v3.25.2
Fair Value of Financial Instruments - Schedule of SLF’s Portfolio (Details)
$ in Thousands
Jun. 30, 2025
USD ($)
portfolioCompany
Dec. 31, 2024
USD ($)
portfolioCompany
Dec. 31, 2023
USD ($)
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Total assets $ 4,289,541 $ 4,168,998  
Fair Value 4,083,453 [1],[2],[3] 3,966,075 [4],[5],[6]  
Investment, Identifier [Axis]: 1236904 BC, Ltd., Software/Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8] 14,332    
Investment, Identifier [Axis]: 1236904 BC, Ltd., Software/Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 17,022 [7],[8],[9] 14,846 [10],[11]  
Investment, Identifier [Axis]: 1236904 BC, Ltd., Software/Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11],[12]   17,431  
Investment, Identifier [Axis]: ADCS Clinics Intermediate Holdings, LLC , Healthcare 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8] 3,845    
Investment, Identifier [Axis]: ADCS Clinics Intermediate Holdings, LLC , Healthcare 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8] 123    
Investment, Identifier [Axis]: ADCS Clinics Intermediate Holdings, LLC , Healthcare 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] 141    
Investment, Identifier [Axis]: ADCS Clinics Intermediate Holdings, LLC , Healthcare 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8] 18,756    
Investment, Identifier [Axis]: ADCS Clinics Intermediate Holdings, LLC, Healthcare 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11]   124  
Investment, Identifier [Axis]: ADCS Clinics Intermediate Holdings, LLC, Healthcare 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   141  
Investment, Identifier [Axis]: ADCS Clinics Intermediate Holdings, LLC, Healthcare 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   3,865  
Investment, Identifier [Axis]: ADCS Clinics Intermediate Holdings, LLC, Healthcare 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   18,854  
Investment, Identifier [Axis]: AIG CLO, Ltd. 21-1A F, Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,320 1,287  
Investment, Identifier [Axis]: AP Gaming I, LLC , Gaming/Lodging      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   7,114  
Investment, Identifier [Axis]: ARC Falcon I, Inc., Chemicals      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,999    
Investment, Identifier [Axis]: Accel International Holdings, LLC , Industrials 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] (23)    
Investment, Identifier [Axis]: Accel International Holdings, LLC , Industrials 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8],[9] 27,549    
Investment, Identifier [Axis]: Acrisure, LLC , Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   17,223  
Investment, Identifier [Axis]: Acrisure, LLC / Finance, Inc., Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,798    
Investment, Identifier [Axis]: Acrisure, LLC, Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 7,178    
Investment, Identifier [Axis]: Adelaide Borrower, LLC , Software/Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] 0    
Investment, Identifier [Axis]: Adelaide Borrower, LLC , Software/Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] 0    
Investment, Identifier [Axis]: Adelaide Borrower, LLC , Software/Services 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8],[9] 35,285    
Investment, Identifier [Axis]: Adelaide Borrower, LLC, Software/Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11],[12]   34,652  
Investment, Identifier [Axis]: Adelaide Borrower, LLC, Software/Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   (142)  
Investment, Identifier [Axis]: Adelaide Borrower, LLC, Software/Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   (89)  
Investment, Identifier [Axis]: Adtalem Global Education, Inc. , Education 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   585  
Investment, Identifier [Axis]: Adtalem Global Education, Inc. , Education 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   1,020  
Investment, Identifier [Axis]: Adtalem Global Education, Inc., Education      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 353    
Investment, Identifier [Axis]: Air Canada, Transportation      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,980 4,861  
Investment, Identifier [Axis]: Albion Financing 3 SARL , Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,037 3,076  
Investment, Identifier [Axis]: Alera Group Intermediate Holdings, Inc., Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   4,686  
Investment, Identifier [Axis]: Alera Group Intermediate Holdings, Inc., Financials 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   8,609  
Investment, Identifier [Axis]: Alera Group Intermediate Holdings, Inc., Financials 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   17,267  
Investment, Identifier [Axis]: Alera Group, Inc. , Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[9] 22,598    
Investment, Identifier [Axis]: Alera Group, Inc., Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 7,801    
Investment, Identifier [Axis]: Alliant Holdings Intermediate, LLC , Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   4,995  
Investment, Identifier [Axis]: Alpha Generation, LLC, Utilities      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   5,311  
Investment, Identifier [Axis]: Altice Financing, SA , Telecom      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   1,565  
Investment, Identifier [Axis]: Altice France, SA , Telecom      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   9,880  
Investment, Identifier [Axis]: Alvogen Pharma US, Inc. , Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 578 9,692  
Investment, Identifier [Axis]: Amentum Government Services Holdings, LLC , Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   8,536  
Investment, Identifier [Axis]: American Airlines Inc/AAdvantage Loyalty IP, Ltd., Transportation      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   4,575  
Investment, Identifier [Axis]: American Builders & Contractors Supply Co., Inc., Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   1,909  
Investment, Identifier [Axis]: American Rock Salt Company, LLC , Chemicals      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   5,411  
Investment, Identifier [Axis]: American Rock Salt Company, LLC, Chemicals      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,612 [7] 1,796 [10]  
Investment, Identifier [Axis]: American Rock Salt Company, LLC, Chemicals 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,238 [7],[8] 1,749  
Investment, Identifier [Axis]: American Rock Salt Company, LLC, Chemicals 1.1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,693    
Investment, Identifier [Axis]: Amylu Borrower Sub, LLC , Food & Beverage 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] (67)    
Investment, Identifier [Axis]: Amylu Borrower Sub, LLC, Food & Beverage 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] 486    
Investment, Identifier [Axis]: Amylu Borrower Sub, LLC, Food & Beverage 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8] 39,142    
Investment, Identifier [Axis]: Anchor Glass Container Corp., Paper & Packaging      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,124 [8],[15] 2,921 [11],[16]  
Investment, Identifier [Axis]: Apollo Commercial Real Estate Finance, Inc. , Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   2,599  
Investment, Identifier [Axis]: Apollo Commercial Real Estate Finance, Inc., Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,847    
Investment, Identifier [Axis]: Arch Global Precision, LLC , Industrials 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,296 [8] 2,308 [11]  
Investment, Identifier [Axis]: Arch Global Precision, LLC , Industrials 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] 901    
Investment, Identifier [Axis]: Arch Global Precision, LLC , Industrials 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8],[9] 7,288    
Investment, Identifier [Axis]: Arch Global Precision, LLC, Industrials 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   992  
Investment, Identifier [Axis]: Arch Global Precision, LLC, Industrials 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11],[12]   7,326  
Investment, Identifier [Axis]: Arches Buyer, Inc. , Publishing      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,866 5,829  
Investment, Identifier [Axis]: Arcline FM Holdings, LLC , Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,020    
Investment, Identifier [Axis]: Arcosa, Inc. , Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   1,309  
Investment, Identifier [Axis]: Arctic Holdco, LLC , Paper & Packaging      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   3,926  
Investment, Identifier [Axis]: Arctic Holdco, LLC , Paper & Packaging 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,210 [8],[13] 59,404 [10],[11],[12]  
Investment, Identifier [Axis]: Arctic Holdco, LLC , Paper & Packaging 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] 1,232    
Investment, Identifier [Axis]: Arctic Holdco, LLC , Paper & Packaging 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8],[9] 45,720    
Investment, Identifier [Axis]: Armada Parent, Inc, Industrials 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11],[14]   3,203  
Investment, Identifier [Axis]: Armada Parent, Inc. , Industrials 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] 1,618    
Investment, Identifier [Axis]: Armada Parent, Inc. , Industrials 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   63,569  
Investment, Identifier [Axis]: Armada Parent, Inc. , Industrials 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8] 55,500    
Investment, Identifier [Axis]: Armada Parent, Inc., Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   0  
Investment, Identifier [Axis]: Armada Parent, Inc., Industrials 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] (19)    
Investment, Identifier [Axis]: Artera Services, LLC , Utilities      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,627 5,519  
Investment, Identifier [Axis]: Artifact Bidco, Inc. Software/Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   (18)  
Investment, Identifier [Axis]: Artifact Bidco, Inc., Software/Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11],[12]   10,773  
Investment, Identifier [Axis]: Artifact Bidco, Inc., Software/Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [8],[13] (25) [11],[14]  
Investment, Identifier [Axis]: Artifact Bidco, Inc., Software/Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] 0    
Investment, Identifier [Axis]: Artifact Bidco, Inc., Software/Services 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8],[9] 10,875    
Investment, Identifier [Axis]: Aruba Investments Holdings, LLC, Chemicals      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,604 [8],[9] 3,604 [11],[12]  
Investment, Identifier [Axis]: Ascend Learning, LLC , Education      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,994    
Investment, Identifier [Axis]: Ascensus Group Holdings, Inc. , Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 7,512 7,601  
Investment, Identifier [Axis]: Astoria Energy, LLC , Utilities      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   1,733  
Investment, Identifier [Axis]: Asurion, LLC , Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   4,012  
Investment, Identifier [Axis]: Athenahealth Group, Inc. , Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 9,959 12,704  
Investment, Identifier [Axis]: Athletico Management, LLC Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   3,739  
Investment, Identifier [Axis]: Athletico Management, LLC , Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,296    
Investment, Identifier [Axis]: AuditBoard, Inc. , Software/Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8] 22,887    
Investment, Identifier [Axis]: AuditBoard, Inc. , Software/Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] 0    
Investment, Identifier [Axis]: AuditBoard, Inc. , Software/Services 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] 0    
Investment, Identifier [Axis]: AuditBoard, Inc., Software/Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11]   22,674  
Investment, Identifier [Axis]: AuditBoard, Inc., Software/Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   (101)  
Investment, Identifier [Axis]: AuditBoard, Inc., Software/Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   (41)  
Investment, Identifier [Axis]: Avalara, Inc. , Software/Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,021    
Investment, Identifier [Axis]: Avalara, Inc., Software/Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   0  
Investment, Identifier [Axis]: Avalara, Inc., Software/Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   60,192  
Investment, Identifier [Axis]: Avaya Holdings Corp., Technology      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,973 2,149  
Investment, Identifier [Axis]: Avaya Holdings Corp., Technology 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 671 528  
Investment, Identifier [Axis]: Avaya Holdings Corp., Technology 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 132 104  
Investment, Identifier [Axis]: Aventine Holdings, LLC , Media/Entertainment      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   16,153  
Investment, Identifier [Axis]: Aventine Holdings, LLC , Media/Entertainment 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8] 16,386    
Investment, Identifier [Axis]: Aventine Holdings, LLC , Media/Entertainment 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 41,393 [7],[8],[9] 37,531 [10],[11]  
Investment, Identifier [Axis]: Aventine Holdings, LLC, Media/Entertainment      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8] 39,455    
Investment, Identifier [Axis]: Aventine Holdings, LLC, Media/Entertainment 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11],[12]   40,802  
Investment, Identifier [Axis]: Axiom Global, Inc. , Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8],[9] 46,896    
Investment, Identifier [Axis]: Axiom Global, Inc., Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[12]   45,600  
Investment, Identifier [Axis]: Azurite Intermediate Holdings, Inc. , Software/Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8] 9,961    
Investment, Identifier [Axis]: Azurite Intermediate Holdings, Inc. , Software/Services 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] 0    
Investment, Identifier [Axis]: Azurite Intermediate Holdings, Inc., Software/Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   0  
Investment, Identifier [Axis]: Azurite Intermediate Holdings, Inc., Software/Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11]   9,961  
Investment, Identifier [Axis]: Azurite Intermediate Holdings, Inc., Software/Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 22,639 [8] 22,639 [11]  
Investment, Identifier [Axis]: BCPE Oceandrive Buyer, Inc. , Healthcare 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[15] 2,221    
Investment, Identifier [Axis]: BCPE Oceandrive Buyer, Inc. , Healthcare 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8],[15] 1,165    
Investment, Identifier [Axis]: BCPE Oceandrive Buyer, Inc. , Healthcare 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8],[9],[15] 13,758    
Investment, Identifier [Axis]: BCPE Oceandrive Buyer, Inc. , Healthcare 6      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8] 4,985    
Investment, Identifier [Axis]: BCPE Oceandrive Buyer, Inc., Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[16]   2,641  
Investment, Identifier [Axis]: BCPE Oceandrive Buyer, Inc., Healthcare 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11],[12],[16]   2,717  
Investment, Identifier [Axis]: BCPE Oceandrive Buyer, Inc., Healthcare 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11],[16]   1,380  
Investment, Identifier [Axis]: BCPE Oceandrive Buyer, Inc., Healthcare 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,293 [7],[8],[9],[15] 16,302 [10],[11],[12],[16]  
Investment, Identifier [Axis]: BCPE Oceandrive Buyer, Inc., Healthcare 5      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] 0    
Investment, Identifier [Axis]: Baldwin Insurance Group Holdings, LLC , Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,490 3,526  
Investment, Identifier [Axis]: Bally's Corp., Gaming/Lodging      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   3,492  
Investment, Identifier [Axis]: Battalion CLO, Ltd. 21-17A F, Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 865 1,023  
Investment, Identifier [Axis]: Beach Acquisition Bidco, LLC , Consumer      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,457    
Investment, Identifier [Axis]: Bella Holding Co., LLC , Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 8,089    
Investment, Identifier [Axis]: Bella Holding Co., LLC, Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   8,149  
Investment, Identifier [Axis]: Belron Finance 2019, LLC , Transportation      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,777 5,833  
Investment, Identifier [Axis]: Berlin Packaging, LLC , Paper & Packaging      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   3,048  
Investment, Identifier [Axis]: Big Apple Advisory, LLC , Business Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] (208)    
Investment, Identifier [Axis]: Big Apple Advisory, LLC , Business Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] (58)    
Investment, Identifier [Axis]: Big Apple Advisory, LLC , Business Services 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8],[9] 46,973    
Investment, Identifier [Axis]: Big Apple Advisory, LLC, Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11],[12]   47,055  
Investment, Identifier [Axis]: Big Apple Advisory, LLC, Business Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   (225)  
Investment, Identifier [Axis]: Big Apple Advisory, LLC, Business Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   (63)  
Investment, Identifier [Axis]: Bingo Group Buyer, Inc. , Utilities 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8],[9] 5,437    
Investment, Identifier [Axis]: Bingo Group Buyer, Inc., Utilities 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] 20    
Investment, Identifier [Axis]: Bingo Group Buyer, Inc., Utilities      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   5,401  
Investment, Identifier [Axis]: Bingo Group Buyer, Inc., Utilities 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 229 [8],[13] (20) [11],[14]  
Investment, Identifier [Axis]: Bingo Group Buyer, Inc., Utilities 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   12  
Investment, Identifier [Axis]: Black Mountain Sand, LLC, Energy      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,305 [8],[17],[18] 1,305 [11],[19],[20]  
Investment, Identifier [Axis]: Blackhawk Network Holdings, Inc. , Consumer      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,973 5,030  
Investment, Identifier [Axis]: Blackstone CQP Holdco, LP , Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,938 12,367  
Investment, Identifier [Axis]: Broadstreet Partners, Inc. , Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   1,855  
Investment, Identifier [Axis]: Brown Group Holding, LLC , Other      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   2,999  
Investment, Identifier [Axis]: Brown Group Holding, LLC, Other      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,978    
Investment, Identifier [Axis]: CCI Buyer, Inc. , Telecom      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   7,420  
Investment, Identifier [Axis]: CCI Buyer, Inc. , Telecom 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] (30)    
Investment, Identifier [Axis]: CCI Buyer, Inc., Telecom 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8],[9] 51,747    
Investment, Identifier [Axis]: CD&R Hydra Buyer, Inc. , Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   6,265  
Investment, Identifier [Axis]: CD&R Hydra Buyer, Inc., Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,114    
Investment, Identifier [Axis]: CNT Holdings I Corp. , Consumer      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   3,388  
Investment, Identifier [Axis]: CNT Holdings I Corp. , Consumer      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,368    
Investment, Identifier [Axis]: CPV Shore Holdings, LLC , Utilities      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   1,978  
Investment, Identifier [Axis]: CRS-SPV, Inc. , Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[18],[21],[22] 2,008    
Investment, Identifier [Axis]: CRS-SPV, Inc., Equity/Other Investments      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,008 1,704 $ 0
Investment, Identifier [Axis]: CRS-SPV, Inc., Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[20],[23],[24]   1,704  
Investment, Identifier [Axis]: CRS-SPV, Inc., Senior Secured First Lien Debt      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   0 0
Investment, Identifier [Axis]: Cablevision Lightpath, LLC , Telecom      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   2,815  
Investment, Identifier [Axis]: Cablevision Lightpath, LLC, Telecom      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,894    
Investment, Identifier [Axis]: Caesars Entertainment, Inc. , Gaming/Lodging      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,966 8,742  
Investment, Identifier [Axis]: Calpine Construction Finance Co., LP , Utilities      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   2,486  
Investment, Identifier [Axis]: Camelot Return Merger Sub, Inc., Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,270    
Investment, Identifier [Axis]: Capstone Acquisition Holdings, Inc. , Transportation 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] 0    
Investment, Identifier [Axis]: Capstone Acquisition Holdings, Inc. , Transportation 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8] 20,654    
Investment, Identifier [Axis]: Capstone Logistics , Transportation      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   0  
Investment, Identifier [Axis]: Capstone Logistics, Transportation 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   20,758  
Investment, Identifier [Axis]: Carlyle GMS CLO, 16-3A FRR, Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,823 1,823  
Investment, Identifier [Axis]: Carr, Riggs & Ingram Capital, LLC , Business Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] 1,202    
Investment, Identifier [Axis]: Carr, Riggs & Ingram Capital, LLC , Business Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] (25)    
Investment, Identifier [Axis]: Carr, Riggs & Ingram Capital, LLC , Business Services 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8],[9] 11,572    
Investment, Identifier [Axis]: Carr, Riggs & Ingram Capital, LLC, Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11],[12]   11,593  
Investment, Identifier [Axis]: Carr, Riggs & Ingram Capital, LLC, Business Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   (58)  
Investment, Identifier [Axis]: Carr, Riggs & Ingram Capital, LLC, Business Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   313  
Investment, Identifier [Axis]: Center Phase Energy, LLC , Utilities      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8] 10,305    
Investment, Identifier [Axis]: Center Phase Energy, LLC, Utilities      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,386 [8],[18],[25] 10,305 [10],[11]  
Investment, Identifier [Axis]: Center Phase Energy, LLC, Utilities 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[20],[26]   2,386  
Investment, Identifier [Axis]: Charter Communications Operating, LLC, Cable      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   352  
Investment, Identifier [Axis]: Cirque Du Soleil Holding USA Newco, Inc. , Media/Entertainment      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 7,161 7,284  
Investment, Identifier [Axis]: Cirque Du Soleil Holding USA Newco, Inc. , Media/Entertainment 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [18],[21],[27] 6,045    
Investment, Identifier [Axis]: Cirque Du Soleil Holding USA Newco, Inc. , Media/Entertainment 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [18],[21],[27] 2,404    
Investment, Identifier [Axis]: Cirque Du Soleil Holding USA Newco, Inc., Media/Entertainment 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [20],[23],[28]   7,016  
Investment, Identifier [Axis]: Cirque Du Soleil Holding USA Newco, Inc., Media/Entertainment 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [20],[23],[28]   3,132  
Investment, Identifier [Axis]: Citadel Securities, LP , Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,449 4,465  
Investment, Identifier [Axis]: Clarios Global, LP , Transportation      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 10,006    
Investment, Identifier [Axis]: Cliffwater, LLC , Financials 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] (29)    
Investment, Identifier [Axis]: Cliffwater, LLC , Financials 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8],[9] 30,012    
Investment, Identifier [Axis]: Clover Holding 2, LLC , Software/Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,252 5,303  
Investment, Identifier [Axis]: Clover Technologies Group, LLC Industrials 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[18],[21] 0    
Investment, Identifier [Axis]: Clover Technologies Group, LLC , Industrials 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[18],[21] 0    
Investment, Identifier [Axis]: Clover Technologies Group, LLC, Industrials 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[20],[23]   628  
Investment, Identifier [Axis]: Clover Technologies Group, LLC, Industrials 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[20],[23]   0  
Investment, Identifier [Axis]: Cold Spring Brewing, Co. , Food & Beverage      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8],[9] 22,655    
Investment, Identifier [Axis]: Cold Spring Brewing, Co., Food & Beverage      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11],[12]   23,913  
Investment, Identifier [Axis]: CommerceHub, Inc. , Technology      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   4,684  
Investment, Identifier [Axis]: CommerceHub, Inc. , Technology      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,877    
Investment, Identifier [Axis]: CommerceHub, Inc., Technology      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 9,013 7,980 [11]  
Investment, Identifier [Axis]: Communication Technology Intermediate, LLC , Business Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] 1,188    
Investment, Identifier [Axis]: Communication Technology Intermediate, LLC , Business Services 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8] 24,480    
Investment, Identifier [Axis]: Communication Technology Intermediate, LLC , Business Services 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8],[9] 8,627    
Investment, Identifier [Axis]: Communication Technology Intermediate, LLC, Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   1,188  
Investment, Identifier [Axis]: Communication Technology Intermediate, LLC, Business Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   24,930  
Investment, Identifier [Axis]: Communication Technology Intermediate, LLC, Business Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 24,801 [7],[8] 24,603 [10],[11]  
Investment, Identifier [Axis]: Communication Technology Intermediate, LLC, Business Services 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11],[12]   8,672  
Investment, Identifier [Axis]: Communication Technology Intermediate, LLC, Business Services 5      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8] 2,432    
Investment, Identifier [Axis]: Compass Power Generation, LLC , Utilities      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,954 7,290  
Investment, Identifier [Axis]: Connect Finco SARL , Telecom      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   2,148  
Investment, Identifier [Axis]: Connect Finco SARL , Telecom      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,168    
Investment, Identifier [Axis]: Connectwise, LLC , Software/Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 12,746 12,826  
Investment, Identifier [Axis]: Conservice Midco, LLC , Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 7,435 7,516  
Investment, Identifier [Axis]: Consolidated Precision Products Corp., Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 23,636 [8],[17] 24,956 [11],[19]  
Investment, Identifier [Axis]: Corelogic, Inc. , Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   6,867  
Investment, Identifier [Axis]: Corelogic, Inc. , Business Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,848    
Investment, Identifier [Axis]: Corelogic, Inc., Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 8,984 [7] 8,994 [10]  
Investment, Identifier [Axis]: Corelogic, Inc., Business Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,908    
Investment, Identifier [Axis]: Corfin Industries, LLC , Industrials 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8] 1,550    
Investment, Identifier [Axis]: Corfin Industries, LLC , Industrials 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8] 9,436    
Investment, Identifier [Axis]: Corfin Industries, LLC , Industrials 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8],[9] 19,585    
Investment, Identifier [Axis]: Corfin Industries, LLC , Industrials 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8],[9] 15,851    
Investment, Identifier [Axis]: Corfin Industries, LLC, Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11],[12]   16,017  
Investment, Identifier [Axis]: Corfin Industries, LLC, Industrials 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11]   1,566  
Investment, Identifier [Axis]: Corfin Industries, LLC, Industrials 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11]   9,532  
Investment, Identifier [Axis]: Cornerstone Building Brands, Inc. , Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,947 1,322  
Investment, Identifier [Axis]: Cornerstone Building Brands, Inc., Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   3,239  
Investment, Identifier [Axis]: Cornerstone Chemical, Co. , Chemicals      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[18],[21] 3,107    
Investment, Identifier [Axis]: Cornerstone Chemical, Co., Chemicals      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[20],[23]   10,217  
Investment, Identifier [Axis]: Cornerstone Chemical, Co., Chemicals 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[20]   884  
Investment, Identifier [Axis]: Coronis Health I, LLC , Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[18],[21],[22] 4,900    
Investment, Identifier [Axis]: Coronis Health I, LLC 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13],[22] 532    
Investment, Identifier [Axis]: Coronis Health I, LLC 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[22] 3,990    
Investment, Identifier [Axis]: Coronis Health I, LLC, Equity/Other Investments      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,900 0  
Investment, Identifier [Axis]: Coronis Health I, LLC, Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[22] 2,682    
Investment, Identifier [Axis]: Coronis Health I, LLC, Senior Secured First Lien Debt 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 532 0  
Investment, Identifier [Axis]: Coronis Health I, LLC, Senior Secured First Lien Debt 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,990 0  
Investment, Identifier [Axis]: Coronis Health I, LLC, Senior Secured Second Lien Debt      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,682 0  
Investment, Identifier [Axis]: Coronis Health, LLC , Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[16]   801  
Investment, Identifier [Axis]: Coronis Health, LLC, Healthcare 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11],[16]   9,908  
Investment, Identifier [Axis]: Cotiviti, Inc. , Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   9,969  
Investment, Identifier [Axis]: Cotiviti, Inc. , Healthcare 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,722    
Investment, Identifier [Axis]: Cotiviti, Inc. , Healthcare 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 9,820    
Investment, Identifier [Axis]: Covenant Credit Partners CLO, Ltd. 17 1A E, Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   2,445  
Investment, Identifier [Axis]: Crisis Prevention Institute, Inc. , Education      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   2,336  
Investment, Identifier [Axis]: Crisis Prevention Institute, Inc., Education      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,319    
Investment, Identifier [Axis]: Crown Finance US, Inc. , Media/Entertainment      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,969 4,994  
Investment, Identifier [Axis]: Danish CRJ, Ltd., Equity/Other Investments      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 0 0
Investment, Identifier [Axis]: Danish CRJ, Ltd., Transportation      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [8],[18],[21],[27],[29],[30] 0 [11],[20],[23],[28],[31],[32]  
Investment, Identifier [Axis]: Demakes Borrower, LLC , Food & Beverage      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8] 17,667    
Investment, Identifier [Axis]: Demakes Borrower, LLC, Food & Beverage      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   0  
Investment, Identifier [Axis]: Demakes Borrower, LLC, Food & Beverage 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   17,756  
Investment, Identifier [Axis]: Directv Financing, LLC , Media/Entertainment      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 561 1,796  
Investment, Identifier [Axis]: Division Holding Corp. , Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   7,892  
Investment, Identifier [Axis]: Division Holding Corp., Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10]   3,413  
Investment, Identifier [Axis]: Dynagrid Holdings, LLC, Utilities      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   3,633  
Investment, Identifier [Axis]: Dynagrid Holdings, LLC, Utilities 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11],[12]   8,873  
Investment, Identifier [Axis]: Dynagrid Holdings, LLC, Utilities 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11],[12]   3,094  
Investment, Identifier [Axis]: Dynagrid Holdings, LLC, Utilities 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[12]   13,230  
Investment, Identifier [Axis]: Dyno Acquiror, Inc Consumer      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[20],[23]   21  
Investment, Identifier [Axis]: Dyno Acquiror, Inc. , Consumer      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[18],[21] 21    
Investment, Identifier [Axis]: EIG Management Co., LLC , Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,737 4,127  
Investment, Identifier [Axis]: Eaton Vance CDO, Ltd. 15-1A FR, Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,368 1,495  
Investment, Identifier [Axis]: Edelman Financial Center, LLC , Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,756    
Investment, Identifier [Axis]: Edelman Financial Center, LLC , Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   4,783  
Investment, Identifier [Axis]: Edelman Financial Center, LLC), Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10]   9,565  
Investment, Identifier [Axis]: Edelman Financial Center, LLC, Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7] 9,512    
Investment, Identifier [Axis]: Edgewater Generation, LLC , Utilities      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 7,271 7,403  
Investment, Identifier [Axis]: Einstein Parent, Inc., Software/Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] (43)    
Investment, Identifier [Axis]: Einstein Parent, Inc., Software/Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8],[9] 21,905    
Investment, Identifier [Axis]: Electric Power Engineers, LLC, Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 27,649 [7],[8],[9] 27,630 [10],[11],[12]  
Investment, Identifier [Axis]: Electric Power Engineers, LLC, Business Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (124) [8],[13] (133) [11],[14]  
Investment, Identifier [Axis]: Electric Power Engineers, LLC, Business Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (49) [8],[13] (53) [11],[14]  
Investment, Identifier [Axis]: Electro-Methods, LP, Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] (118)    
Investment, Identifier [Axis]: Electro-Methods, LP, Industrials 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8],[9] 34,094    
Investment, Identifier [Axis]: Electron Bidco, Inc. , Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   2,507  
Investment, Identifier [Axis]: Elevation CLO, Ltd. 13-1A D2, Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   1,668  
Investment, Identifier [Axis]: Eliassen Group, LLC, Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,351 [7],[8] 1,358 [10],[11]  
Investment, Identifier [Axis]: Eliassen Group, LLC, Business Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 16,889 [7],[8],[9] 16,976 [10],[11],[12]  
Investment, Identifier [Axis]: Emerald Borrower, LP , Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,300    
Investment, Identifier [Axis]: Emerald Borrower, LP, Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   5,332  
Investment, Identifier [Axis]: Ensemble RCM, LLC , Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 13,427 9,328  
Investment, Identifier [Axis]: Entain, PLC , Gaming/Lodging      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,478 3,492  
Investment, Identifier [Axis]: Epicor Software Corp. , Software/Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,113 4,033  
Investment, Identifier [Axis]: Examworks Bidco, Inc. , Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,097    
Investment, Identifier [Axis]: FBLC Senior Loan Fund, LLC , Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[18],[30],[33] 304,934    
Investment, Identifier [Axis]: FBLC Senior Loan Fund, LLC , Joint Venture      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 304,934 404,934  
Investment, Identifier [Axis]: FBLC Senior Loan Fund, LLC, Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[20],[28],[32],[34]   404,934  
Investment, Identifier [Axis]: FBLC Senior Loan Fund, LLC, Joint Venture      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   404,934 0
Investment, Identifier [Axis]: FGT Purchaser, LLC , Consumer      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8] 26,629    
Investment, Identifier [Axis]: FGT Purchaser, LLC, Consumer      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11]   2,697  
Investment, Identifier [Axis]: FGT Purchaser, LLC, Consumer 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   26,365  
Investment, Identifier [Axis]: FNZ Group Entities, Ltd. , Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,084    
Investment, Identifier [Axis]: FNZ Group Entities, Ltd., Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   4,869  
Investment, Identifier [Axis]: Faraday Buyer, LLC , Utilities      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   (92)  
Investment, Identifier [Axis]: Faraday Buyer, LLC, Consumer      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] (423)    
Investment, Identifier [Axis]: Faraday Buyer, LLC, Utilities      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] (92)    
Investment, Identifier [Axis]: Faraday Buyer, LLC, Utilities 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 40,336 [7],[8] 40,542 [10],[11]  
Investment, Identifier [Axis]: Faraday Buyer, LLC, Utilities 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 8,545 [7],[8] 8,589 [10],[11]  
Investment, Identifier [Axis]: Fiesta Purchaser, Inc. , Food & Beverage      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,480    
Investment, Identifier [Axis]: Fiesta Purchaser, Inc., Food & Beverage      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   2,487  
Investment, Identifier [Axis]: FinThrive Software Intermediate Holdings, Inc. , Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,985    
Investment, Identifier [Axis]: FinThrive Software Intermediate Holdings, Inc. , Healthcare 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   1,975  
Investment, Identifier [Axis]: FinThrive Software Intermediate Holdings, Inc. , Healthcare 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   2,960  
Investment, Identifier [Axis]: First Advantage Holdings, LLC , Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,456    
Investment, Identifier [Axis]: First Advantage Holdings, LLC, Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   4,544  
Investment, Identifier [Axis]: First Brands Group, LLC , Consumer      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,572 5,563  
Investment, Identifier [Axis]: First Eagle Greenway Fund II, LLC , Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [18],[21],[22],[27] 255    
Investment, Identifier [Axis]: First Eagle Greenway Fund II, LLC, Diversified Investment Vehicles 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [20],[23],[24],[28]   255  
Investment, Identifier [Axis]: First Eagle Greenway Fund II, LLC, Equity/Other Investments      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 255 255 0
Investment, Identifier [Axis]: Fitness International, LLC , Consumer      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 9,885 9,975  
Investment, Identifier [Axis]: FloWorks International, LLC, Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (45) [8],[13] (49) [11],[14]  
Investment, Identifier [Axis]: FloWorks International, LLC, Industrials 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 39,205 [7],[8],[9] 39,272 [10],[11],[12]  
Investment, Identifier [Axis]: Florida Food Products, LLC , Food & Beverage      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   10,603  
Investment, Identifier [Axis]: Florida Food Products, LLC, Food & Beverage      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8] 9,638    
Investment, Identifier [Axis]: Focus Financial Partners, LLC , Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,948    
Investment, Identifier [Axis]: Focus Financial Partners, LLC , Financials 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   7  
Investment, Identifier [Axis]: Focus Financial Partners, LLC , Financials 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   8,195  
Investment, Identifier [Axis]: Foley Products Co., LLC , Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,209    
Investment, Identifier [Axis]: Foley Products Co., LLC, Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   2,407  
Investment, Identifier [Axis]: Foresight Energy Operating, LLC , Energy      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 652 656  
Investment, Identifier [Axis]: Foresight Energy Operating, LLC, Energy      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,044 [8] 1,051 [11]  
Investment, Identifier [Axis]: Foresight Energy Operating, LLC, Energy 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 876 [8],[17],[18],[21] 779 [11],[19],[20],[23]  
Investment, Identifier [Axis]: Fortress Credit BSL, Ltd. 22-1A E, Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   993  
Investment, Identifier [Axis]: Foundation Building Materials, Inc. , Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 7,602 12,108  
Investment, Identifier [Axis]: Freeport LNG Investments, LLLP , Energy      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,419    
Investment, Identifier [Axis]: Freeport LNG Investments, LLLP , Energy      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   5,826  
Investment, Identifier [Axis]: GFL Environmental, Inc., Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   1,883  
Investment, Identifier [Axis]: GIP Pilot Acquisition Partners, LP, Energy      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   1,248  
Investment, Identifier [Axis]: GVC Holdings Gibraltar, Ltd. , Gaming/Lodging      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   4,836  
Investment, Identifier [Axis]: GVC Holdings Gibraltar, Ltd., Gaming/Lodging      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,801    
Investment, Identifier [Axis]: Galaxy US OpCo, Inc. , Software/Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,394 6,850  
Investment, Identifier [Axis]: Galway Borrower, LLC , Financials 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] 1,043    
Investment, Identifier [Axis]: Galway Borrower, LLC, Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 38,316 [7],[8] 38,532 [10],[11]  
Investment, Identifier [Axis]: Galway Borrower, LLC, Financials 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   278  
Investment, Identifier [Axis]: Galway Borrower, LLC, Financials 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 732 [8],[13] 81 [11],[14]  
Investment, Identifier [Axis]: Genesys Cloud Services Holdings I, LLC, Software/Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   4,827  
Investment, Identifier [Axis]: Geon Performance Solutions, LLC , Chemicals      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,297 4,568  
Investment, Identifier [Axis]: Geosyntec Consultants, Inc. , Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 9,238 9,308  
Investment, Identifier [Axis]: Global Medical Response, Inc. , Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 9,952 9,989  
Investment, Identifier [Axis]: Golden State Foods, LLC , Food & Beverage      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,475 6,551  
Investment, Identifier [Axis]: Gordian Medical, Inc, Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [8],[18],[21] 0 [11],[20],[23]  
Investment, Identifier [Axis]: Gordian Medical, Inc, Healthcare 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11],[20],[23]   2,875  
Investment, Identifier [Axis]: Gordian Medical, Inc. , Healthcare 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8],[18],[21] 2,944    
Investment, Identifier [Axis]: Gordian Medical, Inc., Healthcare 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 7,316 7,146  
Investment, Identifier [Axis]: Gordian Medical, Inc., Healthcare 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 0  
Investment, Identifier [Axis]: Green Energy Partners/Stonewall, LLC, Utilities      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 14,487 14,617 [10]  
Investment, Identifier [Axis]: Green Energy Partners/Stonewall, LLC, Utilities 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 7,385 7,451  
Investment, Identifier [Axis]: Greywolf CLO, Ltd. 20-3RA ER, Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 927 898  
Investment, Identifier [Axis]: Ground Penetrating Radar Systems, LLC, Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11],[12]   8,251  
Investment, Identifier [Axis]: Ground Penetrating Radar Systems, LLC, Business Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   0  
Investment, Identifier [Axis]: Ground Penetrating Radar Systems, LLC, Business Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   131  
Investment, Identifier [Axis]: Gulfside Supply, Inc. , Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   4,744  
Investment, Identifier [Axis]: Gulfside Supply, Inc., Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,665    
Investment, Identifier [Axis]: Hamilton Projects Acquiror, LLC , Utilities      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   7,030  
Investment, Identifier [Axis]: Hamilton Projects Acquiror, LLC, Utilities      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,839    
Investment, Identifier [Axis]: Hayfin Kingsland XI, Ltd. 19-2A ER, Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   2,474  
Investment, Identifier [Axis]: HealthEdge Software, Inc, Healthcare 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11],[12]   21,429  
Investment, Identifier [Axis]: HealthEdge Software, Inc. , Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11]   9,453  
Investment, Identifier [Axis]: HealthEdge Software, Inc., Healthcare 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   (27)  
Investment, Identifier [Axis]: Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[18],[21] 0    
Investment, Identifier [Axis]: HelpSystems Holdings, Inc. , Software/Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,890 6,404  
Investment, Identifier [Axis]: Higginbotham Insurance Agency, Inc., Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 10,046 [8],[18] 10,046 [11],[20],[23]  
Investment, Identifier [Axis]: Highbridge Loan Management, Ltd. 11A-17 E, Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,573 2,513  
Investment, Identifier [Axis]: Hometown Food, Co., Food & Beverage      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8],[9] 15,723    
Investment, Identifier [Axis]: Hospice Care Buyer, Inc., Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8] 2,143    
Investment, Identifier [Axis]: Hospice Care Buyer, Inc., Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11]   2,154  
Investment, Identifier [Axis]: Hospice Care Buyer, Inc., Healthcare 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,638 [8] 4,661 [11]  
Investment, Identifier [Axis]: Hospice Care Buyer, Inc., Healthcare 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,609 [8],[13] 1,649 [11],[14]  
Investment, Identifier [Axis]: Hospice Care Buyer, Inc., Healthcare 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,546 [7],[8] 3,563 [10],[11]  
Investment, Identifier [Axis]: Hospice Care Buyer, Inc., Healthcare 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 24,952 [7],[8] 25,076 [10],[11]  
Investment, Identifier [Axis]: Hospice Care Buyer, Inc., Healthcare 5      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 8,443 [7],[8] 8,484 [10],[11]  
Investment, Identifier [Axis]: Hospice Care Buyer, Inc., Healthcare 6      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,476 [7],[8] 6,509 [10],[11]  
Investment, Identifier [Axis]: Hudson River Trading, LLC , Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   5,296  
Investment, Identifier [Axis]: Hudson River Trading, LLC , Financials 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,494    
Investment, Identifier [Axis]: Hudson River Trading, LLC , Financials 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,267    
Investment, Identifier [Axis]: Hunter Douglas, Inc. , Consumer      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,486 4,957  
Investment, Identifier [Axis]: ICP Industrial, Inc. , Chemicals      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   4,471  
Investment, Identifier [Axis]: ICR Operations, LLC, Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8] 40,839    
Investment, Identifier [Axis]: ICR Operations, LLC, Business Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,219 [8] 41,292 [11]  
Investment, Identifier [Axis]: ICR Operations, LLC, Business Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,780 [8],[13] 2,243 [11]  
Investment, Identifier [Axis]: ICR Operations, LLC, Business Services 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   6,101  
Investment, Identifier [Axis]: ICR Operations, LLC, Business Services 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   1,597  
Investment, Identifier [Axis]: IDERA, Inc. , Technology      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   6,656  
Investment, Identifier [Axis]: IDERA, Inc. , Technology 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,651    
Investment, Identifier [Axis]: IDERA, Inc. , Technology 1.1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 933    
Investment, Identifier [Axis]: IDERA, Inc., Technology      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   997  
Investment, Identifier [Axis]: IG Investments Holdings, LLC, Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   0  
Investment, Identifier [Axis]: IG Investments Holdings, LLC, Business Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   26,263  
Investment, Identifier [Axis]: IQN Holding Corp., Software/Service 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] 1,115    
Investment, Identifier [Axis]: IQN Holding Corp., Software/Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   595  
Investment, Identifier [Axis]: IQN Holding Corp., Software/Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,699 [8] 17,184 [10],[11],[12]  
Investment, Identifier [Axis]: IQN Holding Corp., Software/Services 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8],[9] 17,096    
Investment, Identifier [Axis]: IXS Holdings, Inc. , Transportation      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 7,189 7,166  
Investment, Identifier [Axis]: Icon Parent, Inc. , Software/Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   5,014  
Investment, Identifier [Axis]: Icon Parent, Inc. , Software/Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,038    
Investment, Identifier [Axis]: Icon Parent, Inc. , Software/Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,992    
Investment, Identifier [Axis]: Icon Parent, Inc., Software/Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   5,069  
Investment, Identifier [Axis]: Ideal Tridon Holdings, Inc., Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (78) [8],[13] 7 [11],[14]  
Investment, Identifier [Axis]: Ideal Tridon Holdings, Inc., Industrials 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (65) [8],[13] 29,938 [10],[11],[12]  
Investment, Identifier [Axis]: Ideal Tridon Holdings, Inc., Industrials 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8],[9] 41,951    
Investment, Identifier [Axis]: Ideal Tridon Holdings, Inc., Industrials 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] 0    
Investment, Identifier [Axis]: Ideal Tridon Holdings, Inc., Industrials 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8] 26,132    
Investment, Identifier [Axis]: Indigo Buyer, Inc. , Paper & Packaging 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] 0    
Investment, Identifier [Axis]: Indigo Buyer, Inc. , Paper & Packaging 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   11,258  
Investment, Identifier [Axis]: Indigo Buyer, Inc., Paper & Packaging      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 912 [8],[13] 7,861 [11]  
Investment, Identifier [Axis]: Indigo Buyer, Inc., Paper & Packaging 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   (114)  
Investment, Identifier [Axis]: Indigo Buyer, Inc., Paper & Packaging 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 61,186 [7],[8] 0 [11],[14]  
Investment, Identifier [Axis]: Indigo Buyer, Inc., Paper & Packaging 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   12,661  
Investment, Identifier [Axis]: Indigo Buyer, Inc., Paper & Packaging 5      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   29,600  
Investment, Identifier [Axis]: InhabitIQ, Inc, Software/Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] (34)    
Investment, Identifier [Axis]: InhabitIQ, Inc. , Software/Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] (21)    
Investment, Identifier [Axis]: InhabitIQ, Inc.,Software/Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8],[9] 26,017    
Investment, Identifier [Axis]: Integrated Efficiency Solutions, Inc, Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13],[22] (59)    
Investment, Identifier [Axis]: Integrated Efficiency Solutions, Inc, Industrials 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[22] 240    
Investment, Identifier [Axis]: Integrated Efficiency Solutions, Inc, Industrials 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[22] 1,250    
Investment, Identifier [Axis]: Integrated Efficiency Solutions, Inc, Industrials 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] (78)    
Investment, Identifier [Axis]: Integrated Efficiency Solutions, Inc, Industrials 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] 186    
Investment, Identifier [Axis]: Integrated Efficiency Solutions, Inc, Industrials 5      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8],[9] 32,277    
Investment, Identifier [Axis]: Integrated Efficiency Solutions, Inc, Industrials 6      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[17],[18],[21],[22] 0    
Investment, Identifier [Axis]: Integrated Efficiency Solutions, Inc. , Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[16],[24]   446  
Investment, Identifier [Axis]: Integrated Efficiency Solutions, Inc., Equity/Other Investments 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 0 0
Investment, Identifier [Axis]: Integrated Efficiency Solutions, Inc., Equity/Other Investments 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 0 0
Investment, Identifier [Axis]: Integrated Efficiency Solutions, Inc., Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [8],[15],[22] 210 [11],[14],[24]  
Investment, Identifier [Axis]: Integrated Efficiency Solutions, Inc., Industrials 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[24]   1,393  
Investment, Identifier [Axis]: Integrated Efficiency Solutions, Inc., Industrials 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[19],[20],[23],[24]   0  
Investment, Identifier [Axis]: Integrated Efficiency Solutions, Inc., Industrials 6      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[19],[20],[23],[24]   0  
Investment, Identifier [Axis]: Integrated Efficiency Solutions, Inc., Industrials 7      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[17],[18],[21],[22] 0    
Investment, Identifier [Axis]: Integrated Efficiency Solutions, Inc., Senior Secured First Lien Debt      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 240 0  
Investment, Identifier [Axis]: Integrated Efficiency Solutions, Inc., Senior Secured First Lien Debt 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,250 1,393  
Investment, Identifier [Axis]: Integrated Efficiency Solutions, Inc., Senior Secured First Lien Debt 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (59) 210 0
Investment, Identifier [Axis]: Integrated Efficiency Solutions, Inc., Senior Secured First Lien Debt 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   1,393 0
Investment, Identifier [Axis]: Integrated Efficiency Solutions, Inc., Senior Secured Second Lien Debt      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 446 0
Investment, Identifier [Axis]: Integrated Global Services, Inc., Industrials 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11]   1,825  
Investment, Identifier [Axis]: Integrated Global Services, Inc., Industrials 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   0  
Investment, Identifier [Axis]: Integrated Global Services, Inc., Industrials 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[12]   13,510  
Investment, Identifier [Axis]: Internap Corp., Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [7],[8],[18],[21] 0 [10],[11],[20],[23]  
Investment, Identifier [Axis]: International Cruise & Excursion Gallery, Inc, Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,358 [8],[9] 0 [11],[12],[20],[23]  
Investment, Identifier [Axis]: International Cruise & Excursion Gallery, Inc., Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [8],[9],[18],[21] 1,439 [11],[12]  
Investment, Identifier [Axis]: J&K Ingredients, LLC, Food & Beverage      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 12,282 [7],[8] 12,344 [10],[11]  
Investment, Identifier [Axis]: JSG II, Inc. , Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 396    
Investment, Identifier [Axis]: Jack Ohio Finance, LLC , Gaming/Lodging      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   3,881  
Investment, Identifier [Axis]: Jamestown CLO, Ltd. 22-18A E, Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   2,975  
Investment, Identifier [Axis]: Jane Street Group, LLC , Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,124    
Investment, Identifier [Axis]: Jane Street Group, LLC , Financials 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   6,544  
Investment, Identifier [Axis]: Jane Street Group, LLC , Financials 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   6,137  
Investment, Identifier [Axis]: Jazz Securities, DAC, Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   943  
Investment, Identifier [Axis]: Johnstone Supply, LLC , Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   984  
Investment, Identifier [Axis]: Jump Financial, LLC , Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 7,268 7,232  
Investment, Identifier [Axis]: KKR Financial CLO, Ltd. 15 FR, Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,795 1,768  
Investment, Identifier [Axis]: Kahala Aviation, LLC , Equity/Other Investments      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 9,427 2,308  
Investment, Identifier [Axis]: Kahala Aviation, LLC , Transportation      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[18],[21],[30],[35],[36] 9,427    
Investment, Identifier [Axis]: Kahala Aviation, LLC, Subordinated Debt      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 27,045 0  
Investment, Identifier [Axis]: Kahala Aviation, LLC, Transportation      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 27,045 [8],[30] 2,308 [11],[20],[23],[32],[37],[38]  
Investment, Identifier [Axis]: Kahala Ireland OpCo Designated Activity Company, Equity/Other Investments 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   0 0
Investment, Identifier [Axis]: Kahala Ireland OpCo Designated Activity Company, Equity/Other Investments 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   0 0
Investment, Identifier [Axis]: Kahala US OpCo, LLC, Equity/Other Investments 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   2,308 0
Investment, Identifier [Axis]: Kahala US OpCo, LLC, Equity/Other Investments 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   0 0
Investment, Identifier [Axis]: Kahala US OpCo, LLC, Transportation      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [8],[18],[21],[27],[30],[35] 0 [11],[20],[23],[28],[32],[37]  
Investment, Identifier [Axis]: Kaman Corp. , Industrials 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,220    
Investment, Identifier [Axis]: Kaman Corp. , Industrials 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (1)    
Investment, Identifier [Axis]: Kaseya, Inc. , Software/Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 696    
Investment, Identifier [Axis]: Kaseya, Inc. , Software/Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,804    
Investment, Identifier [Axis]: Kissner Milling Co., Ltd., Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[20]   4,950  
Investment, Identifier [Axis]: Knowledge Pro Buyer, Inc, Business Services 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8] 0    
Investment, Identifier [Axis]: Knowledge Pro Buyer, Inc, Business Services 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8] 23,277    
Investment, Identifier [Axis]: Knowledge Pro Buyer, Inc, Business Services 5      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8],[9] 34,772    
Investment, Identifier [Axis]: Knowledge Pro Buyer, Inc., Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [8],[13] 294 [11],[14]  
Investment, Identifier [Axis]: Knowledge Pro Buyer, Inc., Business Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [8],[13] 16,445 [10],[11],[14]  
Investment, Identifier [Axis]: Knowledge Pro Buyer, Inc., Business Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 451 [7],[8] 34,952 [10],[11],[12]  
Investment, Identifier [Axis]: Kuehg Corp. , Education      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,079 3,122  
Investment, Identifier [Axis]: LABL, Inc. , Paper & Packaging      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   4,787  
Investment, Identifier [Axis]: LABL, Inc., Paper & Packaging      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,435    
Investment, Identifier [Axis]: LBM Acquisition, LLC , Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   4,982  
Investment, Identifier [Axis]: LCM, Ltd. Partnership 16A ER2, Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,117 2,275  
Investment, Identifier [Axis]: LSF12 Donnelly Bidco, LLC, Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 18,835 [7],[8] 18,930 [10],[11]  
Investment, Identifier [Axis]: Labrie Environmental Group, LLC, Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 21,780 [8],[27] 21,894 [11],[28]  
Investment, Identifier [Axis]: Lakeland Tours, LLC , Education      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11],[12],[16]   1,414  
Investment, Identifier [Axis]: Lakeland Tours, LLC, Education      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[9],[15] 1,414    
Investment, Identifier [Axis]: Lakeland Tours, LLC, Education 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8],[9],[15] 17    
Investment, Identifier [Axis]: Lakeshore Learning Materials, LLC , Retail      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   4,862  
Investment, Identifier [Axis]: Lakeview Health Holdings, Inc, Senior Secured First Lien Debt 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   0 0
Investment, Identifier [Axis]: Lakeview Health Holdings, Inc, Senior Secured First Lien Debt 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   0 0
Investment, Identifier [Axis]: Lakeview Health Holdings, Inc, Senior Secured First Lien Debt 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   0 0
Investment, Identifier [Axis]: Lakeview Health Holdings, Inc. , Senior Secured First Lien Debt      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 0  
Investment, Identifier [Axis]: Lakeview Health Holdings, Inc., Equity/Other Investments      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   0 0
Investment, Identifier [Axis]: Lakeview Health Holdings, Inc., Senior Secured First Lien Debt 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   0 0
Investment, Identifier [Axis]: Lakeview Health Holdings, Inc., Senior Secured First Lien Debt 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   0 0
Investment, Identifier [Axis]: Lakeview Health Holdings, Inc., Senior Secured First Lien Debt 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   0 0
Investment, Identifier [Axis]: LaserShip, Inc. , Transportation      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,224 2,850  
Investment, Identifier [Axis]: LaserShip, Inc. , Transportation 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10]   1,096  
Investment, Identifier [Axis]: LaserShip, Inc., Transportation      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 849    
Investment, Identifier [Axis]: LaserShip, Inc., Transportation 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 804    
Investment, Identifier [Axis]: LaserShip, Inc., Transportation 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10]   978  
Investment, Identifier [Axis]: Last Dance Intermediate II, LLC, Telecom      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8],[9] 18,867    
Investment, Identifier [Axis]: Last Dance Intermediate II, LLC, Telecom 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] (187)    
Investment, Identifier [Axis]: Last Dance Intermediate II, LLC, Telecom 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] (48)    
Investment, Identifier [Axis]: Last Dance Intermediate II, LLC, Telecom 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8],[9] 19,034    
Investment, Identifier [Axis]: LifePoint Health, Inc. , Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,767 3,830  
Investment, Identifier [Axis]: LifePoint Health, Inc., Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   4,861  
Investment, Identifier [Axis]: Lighthouse Intelligence, Ltd, Software/Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13],[27] (172)    
Investment, Identifier [Axis]: Lighthouse Intelligence, Ltd, Software/Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [13],[27] (123)    
Investment, Identifier [Axis]: Lighthouse Intelligence, Ltd, Software/Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[27] 22,107    
Investment, Identifier [Axis]: Lightning Power, LLC , Utilities      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   4,534  
Investment, Identifier [Axis]: Lightstone Holdco, LLC , Utilities 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 15,752 16,025  
Investment, Identifier [Axis]: Lightstone Holdco, LLC , Utilities 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 891 906  
Investment, Identifier [Axis]: Liquid Tech Solutions Holdings, LLC , Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 9,884 9,933  
Investment, Identifier [Axis]: Luxembourg Investment Co., 428 SARL, Chemicals      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   51  
Investment, Identifier [Axis]: MCS Acquisition Corp. , Business Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[18],[21] 747    
Investment, Identifier [Axis]: MCS Acquisition Corp. Business Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[18],[21] 325    
Investment, Identifier [Axis]: MCS Acquisition Corp., Business Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[20],[23]   747  
Investment, Identifier [Axis]: MCS Acquisition Corp., Business Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[20],[23]   325  
Investment, Identifier [Axis]: MGTF Holdco, LLC , Media/Entertainment      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[17],[18],[21],[30] 0    
Investment, Identifier [Axis]: MGTF Holdco, LLC, Equity/Other Investments      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   0 0
Investment, Identifier [Axis]: MGTF Holdco, LLC, Media/Entertainment      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[19],[20],[23],[32]   0  
Investment, Identifier [Axis]: MGTF Radio Company, LLC, Media/Entertainment      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 19,809 [8],[15],[30] 31,672 [11],[32]  
Investment, Identifier [Axis]: MGTF Radio Company, LLC, Senior Secured First Lien Debt      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 19,809 31,672 0
Investment, Identifier [Axis]: MH Sub I, LLC , Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,998 4,432  
Investment, Identifier [Axis]: MPH Acquisition Holdings, LLC , Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   735  
Investment, Identifier [Axis]: MPH Acquisition Holdings, LLC , Healthcare 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 92    
Investment, Identifier [Axis]: MPH Acquisition Holdings, LLC , Healthcare 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 691    
Investment, Identifier [Axis]: MRI Software, LLC, Software/Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   2,198  
Investment, Identifier [Axis]: MRI Software, LLC, Software/Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,178 [8] 588 [11],[14]  
Investment, Identifier [Axis]: MRI Software, LLC, Software/Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] 5,445    
Investment, Identifier [Axis]: MYOB US Borrower, LLC , Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   5,201  
Investment, Identifier [Axis]: Madison IAQ, LLC , Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   1,893  
Investment, Identifier [Axis]: Magnite, Inc., Technology      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   5,031  
Investment, Identifier [Axis]: Mandrake Bidco, Inc, Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] 0    
Investment, Identifier [Axis]: Mandrake Bidco, Inc, Industrials 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8],[9] 59,345    
Investment, Identifier [Axis]: Mandrake Bidco, Inc. , Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   (96)  
Investment, Identifier [Axis]: Mandrake Bidco, Inc. , Industrials 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11],[12]   62,532  
Investment, Identifier [Axis]: Manna Pro Products, LLC ), Consumer 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[12]   1,570  
Investment, Identifier [Axis]: Manna Pro Products, LLC), Consumer 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   2,208  
Investment, Identifier [Axis]: Manna Pro Products, LLC), Consumer 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[12]   5,645  
Investment, Identifier [Axis]: Manna Pro Products, LLC, Consumer      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8] 3,313    
Investment, Identifier [Axis]: Manna Pro Products, LLC, Consumer 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (430) [8],[13] 3,293 [11]  
Investment, Identifier [Axis]: Manna Pro Products, LLC, Consumer 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[9] 1,579    
Investment, Identifier [Axis]: Manna Pro Products, LLC, Consumer 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[9] 5,680    
Investment, Identifier [Axis]: Manna Pro Products, LLC, Consumer 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[9] 20,033    
Investment, Identifier [Axis]: Manna Pro Products, LLC, Consumer 5      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[12]   19,909  
Investment, Identifier [Axis]: Max US Bidco, Inc. , Food & Beverage      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   4,822  
Investment, Identifier [Axis]: Max US Bidco, Inc., Food & Beverage      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,889    
Investment, Identifier [Axis]: McDonald Worley, P.C, Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[15] 12,848    
Investment, Identifier [Axis]: McDonald Worley, P.C., Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,390 [8],[18],[21] 12,442 [11],[16]  
Investment, Identifier [Axis]: McDonald Worley, P.C., Business Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[20],[23]   3,140  
Investment, Identifier [Axis]: Medalist Partners Corporate Finance CLO, Ltd. 21-1A D, Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   2,964  
Investment, Identifier [Axis]: Medical Depot Holdings, Inc., Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11]   4,155  
Investment, Identifier [Axis]: Medical Depot Holdings, Inc., Healthcare 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,257 [8] 21,727 [10],[11],[12]  
Investment, Identifier [Axis]: Medical Depot Holdings, Inc., Healthcare 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8],[9] 19,626    
Investment, Identifier [Axis]: Medical Management Resource Group, LLC, Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] 1,361    
Investment, Identifier [Axis]: Medical Management Resource Group, LLC, Healthcare 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 9,231 [7],[8] 9,279 [10],[11]  
Investment, Identifier [Axis]: Medical Management Resource Group, LLC, Healthcare 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 22,349 [7],[8] 1,207 [11],[14]  
Investment, Identifier [Axis]: Medical Management Resource Group, LLC, Healthcare 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   22,466  
Investment, Identifier [Axis]: Medline Borrower, LP , Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   4,001  
Investment, Identifier [Axis]: Megavolt Borrower, LLC, Utilities      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8],[9] 36,472    
Investment, Identifier [Axis]: Mermaid Bidco, Inc. , Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 7,481    
Investment, Identifier [Axis]: Michael Baker International, LLC , Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,239    
Investment, Identifier [Axis]: Michael Baker International, LLC, Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   3,253  
Investment, Identifier [Axis]: Midwest Can Company, LLC, Paper & Packaging      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 27,902 [7],[8],[9] 29,913 [10],[11],[12]  
Investment, Identifier [Axis]: Miller Environmental Group, Inc, Business Services 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   (35)  
Investment, Identifier [Axis]: Miller Environmental Group, Inc., Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 17,387 [7],[8],[9] 17,464 [10],[11],[12]  
Investment, Identifier [Axis]: Miller Environmental Group, Inc., Business Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (65) [8],[13] (70) [11],[14]  
Investment, Identifier [Axis]: Miller Environmental Group, Inc., Business Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (32) [8],[13] (35) [11],[14]  
Investment, Identifier [Axis]: Mirra-Primeaccess Holdings, LLC, Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   6,754  
Investment, Identifier [Axis]: Mirra-Primeaccess Holdings, LLC, Healthcare 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 7,316 [8],[13] 58,479 [10],[11]  
Investment, Identifier [Axis]: Mirra-Primeaccess Holdings, LLC, Healthcare 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8] 61,599    
Investment, Identifier [Axis]: Monogram Food Solutions, LLC , Food & Beverage      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,099    
Investment, Identifier [Axis]: Motor Vehicle Software Corp., Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 764 [8],[18],[21],[39] 523 [11],[20],[23],[40]  
Investment, Identifier [Axis]: Muth Mirror Systems, LLC , Technology 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[17],[18],[21] 0    
Investment, Identifier [Axis]: Muth Mirror Systems, LLC, Technology      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11]   1,083  
Investment, Identifier [Axis]: Muth Mirror Systems, LLC, Technology 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 829 [8],[15] 11,836 [10],[11],[12]  
Investment, Identifier [Axis]: Muth Mirror Systems, LLC, Technology 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 8,958 [8],[15] 0 [11],[19],[20],[23]  
Investment, Identifier [Axis]: Muth Mirror Systems, LLC, Technology 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [8],[17],[18],[21] 0 [11],[19],[20],[23]  
Investment, Identifier [Axis]: National Mentor Holdings, Inc. , Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   93  
Investment, Identifier [Axis]: National Mentor Holdings, Inc. , Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   2,349  
Investment, Identifier [Axis]: Neptune Bidco US, Inc., Publishing      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,711 1,888  
Investment, Identifier [Axis]: New Star Metals, Inc., Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11],[12]   28,751  
Investment, Identifier [Axis]: NewStar Arlington Senior Loan Program, LLC 14-1A FR, Collateralized Securities      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,237 4,237 0
Investment, Identifier [Axis]: NewStar Arlington Senior Loan Program, LLC 14-1A FR, Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,237 [8],[18],[22],[27] 4,237 [11],[20],[24],[28]  
Investment, Identifier [Axis]: NewStar Arlington Senior Loan Program, LLC 14-1A SUB, Collateralized Securities      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,409 2,170 0
Investment, Identifier [Axis]: NewStar Arlington Senior Loan Program, LLC 14-1A SUB, Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,409 [8],[18],[22],[27],[41] 2,170 [11],[20],[24],[28],[42]  
Investment, Identifier [Axis]: Newstar Fairfield Fund CLO, Ltd. 2015-1RA F, Collateralized Securities      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 2,457 0
Investment, Identifier [Axis]: Newstar Fairfield Fund CLO, Ltd. 2015-1RA F, Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[20],[24],[28]   2,457  
Investment, Identifier [Axis]: Newstar Fairfield Fund CLO, Ltd. 2015-1RA SUB, Collateralized Securities      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 512 1,208 0
Investment, Identifier [Axis]: Newstar Fairfield Fund CLO, Ltd. 2015-1RA SUB, Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 512 [8],[18],[22],[27],[41] 1,208 [11],[20],[24],[28],[42]  
Investment, Identifier [Axis]: Nexus Buyer, LLC , Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,001 7,173  
Investment, Identifier [Axis]: Northwoods Capital, Ltd. 17-15A ER, Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   2,959  
Investment, Identifier [Axis]: Norvax, LLC, Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 576 [8] 195 [11],[14],[28]  
Investment, Identifier [Axis]: Nouryon Finance B.V. , Chemicals      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,223 2,261  
Investment, Identifier [Axis]: OCP CLO, Ltd. 14-5A DR, Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,124 2,085  
Investment, Identifier [Axis]: ORG GC Holdings, LLC (2), Equity/Other Investments 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 0  
Investment, Identifier [Axis]: ORG GC Holdings, LLC , Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[17],[18],[21],[22] 0    
Investment, Identifier [Axis]: ORG GC Holdings, LLC, Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 10,111 [8],[22] 4,999 [11],[24]  
Investment, Identifier [Axis]: ORG GC Holdings, LLC, Business Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,932 [8],[22] 10,112 [11],[24]  
Investment, Identifier [Axis]: ORG GC Holdings, LLC, Business Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [8],[17],[22] 0 [11],[19],[20],[23],[24]  
Investment, Identifier [Axis]: ORG GC Holdings, LLC, Business Services 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[19],[20],[23],[24]   0  
Investment, Identifier [Axis]: ORG GC Holdings, LLC, Equity/Other Investments 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 0 0
Investment, Identifier [Axis]: ORG GC Holdings, LLC, Equity/Other Investments 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 0 0
Investment, Identifier [Axis]: ORG GC Holdings, LLC, Senior Secured First Lien Debt      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 10,111 10,112  
Investment, Identifier [Axis]: ORG GC Holdings, LLC, Senior Secured First Lien Debt 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   10,112 0
Investment, Identifier [Axis]: ORG GC Holdings, LLC, Senior Secured First Lien Debt 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   0 0
Investment, Identifier [Axis]: ORG GC Holdings, LLC, Senior Secured Second Lien Debt      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,932 4,999 0
Investment, Identifier [Axis]: OZLM, Ltd. 16-15A DR, Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,904 1,875  
Investment, Identifier [Axis]: Odessa Technologies, Inc., Software/Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   0  
Investment, Identifier [Axis]: Odessa Technologies, Inc., Software/Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 467 [8],[13] 20,446 [10],[11]  
Investment, Identifier [Axis]: Odessa Technologies, Inc., Software/Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8] 20,341    
Investment, Identifier [Axis]: Omnia Partners, LLC , Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   6,240  
Investment, Identifier [Axis]: Omnia Partners, LLC , Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,192    
Investment, Identifier [Axis]: OneDigital Borrower, LLC , Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   6,849  
Investment, Identifier [Axis]: Osaic Holdings, Inc. , Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,472 5,506  
Investment, Identifier [Axis]: Oscar AcquisitionCo, LLC , Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,146 4,884  
Investment, Identifier [Axis]: PG&E Corp., Utilities      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 8,631 6,946  
Investment, Identifier [Axis]: PODS, LLC , Paper & Packaging      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 9,094 6,944  
Investment, Identifier [Axis]: PRA Health Sciences, Inc., Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,442 8,284  
Investment, Identifier [Axis]: Palmer Square CLO, Ltd. 21-4A F, Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,408 1,383  
Investment, Identifier [Axis]: Peer Holding III B.V. , Retail      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,997 6,024  
Investment, Identifier [Axis]: PennantPark Credit Opportunities Fund II, LP , Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [18],[21],[22],[27] 568    
Investment, Identifier [Axis]: PennantPark Credit Opportunities Fund II, LP, Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [20],[23],[24],[28]   603  
Investment, Identifier [Axis]: PennantPark Credit Opportunities Fund II, LP, Equity/Other Investments      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 568 603 0
Investment, Identifier [Axis]: Peraton Corp. , Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,297    
Investment, Identifier [Axis]: Peraton Corp. , Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   4,557  
Investment, Identifier [Axis]: Peraton Corp., Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 8,166    
Investment, Identifier [Axis]: Peraton Corp., Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   4,030  
Investment, Identifier [Axis]: PetSmart, LLC , Retail      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   2,462  
Investment, Identifier [Axis]: PetSmart, LLC , Retail      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,431    
Investment, Identifier [Axis]: PetVet Care Centers, LLC, Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 29,960 [7],[8],[9] 30,091 [10],[11],[12]  
Investment, Identifier [Axis]: PetVet Care Centers, LLC, Healthcare 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (65) [8],[13] (68) [11],[14]  
Investment, Identifier [Axis]: PetVet Care Centers, LLC, Healthcare 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (65) [8],[13] (68) [11],[14]  
Investment, Identifier [Axis]: Pie Buyer, Inc. Food & Beverage 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   8,395  
Investment, Identifier [Axis]: Pie Buyer, Inc., Food & Beverage      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   2,013  
Investment, Identifier [Axis]: Pie Buyer, Inc., Food & Beverage 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,413 [8] 2,202 [10],[11]  
Investment, Identifier [Axis]: Pie Buyer, Inc., Food & Beverage 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8] 2,127    
Investment, Identifier [Axis]: Pie Buyer, Inc., Food & Beverage 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 8,110 [7],[8] 2,838 [10],[11],[12]  
Investment, Identifier [Axis]: Pie Buyer, Inc., Food & Beverage 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,759 [7],[8],[9] 38,788 [10],[11],[12]  
Investment, Identifier [Axis]: Pie Buyer, Inc., Food & Beverage 5      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8],[9] 37,474    
Investment, Identifier [Axis]: PlayPower, Inc, Industrials 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8],[9] 2,909    
Investment, Identifier [Axis]: PlayPower, Inc. Industrials 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11],[12]   17,016  
Investment, Identifier [Axis]: PlayPower, Inc., Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [8],[13] (37) [11],[14]  
Investment, Identifier [Axis]: PlayPower, Inc., Industrials 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8],[9] 17,175    
Investment, Identifier [Axis]: Pluralsight, LLC, Software/Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,985 [8],[18],[21] 5,985 [11],[20],[23]  
Investment, Identifier [Axis]: Pluralsight, LLC, Software/Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,587 [8] 4,551 [11]  
Investment, Identifier [Axis]: Pluralsight, LLC, Software/Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 7,460 [8] 7,020 [11]  
Investment, Identifier [Axis]: Pluralsight, LLC, Software/Services 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,330 [8] 2,312 [11]  
Investment, Identifier [Axis]: Pluto Acquisition I, Inc, Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8] 31,506    
Investment, Identifier [Axis]: Pluto Acquisition I, Inc. , Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 8,422    
Investment, Identifier [Axis]: Pluto Acquisition I, Inc. , Healthcare 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   29,373  
Investment, Identifier [Axis]: Pluto Acquisition I, Inc. , Healthcare 1.1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   8,838  
Investment, Identifier [Axis]: Pluto Acquisition I, Inc., Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,337 3,366  
Investment, Identifier [Axis]: Point Broadband Acquisition, LLC, Telecom      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[19],[20],[23],[26]   4,758  
Investment, Identifier [Axis]: Point Broadband Acquisition, LLC, Telecom 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 11,592 [7],[8] 11,592 [10],[11]  
Investment, Identifier [Axis]: Point Broadband Acquisition, LLC, Telecom 1.1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[17],[18],[21],[25] 4,935    
Investment, Identifier [Axis]: Point Broadband Acquisition, LLC, Telecom 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 27,502 [7],[8] 27,502 [10],[11]  
Investment, Identifier [Axis]: Point Broadband Acquisition, LLC, Telecom 2.1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[17],[18],[21],[25] 124    
Investment, Identifier [Axis]: Point Broadband Acquisition, LLC, Telecom 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[19],[20],[23],[26]   374  
Investment, Identifier [Axis]: Post Road Equipment Finance, LLC , Equity/Other Investments      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 119,233 119,233  
Investment, Identifier [Axis]: Post Road Equipment Finance, LLC , Subordinated Debt 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 35,000 35,000  
Investment, Identifier [Axis]: Post Road Equipment Finance, LLC , Subordinated Debt 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,000 3,000  
Investment, Identifier [Axis]: Post Road Equipment Finance, LLC , Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[17],[18],[25],[30],[33] 119,233    
Investment, Identifier [Axis]: Post Road Equipment Finance, LLC , Subordinated Debt 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 62,600 62,599  
Investment, Identifier [Axis]: Post Road Equipment Finance, LLC), Financials 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[32],[34],[43],[44]   62,599  
Investment, Identifier [Axis]: Post Road Equipment Finance, LLC, Equity/Other Investments      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   119,233 32,600
Investment, Identifier [Axis]: Post Road Equipment Finance, LLC, Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13],[30],[33] 5,000    
Investment, Identifier [Axis]: Post Road Equipment Finance, LLC, Financials 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[30],[33] 35,000    
Investment, Identifier [Axis]: Post Road Equipment Finance, LLC, Financials 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 62,600 [8],[30],[33] 119,233 [11],[19],[20],[26],[32],[34]  
Investment, Identifier [Axis]: Post Road Equipment Finance, LLC, Financials 3.1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14],[32],[34]   3,000  
Investment, Identifier [Axis]: Post Road Equipment Finance, LLC, Financials 5      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[32],[34],[43],[44]   35,000  
Investment, Identifier [Axis]: Post Road Equipment Finance, LLC, Subordinated Debt 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   35,000 11,000
Investment, Identifier [Axis]: Post Road Equipment Finance, LLC, Subordinated Debt 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   3,000 0
Investment, Identifier [Axis]: Post Road Equipment Finance, LLC, Subordinated Debt 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   62,599 24,500
Investment, Identifier [Axis]: Power Stop, LLC , Transportation      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,094    
Investment, Identifier [Axis]: Power Stop, LLC , Transportation      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   2,986  
Investment, Identifier [Axis]: Pregis TopCo, LLC , Paper & Packaging      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,708    
Investment, Identifier [Axis]: Pregis TopCo, LLC, Paper & Packaging      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   6,763  
Investment, Identifier [Axis]: Pretzel Parent, Inc. , Media/Entertainment      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,450 3,522  
Investment, Identifier [Axis]: Proofpoint, Inc. , Software/Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,651 6,335  
Investment, Identifier [Axis]: Pug, LLC , Media/Entertainment      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,590 4,766  
Investment, Identifier [Axis]: Questex, Inc, Media/Entertainment      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8],[9] 14,777    
Investment, Identifier [Axis]: Questex, Inc., Media/Entertainment      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (32) [8],[13] (34) [11],[14]  
Investment, Identifier [Axis]: Questex, Inc., Media/Entertainment 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11],[12]   14,837  
Investment, Identifier [Axis]: Quikrete Holdings, Inc. , Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,019    
Investment, Identifier [Axis]: Quikrete Holdings, Inc. , Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,539    
Investment, Identifier [Axis]: Quikrete Holdings, Inc., Industrials 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   1,732  
Investment, Identifier [Axis]: Quikrete Holdings, Inc., Industrials 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   6,056  
Investment, Identifier [Axis]: REP TEC Intermediate Holdings, Inc., Software/Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 24,357 [7],[8],[9] 24,481 [10],[11],[12]  
Investment, Identifier [Axis]: RMP Group, Inc. , Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[17],[18],[21] 320    
Investment, Identifier [Axis]: RMP Group, Inc., Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[19],[20],[23]   263  
Investment, Identifier [Axis]: RSC Acquisition, Inc, Financials 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8] 4,679    
Investment, Identifier [Axis]: RSC Acquisition, Inc, Financials 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] 664    
Investment, Identifier [Axis]: RSC Acquisition, Inc., Financials 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11]   1,695  
Investment, Identifier [Axis]: RSC Acquisition, Inc., Financials 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 8,961 [8] 9,007 [11]  
Investment, Identifier [Axis]: RSC Acquisition, Inc., Financials 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   0  
Investment, Identifier [Axis]: RSC Acquisition, Inc., Financials 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [8],[13] 0 [11],[14]  
Investment, Identifier [Axis]: RSC Acquisition, Inc., Financials 5      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 7,080 [7],[8] 7,116 [10],[11]  
Investment, Identifier [Axis]: RSC Acquisition, Inc., Financials 6      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 21,482 [7],[8],[9] 21,593 [10],[11],[12]  
Investment, Identifier [Axis]: RXB Holdings, Inc. , Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 9,846    
Investment, Identifier [Axis]: RXB Holdings, Inc., Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   9,823  
Investment, Identifier [Axis]: Radar Bidco SARL , Transportation      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   1,422  
Investment, Identifier [Axis]: Radiology Partners, Inc. , Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 11,013    
Investment, Identifier [Axis]: Radiology Partners, Inc., Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   10,345  
Investment, Identifier [Axis]: Raven Acquisition Holdings, LLC , Healthcare 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 9,763    
Investment, Identifier [Axis]: Raven Acquisition Holdings, LLC , Healthcare 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (1)    
Investment, Identifier [Axis]: Raven Acquisition Holdings, LLC, Healthcare 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   1  
Investment, Identifier [Axis]: Raven Acquisition Holdings, LLC, Healthcare 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   7,946  
Investment, Identifier [Axis]: Reagent Chemical and Research, LLC, Chemicals      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [8],[13] (135) [11],[14]  
Investment, Identifier [Axis]: Reagent Chemical and Research, LLC, Chemicals 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 48,903 [7],[8],[9] 52,128 [10],[11],[12]  
Investment, Identifier [Axis]: Recess Holdings, Inc. , Consumer      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 7,391    
Investment, Identifier [Axis]: Recess Holdings, Inc., Consumer      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   12,517  
Investment, Identifier [Axis]: Relativity Oda, LLC, Software/Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 7,717 [7],[8],[9] 7,717 [10],[11],[12]  
Investment, Identifier [Axis]: Renaissance Holdings Corp. , Software/Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,777    
Investment, Identifier [Axis]: Renaissance Holdings Corp., Software/Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   1,969  
Investment, Identifier [Axis]: Resolute Investment Managers, Inc. , Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,022 [8],[18],[21] 2,022 [11],[20],[23]  
Investment, Identifier [Axis]: Resolute Investment Managers, Inc., Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 991 2,433  
Investment, Identifier [Axis]: Resolute Investment Managers, Inc., Financials 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   991  
Investment, Identifier [Axis]: Revere Power, LLC, Utilities 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   8,564  
Investment, Identifier [Axis]: Revere Power, LLC, Utilities 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   756  
Investment, Identifier [Axis]: Rialto Management Group, LLC, Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (7) [8],[13] (8) [11],[14]  
Investment, Identifier [Axis]: Rialto Management Group, LLC, Financials 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 20,653 [7],[8],[9] 21,616 [10],[11],[12]  
Investment, Identifier [Axis]: Roadsafe Holdings, Inc, Industrials 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11],[12]   1,087  
Investment, Identifier [Axis]: Roadsafe Holdings, Inc., Industrials 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 7,324 [7],[8] 7,362 [10],[11]  
Investment, Identifier [Axis]: Roadsafe Holdings, Inc., Industrials 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,814 [7],[8] 6,849 [10],[11]  
Investment, Identifier [Axis]: Roadsafe Holdings, Inc., Industrials 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8],[9] 1,081    
Investment, Identifier [Axis]: Roadsafe Holdings, Inc., Industrials 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 11,994 [7],[8],[9] 12,059 [10],[11],[12]  
Investment, Identifier [Axis]: Roper Industrial Products Investment Co., LLC , Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,958    
Investment, Identifier [Axis]: Roper Industrial Products Investment Co., LLC, Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   7,509  
Investment, Identifier [Axis]: Russell Investments US Institutional Holdco, Inc., Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,494 5,544  
Investment, Identifier [Axis]: Ryan Specialty Group, LLC , Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,989 2,007  
Investment, Identifier [Axis]: S&S Holdings, LLC , Consumer      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,555    
Investment, Identifier [Axis]: S&S Holdings, LLC, Consumer      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   6,717  
Investment, Identifier [Axis]: SCIH Salt Holdings, Inc. Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] (15)    
Investment, Identifier [Axis]: SCIH Salt Holdings, Inc., Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   985  
Investment, Identifier [Axis]: SK Neptune Husky Finance SARL, Chemicals      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   650  
Investment, Identifier [Axis]: Safety Products/JHC Acquisition Corp. , Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 7,332    
Investment, Identifier [Axis]: Safety Products/JHC Acquisition Corp., Industrials 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   399  
Investment, Identifier [Axis]: Safety Products/JHC Acquisition Corp., Industrials 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   7,389  
Investment, Identifier [Axis]: Saks Global Enterprises, LLC, Consumer      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,470 2,885  
Investment, Identifier [Axis]: Saranac CLO, Ltd. 20-8A E, Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,384 1,412  
Investment, Identifier [Axis]: Saturn SHC Buyer Holdings, Inc, Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] (645)    
Investment, Identifier [Axis]: Saturn SHC Buyer Holdings, Inc., Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   0  
Investment, Identifier [Axis]: Saturn SHC Buyer Holdings, Inc., Healthcare 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 12,343 [7],[8] 12,993 [10],[11]  
Investment, Identifier [Axis]: Saturn SHC Buyer Holdings, Inc., Healthcare 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 35,308 [7],[8] 37,165 [10],[11]  
Investment, Identifier [Axis]: Saturn Sound Bidco, Ltd, Business Services 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14],[28]   (44)  
Investment, Identifier [Axis]: Saturn Sound Bidco, Ltd., Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13],[27] (41)    
Investment, Identifier [Axis]: Saturn Sound Bidco, Ltd., Business Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8],[9],[27] 24,571    
Investment, Identifier [Axis]: Saturn Sound Bidco, Ltd., Business Services 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11],[12],[28]   24,212  
Investment, Identifier [Axis]: Sculptor CLO, Ltd. 27A E, Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   1,469  
Investment, Identifier [Axis]: Sedgwick Claims Management Services, Inc., Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 7,277 7,327  
Investment, Identifier [Axis]: Sherlock Buyer Corp., Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [8],[13] 0 [11],[14]  
Investment, Identifier [Axis]: Sherlock Buyer Corp., Business Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 15,638 [7],[8],[9] 15,719 [10],[11],[12]  
Investment, Identifier [Axis]: Siena Capital Finance, LLC , Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[18],[30] 77,310    
Investment, Identifier [Axis]: Siena Capital Finance, LLC, Equity/Other Investments      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 77,310 77,310 0
Investment, Identifier [Axis]: Siena Capital Finance, LLC, Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 54,500 [8],[30] 49,500 [11],[32]  
Investment, Identifier [Axis]: Siena Capital Finance, LLC, Financials 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[20],[32]   77,310  
Investment, Identifier [Axis]: Siena Capital Finance, LLC, Subordinated Debt      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 54,500 49,500 0
Investment, Identifier [Axis]: Sierra Enterprises, LLC , Food & Beverage      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   5,097  
Investment, Identifier [Axis]: Simplifi Holdings, Inc., Media/Entertainment      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,582 [8],[13] 0 [11],[14]  
Investment, Identifier [Axis]: Simplifi Holdings, Inc., Media/Entertainment 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 49,782 [7],[8] 50,040 [10],[11]  
Investment, Identifier [Axis]: SitusAMC Holdings Corp. , Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11]   9,677  
Investment, Identifier [Axis]: SitusAMC Holdings Corp., Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8],[9] 52,004    
Investment, Identifier [Axis]: SitusAMC Holdings Corp., Financials 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   6,341  
Investment, Identifier [Axis]: Skillsoft Corp., Technology      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 199 [21] 298 [23]  
Investment, Identifier [Axis]: Smile Brands, Inc, Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11]   50  
Investment, Identifier [Axis]: Smile Brands, Inc. , Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[20],[23]   0  
Investment, Identifier [Axis]: Smile Brands, Inc., Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8] 16    
Investment, Identifier [Axis]: Smyrna Ready Mix Concrete, LLC, Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,996    
Investment, Identifier [Axis]: Sonrava Health Holdings, LLC , Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   6,108  
Investment, Identifier [Axis]: Sonrava Health Holdings, LLC, Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   1,837  
Investment, Identifier [Axis]: Sonrava Health Holdings, LLC, Healthcare 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,828    
Investment, Identifier [Axis]: Sonrava Health Holdings, LLC, Healthcare 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,233    
Investment, Identifier [Axis]: Sotera Health Holdings, LLC , Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 9,956    
Investment, Identifier [Axis]: Sotera Health Holdings, LLC, Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   9,981  
Investment, Identifier [Axis]: Sound Point CLO, Ltd. 17-1A E, Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   3,920  
Investment, Identifier [Axis]: Sound Point CLO, Ltd. 17-2A E, Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,588 1,942  
Investment, Identifier [Axis]: Sound Point CLO, Ltd. 18-3A D, Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 796 787  
Investment, Identifier [Axis]: Specialty Building Products Holdings, LLC , Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,807    
Investment, Identifier [Axis]: Specialty Building Products Holdings, LLC, Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   4,932  
Investment, Identifier [Axis]: Squan Holding Corp. , Telecom      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[20],[23]   0  
Investment, Identifier [Axis]: Squan Holding Corp., Telecom      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[18],[21] 0    
Investment, Identifier [Axis]: St. Croix Hospice Acquisition Corp., Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,738 [8] 2,752 [11]  
Investment, Identifier [Axis]: St. Croix Hospice Acquisition Corp., Healthcare 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 18,839 [7],[8],[9] 18,934 [10],[11],[12]  
Investment, Identifier [Axis]: St. Croix Hospice Acquisition Corp., Healthcare 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 24,772 [7],[8],[9] 24,901 [11],[12]  
Investment, Identifier [Axis]: Staples, Inc. , Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,580    
Investment, Identifier [Axis]: Staples, Inc., Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   7,007  
Investment, Identifier [Axis]: Starlight Parent, LLC , Software/Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 7,322    
Investment, Identifier [Axis]: Stonepeak Nile Parent, LLC , Transportation      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,387    
Investment, Identifier [Axis]: Striper Buyer, LLC Paper & Packaging      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   16,827  
Investment, Identifier [Axis]: Striper Buyer, LLC, Paper & Packaging      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8] 16,739    
Investment, Identifier [Axis]: SunMed Group Holdings, LLC , Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   12,568  
Investment, Identifier [Axis]: SunMed Group Holdings, LLC, Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] 0    
Investment, Identifier [Axis]: SunMed Group Holdings, LLC, Healthcare 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 12,503 [7],[8] 0 [11],[14]  
Investment, Identifier [Axis]: Symphony CLO, Ltd. 2012-9A ER2, Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,891 2,881  
Investment, Identifier [Axis]: TEI Intermediate, LLC, Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 22,794 [7],[8],[9] 22,790 [10],[11],[12]  
Investment, Identifier [Axis]: TEI Intermediate, LLC, Business Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (17) [8],[13] (18) [11],[14]  
Investment, Identifier [Axis]: TEI Intermediate, LLC, Business Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 431 [8],[13] 358 [11],[14]  
Investment, Identifier [Axis]: Tax Defense Network, LLC , Consumer 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[18],[21] 0    
Investment, Identifier [Axis]: Tax Defense Network, LLC , Consumer 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[18],[21] 0    
Investment, Identifier [Axis]: Tax Defense Network, LLC, Consumer      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[16]   404  
Investment, Identifier [Axis]: Tax Defense Network, LLC, Consumer 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [8],[15] 0 [11],[20],[23]  
Investment, Identifier [Axis]: Tax Defense Network, LLC, Consumer 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [8],[15] 72 [11],[16]  
Investment, Identifier [Axis]: Tax Defense Network, LLC, Consumer 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,669 [8],[15] 5,342 [11],[16]  
Investment, Identifier [Axis]: Tax Defense Network, LLC, Consumer 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[20],[23]   0  
Investment, Identifier [Axis]: Team Health Holdings, Inc., Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   2,649  
Investment, Identifier [Axis]: Tecta America Corp. , Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,502    
Investment, Identifier [Axis]: Tecta America Corp., Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   8,803  
Investment, Identifier [Axis]: Tennenbaum Waterman Fund, LP, Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,503 [18],[22],[27] 5,802 [20],[24],[28]  
Investment, Identifier [Axis]: Tennenbaum Waterman Fund, LP, Equity/Other Investments      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,503 5,802 0
Investment, Identifier [Axis]: The NPD Group, LP, Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [8],[13] 52,232 [10],[11]  
Investment, Identifier [Axis]: The NPD Group, LP, Business Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 52,102 [7],[8] 573 [11],[14]  
Investment, Identifier [Axis]: Therapy Brands Holdings, LLC , Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   4,944  
Investment, Identifier [Axis]: Therapy Brands Holdings, LLC, Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,601 [7],[8] 5,406 [10],[11]  
Investment, Identifier [Axis]: Therapy Brands Holdings, LLC, Healthcare 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8] 4,840    
Investment, Identifier [Axis]: Tivity Health, Inc., Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 24,414 [7],[8] 24,537 [10],[11]  
Investment, Identifier [Axis]: TransDigm, Inc. , Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,935    
Investment, Identifier [Axis]: TransDigm, Inc., Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   5,963  
Investment, Identifier [Axis]: Travelpro Products, Inc. , Consumer      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[18],[21],[27] 465    
Investment, Identifier [Axis]: Travelpro Products, Inc., Consumer      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[20],[23],[28]   751  
Investment, Identifier [Axis]: Traverse Midstream Partners, LLC , Energy      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 12,865    
Investment, Identifier [Axis]: Traverse Midstream Partners, LLC, Energy      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   12,898  
Investment, Identifier [Axis]: Trimaran CAVU 2021-2A, Ltd. 21-2A E, Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   2,931  
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corp, Business Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   5,878  
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corp., Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   0  
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corp., Business Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   8,522  
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corp., Business Services 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   29,212  
Investment, Identifier [Axis]: Triple Lift, Inc., Software/Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (188) [8],[13] (188) [11],[14]  
Investment, Identifier [Axis]: Triple Lift, Inc., Software/Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 37,610 [7],[8],[9] 37,806 [10],[11],[12]  
Investment, Identifier [Axis]: Triton Water Holdings, Inc. , Food & Beverage      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 8,953    
Investment, Identifier [Axis]: Triton Water Holdings, Inc., Food & Beverage 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   7,286  
Investment, Identifier [Axis]: Triton Water Holdings, Inc., Food & Beverage 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   1,746  
Investment, Identifier [Axis]: Truck Hero, Inc. , Transportation 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,051    
Investment, Identifier [Axis]: Truck Hero, Inc. , Transportation 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 7,492    
Investment, Identifier [Axis]: Truck Hero, Inc., Transportation 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   1,492  
Investment, Identifier [Axis]: Truck Hero, Inc., Transportation 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   8,180  
Investment, Identifier [Axis]: Trysail CLO, Ltd. 21-1A E, Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   1,491  
Investment, Identifier [Axis]: Trystar, LLC, Utilities 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [8],[13] (118) [11],[14]  
Investment, Identifier [Axis]: Trystar, LLC, Utilities 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [8],[13] (59) [11],[14]  
Investment, Identifier [Axis]: Trystar, LLC, Utilities 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 10,416 [7],[8],[9] 10,370 [10],[11],[12]  
Investment, Identifier [Axis]: Trystar, LLC, Utilities 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 24,673 [7],[8],[9] 24,564 [10],[11],[12]  
Investment, Identifier [Axis]: UKG, Inc., Technology      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 9,696 9,772  
Investment, Identifier [Axis]: US Anesthesia Partners, Inc. , Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,856    
Investment, Identifier [Axis]: US Anesthesia Partners, Inc., Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   6,942  
Investment, Identifier [Axis]: US Oral Surgery Management Holdco, LLC , Healthcare 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   17,668  
Investment, Identifier [Axis]: US Oral Surgery Management Holdco, LLC, Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,050 [8] 5,050 [11]  
Investment, Identifier [Axis]: US Oral Surgery Management Holdco, LLC, Healthcare 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [8],[13] 0 [11],[14]  
Investment, Identifier [Axis]: US Oral Surgery Management Holdco, LLC, Healthcare 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,997 [7],[8] 6,997 [10],[11]  
Investment, Identifier [Axis]: US Oral Surgery Management Holdco, LLC, Healthcare 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,098 [7],[8] 6,098 [10],[11]  
Investment, Identifier [Axis]: US Oral Surgery Management Holdco, LLC, Healthcare 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8] 17,668    
Investment, Identifier [Axis]: US Salt Investors, LLC, Chemicals      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [8],[13] 0 [11],[14]  
Investment, Identifier [Axis]: US Salt Investors, LLC, Chemicals 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 26,794 [7],[8] 27,311 [10],[11]  
Investment, Identifier [Axis]: United Airlines, Inc. , Transportation      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,731    
Investment, Identifier [Axis]: United Airlines, Inc., Transportation 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   1,966  
Investment, Identifier [Axis]: United Airlines, Inc., Transportation 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   3,755  
Investment, Identifier [Axis]: University Support Services, LLC , Education      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   7,294  
Investment, Identifier [Axis]: University Support Services, LLC, Education      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,042    
Investment, Identifier [Axis]: Urban One, Inc., Media/Entertainment      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 876 [18] 972 [20]  
Investment, Identifier [Axis]: VS Buyer, LLC, Software/Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   1,074  
Investment, Identifier [Axis]: Varicent Intermediate Holdings Corp., Software/Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 20,143 [7],[8],[9] 19,113 [10],[11],[12]  
Investment, Identifier [Axis]: Varicent Intermediate Holdings Corp., Software/Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (50) [8],[13] (63) [11],[14]  
Investment, Identifier [Axis]: Varicent Intermediate Holdings Corp., Software/Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (33) [8],[13] (35) [11],[14]  
Investment, Identifier [Axis]: Venga Finance SARL, Telecom      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,888 3,925  
Investment, Identifier [Axis]: Venture CDO, Ltd. 16-23A ER2, Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,612 2,806  
Investment, Identifier [Axis]: Venture CLO 43, Ltd. 21-43A E, Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,774 2,807  
Investment, Identifier [Axis]: Venture Global Calcasieu Pass, LLC, Energy      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,621    
Investment, Identifier [Axis]: Venture Global LNG, Inc., Energy      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,863    
Investment, Identifier [Axis]: Victors CCC Buyer, LLC , Business Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   23,698  
Investment, Identifier [Axis]: Victors CCC Buyer, LLC, Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,559 [8] 1,567 [11]  
Investment, Identifier [Axis]: Victors CCC Buyer, LLC, Business Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [8],[13] 0 [11],[14]  
Investment, Identifier [Axis]: Victors CCC Buyer, LLC, Business Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8] 23,577    
Investment, Identifier [Axis]: Victory Buyer, LLC , Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 9,258    
Investment, Identifier [Axis]: Victory Buyer, LLC, Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 44,610 [7],[8] 43,690 [10],[11]  
Investment, Identifier [Axis]: Victory Buyer, LLC, Industrials 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   9,253  
Investment, Identifier [Axis]: Virgin Media Bristol, LLC , Telecom      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   2,472  
Investment, Identifier [Axis]: WCG Purchaser Corp. , Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,421    
Investment, Identifier [Axis]: WCG Purchaser Corp., Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   4,938  
Investment, Identifier [Axis]: WEC US Holdings, Ltd., Utilities      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   5,505  
Investment, Identifier [Axis]: WHCG Purchaser III, Inc. , Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [8],[18],[21] 8,738 [11],[16]  
Investment, Identifier [Axis]: WHCG Purchaser III, Inc., Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 9,176 [8],[15] 22,824 [11]  
Investment, Identifier [Axis]: WHCG Purchaser III, Inc., Healthcare 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 23,448 [8] 0 [11],[20],[23]  
Investment, Identifier [Axis]: WIN Holdings III Corp.), Consumer 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   10,016  
Investment, Identifier [Axis]: WIN Holdings III Corp., Consumer      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   1,986  
Investment, Identifier [Axis]: WIN Holdings III Corp., Consumer 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,986 [8],[13] 41,683 [10],[11]  
Investment, Identifier [Axis]: WIN Holdings III Corp., Consumer 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8] 41,683    
Investment, Identifier [Axis]: WIN Holdings III Corp., Consumer 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[8] 9,965    
Investment, Identifier [Axis]: WPNT, LLC , Media/Entertainment      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[17],[18],[21],[30] 0    
Investment, Identifier [Axis]: WPNT, LLC, Equity/Other Investments      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   0 $ 0
Investment, Identifier [Axis]: WPNT, LLC, Media/Entertainment      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[19],[20],[23],[32]   0  
Investment, Identifier [Axis]: WaterBridge Midstream Operating, LLC , Energy      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 12,728    
Investment, Identifier [Axis]: WaterBridge Midstream Operating, LLC, Energy      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   9,921  
Investment, Identifier [Axis]: Waterbridge NDB Operating, LLC , Energy      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,081    
Investment, Identifier [Axis]: Waterbridge NDB Operating, LLC, Energy      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   2,990  
Investment, Identifier [Axis]: Watlow Electric Manufacturing, Co., Industrials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   4,646  
Investment, Identifier [Axis]: Waystar Technologies, Inc., Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   1,326  
Investment, Identifier [Axis]: West Coast Dental Services, Inc. Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   2,740  
Investment, Identifier [Axis]: West Coast Dental Services, Inc., Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] 3,575    
Investment, Identifier [Axis]: West Coast Dental Services, Inc., Healthcare 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 27,595 [7],[8] 27,503 [10],[11]  
Investment, Identifier [Axis]: West Coast Dental Services, Inc., Healthcare 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,648 [7],[8] 1,648 [10],[11]  
Investment, Identifier [Axis]: WestJet Loyalty, LP , Transportation      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,725    
Investment, Identifier [Axis]: WestJet Loyalty, LP, Transportation      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   5,774  
Investment, Identifier [Axis]: Westwood Professional Services, Inc, Business Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[14]   3,050  
Investment, Identifier [Axis]: Westwood Professional Services, Inc., Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 45,075 [7],[8],[9] 44,868 [10],[11],[12]  
Investment, Identifier [Axis]: Westwood Professional Services, Inc., Business Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] 4,454    
Investment, Identifier [Axis]: Westwood Professional Services, Inc., Business Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [8],[13] (65) [11],[14]  
Investment, Identifier [Axis]: White Cap Supply Holdings, LLC, Consumer      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,270 6,843  
Investment, Identifier [Axis]: Whitehorse, Ltd. 14-1A E, Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 406 [8],[18],[27] 821 [11],[20],[28]  
Investment, Identifier [Axis]: Wind River CLO, Ltd. 14-2A FR, Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 497 855  
Investment, Identifier [Axis]: Windsor Holdings III, LLC , Chemicals      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,260    
Investment, Identifier [Axis]: Windsor Holdings III, LLC , Chemicals      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   3,312  
Investment, Identifier [Axis]: World Business Lenders, LLC , Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[18],[21] 1,405    
Investment, Identifier [Axis]: World Business Lenders, LLC, Financials      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[20],[23]   1,405  
Investment, Identifier [Axis]: X Corp. , Media/Entertainment 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,429    
Investment, Identifier [Axis]: X Corp. , Media/Entertainment 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 9,710    
Investment, Identifier [Axis]: YummyEarth, Inc., Food & Beverage      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [8],[18],[21] 0 [11],[20],[23]  
Investment, Identifier [Axis]: Zais CLO 13, Ltd. 19-13A D1, Diversified Investment Vehicles      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   2,915  
Investment, Identifier [Axis]: Zayo Group Holdings, Inc , Telecom      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,509    
Investment, Identifier [Axis]: Zayo Group Holdings, Inc. , Telecom      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 7,982    
Investment, Identifier [Axis]: Zayo Group Holdings, Inc., Telecom 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   1,483  
Investment, Identifier [Axis]: Zayo Group Holdings, Inc., Telecom 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   7,859  
Investment, Identifier [Axis]: Zelis Cost Management Buyer, Inc., Healthcare      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   1,867  
Investment, Identifier [Axis]: Zendesk, Inc. Software/Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[43],[44]   65,525  
Investment, Identifier [Axis]: Zendesk, Inc., Software/Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[13] 5,010    
Investment, Identifier [Axis]: Zendesk, Inc., Software/Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8] 65,204    
FBLC Senior Loan Fund, LLC      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Total assets 990,492 1,151,336  
Fair Value $ 923,466 $ 1,103,160  
Number of Portfolio companies in SLF | portfolioCompany 176 210  
FBLC Senior Loan Fund, LLC | Investment, Identifier [Axis]: Largest Portfolio Company Investment      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value $ 16,643 $ 17,223  
FBLC Senior Loan Fund, LLC | Investment, Identifier [Axis]: Top Five Largest Portfolio Company Investments      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value $ 70,223 $ 72,582  
FBLC Senior Loan Fund, LLC | Weighted average      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Weighted Average Current Yield for Total Portfolio 9.00% 9.10%  
[1] Percentages are based on net assets attributable to common stock as of June 30, 2025.
[2] Unless otherwise indicated, all investments in the consolidated schedules of investments are non-affiliated, non-controlled investments.
[3] Unless otherwise indicated, all of the Company's investments or a portion thereof are pledged as collateral under the JPM Revolver Facility.
[4] Percentages are based on net assets attributable to common stock as of December 31, 2024.
[5] Unless otherwise indicated, all investments in the consolidated schedules of investments are non-affiliated, non-controlled investments.
[6] Unless otherwise indicated, all of the Company's investments or a portion thereof are pledged as collateral under the JPM Revolver Facility.
[7] The Company's investment or a portion thereof is pledged as collateral under the JPM Credit Facility.
[8] The fair value of investments with respect to securities for which market quotations are not readily available is determined in good faith by the Company's Board of Directors (as defined below) as required by the 1940 Act. Such investments are valued using significant unobservable inputs (See Note 3 to the consolidated financial statements).
[9] The Company's investment or a portion thereof is pledged as collateral under the Wells Fargo Credit Facility. Individual investments can be divided into parts which are pledged to separate credit facilities.
[10] The Company's investment or a portion thereof is pledged as collateral under the JPM Credit Facility.
[11] The fair value of investments with respect to securities for which market quotations are not readily available is determined in good faith by the Company's Board of Directors (as defined below) as required by the 1940 Act. Such investments are valued using significant unobservable inputs (See Note 3 to the consolidated financial statements).
[12] The Company's investment or a portion thereof is pledged as collateral under the Wells Fargo Credit Facility. Individual investments can be divided into parts which are pledged to separate credit facilities.
[13] Position or portion thereof is an unfunded loan commitment, and no interest is being earned on the unfunded portion. The investment may be subject to an unused/letter of credit facility fee. The negative fair value, if applicable, is the result of the capitalized discount on the loan or the unfunded commitment being valued below par. The negative amortized cost, if applicable, is the result of the capitalized discount being greater than the principal amount outstanding on the loan. Please refer to Note 7 - Commitments and Contingencies for additional details.
[14] Position or portion thereof is an unfunded loan commitment, and no interest is being earned on the unfunded portion. The investment may be subject to an unused/letter of credit facility fee. The negative fair value, if applicable, is the result of the capitalized discount on the loan or the unfunded commitment being valued below par. The negative amortized cost, if applicable, is the result of the capitalized discount being greater than the principal amount outstanding on the loan. Please refer to Note 7 - Commitments and Contingencies for additional details.
[15] The investment is on non-accrual status as of June 30, 2025. As of June 30, 2025, $30.0 million of the cost and $13.2 million of fair value of MGTF Radio Company, LLC is considered to be on non-accrual status.
[16] The investment is on non-accrual status as of December 31, 2024.
[17] Investments are held in the taxable wholly-owned, consolidated subsidiary, 54th Street Equity Holdings, Inc.
[18] Securities exempt from registration under the Securities Act of 1933 (as defined below), and may be deemed to be “restricted securities”. As of June 30, 2025, the aggregate fair value of these securities is $580.2 million or 31.3% of the Company’s net assets. The initial acquisition dates have been included for such securities.
[19] Investments are held in the taxable wholly-owned, consolidated subsidiary, 54th Street Equity Holdings, Inc.
[20] Securities exempt from registration under the Securities Act of 1933 (as defined below), and may be deemed to be “restricted securities”. As of December 31, 2024, the aggregate fair value of these securities is $688.5 million or 36.0% of the Company’s net assets. The initial acquisition dates have been included for such securities.
[21] Non-income producing at June 30, 2025.
[22] The provisions of the 1940 Act classify investments further based on the level of ownership that the Company maintains in a particular portfolio company. As defined in the 1940 Act, a company is generally deemed as "non-affiliated" when the Company owns less than 5% of a portfolio company's outstanding voting securities and "affiliated" when the Company owns 5% or more of a portfolio company's outstanding voting securities. The Company classifies this investment as "affiliated".
[23] Non-income producing at December 31, 2024.
[24] The provisions of the 1940 Act classify investments further based on the level of ownership that the Company maintains in a particular portfolio company. As defined in the 1940 Act, a company is generally deemed as "non-affiliated" when the Company owns less than 5% of a portfolio company's outstanding voting securities and "affiliated" when the Company owns 5% or more of a portfolio company's outstanding voting securities. The Company classifies this investment as "affiliated".
[25] Investments are held in the taxable wholly-owned, consolidated subsidiary, FBCC EEF Holdings LLC.
[26] Investments are held in the taxable wholly-owned, consolidated subsidiary, FBCC EEF Holdings LLC.
[27] All of the Company's investments, except the investments noted by this footnote, are qualifying assets under Section 55(a) of the Investment Company Act of 1940, as amended (the "1940 Act"). Under the 1940 Act, the Company may not acquire any non-qualifying asset unless, at the time the acquisition is made, qualifying assets represent at least 70% of the Company's total assets. At June 30, 2025, qualifying assets represent 90.8% of the Company's total assets.
[28] All of the Company's investments, except the investments noted by this footnote, are qualifying assets under Section 55(a) of the Investment Company Act of 1940, as amended (the "1940 Act"). Under the 1940 Act, the Company may not acquire any non-qualifying asset unless, at the time the acquisition is made, qualifying assets represent at least 70% of the Company's total assets. At December 31, 2024, qualifying assets represent 88.5% of the Company's total assets.
[29] The Company's investment is held through the consolidated subsidiary, Kahala Aviation Holdings, LLC, which owns 49% of the operating company, Danish CRJ LTD.
[30] The provisions of the 1940 Act classify investments based on the level of control that the Company maintains in a particular portfolio company. As defined in the 1940 Act, a company is generally presumed to be “non-controlled” when the Company owns 25% or less of the portfolio company’s outstanding voting securities and/or does not have the power to exercise control over the management or policies of such portfolio company. A company is generally presumed to be “controlled” when the Company owns more than 25% of the portfolio company’s outstanding voting securities and/or has the power to exercise control over the management or policies of such portfolio company. The Company classifies this investment as “controlled”.
[31] The Company's investment is held through the consolidated subsidiary, Kahala Aviation Holdings, LLC, which owns 49% of the operating company, Danish CRJ LTD.
[32] The provisions of the 1940 Act classify investments based on the level of control that the Company maintains in a particular portfolio company. As defined in the 1940 Act, a company is generally presumed to be “non-controlled” when the Company owns 25% or less of the portfolio company’s outstanding voting securities and/or does not have the power to exercise control over the management or policies of such portfolio company. A company is generally presumed to be “controlled” when the Company owns more than 25% of the portfolio company’s outstanding voting securities and/or has the power to exercise control over the management or policies of such portfolio company. The Company classifies this investment as “controlled”.
[33] The Company's investment falls under the definition of a significant subsidiary, as it exceeded the threshold of at least one of the tests under Rule 4-08(g), or exceeded the threshold of at least one of the tests under Rule 3-09. See Note 3 for summarized financial information.
[34] The Company's investment falls under the definition of a significant subsidiary, as it exceeded the threshold of at least one of the tests under Rule 4-08(g), or exceeded the threshold of at least one of the tests under Rule 3-09. See Note 3 for summarized financial information.
[35] The Company's investment is held through the consolidated subsidiaries, Kahala Aviation Holdings, LLC and Kahala Aviation US, Inc., which own 100% of the equity of the operating company, Kahala US OpCo LLC.
[36] The Company's investment is held through the consolidated subsidiary, Kahala Aviation Holdings, LLC, which owns 100% of the equity of the operating company, Kahala Aviation, LLC.
[37] The Company's investment is held through the consolidated subsidiaries, Kahala Aviation Holdings, LLC and Kahala Aviation US, Inc., which own 100% of the equity of the operating company, Kahala US OpCo LLC.
[38] The Company's investment is held through the consolidated subsidiary, Kahala Aviation Holdings, LLC, which owns 100% of the equity of the operating company, Kahala Aviation, LLC.
[39] The investment is held through BSP TCAP Acquisition Holdings LP, which is an affiliated acquisition entity. Due to certain restrictions, such as limits on the number of partners allowable within the equity structures of the newly acquired investments, these investments are still held within the acquisition entity as of June 30, 2025.
[40] The investment is held through BSP TCAP Acquisition Holdings LP, which is an affiliated acquisition entity. Due to certain restrictions, such as limits on the number of partners allowable within the equity structures of the newly acquired investments, these investments are still held within the acquisition entity as of December 31, 2024
[41] The Collateralized Securities - subordinated notes are treated as equity investments and are entitled to recurring distributions which are generally equal to the remaining cash flow of the payments made by the underlying fund’s securities less contractual payments to debt holders and fund expenses. The estimated yield indicated is based upon a current projection of the amount and timing of these recurring distributions and the estimated amount of repayment of principal upon termination. Such projections are periodically reviewed and adjusted, and the estimated yield may not ultimately be realized.
[42] The Collateralized Securities - subordinated notes are treated as equity investments and are entitled to recurring distributions which are generally equal to the remaining cash flow of the payments made by the underlying fund’s securities less contractual payments to debt holders and fund expenses. The estimated yield indicated is based upon a current projection of the amount and timing of these recurring distributions and the estimated amount of repayment of principal upon termination. Such projections are periodically reviewed and adjusted, and the estimated yield may not ultimately be realized.
[43] 40% of the Company’s investment is pledged as collateral under the total return swap agreement with Nomura.
[44] The Company’s investment or a portion thereof is held through a total return swap agreement with Nomura Global Financial Products Inc. (“Nomura”).