23,336 [7],[8],[11],[16],[47]              
Cost 23,336 [3],[4],[20],[49]     23,336 [7],[8],[16],[47]              
Fair Value 23,336 [3],[4],[20],[49]     23,336 [7],[8],[16],[47]              
Investment, Identifier [Axis]: New Permian Holdco, L.L.C. | First lien - Drawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 33,058 [3],[4],[9],[10],[20],[49]     28,497 [7],[8],[11],[12],[16],[47]              
Cost 33,058 [3],[4],[10],[20],[49]     28,497 [7],[8],[12],[16],[47]              
Fair Value 33,058 [3],[4],[10],[20],[49]     28,497 [7],[8],[12],[16],[47]              
Investment, Identifier [Axis]: New Permian Holdco, L.L.C. | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 836 [3],[4],[9],[10],[49]     3,397 [7],[8],[11],[12],[47]              
Cost 0 [3],[4],[10],[49]     0 [7],[8],[12],[47]              
Fair Value 0 [3],[4],[10],[49]     0 [7],[8],[12],[47]              
Investment, Identifier [Axis]: Next Holdco, LLC | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 6,217 [3],[9],[17],[18]     6,264 [7],[11],[14],[15]              
Cost 6,189 [3],[17],[18]     6,232 [7],[14],[15]              
Fair Value 6,217 [3],[17],[18]     6,264 [7],[14],[15]              
Investment, Identifier [Axis]: Next Holdco, LLC | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 339 [3],[4],[9],[10]     339 [7],[8],[11],[12]              
Cost (3) [3],[4],[10]     (3) [7],[8],[12]              
Fair Value 0 [3],[4],[10]     0 [7],[8],[12]              
Investment, Identifier [Axis]: Notorious Buyer, LLC | Common Stock                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [3],[4],[53] 7,339                    
Fair Value [3],[4],[53] 4,859                    
Investment, Identifier [Axis]: Notorious Buyer, LLC | Common stock                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [7],[8],[54]       7,339              
Fair Value [7],[8],[54]       7,339              
Investment, Identifier [Axis]: Notorious Topco, LLC | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 5,117 [3],[4],[9]     4,692 [7],[8],[11]              
Cost 5,117 [3],[4]     4,692 [7],[8]              
Fair Value 5,117 [3],[4]     4,692 [7],[8]              
Investment, Identifier [Axis]: Notorious Topco, LLC | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 938 [3],[4],[9],[10],[53]     938 [7],[8],[11],[12],[54]              
Cost 0 [3],[4],[10],[53]     0 [7],[8],[12],[54]              
Fair Value 0 [3],[4],[10],[53]     0 [7],[8],[12],[54]              
Investment, Identifier [Axis]: Notorious Topco, LLC | Subordinated                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 2,490 [3],[4],[9]     2,252 [7],[8],[11]              
Cost 2,490 [3],[4]     2,252 [7],[8]              
Fair Value 2,490 [3],[4]     2,252 [7],[8]              
Investment, Identifier [Axis]: OEConnection LLC | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 6,609 [3],[9],[17],[18]     6,609 [11],[14],[15]              
Cost 6,585 [3],[17],[18]     6,582 [14],[15]              
Fair Value 6,560 [3],[17],[18]     6,620 [14],[15]              
Investment, Identifier [Axis]: OEConnection LLC | First lien - Undrawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 495 [3],[4],[9],[10]     495 [8],[11],[12]              
Cost 0 [3],[4],[10]     0 [8],[12]              
Fair Value (4) [3],[4],[10]     1 [8],[12]              
Investment, Identifier [Axis]: OEConnection LLC | First lien - Undrawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 618 [3],[4],[9],[10]     618 [8],[11],[12]              
Cost (3) [3],[4],[10]     (3) [8],[12]              
Fair Value (5) [3],[4],[10]     0 [8],[12]              
Investment, Identifier [Axis]: PDI TA Holdings, Inc. | First lien - Drawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       1,342              
Cost [7],[8],[12]       1,335              
Fair Value [7],[8],[12]       1,342              
Investment, Identifier [Axis]: PDI TA Holdings, Inc. | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       488              
Cost [7],[8],[12]       (2)              
Fair Value [7],[8],[12]       0              
Investment, Identifier [Axis]: PDI TA Holdings, Inc. | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 22,283 [3],[9],[13]     22,171 [7],[11],[19]              
Cost 22,205 [3],[13]     22,081 [7],[19]              
Fair Value 21,057 [3],[13]     22,171 [7],[19]              
Investment, Identifier [Axis]: PDI TA Holdings, Inc. | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 1,830 [3],[4],[9]     509 [7],[8],[11],[16]              
Cost 1,822 [3],[4]     509 [7],[8],[16]              
Fair Value 1,730 [3],[4]     509 [7],[8],[16]              
Investment, Identifier [Axis]: PDI TA Holdings, Inc. | First lien 3                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[20] 512                    
Cost [3],[4],[20] 512                    
Fair Value [3],[4],[20] 484                    
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC | First lien - Drawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 195 [3],[4],[9],[10],[20]     61 [7],[8],[11],[12],[16]              
Cost 196 [3],[4],[10],[20]     64 [7],[8],[12],[16]              
Fair Value 191 [3],[4],[10],[20]     61 [7],[8],[12],[16]              
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 292 [3],[4],[9],[10]     426 [7],[8],[11],[12]              
Cost (6) [3],[4],[10]     (9) [7],[8],[12]              
Fair Value (6) [3],[4],[10]     0 [7],[8],[12]              
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 21,994 [3],[9],[13]     22,163 [7],[11],[19]              
Cost 21,958 [3],[13]     22,118 [7],[19]              
Fair Value 21,554 [3],[13]     22,163 [7],[19]              
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 8,113 [3],[9],[17],[18]     8,175 [7],[11],[14],[15]              
Cost 8,113 [3],[17],[18]     8,175 [7],[14],[15]              
Fair Value 7,951 [3],[17],[18]     8,175 [7],[14],[15]              
Investment, Identifier [Axis]: PPVA Black Elk (Equity) LLC | Claim                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9] 14,500                    
Cost [3],[4] 14,500                    
Fair Value [3],[4] 2,755                    
Investment, Identifier [Axis]: PPVA Black Elk (Equity) LLC | Subordinated                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11]       14,500              
Cost 14,500     14,500 [7],[8]              
Fair Value 2,755     6,525 [7],[8]              
Investment, Identifier [Axis]: PPVA Black Elk (Equity) LLC, Subordinated                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount                     $ 20,000
Investment, Identifier [Axis]: PPVA Fund, L.P. | Claim                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [9],[55] 0                    
Cost [55] 0                    
Fair Value [55] 0                    
Investment, Identifier [Axis]: PPVA Fund, L.P. | Collateralized Financing                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [11],[56],[57]       0              
Cost [56],[57]       0              
Fair Value [56],[57]       0              
Investment, Identifier [Axis]: Permian Trust | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 3,409 [3],[4],[9],[29]     3,409 [7],[8],[11],[30]              
Cost 0 [3],[4],[29]     0 [7],[8],[30]              
Fair Value 0 [3],[4],[29]     0 [7],[8],[30]              
Investment, Identifier [Axis]: Permian Trust | Trust Claim                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 247 [3],[9],[29],[58]     247 [7],[11],[30],[59]              
Cost 0 [3],[29],[58]     0 [7],[30],[59]              
Fair Value 0 [3],[29],[58]     0 [7],[30],[59]              
Investment, Identifier [Axis]: PetVet Care Centers, LLC | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 27,648 [3],[9],[17],[18]     27,861 [7],[11],[14],[15]              
Cost 27,462 [3],[17],[18]     27,646 [7],[14],[15]              
Fair Value 23,788 [3],[17],[18]     26,649 [7],[14],[15]              
Investment, Identifier [Axis]: PetVet Care Centers, LLC | First lien - Drawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 1,483 [3],[4],[9],[10],[20]     371 [7],[8],[11],[12],[16]              
Cost 1,468 [3],[4],[10],[20]     367 [7],[8],[12],[16]              
Fair Value 1,276 [3],[4],[10],[20]     355 [7],[8],[12],[16]              
Investment, Identifier [Axis]: PetVet Care Centers, LLC | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 2,225 [3],[4],[9],[10]     3,337 [7],[8],[11],[12]              
Cost (22) [3],[4],[10]     (33) [7],[8],[12]              
Fair Value (311) [3],[4],[10]     (145) [7],[8],[12]              
Investment, Identifier [Axis]: Pioneer Topco I, L.P. | Class A-2 Common Units                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [3],[60] 2,000                    
Fair Value [3],[60] 1,600                    
Investment, Identifier [Axis]: Pioneer Topco I, L.P. | Class A-2 common units                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [7],[61]       2,000              
Fair Value [7],[61]       2,200              
Investment, Identifier [Axis]: Planview Parent, Inc. | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [4],[9],[20] 3,745                    
Cost [4],[20] 3,201                    
Fair Value [4],[20] 3,137                    
Investment, Identifier [Axis]: Planview Parent, Inc. | Second lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 9,231 [3],[4],[9],[20]     9,231 [7],[8],[11],[16]              
Cost 9,216 [3],[4],[20]     9,212 [7],[8],[16]              
Fair Value 6,415 [3],[4],[20]     8,827 [7],[8],[16]              
Investment, Identifier [Axis]: Power Grid Holdings, Inc. | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[11],[19]       15,597              
Cost [7],[19]       15,511              
Fair Value [7],[19]       15,597              
Investment, Identifier [Axis]: Power Grid Holdings, Inc. | First lien - Drawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       429              
Cost [7],[8],[12]       425              
Fair Value [7],[8],[12]       429              
Investment, Identifier [Axis]: Power Grid Holdings, Inc. | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       3,861              
Cost [7],[8],[12]       (39)              
Fair Value [7],[8],[12]       0              
Investment, Identifier [Axis]: Project Accelerate Parent, LLC | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 10,334 [3],[9],[24]     10,413 [7],[11],[25]              
Cost 10,298 [3],[24]     10,372 [7],[25]              
Fair Value 10,334 [3],[24]     10,413 [7],[25]              
Investment, Identifier [Axis]: Project Accelerate Parent, LLC | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 1,510 [3],[4],[9],[10]     1,510 [7],[8],[11],[12]              
Cost (8) [3],[4],[10]     (8) [7],[8],[12]              
Fair Value 0 [3],[4],[10]     0 [7],[8],[12]              
Investment, Identifier [Axis]: RLG Holdings, LLC | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 18,528 [3],[4],[9],[20]     7,184 [11],[14],[15]              
Cost 10,242 [3],[4],[20]     5,816 [14],[15]              
Fair Value 8,439 [3],[4],[20]     4,419 [14],[15]              
Investment, Identifier [Axis]: RLG Holdings, LLC | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 7,128 [3],[9],[17],[18]     4,163 [11],[14],[15]              
Cost 6,124 [3],[17],[18]     4,109 [14],[15]              
Fair Value 3,247 [3],[17],[18]     2,613 [14],[15]              
Investment, Identifier [Axis]: RLG Holdings, LLC | First lien 3                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[9],[17],[18] 4,131                    
Cost [3],[17],[18] 4,091                    
Fair Value [3],[17],[18] 1,882                    
Investment, Identifier [Axis]: RLG Holdings, LLC | First lien 4                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[20] 1,188                    
Cost [3],[4],[20] 625                    
Fair Value [3],[4],[20] 541                    
Investment, Identifier [Axis]: RLG Holdings, LLC | Second lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[20] 10,768                    
Cost [3],[4],[20] 1,542                    
Fair Value [3],[4],[20] 1,077                    
Investment, Identifier [Axis]: RailPros Parent, LLC | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 5,784 [3],[9],[17],[18]     5,828 [7],[11],[14],[15]              
Cost 5,761 [3],[17],[18]     5,801 [7],[14],[15]              
Fair Value 5,784 [3],[17],[18]     5,799 [7],[14],[15]              
Investment, Identifier [Axis]: RailPros Parent, LLC | First lien - Drawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10] 537                    
Cost [3],[4],[10] 534                    
Fair Value [3],[4],[10] 537                    
Investment, Identifier [Axis]: RailPros Parent, LLC | First lien - Undrawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 1,258 [3],[4],[9],[10]     899 [7],[8],[11],[12]              
Cost 0 [3],[4],[10]     (4) [7],[8],[12]              
Fair Value 0 [3],[4],[10]     (4) [7],[8],[12]              
Investment, Identifier [Axis]: RailPros Parent, LLC | First lien - Undrawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 899 [3],[4],[9],[10]     1,798 [7],[8],[11],[12]              
Cost (4) [3],[4],[10]     0 [7],[8],[12]              
Fair Value 0 [3],[4],[10]     (9) [7],[8],[12]              
Investment, Identifier [Axis]: RealPage, Inc. | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [9],[17],[18] 1,953                    
Cost [17],[18] 1,857                    
Fair Value [17],[18] 1,934                    
Investment, Identifier [Axis]: Reorganized Careismatic Brands, LLC | Trust Claim 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 152 [3],[9],[18]     152 [7],[11],[15]              
Cost 152 [3],[18]     152 [7],[15]              
Fair Value 152 [3],[18]     152 [7],[15]              
Investment, Identifier [Axis]: Reorganized Careismatic Brands, LLC | Trust Claim 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 52 [3],[4],[9]     52 [7],[8],[11]              
Cost 52 [3],[4]     52 [7],[8]              
Fair Value 52 [3],[4]     52 [7],[8]              
Investment, Identifier [Axis]: Reorganized Careismatic Brands, LLC | Warrants 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost 182 [3],[18]     182 [7],[15]              
Fair Value 272 [3],[18]     272 [7],[15]              
Investment, Identifier [Axis]: Reorganized Careismatic Brands, LLC | Warrants 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost 62 [3],[4]     62 [7],[8]              
Fair Value 93 [3],[4]     93 [7],[8]              
Investment, Identifier [Axis]: Riskonnect Parent, LLC | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       6,349              
Cost [7],[8],[12]       0              
Fair Value [7],[8],[12]       0              
Investment, Identifier [Axis]: Sierra Enterprises, LLC | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[11],[14],[15]       21,357              
Cost [7],[14],[15]       21,213              
Fair Value [7],[14],[15]       21,197              
Investment, Identifier [Axis]: Sierra Enterprises, LLC | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       2,717              
Cost [7],[8],[12]       (20)              
Fair Value [7],[8],[12]       (20)              
Investment, Identifier [Axis]: Sierra Hamilton Holdings Corporation                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Fair Value 1,889     2,000     2,000        
Investment, Identifier [Axis]: Sierra Hamilton Holdings Corporation | Ordinary Shares 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [3],[18],[29] 11,501                    
Fair Value [3],[18],[29] 1,700                    
Investment, Identifier [Axis]: Sierra Hamilton Holdings Corporation | Ordinary Shares 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [3],[4],[29] 1,282                    
Fair Value [3],[4],[29] 189                    
Investment, Identifier [Axis]: Sierra Hamilton Holdings Corporation | Ordinary shares 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [7],[15],[30]       11,501              
Fair Value [7],[15],[30]       1,799              
Investment, Identifier [Axis]: Sierra Hamilton Holdings Corporation | Ordinary shares 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [7],[8],[30]       1,282              
Fair Value [7],[8],[30]       201              
Investment, Identifier [Axis]: Symplr Software Intermediate Holdings, Inc. | Series A Preferred Shares 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [3],[13] 19,636                    
Fair Value [3],[13] 15,467                    
Investment, Identifier [Axis]: Symplr Software Intermediate Holdings, Inc. | Series A Preferred Shares 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [3],[4] 91                    
Fair Value [3],[4] 71                    
Investment, Identifier [Axis]: Symplr Software Intermediate Holdings, Inc. | Series A preferred shares                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 19,839     25,639              
Investment, Identifier [Axis]: Symplr Software Intermediate Holdings, Inc. | Series A preferred shares 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [7],[19]       18,953              
Fair Value [7],[19]       18,204              
Investment, Identifier [Axis]: Symplr Software Intermediate Holdings, Inc. | Series A preferred shares 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [7],[8],[16]       6,534              
Fair Value [7],[8],[16]       6,276              
Investment, Identifier [Axis]: TMK Hawk Parent, Corp. | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 2,695 [3],[4],[9],[10],[62]     2,695 [7],[8],[11],[12],[63]              
Cost 0 [3],[4],[10],[62]     0 [7],[8],[12],[63]              
Fair Value 0 [3],[4],[10],[62]     0 [7],[8],[12],[63]              
Investment, Identifier [Axis]: TMK Hawk Parent, Corp. | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 27,354 [3],[4],[9],[20]     22,939 [7],[8],[11],[16]              
Cost 24,795 [3],[4],[20]     22,392 [7],[8],[16]              
Fair Value 17,123 [3],[4],[20]     14,820 [7],[8],[16]              
Investment, Identifier [Axis]: TMK Hawk Parent, Corp. | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 10,213 [3],[4],[9],[20]     4,057 [7],[8],[11],[16]              
Cost 6,233 [3],[4],[20]     2,878 [7],[8],[16]              
Fair Value 6,393 [3],[4],[20]     2,594 [7],[8],[16]              
Investment, Identifier [Axis]: TMK Hawk Parent, Corp. | Subordinated 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 424 [3],[4],[9]     337 [7],[11],[15]              
Cost 359 [3],[4]     337 [7],[15]              
Fair Value 424 [3],[4]     337 [7],[15]              
Investment, Identifier [Axis]: TMK Hawk Parent, Corp. | Subordinated 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 366 [3],[9],[18]     325 [7],[8],[11]              
Cost 366 [3],[18]     325 [7],[8]              
Fair Value 366 [3],[18]     325 [7],[8]              
Investment, Identifier [Axis]: TVG-Edmentum Holdings, LLC / Edmentum Ultimate Holdings, LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Fair Value 45,155     40,365     91,620        
Investment, Identifier [Axis]: TVG-Edmentum Holdings, LLC | Class B-1 Common Shares                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 48,080     48,080              
Cost 43,212 [3],[4],[29]     43,212 [8],[30],[51]              
Fair Value 5,000 [3],[4],[29]     5,000 [8],[30],[51]              
Investment, Identifier [Axis]: TVG-Edmentum Holdings, LLC | Class B-2 Common Shares                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 29,707     29,707              
Cost 24,839 [3],[4],[29]     24,839 [8],[30],[51]              
Fair Value 0 [3],[4],[29]     0 [8],[30],[51]              
Investment, Identifier [Axis]: TVG-Edmentum Holdings, LLC | Series C-2 Preferred Shares                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 9,737                    
Investment, Identifier [Axis]: TVG-Edmentum Holdings, LLC | Series C-2 Preferred Units                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost 9,737 [3],[4],[29]     8,719 [7],[8],[30]              
Fair Value 9,737 [3],[4],[29]     8,719 [7],[8],[30]              
Investment, Identifier [Axis]: Tempo Acquisition, LLC | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [4],[9],[20],[23] 27,466                    
Cost [4],[20],[23] 20,457                    
Fair Value [4],[20],[23] 21,864                    
Investment, Identifier [Axis]: Tennessee Bidco Limited | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 20,218 [3],[4],[9],[20]     19,815 [7],[8],[11],[16]              
Cost 20,296 [3],[4],[20]     19,903 [7],[8],[16]              
Fair Value 20,218 [3],[4],[20]     19,815 [7],[8],[16]              
Investment, Identifier [Axis]: Tennessee Bidco Limited | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 16,576 [3],[9],[17],[18]     16,245 [7],[11],[14],[15]              
Cost 16,576 [3],[17],[18]     16,245 [7],[14],[15]              
Fair Value 16,576 [3],[17],[18]     16,245 [7],[14],[15]              
Investment, Identifier [Axis]: Tennessee Bidco Limited | First lien 3                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 899 [3],[9],[17],[18]     890 [7],[11],[14],[15]              
Cost 899 [3],[17],[18]     890 [7],[14],[15]              
Fair Value 899 [3],[17],[18]     890 [7],[14],[15]              
Investment, Identifier [Axis]: TigerConnect, Inc. | First lien - Drawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[11],[12],[15]       3,741              
Cost [7],[12],[15]       3,741              
Fair Value [7],[12],[15]       3,741              
Investment, Identifier [Axis]: TigerConnect, Inc. | First lien - Drawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       42              
Cost [7],[8],[12]       42              
Fair Value [7],[8],[12]       42              
Investment, Identifier [Axis]: TigerConnect, Inc. | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       4,267              
Cost [7],[8],[12]       (43)              
Fair Value [7],[8],[12]       0              
Investment, Identifier [Axis]: TigerConnect, Inc. | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 29,875 [3],[4],[9],[20]     29,875 [7],[8],[11],[16]              
Cost 29,755 [3],[4],[20]     29,728 [7],[8],[16]              
Fair Value 29,576 [3],[4],[20]     29,875 [7],[8],[16]              
Investment, Identifier [Axis]: TigerConnect, Inc. | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 3,741 [3],[9],[18]     3,054 [7],[8],[11],[16]              
Cost 3,741 [3],[18]     3,033 [7],[8],[16]              
Fair Value 3,704 [3],[18]     3,054 [7],[8],[16]              
Investment, Identifier [Axis]: TigerConnect, Inc. | First lien 3                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[20] 3,054                    
Cost [3],[4],[20] 3,037                    
Fair Value [3],[4],[20] 3,023                    
Investment, Identifier [Axis]: TigerConnect, Inc. | First lien 4                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9] 42                    
Cost [3],[4] 42                    
Fair Value [3],[4] 41                    
Investment, Identifier [Axis]: TigerConnect, Inc.| First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10] 4,267                    
Cost [3],[4],[10] (43)                    
Fair Value [3],[4],[10] (43)                    
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 818 [4],[9],[10]     818 [7],[8],[11],[12]              
Cost (8) [4],[10]     (8) [7],[8],[12]              
Fair Value 0 [4],[10]     0 [7],[8],[12]              
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 8,303 [9],[17],[18]     8,345 [7],[11],[14],[15]              
Cost 8,275 [17],[18]     8,310 [7],[14],[15]              
Fair Value 8,303 [17],[18]     8,345 [7],[14],[15]              
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 2,784 [9],[17],[18]     2,798 [7],[11],[14],[15]              
Cost 2,773 [17],[18]     2,784 [7],[14],[15]              
Fair Value 2,784 [17],[18]     2,798 [7],[14],[15]              
Investment, Identifier [Axis]: USRP Holdings, Inc. | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 12,299 [3],[9],[17],[18]     12,396 [7],[11],[14],[15]              
Cost 12,253 [3],[17],[18]     12,341 [7],[14],[15]              
Fair Value 12,299 [3],[17],[18]     12,396 [7],[14],[15]              
Investment, Identifier [Axis]: USRP Holdings, Inc. | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 893 [3],[4],[9],[10]     893 [7],[8],[11],[12]              
Cost (9) [3],[4],[10]     (9) [7],[8],[12]              
Fair Value 0 [3],[4],[10]     0 [7],[8],[12]              
Investment, Identifier [Axis]: Ultimus Group Midco, LLC | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[11],[14],[15]       9,116              
Cost [7],[14],[15]       9,073              
Fair Value [7],[14],[15]       9,070              
Investment, Identifier [Axis]: Ultimus Group Midco, LLC | First lien - Undrawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       1,139              
Cost [7],[8],[12]       (6)              
Fair Value [7],[8],[12]       (6)              
Investment, Identifier [Axis]: Ultimus Group Midco, LLC | First lien - Undrawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       3,039              
Cost [7],[8],[12]       0              
Fair Value [7],[8],[12]       (15)              
Investment, Identifier [Axis]: UniTek Global Services, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Fair Value 93,084     73,181     $ 107,524        
Investment, Identifier [Axis]: UniTek Global Services, Inc. | Ordinary Shares 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [3],[18],[49] 1,925                    
Fair Value [3],[18],[49] 0                    
Investment, Identifier [Axis]: UniTek Global Services, Inc. | Ordinary Shares 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [3],[4],[49] 532                    
Fair Value [3],[4],[49] 0                    
Investment, Identifier [Axis]: UniTek Global Services, Inc. | Ordinary shares 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [7],[15],[47]       1,925              
Fair Value [7],[15],[47]       0              
Investment, Identifier [Axis]: UniTek Global Services, Inc. | Ordinary shares 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [7],[8],[47]       532              
Fair Value [7],[8],[47]       0              
Investment, Identifier [Axis]: UniTek Global Services, Inc. | Preferred Shares 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [3],[4],[49] 71,326                    
Fair Value [3],[4],[49] 74,650                    
Investment, Identifier [Axis]: UniTek Global Services, Inc. | Preferred Shares 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [3],[4],[49] 29,318                    
Fair Value [3],[4],[49] 18,434                    
Investment, Identifier [Axis]: UniTek Global Services, Inc. | Preferred Shares 3                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [3],[18],[49] 26,946                    
Fair Value [3],[18],[49] 0                    
Investment, Identifier [Axis]: UniTek Global Services, Inc. | Preferred Shares 4                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [3],[4],[49] 7,447                    
Fair Value [3],[4],[49] 0                    
Investment, Identifier [Axis]: UniTek Global Services, Inc. | Preferred Shares 5                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [3],[4],[49] 0                    
Fair Value [3],[4],[49] 0                    
Investment, Identifier [Axis]: UniTek Global Services, Inc. | Preferred shares 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [7],[8],[47]       61,162              
Fair Value [7],[8],[47]       64,486              
Investment, Identifier [Axis]: UniTek Global Services, Inc. | Preferred shares 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [7],[8],[47]       29,318              
Fair Value [7],[8],[47]       8,695              
Investment, Identifier [Axis]: UniTek Global Services, Inc. | Preferred shares 3                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [7],[15],[47]       26,946              
Fair Value [7],[15],[47]       0              
Investment, Identifier [Axis]: UniTek Global Services, Inc. | Preferred shares 4                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Cost [7],[8],[47]       7,447              
Fair Value [7],[8],[47]       0              
Investment, Identifier [Axis]: Vehlo Purchaser, LLC | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 6,027 [3],[4],[9]     6,073 [8],[11]              
Cost 5,991 [3],[4]     6,022 [8]              
Fair Value 6,027 [3],[4]     6,042 [8]              
Investment, Identifier [Axis]: Viper Bidco, Inc. | First lien - Undrawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10] 1,838                    
Cost [3],[4],[10] 0                    
Fair Value [3],[4],[10] 0                    
Investment, Identifier [Axis]: Viper Bidco, Inc. | First lien - Undrawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[10] 3,320                    
Cost [3],[4],[10] (17)                    
Fair Value [3],[4],[10] 0                    
Investment, Identifier [Axis]: Viper Bidco,Inc. | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 15,686                    
Investment, Identifier [Axis]: Viper Bidco. Inc. | First lien - Undrawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       1,838              
Cost [7],[8],[12]       0              
Fair Value [7],[8],[12]       0              
Investment, Identifier [Axis]: Viper Bidco. Inc. | First lien - Undrawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       3,320              
Cost [7],[8],[12]       (17)              
Fair Value [7],[8],[12]       0              
Investment, Identifier [Axis]: Viper Bidco. Inc. | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount     £ 11,819 16,051   £ 11,910          
Cost 14,931 [3],[4],[20],[52]     15,037 [7],[8],[16],[51]              
Fair Value 15,686 [3],[4],[20],[52]     16,051 [7],[8],[16],[51]              
Investment, Identifier [Axis]: Viper Bidco. Inc. | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 2,288 [3],[4],[9],[20]     2,306 [7],[8],[11],[16]              
Cost 2,278 [3],[4],[20]     2,294 [7],[8],[16]              
Fair Value 2,288 [3],[4],[20]     2,306 [7],[8],[16]              
Investment, Identifier [Axis]: WEG Sub Intermediate Holdings, LLC | Subordinated                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 5,140 [3],[4],[9]     4,665 [7],[8],[11]              
Cost 5,101 [3],[4]     4,623 [7],[8]              
Fair Value 5,140 [3],[4]     4,665 [7],[8]              
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 2,040 [3],[4],[9],[10]     2,040 [7],[8],[11],[12]              
Cost (6) [3],[4],[10]     (6) [7],[8],[12]              
Fair Value 0 [3],[4],[10]     0 [7],[8],[12]              
Investment, Identifier [Axis]: Xactly Corporation | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 22,500 [3],[9],[13]     22,500 [7],[11],[19]              
Cost 22,493 [3],[13]     22,489 [7],[19]              
Fair Value 21,263 [3],[13]     22,232 [7],[19]              
Investment, Identifier [Axis]: Xactly Corporation | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 992 [3],[4],[9],[10]     992 [7],[8],[11],[12]              
Cost (10) [3],[4],[10]     (10) [7],[8],[12]              
Fair Value (55) [3],[4],[10]     (12) [7],[8],[12]              
Investment, Identifier [Axis]: YLG Holdings, Inc. | First lien - Drawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 623 [3],[4],[9],[10]     394 [7],[8],[11],[12]              
Cost 619 [3],[4],[10]     392 [7],[8],[12]              
Fair Value 623 [3],[4],[10]     394 [7],[8],[12]              
Investment, Identifier [Axis]: YLG Holdings, Inc. | First lien - Undrawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 39 [3],[4],[9],[10]     271 [7],[8],[11],[12]              
Cost 0 [3],[4],[10]     (1) [7],[8],[12]              
Fair Value 0 [3],[4],[10]     0 [7],[8],[12]              
Investment, Identifier [Axis]: YLG Holdings, Inc. | First lien - Undrawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 309 [3],[4],[9],[10]     309 [7],[8],[11],[12]              
Cost (2) [3],[4],[10]     (2) [7],[8],[12]              
Fair Value 0 [3],[4],[10]     0 [7],[8],[12]              
Investment, Identifier [Axis]: YLG Holdings, Inc. | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 21,498 [3],[9],[24]     21,661 [7],[11],[25]              
Cost 21,477 [3],[24]     21,638 [7],[25]              
Fair Value 21,498 [3],[24]     21,661 [7],[25]              
Investment, Identifier [Axis]: YLG Holdings, Inc. | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 4,276 [3],[9],[17],[18]     4,309 [7],[11],[14],[15]              
Cost 4,259 [3],[17],[18]     4,289 [7],[14],[15]              
Fair Value 4,276 [3],[17],[18]     4,309 [7],[14],[15]              
Investment, Identifier [Axis]: eResearchTechnology, Inc. | First lien - Drawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12],[16]       301              
Cost [7],[8],[12],[16]       290              
Fair Value [7],[8],[12],[16]       301              
Investment, Identifier [Axis]: eResearchTechnology, Inc. | First lien - Undrawn 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       1,847              
Cost [7],[8],[12]       0              
Fair Value [7],[8],[12]       0              
Investment, Identifier [Axis]: eResearchTechnology, Inc. | First lien - Undrawn 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[12]       1,074              
Cost [7],[8],[12]       (11)              
Fair Value [7],[8],[12]       0              
Investment, Identifier [Axis]: eResearchTechnology, Inc. | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[11],[14],[15]       11,380              
Cost [7],[14],[15]       11,275              
Fair Value [7],[14],[15]       11,380              
Investment, Identifier [Axis]: eResearchTechnology, Inc. | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[16]       1,889              
Cost [7],[8],[16]       1,877              
Fair Value [7],[8],[16]       1,889              
Investment, Identifier [Axis]: iCIMS, Inc. | First lien                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [3],[4],[9],[20] 7,366                    
Cost [3],[4],[20] 7,341                    
Fair Value [3],[4],[20] 6,782                    
Investment, Identifier [Axis]: iCIMS, Inc. | First lien - Drawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 1,588 [3],[4],[9],[10]     1,165 [7],[8],[11],[12]              
Cost 1,580 [3],[4],[10]     1,160 [7],[8],[12]              
Fair Value 1,444 [3],[4],[10]     1,134 [7],[8],[12]              
Investment, Identifier [Axis]: iCIMS, Inc. | First lien - Undrawn                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 1,941 [3],[4],[9],[10]     2,365 [7],[8],[11],[12]              
Cost (17) [3],[4],[10]     (21) [7],[8],[12]              
Fair Value (175) [3],[4],[10]     (64) [7],[8],[12]              
Investment, Identifier [Axis]: iCIMS, Inc. | First lien 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[16]       44,742              
Cost [7],[8],[16]       44,590              
Fair Value [7],[8],[16]       43,538              
Investment, Identifier [Axis]: iCIMS, Inc. | First lien 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount [7],[8],[11],[16]       7,366              
Cost [7],[8],[16]       7,332              
Fair Value [7],[8],[16]       7,253              
SLP IV                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 633,916     664,399              
Cost 627,324     654,867              
Fair Value 592,086     641,452              
SLP IV | Funded Investments                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 632,293     659,603              
Cost 627,331     654,884              
Fair Value 592,117     641,435              
SLP IV | Unfunded Investments                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 1,623     4,796              
Cost (7)     (17)              
Fair Value (31)     17              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | ADG, LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 18,327     18,217              
Cost 18,326     18,215              
Fair Value 11,846     14,574              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | ADMI Corp. (aka Aspen Dental)                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 1,781     1,795              
Cost 1,779     1,792              
Fair Value 1,688     1,708              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Accelya Lux Finco S.a r.l.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 10,420     10,498              
Cost 10,232     10,292              
Fair Value 9,430     10,466              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Allium Buyer LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 6,028                    
Cost 5,938                    
Fair Value 6,051                    
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | AmSpec Parent, LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 5,478     5,519              
Cost 5,473     5,514              
Fair Value 5,498     5,547              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Asurion, LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 3,134                    
Cost 3,118                    
Fair Value 2,911                    
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Asurion, LLC 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount       9,593              
Cost       9,542              
Fair Value       9,622              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Asurion, LLC 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount       1,809              
Cost       1,759              
Fair Value       1,811              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Asurion, LLC 3                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount       992              
Cost       979              
Fair Value       994              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | BCPE Empire Holdings, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount       8,509              
Cost       8,473              
Fair Value       8,434              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | BCPE Empire Holdings, Inc. 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 7,838                    
Cost 7,809                    
Fair Value 7,593                    
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | BCPE Empire Holdings, Inc. 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 3,633                    
Cost 3,583                    
Fair Value 3,505                    
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | BIFM CA Buyer Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 6,561     6,611              
Cost 6,547     6,585              
Fair Value 6,567     6,664              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | BW Holding, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount       445              
Cost       441              
Fair Value       454              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Bach Finance Limited                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount       1,595              
Cost       1,592              
Fair Value       1,602              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Bella Holding Company, LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 1,729     1,737              
Cost 1,714     1,736              
Fair Value 1,733     1,746              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Berlin Packaging L.L.C.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 4,890     4,927              
Cost 4,892     4,930              
Fair Value 4,860     4,944              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Boxer Parent Company Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount       5,216              
Cost       5,205              
Fair Value       5,208              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | BradyPLUS Holdings, LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount       3,650              
Cost       3,596              
Fair Value       3,618              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | CVET Midco 2, L.P.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 6,472     6,522              
Cost 6,374     6,402              
Fair Value 6,300     5,879              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Capstone Borrower, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount       1,989              
Cost       1,979              
Fair Value       1,991              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Cardinal Parent, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 6,990     7,046              
Cost 6,930     6,947              
Fair Value 6,287     6,898              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Chrysaor Bidco S.a r.l.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 1,549     1,561              
Cost 1,549     1,561              
Fair Value 1,556     1,574              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Citrin Cooperman Advisors LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 2,677     4,179              
Cost 2,665     4,173              
Fair Value 2,648     4,196              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Cleanova US Holdings LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 11,096     11,973              
Cost 10,988     11,846              
Fair Value 11,103     11,973              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Cloudera, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 9,550     9,625              
Cost 9,475     9,524              
Fair Value 8,924     9,247              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Clydesdale Acquisition Holdings, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 5,504     5,521              
Cost 5,505     5,523              
Fair Value 5,410     5,525              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Cohnreznick Advisory LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 4,410     5,475              
Cost 4,397     5,463              
Fair Value 4,380     5,513              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Confluence Technologies, Inc. 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 9,525     9,600              
Cost 9,510     9,579              
Fair Value 7,772     8,058              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Confluence Technologies, Inc. 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 943     943              
Cost 943     942              
Fair Value 941     943              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Confluent Health, LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 3,057     3,082              
Cost 3,051     3,074              
Fair Value 2,856     2,758              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Confluent Medical Technologies, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount       6,740              
Cost       6,723              
Fair Value       6,799              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | ConnectWise, LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 6,555     6,606              
Cost 6,561     6,614              
Fair Value 6,450     6,503              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Convey Health Solutions, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 3,484     3,509              
Cost 3,349     3,466              
Fair Value 376     2,562              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | CoreLogic, Inc. (fka First American Corporation, The)                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 6,500                    
Cost 6,374                    
Fair Value 6,167                    
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Cornerstone OnDemand, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 1,795     1,809              
Cost 1,792     1,805              
Fair Value 1,139     1,668              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Cub Financing Intermediate, LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 589                    
Cost 583                    
Fair Value 593                    
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | DG Investment Intermediate Holdings 2, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 8,226     7,283              
Cost 8,208     7,264              
Fair Value 8,247     7,310              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Dayforce Bidco, LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 2,996                    
Cost 2,919                    
Fair Value 2,889                    
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Dealer Tire Financial, LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 10,297     10,376              
Cost 10,259     10,333              
Fair Value 10,215     10,402              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Disco Parent, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount       4,625              
Cost       4,614              
Fair Value       4,660              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Discovery Purchaser Corporation                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 6,816     9,227              
Cost 6,653     8,958              
Fair Value 6,800     8,889              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | EAB Global, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 6,824     6,876              
Cost 6,760     6,801              
Fair Value 6,081     6,131              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Eagle Parent Corp.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 8,775     8,844              
Cost 8,703     8,753              
Fair Value 8,834     8,878              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Eisner Advisory Group LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 6,826     4,976              
Cost 6,761     4,937              
Fair Value 6,823     5,017              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Embecta Corp.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 1,579     1,684              
Cost 1,582     1,688              
Fair Value 1,340     1,689              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | FNZ Group Entities Limited                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 7,161     7,216              
Cost 7,048     7,088              
Fair Value 4,630     5,742              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Finastra USA, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 8,214     8,255              
Cost 8,147     8,181              
Fair Value 7,943     8,097              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | First Advantage Holdings, LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount       1,777              
Cost       1,759              
Fair Value       1,762              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Flash Charm, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 3,898     9,955              
Cost 3,890     9,924              
Fair Value 3,443     9,315              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Forgent Intermediate IV LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount       8,118              
Cost       8,037              
Fair Value       8,077              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Foundational Education Group, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 10,844     10,930              
Cost 10,787     10,852              
Fair Value 10,129     10,105              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Groundworks, LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 6,404     6,452              
Cost 6,375     6,297              
Fair Value 6,412     6,492              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | HIG Finance 2 Limited                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 2,977                    
Cost 2,889                    
Fair Value 2,873                    
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | HIG Operations Holdings, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount       7,123              
Cost       7,123              
Fair Value       7,123              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | HIG Operations Holdings, Inc. 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 7,069                    
Cost 7,069                    
Fair Value 7,069                    
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | HIG Operations Holdings, Inc. 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 1,230                    
Cost 1,224                    
Fair Value 1,229                    
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | HP PHRG Borrower, LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 10,517     10,597              
Cost 10,454     10,527              
Fair Value 10,474     10,553              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Heartland Dental, LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 2,652     9,910              
Cost 2,648     9,886              
Fair Value 2,650     9,963              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Help/Systems Holdings, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 6,002     6,047              
Cost 5,995     6,039              
Fair Value 4,549     5,494              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Houghton Mifflin Harcourt Company                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 8,109     8,172              
Cost 7,953     7,975              
Fair Value 5,524     7,233              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Inizio Group Limited                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 9,702     9,702              
Cost 9,624     9,595              
Fair Value 9,496     9,472              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Jones DesLauriers Insurance Management Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 3,099     1,711              
Cost 3,039     1,707              
Fair Value 3,063     1,715              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Kaseya Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 8,090     8,152              
Cost 8,076     8,135              
Fair Value 6,773     8,169              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Kestra Advisor Services Holdings A, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount       2,280              
Cost       2,277              
Fair Value       2,287              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | KnowBe4, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 4,751     8,761              
Cost 4,751     8,762              
Fair Value 3,369     8,778              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | LSCS Holdings, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 10,119     10,197              
Cost 10,072     10,144              
Fair Value 10,063     10,010              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | LTR Intermediate Holdings, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 5,016     5,041              
Cost 4,993     5,016              
Fair Value 5,035     5,061              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | MED ParentCo, LP                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 6,039     7,291              
Cost 6,017     7,259              
Fair Value 6,036     7,321              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Marcel Bidco LLC (Marcel Bidco GmbH)                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 2,999     2,019              
Cost 2,975     1,996              
Fair Value 2,928     2,032              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Mavis Tire Express Services Topco, Corp.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 8,875     8,493              
Cost 8,831     8,473              
Fair Value 8,802     8,533              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Michael Baker International, LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount       3,829              
Cost       3,829              
Fair Value       3,843              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Michael Baker International, LLC 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 3,800                    
Cost 3,800                    
Fair Value 3,806                    
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Michael Baker International, LLC 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 1,259                    
Cost 1,230                    
Fair Value 1,261                    
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Neon Maple Purchaser Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 2,210     1,477              
Cost 2,213     1,483              
Fair Value 2,153     1,481              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Nexus Buyer LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 8,842     8,909              
Cost 8,802     8,864              
Fair Value 8,761     8,855              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Nielsen Consumer, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 3,654     3,682              
Cost 3,501     3,504              
Fair Value 3,643     3,692              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | OCM System One Buyer CTB, LLC (Sentinel Purchaser II Holdco, LLC)                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 4,823                    
Cost 4,799                    
Fair Value 4,817                    
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | OSTTRA Group Ltd                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 5,622                    
Cost 5,617                    
Fair Value 5,629                    
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | OVG Business Services, LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 1,750     1,763              
Cost 1,742     1,755              
Fair Value 1,759     1,769              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Oceankey (U.S.) II Corp.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 9,167     9,239              
Cost 9,170     9,243              
Fair Value 9,070     9,126              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Orbit Private Holdings I Ltd                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 5,941     5,785              
Cost 5,921     5,763              
Fair Value 5,951     5,816              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Orion Advisor Solutions, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount       955              
Cost       956              
Fair Value       962              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Orion Midco Ltd                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount       5,237              
Cost       5,231              
Fair Value       5,267              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Osaic Holdings, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 3,532     8,883              
Cost 3,532     8,861              
Fair Value 3,504     8,930              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Osmose Utilities Services, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 8,805     8,875              
Cost 8,570     8,543              
Fair Value 8,795     8,742              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Outcomes Group Holdings, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 2,808     2,829              
Cost 2,799     2,819              
Fair Value 2,824     2,850              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Paradigm Parent, LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 398                    
Cost 354                    
Fair Value 372                    
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Pearls (Netherlands) Bidco B.V.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 762     5,679              
Cost 737     5,436              
Fair Value 723     5,150              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Perforce Software, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 3,173     3,198              
Cost 3,163     3,186              
Fair Value 1,629     2,715              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Physician Partners, LLC 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 2,763     1,784              
Cost 2,673     1,740              
Fair Value 2,804     1,492              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Physician Partners, LLC 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 2,147     2,120              
Cost 2,137     2,109              
Fair Value 2,075     1,022              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Pioneer AcquisitionCo, LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 4,013     5,046              
Cost 4,004     5,033              
Fair Value 3,993     5,074              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Planview Parent, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 7,879     7,940              
Cost 7,840     7,876              
Fair Value 6,599     7,641              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Pretium PKG Holdings, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 3,566                    
Cost 3,550                    
Fair Value 3,538                    
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Project Alpha Intermediate Holding, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 9,634     9,708              
Cost 9,508     9,561              
Fair Value 6,809     9,704              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Pushpay USA Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 8,786     8,853              
Cost 8,790     8,858              
Fair Value 7,966     8,858              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Quartz AcquireCo, LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 1,102     1,477              
Cost 1,098     1,472              
Fair Value 960     1,477              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | RealPage, Inc. 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 3,508     1,940              
Cost 3,502     1,938              
Fair Value 3,466     1,941              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | RealPage, Inc. 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 4,063     1,985              
Cost 4,006     1,978              
Fair Value 4,024     1,994              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Rithum Holdings, Inc. (fka CommerceHub, Inc.)                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 9,985     10,061              
Cost 9,921     9,990              
Fair Value 9,421     10,076              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | RxB Holdings, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 3,242     3,283              
Cost 3,185     3,218              
Fair Value 3,246     3,246              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | STATS Intermediate Holdings, LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 6,965                    
Cost 6,740                    
Fair Value 6,904                    
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | STATS Intermediate Holdings, LLC 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount       4,940              
Cost       4,902              
Fair Value       4,868              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | STATS Intermediate Holdings, LLC 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount       2,225              
Cost       2,210              
Fair Value       2,225              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Secretariat Advisors LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 6,249     6,110              
Cost 6,227     6,083              
Fair Value 6,060     6,134              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Secure Acquisition, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 2,580     330              
Cost 2,578     331              
Fair Value 2,588     333              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | SonarSource Financing, LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 6,834     7,100              
Cost 6,744     6,994              
Fair Value 6,663     7,029              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Sovos Compliance, LLC (fka Taxware, LLC)                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 6,660     5,561              
Cost 6,617     5,566              
Fair Value 6,486     5,584              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Spring Education Group, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 10,076     10,154              
Cost 10,001     10,066              
Fair Value 10,086     10,225              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Storable, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 5,547     3,820              
Cost 5,522     3,818              
Fair Value 4,806     3,843              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Summit Acquisition Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 744                    
Cost 743                    
Fair Value 747                    
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Sword Purchaser, LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 2,840                    
Cost 2,705                    
Fair Value 2,838                    
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Symplr Software, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 3,621     3,650              
Cost 3,618     3,646              
Fair Value 3,035     3,109              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | TRC Companies LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount       5,332              
Cost       5,318              
Fair Value       5,355              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Team.blue Finco SARL                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 5,985     7,220              
Cost 5,978     7,205              
Fair Value 5,873     7,267              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Tegra118 Wealth Solutions, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 7,304                    
Cost 7,249                    
Fair Value 7,347                    
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Tempo Acquisition, LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 2,286                    
Cost 1,970                    
Fair Value 1,820                    
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Therapy Brands Holdings LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 5,801     5,847              
Cost 5,792     5,834              
Fair Value 5,801     5,412              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Thermostat Purchaser III, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 8,551     8,617              
Cost 8,547     8,612              
Fair Value 8,430     8,602              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | TransDigm Inc. 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount       1,477              
Cost       1,481              
Fair Value       1,485              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | TransDigm Inc. 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount       886              
Cost       889              
Fair Value       891              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Tricorbraun Holdings, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 7,027     7,082              
Cost 7,005     7,057              
Fair Value 6,738     6,876              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | TruGreen Limited Partnership                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 3,385                    
Cost 3,244                    
Fair Value 3,306                    
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | UKG Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 3,428                    
Cost 3,372                    
Fair Value 3,331                    
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | US Fertility Enterprises, LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 4,747     4,378              
Cost 4,725     4,356              
Fair Value 4,763     4,400              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | VSTG Intermediate Holdings, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 7,027     7,082              
Cost 7,021     7,074              
Fair Value 6,917     7,082              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | VT Topco, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount       6,865              
Cost       6,769              
Fair Value       6,781              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Valcour Packaging, LLC 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 6,943     1,641              
Cost 6,975     1,629              
Fair Value 7,006     1,660              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Valcour Packaging, LLC 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 2,337     2,311              
Cost 2,336     2,311              
Fair Value 1,861     1,804              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Viant Medical Holdings, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 7,686     7,745              
Cost 7,668     7,724              
Fair Value 7,562     7,680              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Xplor T1, LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 10,753     12,569              
Cost 10,710     12,516              
Fair Value 10,404     12,600              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Zelis Cost Management Buyer, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 12,300     12,394              
Cost 12,301     12,395              
Fair Value 12,257     12,316              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Zest Acquisition Corp.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 3,879     3,884              
Cost 3,821     3,822              
Fair Value 3,821     3,884              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Zone Climate Services, Inc. 1                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 9,550     9,625              
Cost 9,495     9,543              
Fair Value 9,454     9,625              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | Zone Climate Services, Inc. 2                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 2,099     2,116              
Cost 2,087     2,098              
Fair Value 2,078     2,116              
SLP IV | Investment, Identifier [Axis]: Funded Investments - First lien | athenahealth Group Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 5,234     4,722              
Cost 5,217     4,717              
Fair Value 5,234     4,737              
SLP IV | Investment, Identifier [Axis]: Largest Portfolio Company Investment                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 18,327     18,217              
SLP IV | Investment, Identifier [Axis]: Top Five Largest Portfolio Company Investments                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 64,843     64,111              
SLP IV | Investment, Identifier [Axis]: Unfunded Investments - First lien | Citrin Cooperman Advisors LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 615     1,364              
Cost (6)     (14)              
Fair Value (9)     6              
SLP IV | Investment, Identifier [Axis]: Unfunded Investments - First lien | Cohnreznick Advisory LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount       791              
Cost       (3)              
Fair Value       5              
SLP IV | Investment, Identifier [Axis]: Unfunded Investments - First lien | HIG Operations Holdings, Inc.                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount       1,236              
Cost       0              
Fair Value       0              
SLP IV | Investment, Identifier [Axis]: Unfunded Investments - First lien | Secretariat Advisors LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 764     742              
Cost 0     0              
Fair Value (23)     3              
SLP IV | Investment, Identifier [Axis]: Unfunded Investments - First lien | US Fertility Enterprises, LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Principal Amount 244     663              
Cost (1)     0              
Fair Value $ 1     $ 3              
[1] New Mountain Finance Corporation (the "Company") generally acquires its investments in private transactions exempt from registration under the Securities Act of 1933, as amended (the "Securities Act"). These investments are generally subject to certain limitations on resale, and may be deemed to be "restricted securities" under the Securities Act.
[2] New Mountain Finance Corporation (the "Company") generally acquires its investments in private transactions exempt from registration under the Securities Act of 1933, as amended (the "Securities Act"). These investments are generally subject to certain limitations on resale, and may be deemed to be "restricted securities" under the Securities Act.
[3] The fair value of the Company's investment is determined using unobservable inputs that are significant to the overall fair value measurement. See Note 4. Fair Value, for details
[4] Investment is held by New Mountain Finance Corporation.
[5] The Company holds ordinary shares in AAC Lender Holdings, LLC and two first lien term loans, a first lien revolver and subordinated notes in American Achievement Corporation, a partially-owned subsidiary of AAC Lender Holdings, LLC.
[6] The Company holds ordinary shares in AAC Lender Holdings, LLC and two first lien term loans, a first lien revolver and subordinated notes in American Achievement Corporation, a partially-owned subsidiary of AAC Lender Holdings, LLC.
[7] The fair value of the Company's investment is determined using unobservable inputs that are significant to the overall fair value measurement. See Note 4. Fair Value, for details.
[8] Investment is held by New Mountain Finance Corporation
[9] Par amount is denominated in United States Dollar unless otherwise noted, which may include British Pound ("£") and/or Euro ("€")
[10] Par value amounts represent the drawn or undrawn (as indicated in type of investment) portion of revolvers or delayed draws. Cost amounts represent the cash received at settlement date net of the impact of paydowns and cash paid for drawn revolvers or delayed draws
[11] Par amount is denominated in United States Dollar unless otherwise noted, which may include British Pound ("£") and/or Euro ("€").
[12] Par value amounts represent the drawn or undrawn (as indicated in type of investment) portion of revolvers or delayed draws. Cost amounts represent the cash received at settlement date net of the impact of paydowns and cash paid for drawn revolvers or delayed draws.
[13] Investment is held by New Mountain Finance SBIC, L.P.
[14] Investment is pledged as collateral for the Holdings Credit Facility, a revolving credit facility among the Company, as the Collateral Manager, New Mountain Finance Holdings, L.L.C. as the Borrower, Wells Fargo Securities, LLC, as the Administrative Agent, and Wells Fargo Bank, National Association, as the Lender and Collateral Custodian. See Note 7. Borrowings, for details.
[15] Investment is held by New Mountain Finance Holdings, L.L.C.
[16] Investment is pledged as collateral for the NMFC Credit Facility, a revolving credit facility among the Company as the Borrower, Sumitomo Mitsui Banking Corporation, as administrative agent, sole lead arranger, and sole book runner, and the lenders party thereto. See Note 7. Borrowings, for details.
[17] Investment is pledged as collateral for the Holdings Credit Facility, a revolving credit facility among the Company, as the Collateral Manager, New Mountain Finance Holdings, L.L.C., as the Borrower, Wells Fargo Securities, LLC, as the Administrative Agent, and Wells Fargo Bank, National Association, as the Lender and Collateral Custodian. See Note 7. Borrowings, for details
[18] Investment is held by New Mountain Finance Holdings, L.L.C.
[19] Investment is held by New Mountain Finance SBIC, L.P.
[20] Investment is pledged as collateral for the NMFC Credit Facility, a revolving credit facility among the Company, as the Borrower, Sumitomo Mitsui Banking Corporation, as Administrative Agent, sole Book Runner and Joint Lead Arrangers along with Deutsche Bank Securities Inc., State Street Bank and Trust Company and Wells Fargo Securities, LLC, and the lenders party thereto. See Note 7. Borrowings, for details.
[21] The Company holds investments in ACI Parent Inc. and a wholly-owned subsidiary of ACI Parent Inc. The Company holds a first lien term loan, two first lien delayed draws and a first lien revolver in ACI Group Holdings, Inc. and preferred equity in ACI Parent Inc. . The Company's preferred equity investment is entitled to receive cumulative preferred dividends that are calculated using the stated value of the Company's equity investment plus the aggregate unpaid compounded dividends as of the date of determination. As of December 31, 2025, the Company's stated value of its equity investment, plus unpaid compounded dividends, was $20,249.
[22] Indicates assets that the Company deems to be “non-qualifying assets” under Section 55(a) of the 1940 Act. Qualifying assets must represent at least 70.0% of the Company’s total assets at the time of acquisition of any additional non-qualifying assets. As of December 31, 2025, 15.4% of the Company’s total assets are represented by investments at fair value that are considered non-qualifying assets.
[23] Indicates assets that the Company deems to be “non-qualifying assets” under Section 55(a) of the 1940 Act. Qualifying assets must represent at least 70.0% of the Company’s total assets at the time of acquisition of any additional non-qualifying assets. As of September 30, 2026, 19.9% of the Company’s total assets are represented by investments at fair value that are considered non-qualifying assets.
[24] Investment is held by New Mountain Finance SBIC II, L.P.
[25] Investment is held by New Mountain Finance SBIC II, L.P.
[26] The Company's preferred equity investment in Dealer Tire Holdings, LLC is entitled to receive cumulative preferred dividends that are calculated using the stated value of the Company's equity investment plus the aggregate unpaid compounded dividends as of the date of determination. As of September 30, 2026, the Company's stated value of its equity investment, plus unpaid compounded dividends, was $27,116.
[27] The Company's preferred equity investment in Dealer Tire Holdings, LLC is entitled to receive cumulative preferred dividends that are calculated using the stated value of the Company's equity investment plus the aggregate unpaid compounded dividends as of the date of determination. As of December 31, 2025, the Company's stated value of its share, plus unpaid compounded dividends, was $90,671.
[28] The Company holds investments in two wholly-owned subsidiaries of Diamond Parent Holdings Corp. The Company holds two first lien term loans, a first lien delayed draw and a first lien revolver in Diligent Corporation and preferred equity in Diligent Preferred Issuer Inc. The Company's preferred equity investment is entitled to receive cumulative preferred dividends that are calculated using the stated value of the Company's equity investment plus the aggregate unpaid compounded dividends as of the date of determination. As of December 31, 2025, the Company's stated value of its equity investment, plus unpaid compounded dividends, was $15,827.
[29] Denotes investments in which the Company is an “Affiliated Person”, as defined in the Investment Company Act of 1940, as amended (the "1940 Act"), due to owning or holding the power to vote 5.0% or more of the outstanding voting securities of the investment but not controlling the company. Fair value as of September 30, 2026 and December 31, 2025, along with transactions during the nine months ended September 30, 2026 in which the issuer was a non-controlled/affiliated investment, is as follows:
Portfolio CompanyFair Value at December 31, 2025Gross Additions (A)Gross Redemptions (B)Net Change In Unrealized Appreciation (Depreciation)Fair Value at September 30, 2026Net Realized Gains (Losses)Interest IncomeDividend IncomeOther Income
Eagle Infrastructure Services, LLC (fka FR Arsenal Holdings II Corp.) / Eagle Infrastructure Super HoldCo, LLC$18,337 $— $— $4,311 $22,648 $— $944 $1,423 $— 
Sierra Hamilton Holdings Corporation2,000 — — (111)1,889 — — — — 
TVG-Edmentum Holdings, LLC / Edmentum Ultimate Holdings, LLC40,365 4,804 — (14)45,155 — 3,789 1,019 188 
Total Non-Controlled/Affiliated Investments$60,702 $4,804 $— $4,186 $69,692 $— $4,733 $2,442 $188 
(A)Gross additions include increases in the cost basis of investments resulting from new portfolio investments, payment-in-kind (“PIK”) interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement of an existing portfolio company into this category from a different category.
(B)Gross redemptions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[30] Denotes investments in which the Company is an “Affiliated Person”, as defined in the Investment Company Act of 1940, as amended (the "1940 Act"), due to owning or holding the power to vote 5.0% or more of the outstanding voting securities of the investment but not controlling the company. Fair value as of December 31, 2025 and December 31, 2024 along with transactions during the year ended December 31, 2025 in which the issuer was a non-controlled/affiliated investment is as follows:
Portfolio CompanyFair Value at December 31, 2024Gross
Additions (A)		Gross
Redemptions
(B)		Net Change In Unrealized Appreciation (Depreciation)Fair Value at December 31, 2025Net Realized Gains (Losses)Interest
Income		Dividend
Income		Other
Income
Eagle Infrastructure Services, LLC (fka FR Arsenal Holdings II Corp.) / Eagle Infrastructure Super HoldCo, LLC$19,156 $— $— $(819)$18,337 $— $1,321 $— $— 
Sierra Hamilton Holdings Corporation2,000 — — — 2,000 — — — — 
TVG-Edmentum Holdings, LLC / Edmentum Ultimate Holdings, LLC91,620 6,967 — (58,222)40,365 — 4,357 2,594 250 
Total Non-Controlled/Affiliated Investments$112,776 $6,967 $— $(59,041)$60,702 $— $5,678 $2,594 $250 
(A)Gross additions include increases in the cost basis of investments resulting from new portfolio investments, payment-in-kind (“PIK”) interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement of an existing portfolio company into this category from a different category.
(B)Gross redemptions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[31] The Company holds preferred equity in Eclipse Topco, Inc. and a first lien term loan and a first lien revolver in Eclipse Buyer, Inc., a wholly-owned subsidiary of Eclipse Topco, Inc. The Company's preferred equity investment is entitled to receive cumulative preferred dividends that are calculated using the stated value of the Company's equity investment plus the aggregate unpaid compounded dividends as of the date of determination. As of September 30, 2026, the Company's stated value of its equity investment, plus unpaid compounded dividends, was $1,632.
[32] The Company holds preferred equity in Eclipse Topco, Inc. and a first lien term loan, a first lien revolver and a first lien delayed draw in Eclipse Buyer, Inc., a wholly-owned subsidiary of Eclipse Topco, Inc. The Company's preferred equity investment is entitled to receive cumulative preferred dividends that are calculated using the stated value of the Company's equity investment plus the aggregate unpaid compounded dividends as of the date of determination. As of December 31, 2025, the Company's stated value of its equity investment, plus unpaid compounded dividends, was $2,226.
[33] The Company holds Series C-2 preferred units and Class B-1 and Class B-2 of common equity in TVG-Edmentum Holdings, LLC and subordinated notes in Edmentum Ultimate Holdings, LLC, a wholly-owned subsidiary of TVG-Edmentum Holdings, LLC. As of September 30, 2026, the Company's stated value of its Series C-2 preferred shares, Class B-1 and Class B-2 common equity investments, plus unpaid compounded dividends, was $9,737, $48,080 and $29,707, respectively.
[34] The Company holds ordinary shares and Class B-1 and B-2 of preferred equity in TVG-Edmentum Holdings, LLC, and subordinated notes in Edmentum Ultimate Holdings, LLC, a wholly-owned subsidiary of TVG-Edmentum Holdings, LLC. As of December 31, 2025, the Company's stated value of the Company's Class B-1 and Class B-2 preferred equity investments, plus unpaid compounded dividends, was $48,080 and $29,707, respectively.
[35] The Company holds ordinary shares in FS WhiteWater Holdings, LLC, and a first lien term loan, a first lien revolver, and five first lien delayed draws in FS WhiteWater Borrower, LLC, a partially-owned subsidiary of FS WhiteWater Holdings, LLC.
[36] The Company holds ordinary shares in FS WhiteWater Holdings, LLC, and a first lien term loan, a first lien revolver, and five first lien delayed draws in FS WhiteWater Borrower, LLC, a partially-owned subsidiary of FS WhiteWater Holdings, LLC.
[37] The Company holds an LP Interest in Firebird Co-Invest L.P. and a first lien term loan, a first lien delayed draw and a first lien revolver in Firebird Acquisition Corp, Inc., a wholly-owned subsidiary of Firebird Co-Invest L.P.
[38] The Company holds an LP Interest in Firebird Co-Invest L.P. and holds a first lien term loan, a first lien delayed and a first lien revolver in Firebird Acquisition Corp, Inc., a wholly-owned subsidiary of Firebird Co-Invest L.P.
[39] The Company's common equity investment in HBWM Holdings, LLC is entitled to receive a cumulative return that is calculated using the unreturned original investment plus any unpaid compounded dividends. As of September 30, 2026, the Company's unreturned original investment, plus any unpaid compounded dividends, was $4,827.
[40] Investment is held by NMF HB, Inc.
[41] The Company's common equity investment in HBWM Holdings, LLC. is entitled to receive cumulative return that are calculated using the unreturned original investment plus any unpaid capitalized dividends. As of December 31, 2025, the Company's unreturned original investment, plus any unpaid compounded dividends, was $4,776.
[42] Investment is held by NMF HB, Inc.
[43] The Company holds Class A-1 common units in Jawbreaker Topco, L.P., and two first lien term loans, a first lien delayed draw term loan and a first lien revolver in Jawbreaker Parent, Inc., a wholly-owned subsidiary of Jawbreaker Topco, L.P.
[44] The Company's preferred equity investment in Knockout Intermediate Holdings I Inc. is entitled to receive cumulative preferred dividends that are calculated using the stated value of the Company's equity investment plus the aggregate unpaid compounded dividends as of the date of determination. As of September 30, 2026, the Company's stated value of its equity investment, plus unpaid compounded dividends, was $14,279.
[45] The Company's preferred equity investment in Knockout Intermediate Holdings I, Inc. is entitled to receive cumulative preferred dividends that are calculated using the stated value of the Company's equity investment plus the aggregate unpaid compounded dividends as of the date of determination. As of December 31, 2025, the Company's stated value of its share, plus unpaid compounded dividends, was $13,323.
[46] The Company holds ordinary shares and warrants in NHME Holdings Corp., as well as a second lien Tranche A Term Loan in National HME, Inc., a wholly-owned subsidiary of NHME Holdings Corp. The second lien Tranche A Term Loan is entitled to receive 20% of the interest earned on the first lien Tranche A Term Loan, which accrues interest at a rate of SOFR + 5.00%, and 20% of the interest earned on the first lien Tranche B Term Loan, which accrues interest at a rate of SOFR + 6.00%.
[47] Denotes investments in which the Company “Controls”, as defined in the 1940 Act, due to owning or holding the power to vote more than 25.0% of the outstanding voting securities of the investment. Fair value as of December 31, 2025 and December 31, 2024 along with transactions during the year ended December 31, 2025 in which the issuer was a controlled investment, is as follows:
Portfolio CompanyFair Value at December 31, 2024Gross
Additions
(A)		Gross
Redemptions
(B)		Net Change In
Unrealized
Appreciation
(Depreciation)		Fair Value at December 31, 2025Net Realized Gains (Losses)Interest
Income		Dividend
Income		Other
Income
National HME, Inc./NHME Holdings Corp.$3,000 $— $— $(3,000)$— $— $— $— $— 
New Benevis Topco, LLC / New Benevis Holdco, Inc.140,102 21,456 — (7,094)154,464 — 14,309 — 1,383 
New Permian Holdco, Inc. / New Permian Holdco, L.L.C.63,076 7,657 — (6,900)63,833 — 5,759 — 500 
NM NL Holdings, L.P.104,512 — — 1,584 106,096 — — 8,740 — 
NM GP Holdco, LLC322 — — 68 390 — — 44 — 
NM YI LLC9,960 — — (1,319)8,641 — — 886 — 
NMFC Senior Loan Program III LLC160,000 — — — 160,000 — — 22,600 — 
NMFC Senior Loan Program IV LLC112,400 — — — 112,400 — — 15,315 — 
UniTek Global Services, Inc.107,524 72,385 (60,582)(46,146)73,181 38,898 516 10,851 1,070 
Total Controlled Investments$700,896 $101,498 $(60,582)$(62,807)$679,005 $38,898 $20,584 $58,436 $2,953 

(A)Gross additions include increases in the cost basis of investments resulting from new portfolio investments, PIK interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement of an existing portfolio company into this category from a different category.
(B)Gross redemptions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[48] Investment is held by New Mountain Net Lease Corporation.
[49] Denotes investments in which the Company "controls", as defined in the 1940 Act, due to owning or holding the power to vote more than 25.0% of the outstanding voting securities of the investment. Fair value as of September 30, 2026 and December 31, 2025, along with transactions during the nine months ended September 30, 2026 in which the issuer was a controlled investment, is as follows:
Portfolio CompanyFair Value at December 31, 2025Gross Additions (A)Gross Redemptions (B)Net Change In Unrealized Appreciation (Depreciation)Fair Value at September 30, 2026Net Realized Gains (Losses)Interest IncomeDividend IncomeOther Income
National HME, Inc./NHME Holdings Corp.$— $— $(12,872)$12,872 $— $(12,872)$— $— $— 
New Benevis Topco, LLC / New Benevis Holdco, Inc.154,464 8,931 (76,831)5,185 91,749 (5,718)6,855 — — 
New Permian Holdco, Inc. / New Permian Holdco, L.L.C.63,833 4,561 — (1,000)67,394 — 4,563 — 375 
NM NL Holdings, L.P.106,096 5,926 (6,972)6,909 111,959 (3)— 6,601 185 
NM GP Holdco, LLC390 75 (64)5 406 — — 33 — 
NM YI, LLC8,641 — — 143 8,784 — — 697 — 
NMFC Senior Loan Program III LLC160,000 — — (4,800)155,200 — — 14,260 — 
NMFC Senior Loan Program IV LLC112,400 — — (10,116)102,284 — — 9,695 — 
UniTek Global Services, Inc.73,181 10,164 — 9,739 93,084 — — 10,164 750 
Total Controlled Investments$679,005 $29,657 $(96,739)$18,937 $630,860 $(18,593)$11,418 $41,450 $1,310 
(A)Gross additions include increases in the cost basis of investments resulting from new portfolio investments, PIK interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement of an existing portfolio company into this category from a different category.
(B)Gross redemptions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[50] Investment is held by New Mountain Net Lease Corporation.
[51] Investment is denominated in foreign currency and is translated into U.S. dollars as of the valuation date. As of December 31, 2025, the par value U.S. dollar equivalent of the Viper Bidco, Inc. first lien term loans is $16,051 and the Nelipak Holding Company first lien term loan, undrawn delayed draw term loan, undrawn revolver and drawn revolver is $19,212, $7,529, $1,282 and $123, respectively. See Note 2. Summary of Significant Accounting Policies, for details.
[52] Investment is denominated in foreign currency and is translated into U.S. dollars as of the valuation date. As of September 30, 2026, the par value U.S. dollar equivalent of the Viper Bidco, Inc. first lien term loan is $15,686 and the Nelipak Holding Company first lien term loan, undrawn delayed draw term loan and undrawn revolver are $18,398, $7,264 and $1,355, respectively. See Note 2. Summary of Significant Accounting Policies, for details.
[53] The Company holds common stock in Notorious Buyer, LLC, and a first lien term loan, a subordinated loan, and a first lien revolver in Notorious Topco, LLC and Notorious Holdings, LLC, two wholly-owned subsidiaries of Notorious Buyer, LLC.
[54] The Company holds common units in Notorious Buyer, LLC, and a first lien term loan, a subordinated loan, and a first lien revolver in Notorious Topco, LLC and Notorious Holdings, LLC, two wholly-owned subsidiaries of Notorious Buyer, LLC.
[55] The Company holds one claim related to a collateralized agreement to resell on its Consolidated Statements of Assets and Liabilities with a cost basis of $30,000 and a fair value of $5,700 as of September 30, 2026. See Note 2. Summary of Significant Accounting Policies, for details.
[56] Investment is on non-accrual status as of December 31, 2025. See Note 3. Investments, for details.
[57] The Company holds one security purchased under a collateralized agreement to resell on its Consolidated Statement of Assets and Liabilities with a cost basis of $30,000 and a fair value of $13,500 as of December 31, 2025. See Note 2. Summary of Significant Accounting Policies, for details.
[58] Investment is held by NMF Permian Holdings, LLC.
[59] Investment is held by NMF Permian Holdings, LLC.
[60] Investment is held by NMF Pioneer, Inc.
[61] Investment is held by NMF Pioneer, Inc.
[62] The Company holds Class A-1 Common Units in Ambrosia Holdco Corp. and two first lien term loans, two subordinated loans and a first lien delayed draw in TMK Hawk Parent, Corp. TMK Hawk Parent, Corp. is a wholly-owned subsidiary of Ambrosia Intermediate Holdco Corp., which is a wholly-owned subsidiary of Ambrosia Holdco Corp
[63] The Company holds Class A-1 Common Units in Ambrosia Topco LLC and two first lien term loans, a subordinated loan and a first lien delayed draw in TMK Hawk Parent, Corp., a wholly-owned subsidiary of Ambrosia Topco LLC.