v3.26.1
Fair Value of Financial Instruments - Schedule of SLF’s Portfolio (Details)
$ in Thousands
Mar. 31, 2026
USD ($)
portfolioCompany
Dec. 31, 2025
USD ($)
portfolioCompany
Dec. 31, 2024
USD ($)
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Total assets $ 4,192,198 $ 4,247,887  
Fair Value 4,050,457 [1],[2],[3] 4,071,008 [4],[5],[6]  
Investment, Identifier [Axis]: Urban One, Inc. | Media      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7]   490  
Investment, Identifier [Axis]: 1236904 BC, Ltd. | Software 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 581 [8],[9] 3,511 [10],[11]  
Investment, Identifier [Axis]: 1236904 BC, Ltd. | Software 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,489 [8],[9],[12] 4,588 [10],[11],[13]  
Investment, Identifier [Axis]: AAdvantage Loyalty IP, Ltd., Passenger Airlines      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,937 3,997  
Investment, Identifier [Axis]: ACE Solutions, LLC | Oil, Gas & Consumable Fuels 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9] (47)    
Investment, Identifier [Axis]: ACE Solutions, LLC | Oil, Gas & Consumable Fuels 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[14] (113)    
Investment, Identifier [Axis]: ACE Solutions, LLC | Oil, Gas & Consumable Fuels 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[9] 10,392    
Investment, Identifier [Axis]: ADCS Clinics Intermediate Holdings, LLC | Health Care Providers & Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 119 [9] 123 [11]  
Investment, Identifier [Axis]: ADCS Clinics Intermediate Holdings, LLC | Health Care Providers & Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 650 [9],[14] 243 [11],[15]  
Investment, Identifier [Axis]: ADCS Clinics Intermediate Holdings, LLC | Health Care Providers & Services 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,697 [8],[9] 3,825 [10],[11]  
Investment, Identifier [Axis]: ADCS Clinics Intermediate Holdings, LLC | Health Care Providers & Services 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 18,030 [8],[9] 18,658 [10],[11]  
Investment, Identifier [Axis]: ADMI Corp., Health Care Providers & Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,657 2,669  
Investment, Identifier [Axis]: AIG CLO, Ltd. 21-1A F, Capital Markets      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,320 1,320  
Investment, Identifier [Axis]: ARC Falcon I, Inc., Chemicals      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,900 4,955  
Investment, Identifier [Axis]: Accel International Holdings, LLC | Electrical Equipment 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [9],[14] (21) [11],[15]  
Investment, Identifier [Axis]: Accel International Holdings, LLC | Electrical Equipment 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 27,685 [8],[9],[12] 27,560 [10],[11],[13]  
Investment, Identifier [Axis]: Acrisure, LLC, Insurance      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,976 5,154  
Investment, Identifier [Axis]: Adelaide Borrower, LLC | Software 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [9],[14] 0 [11],[15]  
Investment, Identifier [Axis]: Adelaide Borrower, LLC | Software 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 599 [9],[14] 898 [11],[15]  
Investment, Identifier [Axis]: Adelaide Borrower, LLC | Software 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 35,895 [8],[9],[12] 35,895 [10],[11],[13]  
Investment, Identifier [Axis]: Adtalem Global Education, Inc., Diversified Consumer Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   238  
Investment, Identifier [Axis]: Alera Group, Inc. | Insurance      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 21,377 [8],[12] 22,528 [10],[13]  
Investment, Identifier [Axis]: Alera Group, Inc., Insurance      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 7,497 7,794  
Investment, Identifier [Axis]: Allwyn Entertainment Financing US, LLC, Hotels, Restaurants & Leisure      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,860 6,860  
Investment, Identifier [Axis]: American Auto Auction Group, LLC, Commercial Services & Supplies      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,979    
Investment, Identifier [Axis]: American Rock Salt Company, LLC | Chemicals 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,775 [8] 1,516 [10]  
Investment, Identifier [Axis]: American Rock Salt Company, LLC | Chemicals 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,276 [8],[9] 4,855 [10],[11]  
Investment, Identifier [Axis]: American Rock Salt Company, LLC, Chemicals      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   1,570  
Investment, Identifier [Axis]: American Rock Salt Company, LLC, Chemicals, S+ 7.25% (11.03%)      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,706    
Investment, Identifier [Axis]: Amylu Borrower Sub, LLC | Food Products 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,138 [9],[14] 0 [11],[15]  
Investment, Identifier [Axis]: Amylu Borrower Sub, LLC | Food Products 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [9],[14] 0 [11],[15]  
Investment, Identifier [Axis]: Amylu Borrower Sub, LLC | Food Products 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 39,336 [8],[9] 39,436 [10],[11]  
Investment, Identifier [Axis]: Aprio Advisory Group, LLC | Financial Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (107) [9],[14] (112) [11],[15]  
Investment, Identifier [Axis]: Aprio Advisory Group, LLC | Financial Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 295 [9],[14] (9) [11],[15]  
Investment, Identifier [Axis]: Arch Global Precision, LLC | Machinery 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,197 [9] 938 [11],[15]  
Investment, Identifier [Axis]: Arch Global Precision, LLC | Machinery 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 801 [9],[14] 2,241 [11]  
Investment, Identifier [Axis]: Arch Global Precision, LLC | Machinery 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,972 [8],[9],[12] 7,112 [10],[11],[13]  
Investment, Identifier [Axis]: Arches Buyer, Inc., Media      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,870 5,923  
Investment, Identifier [Axis]: Arcline FM Holdings, LLC, Aerospace & Defense      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,964 4,989  
Investment, Identifier [Axis]: Arctic Holdco, LLC | Trading Companies & Distributors 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,235 [9],[14] 3,243 [11],[15]  
Investment, Identifier [Axis]: Arctic Holdco, LLC | Trading Companies & Distributors 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,159 [9],[14] 632 [11],[15]  
Investment, Identifier [Axis]: Arctic Holdco, LLC | Trading Companies & Distributors 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 45,806 [8],[9],[12] 45,922 [10],[11],[13]  
Investment, Identifier [Axis]: Armada Parent, Inc. | Aerospace & Defense 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,831 [9] 3,841 [11]  
Investment, Identifier [Axis]: Armada Parent, Inc. | Aerospace & Defense 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [9],[14] 0 [11],[15]  
Investment, Identifier [Axis]: Armada Parent, Inc. | Aerospace & Defense 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 55,353 [8],[9] 55,492 [10],[11]  
Investment, Identifier [Axis]: Artera Services, LLC, Construction & Engineering      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,680 4,440  
Investment, Identifier [Axis]: Artifact Bidco, Inc | Software 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[14] 0    
Investment, Identifier [Axis]: Artifact Bidco, Inc. | Software 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[15]   0  
Investment, Identifier [Axis]: Artifact Bidco, Inc. | Software 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [9],[14] 0 [11],[15]  
Investment, Identifier [Axis]: Artifact Bidco, Inc. | Software 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 10,875 [8],[9],[12] 10,875 [10],[11],[13]  
Investment, Identifier [Axis]: Ascend Learning, LLC , Diversified Consumer Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,866 3,984  
Investment, Identifier [Axis]: Ascensus Group Holdings, Inc. | Financial Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 16,850 16,600 [11]  
Investment, Identifier [Axis]: Ascensus Group Holdings, Inc., Financial Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 7,356 7,472  
Investment, Identifier [Axis]: Athenahealth Group, Inc., Health Care Technology      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 7,747 9,935  
Investment, Identifier [Axis]: Athletico Management, LLC, Health Care Providers & Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   3,577  
Investment, Identifier [Axis]: AuditBoard, Inc. | Software 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 10,735 [9] 10,898 [11]  
Investment, Identifier [Axis]: AuditBoard, Inc. | Software 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (65) [9],[14] 0 [15]  
Investment, Identifier [Axis]: AuditBoard, Inc. | Software 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 22,544 [8],[9],[12] 22,887 [10],[11]  
Investment, Identifier [Axis]: AuditBoard, Inc. | Software 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,655 [8],[9],[12] 5,742 [10],[11]  
Investment, Identifier [Axis]: Avalara, Inc, Software      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   5,992  
Investment, Identifier [Axis]: Aventine Holdings, LLC | Entertainment      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 38,945 [9] 41,466 [10],[11]  
Investment, Identifier [Axis]: Aventine Holdings, LLC | Entertainment 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 9,895 [9] 9,809 [10],[11]  
Investment, Identifier [Axis]: Aventine Holdings, LLC | Entertainment 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 24,314 [9],[12] 24,777 [10],[11],[13]  
Investment, Identifier [Axis]: Axiom Global, Inc. | Professional Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 46,541 [8],[9],[12] 46,659 [10],[11],[13]  
Investment, Identifier [Axis]: Azurite Intermediate Holdings, Inc. | Software 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[14] (91)    
Investment, Identifier [Axis]: Azurite Intermediate Holdings, Inc. | Software 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 22,073 [9] 22,639 [11]  
Investment, Identifier [Axis]: Azurite Intermediate Holdings, Inc. | Software 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 9,712 [9] 0 [11],[15]  
Investment, Identifier [Axis]: Azurite Intermediate Holdings, Inc. | Software 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11]   9,961  
Investment, Identifier [Axis]: BCPE Oceandrive Buyer, Inc. | Health Care Providers & Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 12,529 [9],[16],[17],[18] 12,528 [7],[11],[13],[19],[20]  
Investment, Identifier [Axis]: BCPE Oceandrive Buyer, Inc. | Health Care Providers & Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,349 [9],[18] 0 [11],[15],[20]  
Investment, Identifier [Axis]: BCPE Oceandrive Buyer, Inc. | Health Care Providers & Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,198 [9],[18] 4,984 [11],[20]  
Investment, Identifier [Axis]: BCPE Oceandrive Buyer, Inc. | Health Care Providers & Services 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 8,664 [9],[18] 8,307 [11],[20]  
Investment, Identifier [Axis]: BCPE Oceandrive Buyer, Inc., Equity/Other Investments      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 12,529 12,528 $ 0
Investment, Identifier [Axis]: BCPE Oceandrive Buyer, Inc., Senior Secured First Lien Debt      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   0 0
Investment, Identifier [Axis]: BCPE Oceandrive Buyer, Inc., Senior Secured First Lien Debt 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,349 0 0
Investment, Identifier [Axis]: BCPE Oceandrive Buyer, Inc., Senior Secured First Lien Debt 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 8,664 8,307 0
Investment, Identifier [Axis]: BCPE Oceandrive Buyer, Inc., Senior Secured First Lien Debt 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,198 4,984 0
Investment, Identifier [Axis]: Battalion CLO, Ltd. 21-17A F, Capital Markets      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 281 570  
Investment, Identifier [Axis]: Bayou Holdings Buyer, Inc. | Professional Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (28) [9],[14] (29) [11],[15]  
Investment, Identifier [Axis]: Bayou Holdings Buyer, Inc. | Professional Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (30) [9],[14] (31) [11],[15]  
Investment, Identifier [Axis]: Bayou Holdings Buyer, Inc. | Professional Services 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 21,151 [8],[9] 21,200 [10],[11]  
Investment, Identifier [Axis]: Beach Acquisition Bidco, LLC, Textiles, Apparel & luxury goods      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,448 1,460  
Investment, Identifier [Axis]: Bella Holding Co., LLC , Health Care Providers & Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 7,982    
Investment, Identifier [Axis]: Bella Holding Co., LLC, Health Care Providers & Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   8,047  
Investment, Identifier [Axis]: Belron Finance 2019, LLC, Diversified Consumer Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,708 5,756  
Investment, Identifier [Axis]: Big Apple Advisory, LLC | Financial Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,108 [9],[14] 5,209 [11],[15]  
Investment, Identifier [Axis]: Big Apple Advisory, LLC | Financial Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [9],[14] 0 [11],[15]  
Investment, Identifier [Axis]: Big Apple Advisory, LLC | Financial Services 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 47,047 [8],[9],[12] 47,166 [10],[11],[13]  
Investment, Identifier [Axis]: Bingo Group Buyer, Inc. | Commercial Services & Supplies 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,547 [9] 0 [11],[15]  
Investment, Identifier [Axis]: Bingo Group Buyer, Inc. | Commercial Services & Supplies 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,687 [9] 1,551 [11]  
Investment, Identifier [Axis]: Bingo Group Buyer, Inc. | Commercial Services & Supplies 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [9],[14] 1,691 [11]  
Investment, Identifier [Axis]: Bingo Group Buyer, Inc. | Commercial Services & Supplies 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 20 [9],[14] 20 [11],[15]  
Investment, Identifier [Axis]: Bingo Group Buyer, Inc. | Commercial Services & Supplies 5      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,396 [8],[9],[12] 5,410 [10],[11],[13]  
Investment, Identifier [Axis]: Black Mountain Sand, LLC | Energy Equipment & Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,304 [9],[17],[21] 1,304 [7],[11],[19],[22]  
Investment, Identifier [Axis]: Blackhawk Network Holdings, Inc., Professional Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,843 4,944  
Investment, Identifier [Axis]: Blackstone CQP Holdco, LP, Oil, Gas & Consumable Fuels      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   4,929  
Investment, Identifier [Axis]: CCI Buyer, Inc. | Wireless Telecommunication Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [9],[14] 0 [11],[15]  
Investment, Identifier [Axis]: CCI Buyer, Inc. | Wireless Telecommunication Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 51,998 [8],[9],[12] 52,129 [10],[11],[13]  
Investment, Identifier [Axis]: CD&R Hydra Buyer, Inc., Industrial Conglomerates      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 8,160 6,182  
Investment, Identifier [Axis]: CNT Holdings I Corp., Personal Care Products      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,009 6,043  
Investment, Identifier [Axis]: CQP Holdco, LP, Oil, Gas & Consumable Fuels      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,888    
Investment, Identifier [Axis]: CRS-SPV, Inc. | Chemicals      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,008 [9],[16],[17],[23] 2,008 [7],[11],[19],[24]  
Investment, Identifier [Axis]: CRS-SPV, Inc., Equity/Other Investments      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,008 2,008 1,704
Investment, Identifier [Axis]: Capstone Acquisition Holdings, Inc. | Air Freight & Logistics 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 207 [9] 208 [11]  
Investment, Identifier [Axis]: Capstone Acquisition Holdings, Inc. | Air Freight & Logistics 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 20,498 [8],[9] 20,550 [10],[11]  
Investment, Identifier [Axis]: Carlyle GMS CLO, 16-3A FRR, Capital Markets      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,823 1,823  
Investment, Identifier [Axis]: Carr, Riggs & Ingram Capital, LLC | Financial Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,922 [9],[14] 1,592 [11],[15]  
Investment, Identifier [Axis]: Carr, Riggs & Ingram Capital, LLC | Financial Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,798 [9],[14] 0 [11],[15]  
Investment, Identifier [Axis]: Carr, Riggs & Ingram Capital, LLC | Financial Services 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 11,591 [8],[9],[12] 11,620 [10],[11],[13]  
Investment, Identifier [Axis]: Center Phase Energy, LLC | Electric Utilities 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 10,305 [8],[9] 10,305 [10],[11]  
Investment, Identifier [Axis]: Center Phase Energy, LLC | Electric Utilities 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 15,147 [8],[9] 15,186 [10],[11]  
Investment, Identifier [Axis]: Center Phase Energy, LLC | Electric Utilities 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,386 [9],[17],[21] 2,386 [7],[11],[22]  
Investment, Identifier [Axis]: Center Phase Energy, LLC | Electric Utilities 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 636 [9],[17],[21] 636 [7],[11],[22]  
Investment, Identifier [Axis]: Charter Industries Holdings, LLC | Distributors 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (33) [9],[14] (34) [11],[15]  
Investment, Identifier [Axis]: Charter Industries Holdings, LLC | Distributors 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (49) [9],[14] (51) [11],[15]  
Investment, Identifier [Axis]: Charter Industries Holdings, LLC | Distributors 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 28,983 [8],[9] 29,807 [10],[11]  
Investment, Identifier [Axis]: Cirque Du Soleil Holding USA Newco, Inc. | Entertainment      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [16],[17],[25] 16,611    
Investment, Identifier [Axis]: Cirque Du Soleil Holding USA Newco, Inc. | Entertainment      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[19],[24],[26]   14,632  
Investment, Identifier [Axis]: Cirque Du Soleil Holding USA Newco, Inc., Entertainment      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,894 6,756  
Investment, Identifier [Axis]: Cirque Du Soleil Holding USA Newco, Inc., Equity/Other Investments      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 14,632 0
Investment, Identifier [Axis]: Citadel Securities, LP, Financial Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,402 4,432  
Investment, Identifier [Axis]: Clarios Global, LP, Automobile Components      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 9,915 10,012  
Investment, Identifier [Axis]: Cliffwater, LLC | Capital Markets 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[14] 0    
Investment, Identifier [Axis]: Cliffwater, LLC | Capital Markets 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[9],[12] 30,078    
Investment, Identifier [Axis]: Cliffwater, LLC | Financial Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[15]   0  
Investment, Identifier [Axis]: Cliffwater, LLC | Financial Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11],[13]   30,154  
Investment, Identifier [Axis]: Clover Holding 2, LLC, Software      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,983 5,219  
Investment, Identifier [Axis]: Coalesce Merlin Purchaser, LLC | Commercial Services & Supplies 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,450 [9],[14] 715 [11],[15]  
Investment, Identifier [Axis]: Coalesce Merlin Purchaser, LLC | Commercial Services & Supplies 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (32) [9],[14] (32) [11],[15]  
Investment, Identifier [Axis]: Coalesce Merlin Purchaser, LLC | Commercial Services & Supplies 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 17,256 [8],[9],[12] 17,300 [10],[11],[13]  
Investment, Identifier [Axis]: Cold Spring Brewing, Co. | Beverages      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 20,556 [8],[9],[12] 20,556 [10],[11],[13]  
Investment, Identifier [Axis]: Communication Technology Intermediate, LLC | Professional Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[9] 24,607    
Investment, Identifier [Axis]: Communication Technology Intermediate, LLC | Professional Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,412 [9],[14] 1,188 [11],[15]  
Investment, Identifier [Axis]: Communication Technology Intermediate, LLC | Professional Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   24,672  
Investment, Identifier [Axis]: Communication Technology Intermediate, LLC | Professional Services 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 24,295 [8],[9] 24,357 [10],[11]  
Investment, Identifier [Axis]: Communication Technology Intermediate, LLC | Professional Services 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,414 [8],[9] 2,420 [10],[11]  
Investment, Identifier [Axis]: Communication Technology Intermediate, LLC | Professional Services 5      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 8,560 [8],[9],[12] 8,582 [10],[11],[13]  
Investment, Identifier [Axis]: Compass Power Generation, LLC, Independent Power and Renewable Electricity Producers      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,228 6,467  
Investment, Identifier [Axis]: Connectwise, LL, Software      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,173    
Investment, Identifier [Axis]: Connectwise, LLC, Software      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   10,427  
Investment, Identifier [Axis]: Conservice Midco, LLC, Diversified Consumer Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   5,423  
Investment, Identifier [Axis]: Consolidated Precision Products Corp. | Aerospace & Defense      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 20,812 [9],[21] 21,867 [11],[22]  
Investment, Identifier [Axis]: Corelogic, Inc. | Capital Markets      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8] 8,617    
Investment, Identifier [Axis]: Corelogic, Inc. | IT Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10]   9,326  
Investment, Identifier [Axis]: Corelogic, Inc., Capital Markets      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 8,455    
Investment, Identifier [Axis]: Corelogic, Inc., IT Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   8,879  
Investment, Identifier [Axis]: Corfin Industries, LLC | Aerospace & Defense 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9] 1,545    
Investment, Identifier [Axis]: Corfin Industries, LLC | Aerospace & Defense 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9] 9,411    
Investment, Identifier [Axis]: Corfin Industries, LLC | Aerospace & Defense 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[9],[12] 15,807    
Investment, Identifier [Axis]: Corfin Industries, LLC | Aerospace & Defense 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[9],[12] 19,533    
Investment, Identifier [Axis]: Corfin Industries, LLC | Electrical Equipment 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11]   1,549  
Investment, Identifier [Axis]: Corfin Industries, LLC | Electrical Equipment 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11]   9,435  
Investment, Identifier [Axis]: Corfin Industries, LLC | Electrical Equipment 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11],[13]   15,849  
Investment, Identifier [Axis]: Corfin Industries, LLC | Electrical Equipment 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11],[13]   19,582  
Investment, Identifier [Axis]: Cornerstone Building Brands, Inc., Building Products      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   2,798  
Investment, Identifier [Axis]: Cornerstone Chemical, Co. | Chemicals      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[16],[17] 3,107    
Investment, Identifier [Axis]: Cornerstone Chemical, Co. | Chemicals      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[11],[19]   3,107  
Investment, Identifier [Axis]: Coronis Health I, LLC | Health Care Technology 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 798 [9],[14],[23] 532 [11],[15],[24]  
Investment, Identifier [Axis]: Coronis Health I, LLC | Health Care Technology 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,342 [9],[23] 4,225 [11],[24]  
Investment, Identifier [Axis]: Coronis Health I, LLC | Health Care Technology 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,785 [9],[23] 2,751 [11],[24]  
Investment, Identifier [Axis]: Coronis Health I, LLC | Health Care Technology 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,900 [9],[16],[17],[23] 4,900 [7],[11],[19],[24]  
Investment, Identifier [Axis]: Coronis Health I, LLC, Equity/Other Investments      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,900 4,900 0
Investment, Identifier [Axis]: Coronis Health I, LLC, Senior Secured First Lien Debt 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 798 532 0
Investment, Identifier [Axis]: Coronis Health I, LLC, Senior Secured First Lien Debt 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,342 4,225 0
Investment, Identifier [Axis]: Coronis Health I, LLC, Senior Secured Second Lien Debt      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,785 2,751 0
Investment, Identifier [Axis]: Cotiviti, Inc., Health Care Providers & Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,330 4,528  
Investment, Identifier [Axis]: Cotiviti, Inc., Health Care Providers & Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 9,011 9,424  
Investment, Identifier [Axis]: Crisis Prevention Institute, Inc., Diversified Consumer Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,275 2,290  
Investment, Identifier [Axis]: Crown Finance US, Inc., Entertainment      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,881 4,873  
Investment, Identifier [Axis]: Danish CRJ, Ltd. (2) (4), Equity/Other Investments      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   0 0
Investment, Identifier [Axis]: Demakes Borrower, LLC | Consumer Staples Distribution & Retail      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 17,532 [8],[9] 17,577 [10],[11]  
Investment, Identifier [Axis]: Directv Financing, LLC, Media      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   196  
Investment, Identifier [Axis]: EIG Management Co., LLC, Capital Markets      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,442 3,442  
Investment, Identifier [Axis]: EMRLD Borrower, LP, Machinery      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,863    
Investment, Identifier [Axis]: Eaton Vance CDO, Ltd. 15-1A FR, Capital Markets      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 381 846  
Investment, Identifier [Axis]: Edelman Financial Center, LLC | Capital Markets      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 9,391 [8] 9,468 [10]  
Investment, Identifier [Axis]: Edelman Financial Center, LLC, Capital Markets      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   4,734  
Investment, Identifier [Axis]: Edelman Financial Center, LLC, Capital Markets, S+ 5.25% (8.92%)      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,695    
Investment, Identifier [Axis]: Einstein Parent, Inc. | Software 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (69) [9],[14] (12) [11],[15]  
Investment, Identifier [Axis]: Einstein Parent, Inc. | Software 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 21,648 [8],[9],[12] 22,206 [10],[11],[13]  
Investment, Identifier [Axis]: Electric Power Engineers, LLC | Construction & Engineering 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[14] 6,379    
Investment, Identifier [Axis]: Electric Power Engineers, LLC | Construction & Engineering 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[14] 2,127    
Investment, Identifier [Axis]: Electric Power Engineers, LLC | Construction & Engineering 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[9],[12] 27,909    
Investment, Identifier [Axis]: Electric Power Engineers, LLC | Professional Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[15]   0  
Investment, Identifier [Axis]: Electric Power Engineers, LLC | Professional Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[15]   0  
Investment, Identifier [Axis]: Electric Power Engineers, LLC | Professional Services 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11],[13]   27,909  
Investment, Identifier [Axis]: Electro-Methods, LP | Aerospace & Defense 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[14] 0    
Investment, Identifier [Axis]: Electro-Methods, LP | Aerospace & Defense 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[9],[12] 34,326    
Investment, Identifier [Axis]: Electro-Methods, LP | Machinery 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[15]   0  
Investment, Identifier [Axis]: Electro-Methods, LP | Machinery 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11],[13]   34,412  
Investment, Identifier [Axis]: Eliassen Group, LLC | Professional Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,340 [8],[9] 1,344 [10],[11]  
Investment, Identifier [Axis]: Eliassen Group, LLC | Professional Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 16,759 [8],[9],[12] 16,802 [10],[11],[13]  
Investment, Identifier [Axis]: Emerald Borrower, LP, Machinery      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,282 2,297  
Investment, Identifier [Axis]: Ensemble RCM, LLC, Health Care Providers & Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 12,835 13,368  
Investment, Identifier [Axis]: Entain, PLC, Hotels, Restaurants & Leisure 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,767 4,747  
Investment, Identifier [Axis]: Entain, PLC, Hotels, Restaurants & Leisure 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,446 3,435  
Investment, Identifier [Axis]: Epicor Software Corp., Software      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,932 6,086  
Investment, Identifier [Axis]: FBLC Senior Loan Fund, LLC | Investment in Joint Ventures      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 222,706 [9],[17],[18],[27] 224,956 [7],[11],[20],[28]  
Investment, Identifier [Axis]: FBLC Senior Loan Fund, LLC, Joint Venture      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 222,706 224,956 404,934
Investment, Identifier [Axis]: FGT Purchaser, LLC | Internet & Direct Marketing Retail 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[14] (296)    
Investment, Identifier [Axis]: FGT Purchaser, LLC | Internet & Direct Marketing Retail 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[9] 28,304    
Investment, Identifier [Axis]: FGT Purchaser, LLC | Specialty Retail 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[15]   (296)  
Investment, Identifier [Axis]: FGT Purchaser, LLC | Specialty Retail 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   28,164  
Investment, Identifier [Axis]: FNZ Group Entities, Ltd., Financial Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,330 2,330  
Investment, Identifier [Axis]: Faraday Buyer, LLC | Electrical Equipment 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   40,805  
Investment, Identifier [Axis]: Faraday Buyer, LLC | Electrical Equipment 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   8,644  
Investment, Identifier [Axis]: FinThrive Software Intermediate Holdings, Inc., Health Care Technology      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,419 2,732  
Investment, Identifier [Axis]: First Eagle Greenway Fund II, LLC, Equity/Other Investments      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   0 255
Investment, Identifier [Axis]: Fitness International, LLC, Hotels, Restaurants & Leisure      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,824 6,839  
Investment, Identifier [Axis]: FloWorks International, LLC | Machinery 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11]   4,958  
Investment, Identifier [Axis]: FloWorks International, LLC | Machinery 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11],[13]   39,366  
Investment, Identifier [Axis]: FloWorks International, LLC | Trading Companies & Distributors 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9] 4,958    
Investment, Identifier [Axis]: FloWorks International, LLC | Trading Companies & Distributors 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[9],[12] 39,267    
Investment, Identifier [Axis]: Florida Food Products, LLC | Food Products 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 7,321 [8] 7,555 [10]  
Investment, Identifier [Axis]: Florida Food Products, LLC | Food Products 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,975 [8],[9] 1,916 [10],[11]  
Investment, Identifier [Axis]: Florida Food Products, LLC | Food Products 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,877 [8] 1,890 [10]  
Investment, Identifier [Axis]: Flow Traders Holding, LLC | Capital Markets 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 16,357 [9],[25] (91) [11],[15],[26]  
Investment, Identifier [Axis]: Flow Traders Holding, LLC | Capital Markets 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (88) [9],[14],[25] 16,389 [11],[26]  
Investment, Identifier [Axis]: Focus Financial Partners, LLC, Capital Markets      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,276 4,443  
Investment, Identifier [Axis]: Foresight Energy Operating, LL, Oil, Gas & Consumable Fuels      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 646    
Investment, Identifier [Axis]: Foresight Energy Operating, LLC | Oil, Gas & Consumable Fuels 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,034 [9] 1,037 [11]  
Investment, Identifier [Axis]: Foresight Energy Operating, LLC | Oil, Gas & Consumable Fuels 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 876 [9],[16],[17],[21] 876 [7],[11],[19],[22]  
Investment, Identifier [Axis]: Foresight Energy Operating, LLC, Oil, Gas & Consumable Fuels      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   648  
Investment, Identifier [Axis]: Freeport LNG Investments, LLLP, Oil, Gas & Consumable Fuels      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,996 4,820  
Investment, Identifier [Axis]: Gainwell Acquisition Corp., Health Care Technology      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,900    
Investment, Identifier [Axis]: Galaxy US OpCo, Inc., Professional Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   2,229  
Investment, Identifier [Axis]: Galway Borrower, LLC | Insurance 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,125 [9] 920 [11],[15]  
Investment, Identifier [Axis]: Galway Borrower, LLC | Insurance 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,264 [9],[14] 581 [11],[15]  
Investment, Identifier [Axis]: Galway Borrower, LLC | Insurance 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (17) [9],[14] 38,101 [10],[11]  
Investment, Identifier [Axis]: Galway Borrower, LLC | Insurance 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[9] 38,006    
Investment, Identifier [Axis]: Geon Performance Solutions, LLC, Chemicals      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,970 3,555  
Investment, Identifier [Axis]: Geosyntec Consultants, Inc., Professional Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 9,118 9,227  
Investment, Identifier [Axis]: Global Medical Response, Inc., Health Care Providers & Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 9,898 10,022  
Investment, Identifier [Axis]: GoHealth, Inc. | Insurance      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5 [16],[21] 7 [19],[22]  
Investment, Identifier [Axis]: Golden State Foods, LLC, Food Products      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,419 6,450  
Investment, Identifier [Axis]: Gordian Medical, Inc. | Health Care Providers & Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [8],[9],[16],[17] 0 [7],[11],[19]  
Investment, Identifier [Axis]: Gordian Medical, Inc. | Health Care Providers & Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,944 [8],[9],[16],[17] 2,944 [7],[10],[11]  
Investment, Identifier [Axis]: Gordian Medical, Inc., Health Care Providers & Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 7,316 7,316  
Investment, Identifier [Axis]: Gordian Medical, Inc., Health Care Providers & Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 0  
Investment, Identifier [Axis]: Greywolf CLO, Ltd. 20-3RA ER, Capital Markets      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 803 916  
Investment, Identifier [Axis]: Groome Purchaser, LLC | Commercial Services & Supplies 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (32) [9],[14] (33) [11],[15]  
Investment, Identifier [Axis]: Groome Purchaser, LLC | Commercial Services & Supplies 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (47) [9],[14] (49) [11],[15]  
Investment, Identifier [Axis]: Groome Purchaser, LLC | Commercial Services & Supplies 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (24) [9],[14] (25) [11],[15]  
Investment, Identifier [Axis]: Groome Purchaser, LLC | Commercial Services & Supplies 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 16,333 [8],[9] 16,368 [10],[11]  
Investment, Identifier [Axis]: Gulfside Supply, Inc., Building Products      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,016 4,375  
Investment, Identifier [Axis]: Hamilton Projects Acquiror, LLC, Independent Power and Renewable Electricity Producers      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,442 6,617  
Investment, Identifier [Axis]: HelpSystems Holdings, Inc., Software      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,647 4,139  
Investment, Identifier [Axis]: Higginbotham Insurance Agency, Inc. | Insurance      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 10,046 [9],[17] 10,046 [7],[11]  
Investment, Identifier [Axis]: High Street Buyer, Inc. | Insurance      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,023 [9],[14] 3,259 [11],[15]  
Investment, Identifier [Axis]: Highbridge Loan Management, Ltd. 11A-17 E, Capital Markets      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,200 2,592  
Investment, Identifier [Axis]: Hologic, Inc. | Health Care Equipment & Supplies      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 7,004    
Investment, Identifier [Axis]: Hologic, Inc., Health Care Equipment & Supplies      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 9,875    
Investment, Identifier [Axis]: Hometown Food, Co. | Food Products      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 15,013 [8],[9],[12] 14,973 [10],[11],[13]  
Investment, Identifier [Axis]: Hospice Care Buyer, Inc. | Health Care Providers & Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,604 [9] 4,615 [11]  
Investment, Identifier [Axis]: Hospice Care Buyer, Inc. | Health Care Providers & Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,127 [9] 2,085 [11],[15]  
Investment, Identifier [Axis]: Hospice Care Buyer, Inc. | Health Care Providers & Services 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,680 [9],[14] 2,132 [11]  
Investment, Identifier [Axis]: Hospice Care Buyer, Inc. | Health Care Providers & Services 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 24,766 [8],[9] 24,828 [10],[11]  
Investment, Identifier [Axis]: Hospice Care Buyer, Inc. | Health Care Providers & Services 5      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,428 [8],[9] 6,444 [10],[11]  
Investment, Identifier [Axis]: Hospice Care Buyer, Inc. | Health Care Providers & Services 6      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 8,380 [8],[9] 8,401 [10],[11]  
Investment, Identifier [Axis]: Hospice Care Buyer, Inc. | Health Care Providers & Services 7      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,519 [8],[9] 3,528 [10],[11]  
Investment, Identifier [Axis]: Hudson River Trading, LLC, Capital Markets      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,184 5,243  
Investment, Identifier [Axis]: Hunter Communications & Technologies, LLC | Diversified Telecommunication Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[14] 409    
Investment, Identifier [Axis]: Hunter Communications | Diversified Telecommunication Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[14] (6)    
Investment, Identifier [Axis]: Hunter Communications | Diversified Telecommunication Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[9] 5,754    
Investment, Identifier [Axis]: Hunter Douglas, Inc., Household Durables      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,446 4,500  
Investment, Identifier [Axis]: ICAT Intermediate Holdings, LLC | Air Freight & Logistics 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[14] 4,052    
Investment, Identifier [Axis]: ICAT Intermediate Holdings, LLC | Air Freight & Logistics 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[14] (17)    
Investment, Identifier [Axis]: ICAT Intermediate Holdings, LLC | Air Freight & Logistics 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[9] 17,042    
Investment, Identifier [Axis]: ICAT Intermediate Holdings, LLC | Ground Transportation 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[15]   2,050  
Investment, Identifier [Axis]: ICAT Intermediate Holdings, LLC | Ground Transportation 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[15]   (18)  
Investment, Identifier [Axis]: ICAT Intermediate Holdings, LLC | Ground Transportation 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   17,066  
Investment, Identifier [Axis]: ICR Operations, LLC | Professional Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[15]   3,784  
Investment, Identifier [Axis]: ICR Operations, LLC | Professional Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   40,839  
Investment, Identifier [Axis]: ICR Operations, LLC | Professional Services 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   2,219  
Investment, Identifier [Axis]: IDERA, Inc., Software      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,883    
Investment, Identifier [Axis]: IDERA, Inc., Software 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   4,602  
Investment, Identifier [Axis]: IDERA, Inc., Software 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   933  
Investment, Identifier [Axis]: IDERA, Inc., Software, S+ 6.75% (10.56%)      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 716    
Investment, Identifier [Axis]: IG Investments Holdings, LLC | Professional Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [9],[14] 0 [11],[15]  
Investment, Identifier [Axis]: IG Investments Holdings, LLC | Professional Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 25,935 [8],[9] 26,001 [10],[11]  
Investment, Identifier [Axis]: ION Platform Finance US, Inc., Software      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,709 3,803  
Investment, Identifier [Axis]: IQN Holding Corp. | Software 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,748 [9] 5,790 [11]  
Investment, Identifier [Axis]: IQN Holding Corp. | Software 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 864 [9],[14] 988 [11],[15]  
Investment, Identifier [Axis]: IQN Holding Corp. | Software 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 17,159 [8],[9],[12] 17,329 [10],[11],[13]  
Investment, Identifier [Axis]: Icon Parent I, Inc., Software      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,753 4,981  
Investment, Identifier [Axis]: Ideal Tridon Holdings, Inc. | Machinery 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (69) [9],[14] (72) [11],[15]  
Investment, Identifier [Axis]: Ideal Tridon Holdings, Inc. | Machinery 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 807 [9],[14] 804 [11],[15]  
Investment, Identifier [Axis]: Ideal Tridon Holdings, Inc. | Machinery 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 41,788 [8],[9],[12] 41,876 [10],[11],[13]  
Investment, Identifier [Axis]: Indicor, LLC, Industrial Conglomerates      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,942    
Investment, Identifier [Axis]: Indigo Buyer, Inc. | Containers & Packaging 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 9,788 [9],[14] 4,007 [11],[15]  
Investment, Identifier [Axis]: Indigo Buyer, Inc. | Containers & Packaging 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [9],[14] 0 [11],[15]  
Investment, Identifier [Axis]: Indigo Buyer, Inc. | Containers & Packaging 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 60,725 [8],[9] 60,879 [10],[11]  
Investment, Identifier [Axis]: InhabitIQ, Inc. | Software 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (109) [9],[14] (31) [11],[15]  
Investment, Identifier [Axis]: InhabitIQ, Inc. | Software 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (68) [9],[14] (20) [11],[15]  
Investment, Identifier [Axis]: InhabitIQ, Inc. | Software 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 25,555 [8],[9],[12] 25,897 [10],[11],[13]  
Investment, Identifier [Axis]: Integrated Efficiency Solutions, Inc, Equity/Other Investments 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   0 0
Investment, Identifier [Axis]: Integrated Efficiency Solutions, Inc. Electrical Equipment      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[16],[17],[21],[23] 0    
Investment, Identifier [Axis]: Integrated Efficiency Solutions, Inc. | Electrical Equipment 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[24]   1,378  
Investment, Identifier [Axis]: Integrated Efficiency Solutions, Inc. | Electrical Equipment 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[24],[29]   668  
Investment, Identifier [Axis]: Integrated Efficiency Solutions, Inc. | Electrical Equipment 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[11],[19],[22]   0  
Investment, Identifier [Axis]: Integrated Efficiency Solutions, Inc. | Electrical Equipment 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[11],[19],[22]   0  
Investment, Identifier [Axis]: Integrated Efficiency Solutions, Inc., Equity/Other Investments      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 0  
Investment, Identifier [Axis]: Integrated Efficiency Solutions, Inc., Equity/Other Investments 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   0 0
Investment, Identifier [Axis]: Integrated Efficiency Solutions, Inc., Senior Secured First Lien Debt      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 1,378  
Investment, Identifier [Axis]: Integrated Efficiency Solutions, Inc., Senior Secured First Lien Debt 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   1,378 1,393
Investment, Identifier [Axis]: Integrated Efficiency Solutions, Inc., Senior Secured First Lien Debt 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   0 210
Investment, Identifier [Axis]: Integrated Efficiency Solutions, Inc., Senior Secured First Lien Debt 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   0 0
Investment, Identifier [Axis]: Integrated Efficiency Solutions, Inc., Senior Secured Second Lien Debt      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 668 446
Investment, Identifier [Axis]: Integrated Global Services, Inc. | Commercial Services & Supplies 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[15]   (72)  
Investment, Identifier [Axis]: Integrated Global Services, Inc. | Commercial Services & Supplies 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[15]   1,560  
Investment, Identifier [Axis]: Integrated Global Services, Inc. | Commercial Services & Supplies 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11],[13]   32,151  
Investment, Identifier [Axis]: Integrated Global Services, Inc. | Construction & Engineering 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[14] (69)    
Investment, Identifier [Axis]: Integrated Global Services, Inc. | Construction & Engineering 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[14] 4,093    
Investment, Identifier [Axis]: Integrated Global Services, Inc. | Construction & Engineering 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[9],[12] 32,086    
Investment, Identifier [Axis]: International Cruise & Excursion Gallery, Inc. | Hotels, Restaurants & Leisure 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[12] 1,358    
Investment, Identifier [Axis]: International Cruise & Excursion Gallery, Inc. | Hotels, Restaurants & Leisure 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [9],[12],[16],[17] 0 [7],[11],[13],[19],[22]  
Investment, Identifier [Axis]: International Cruise & Excursion Gallery, Inc. | Hotels, Restaurants & Leisure A      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[13]   1,358  
Investment, Identifier [Axis]: Invenergy Thermal Operating I, LLC, Independent Power and Renewable Electricity Producers      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   3,578  
Investment, Identifier [Axis]: Invenergy Thermal Operating I, LLC, Independent Power and Renewable Electricity Producers 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,463    
Investment, Identifier [Axis]: Invenergy Thermal Operating I, LLC, Independent Power and Renewable Electricity Producers 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 225 226  
Investment, Identifier [Axis]: Jane Street Group, LLC, Financial Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 7,906 8,040  
Investment, Identifier [Axis]: Jump Financial, LLC, Financial Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 7,205 7,124  
Investment, Identifier [Axis]: KKR Financial CLO, Ltd. 15 FR, Capital Markets      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,507 1,795  
Investment, Identifier [Axis]: Kahala Aviation, LLC | Asset Based Financing      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[20]   33,911  
Investment, Identifier [Axis]: Kahala Aviation, LLC | Asset Based Financing      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[11],[19],[20]   10,330  
Investment, Identifier [Axis]: Kahala Aviation, LLC | Asset Based Financing 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[18] 47,542    
Investment, Identifier [Axis]: Kahala Aviation, LLC | Asset Based Financing 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[16],[17],[18] 12,473    
Investment, Identifier [Axis]: Kahala Aviation, LLC, Equity/Other Investments      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 12,473 10,330 2,308
Investment, Identifier [Axis]: Kahala Aviation, LLC, Subordinated Debt      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 47,542 33,911 0
Investment, Identifier [Axis]: Kahala Ireland Opco DAC, Subordinated Debt      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   0 0
Investment, Identifier [Axis]: Kahala US OpCo, LLC, Equity/Other Investments      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   0 0
Investment, Identifier [Axis]: Kaman Corp., Aerospace & Defense 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 58  
Investment, Identifier [Axis]: Kaman Corp., Aerospace & Defense 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,297 6,220  
Investment, Identifier [Axis]: Kaseya, Inc., Software      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,503 3,772  
Investment, Identifier [Axis]: Kingpin Intermediate Holdings, LLC, Hotels, Restaurants & Leisure 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,417 4,733  
Investment, Identifier [Axis]: Kingpin Intermediate Holdings, LLC, Hotels, Restaurants & Leisure 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,795 7,331  
Investment, Identifier [Axis]: Knowledge Pro Buyer, Inc. | Professional Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 22,894 [9],[14] 21,622 [11],[15]  
Investment, Identifier [Axis]: Knowledge Pro Buyer, Inc. | Professional Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,976 [9],[14] 0 [11],[15]  
Investment, Identifier [Axis]: Knowledge Pro Buyer, Inc. | Professional Services 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 41,975 [8],[9],[12] 42,173 [10],[11],[13]  
Investment, Identifier [Axis]: Kodiak Building Partners, LLC, Building Products      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,998 3,896  
Investment, Identifier [Axis]: LABL, Inc., Containers & Packaging      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,226 3,093  
Investment, Identifier [Axis]: LBM Acquisition, LLC, Building Products      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,591    
Investment, Identifier [Axis]: LCM, Ltd. Partnership 16A ER2, Capital Markets      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,635 1,807  
Investment, Identifier [Axis]: LSF12 Donnelly Bidco, LLC | Machinery      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 18,691 [8],[9] 18,739 [10],[11]  
Investment, Identifier [Axis]: Labrie Environmental Group, LLC | Machinery      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[26]   21,666  
Investment, Identifier [Axis]: Lakeland Tours, LLC | Diversified Consumer Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[12],[30] 1,981    
Investment, Identifier [Axis]: Lakeland Tours, LLC | Diversified Consumer Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11],[13],[29]   45  
Investment, Identifier [Axis]: Lakeland Tours, LLC | Diversified Consumer Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [9],[12],[16],[17] 1,414 [11],[13],[29]  
Investment, Identifier [Axis]: LaserShip, Inc. | Air Freight & Logistics      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 742    
Investment, Identifier [Axis]: LaserShip, Inc. | Ground Transportation      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   838  
Investment, Identifier [Axis]: Last Dance Intermediate II, LLC | Diversified Telecommunication Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [9],[14] 3,987 [11],[15]  
Investment, Identifier [Axis]: Last Dance Intermediate II, LLC | Diversified Telecommunication Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 15,250 [9],[14] (44) [11],[15]  
Investment, Identifier [Axis]: Last Dance Intermediate II, LLC | Diversified Telecommunication Services 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [9],[14] 18,884 [10],[11],[13]  
Investment, Identifier [Axis]: Last Dance Intermediate II, LLC | Diversified Telecommunication Services 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 19,054 [8],[9],[12] 19,059 [10],[11],[13]  
Investment, Identifier [Axis]: Last Dance Intermediate II, LLC | Diversified Telecommunication Services 5      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[9],[12] 19,312    
Investment, Identifier [Axis]: Lighthouse Intelligence, Ltd. | Software 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 22,093 [9],[25] (154) [11],[15],[26]  
Investment, Identifier [Axis]: Lighthouse Intelligence, Ltd. | Software 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (345) [9],[14],[25] (110) [11],[15],[26]  
Investment, Identifier [Axis]: Lighthouse Intelligence, Ltd. | Software 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (246) [9],[14],[25] 22,370 [11],[26]  
Investment, Identifier [Axis]: MGTF Holdco, LLC | Media      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[11],[19],[20],[22]   0  
Investment, Identifier [Axis]: MGTF Holdco, LLC, Equity/Other Investments      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   0 0
Investment, Identifier [Axis]: MGTF Radio Company, LLC | Media      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[20],[29]   11,408  
Investment, Identifier [Axis]: MGTF Radio Company, LLC, Senior Secured First Lien Debt      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 11,408 31,672
Investment, Identifier [Axis]: MH Sub I, LLC, IT Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,589 4,978  
Investment, Identifier [Axis]: MRI Software, LLC | Software 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,153 [9] 52 [11],[15]  
Investment, Identifier [Axis]: MRI Software, LLC | Software 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,650 [9] 11 [11],[15]  
Investment, Identifier [Axis]: MRI Software, LLC | Software 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 162 [9],[14] 2,180 [11]  
Investment, Identifier [Axis]: MRI Software, LLC | Software 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 14 [9],[14] 6,734 [11]  
Investment, Identifier [Axis]: MWH Intermediate II, LLC | Capital Markets 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9] 8,965    
Investment, Identifier [Axis]: MWH Intermediate II, LLC | Capital Markets 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[14] 929    
Investment, Identifier [Axis]: MWH Intermediate II, LLC | Capital Markets 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[9] 15,249    
Investment, Identifier [Axis]: MWH Intermediate II, LLC | Financial Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[15]   1,941  
Investment, Identifier [Axis]: MWH Intermediate II, LLC | Financial Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[15]   (13)  
Investment, Identifier [Axis]: MWH Intermediate II, LLC | Financial Services 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   15,284  
Investment, Identifier [Axis]: Mandrake Bidco, Inc. | Machinery 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [9],[14] 0 [11],[15]  
Investment, Identifier [Axis]: Mandrake Bidco, Inc. | Machinery 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 55,557 [8],[9],[12] 55,557 [10],[11],[13]  
Investment, Identifier [Axis]: Manna Pro Products, LLC | Food Products 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9] 3,373    
Investment, Identifier [Axis]: Manna Pro Products, LLC | Food Products 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[14] (430)    
Investment, Identifier [Axis]: Manna Pro Products, LLC | Food Products 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[12] 1,608    
Investment, Identifier [Axis]: Manna Pro Products, LLC | Food Products 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[12] 5,783    
Investment, Identifier [Axis]: Manna Pro Products, LLC | Food Products 5      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[12] 20,396    
Investment, Identifier [Axis]: Manna Pro Products, LLC | Specialty Retail 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11]   3,341  
Investment, Identifier [Axis]: Manna Pro Products, LLC | Specialty Retail 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[15]   (430)  
Investment, Identifier [Axis]: Manna Pro Products, LLC | Specialty Retail 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11]   1,593  
Investment, Identifier [Axis]: Manna Pro Products, LLC | Specialty Retail 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11]   5,729  
Investment, Identifier [Axis]: Manna Pro Products, LLC | Specialty Retail 5      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11]   20,204  
Investment, Identifier [Axis]: Max US Bidco, Inc., Food Products      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,007 3,755  
Investment, Identifier [Axis]: McDonald Worley, P.C. | Professional Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,845 [9],[14],[30] 6,513 [11],[15],[29]  
Investment, Identifier [Axis]: McDonald Worley, P.C. | Professional Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 10,828 [9],[16],[17] 10,264 [7],[11],[19]  
Investment, Identifier [Axis]: Medical Management Resource Group, LLC | Health Care Providers & Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (28) [9],[14] 744 [11],[15]  
Investment, Identifier [Axis]: Medical Management Resource Group, LLC | Health Care Providers & Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 9,160 [8],[9] 9,184 [10],[11]  
Investment, Identifier [Axis]: Medical Management Resource Group, LLC | Health Care Providers & Services 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 22,175 [8],[9] 22,233 [10],[11]  
Investment, Identifier [Axis]: Megavolt Borrower, LLC | Construction & Engineering      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 36,896 [8],[9],[12] 36,989 [10],[11],[13]  
Investment, Identifier [Axis]: Merlin Buyer, Inc., Machinery      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   1,118  
Investment, Identifier [Axis]: Merlin Buyer, Inc., Machinery 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,500    
Investment, Identifier [Axis]: Merlin Buyer, Inc., Machinery 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,105    
Investment, Identifier [Axis]: Mermaid Bidco Inc, IT Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   7,481  
Investment, Identifier [Axis]: Mermaid Bidco, Inc. , IT Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 7,276    
Investment, Identifier [Axis]: Michael Baker International, LLC | Construction & Engineering      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9] 17,155    
Investment, Identifier [Axis]: Michael Baker International, LLC | Professional Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11]   18,223  
Investment, Identifier [Axis]: Midwest Can Company, LLC | Containers & Packaging      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 27,902 [8],[9],[12] 27,902 [10],[11],[13]  
Investment, Identifier [Axis]: Mirra-Primeaccess Holdings, LLC | Health Care Providers & Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 61,120 [9] 7,316 [11],[15]  
Investment, Identifier [Axis]: Mirra-Primeaccess Holdings, LLC | Health Care Providers & Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 7,316 [9],[14] 61,279 [11]  
Investment, Identifier [Axis]: Monogram Food Solutions, LLC, Food Products      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,082 2,088  
Investment, Identifier [Axis]: Motor Vehicle Software Corp. | Software      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,077 [9],[16],[17],[31] 1,077 [7],[11],[19],[32]  
Investment, Identifier [Axis]: Multi-Color Corp., Containers & Packaging      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 276    
Investment, Identifier [Axis]: Muth Mirror Systems, LLC | Automobile Components 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[11],[19],[22]   0  
Investment, Identifier [Axis]: Muth Mirror Systems, LLC | Automobile Components 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6 [9],[14],[30] 396 [11],[15],[29]  
Investment, Identifier [Axis]: Muth Mirror Systems, LLC | Automobile Components 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,626 [9],[30] 7,624 [11],[29]  
Investment, Identifier [Axis]: Muth Mirror Systems, LLC | Automobile Components 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [9],[16],[17],[21] 0 [7],[11],[19],[22]  
Investment, Identifier [Axis]: Muth Mirror Systems, LLC | Automobile Components 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[16],[17],[21] 0    
Investment, Identifier [Axis]: Neptune Bidco US, Inc., Interactive Media & Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   579  
Investment, Identifier [Axis]: NewStar Arlington Senior Loan Program, LLC 14-1A FR | Capital Markets      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,553 [9],[17],[23],[25] 4,322 [7],[11],[24],[26]  
Investment, Identifier [Axis]: NewStar Arlington Senior Loan Program, LLC 14-1A FR, Collateralized Securities      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,553 4,322 4,237
Investment, Identifier [Axis]: NewStar Arlington Senior Loan Program, LLC 14-1A SUB | Capital Markets      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [9],[17],[23],[25],[33] 0 [7],[11],[24],[26],[34]  
Investment, Identifier [Axis]: NewStar Arlington Senior Loan Program, LLC 14-1A SUB, Collateralized Securities      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 0 2,170
Investment, Identifier [Axis]: Newstar Fairfield Fund CLO, Ltd. 2015-1RA F, Collateralized Securities      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   0 2,457
Investment, Identifier [Axis]: Newstar Fairfield Fund CLO, Ltd. 2015-1RA SUB | Capital Markets      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 476 [9],[17],[23],[25],[33] 477 [7],[11],[24],[26],[34]  
Investment, Identifier [Axis]: Newstar Fairfield Fund CLO, Ltd. 2015-1RA SUB, Collateralized Securities      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 476 477 1,208
Investment, Identifier [Axis]: Nexus Buyer, LLC , Capital Markets      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,750    
Investment, Identifier [Axis]: Nexus Buyer, LLC, Capital Markets      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   4,889  
Investment, Identifier [Axis]: Norvax, LLC | Insurance 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 228 [9] 354 [11]  
Investment, Identifier [Axis]: Norvax, LLC | Insurance 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 360 [9] 228 [11]  
Investment, Identifier [Axis]: Nouryon Finance B.V., Chemicals      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,151 2,202  
Investment, Identifier [Axis]: ORG GC Holdings, LLC | Professional Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[11],[19],[22],[24]   0  
Investment, Identifier [Axis]: ORG GC Holdings, LLC | Professional Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 10,111 [9],[23] 10,111 [11],[24]  
Investment, Identifier [Axis]: ORG GC Holdings, LLC | Professional Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,570 [9],[23],[30] 2,810 [11],[24],[29]  
Investment, Identifier [Axis]: ORG GC Holdings, LLC | Professional Services 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [9],[16],[17],[21],[23] 0 [7],[11],[19],[22],[24]  
Investment, Identifier [Axis]: ORG GC Holdings, LLC | Professional Services 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[16],[17],[21],[23] 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, Equity/Other Investments 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   0 0
Investment, Identifier [Axis]: ORG GC Holdings, LLC, Senior Secured First Lien Debt      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 10,111 10,111 10,112
Investment, Identifier [Axis]: ORG GC Holdings, LLC, Senior Secured Second Lien Debt      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,570 2,810 4,999
Investment, Identifier [Axis]: OSV Thunderbold Topco, Inc. | Professional Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9] 4,548    
Investment, Identifier [Axis]: OSV Thunderbold Topco, Inc. | Professional Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[16],[17] 0    
Investment, Identifier [Axis]: Odessa Technologies, Inc. | Software 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [9],[14] 0 [11],[15]  
Investment, Identifier [Axis]: Odessa Technologies, Inc. | Software 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 20,183 [8],[9] 20,236 [10],[11]  
Investment, Identifier [Axis]: Omnia Partners, LLC , Commercial Services & Supplies      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   6,171  
Investment, Identifier [Axis]: Omnia Partners, LLC, Commercial Services & Supplies      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,125    
Investment, Identifier [Axis]: One Source Virtual, Inc. | Professional Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[14] (13)    
Investment, Identifier [Axis]: OneSource Virtual, Inc. | Professional Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9] 18,874    
Investment, Identifier [Axis]: PG&E Corp., Electric Utilities      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 9,868 9,412  
Investment, Identifier [Axis]: PODS, LLC, Air Freight & Logistics      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 7,369 7,343  
Investment, Identifier [Axis]: Palmdale Oil Co., LLC | Oil, Gas & Consumable Fuels      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,328 [9] 3,335 [11]  
Investment, Identifier [Axis]: Peer Holding III B.V., Broadline Retail      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,907 5,961  
Investment, Identifier [Axis]: PennantPark Credit Opportunities Fund II, LP | Capital Markets      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 718 [16],[17],[23],[25] 552 [7],[19],[24],[26]  
Investment, Identifier [Axis]: PennantPark Credit Opportunities Fund II, LP, Equity/Other Investments      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 718 552 603
Investment, Identifier [Axis]: Peraton Corp., Communications Equipment      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   7,636  
Investment, Identifier [Axis]: Peraton Corp., Communications Equipment, S+ 7.75% (11.52%)      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,971    
Investment, Identifier [Axis]: PetSmart, LLC, Specialty Retail      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,436 2,442  
Investment, Identifier [Axis]: PetVet Care Centers, LLC | Health Care Providers & Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 403 210 [11],[15]  
Investment, Identifier [Axis]: PetVet Care Centers, LLC | Health Care Providers & Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 27,196 [8],[9],[12] 28,841 [10],[11],[13]  
Investment, Identifier [Axis]: Pie Buyer, Inc. | Consumer Staples Distribution & Retail 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,893 [9],[14] 2,323 [11]  
Investment, Identifier [Axis]: Pie Buyer, Inc. | Consumer Staples Distribution & Retail 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 7,787 [8],[9] 7,787 [10],[11]  
Investment, Identifier [Axis]: Pie Buyer, Inc. | Consumer Staples Distribution & Retail 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,042 [8],[9] 2,042 [10],[11]  
Investment, Identifier [Axis]: Pie Buyer, Inc. | Consumer Staples Distribution & Retail 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 35,982 [8],[9],[12] 35,981 [10],[11],[13]  
Investment, Identifier [Axis]: Pie Buyer, Inc. | Consumer Staples Distribution & Retail 5      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,654 [8],[9],[12] 2,660 [10],[11],[13]  
Investment, Identifier [Axis]: Pluralsight, LLC | Software      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[11],[19]   0  
Investment, Identifier [Axis]: Pluralsight, LLC | Software      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[16],[17] 0    
Investment, Identifier [Axis]: Pluralsight, LLC | Software 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,569 [9] 4,600 [11]  
Investment, Identifier [Axis]: Pluralsight, LLC | Software 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,321 [9] 7,422 [11]  
Investment, Identifier [Axis]: Pluralsight, LLC | Software 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (26) [9],[14] 2,336 [11]  
Investment, Identifier [Axis]: Pluralsight, LLC | Software 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[14] (11)    
Investment, Identifier [Axis]: Pluralsight, LLC | Software 5      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[30] 822    
Investment, Identifier [Axis]: Pluto Acquisition I, Inc. | Health Care Providers & Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,329 3,337  
Investment, Identifier [Axis]: Pluto Acquisition I, Inc. | Health Care Providers & Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 32,134 [8],[9] 32,134 [10],[11]  
Investment, Identifier [Axis]: Pluto Acquisition I, Inc., Health Care Providers & Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 8,358 7,984  
Investment, Identifier [Axis]: Point Broadband Acquisition, LLC | Diversified Telecommunication Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[11],[19],[22]   124  
Investment, Identifier [Axis]: Point Broadband Acquisition, LLC | Diversified Telecommunication Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[19],[22]   4,935  
Investment, Identifier [Axis]: Point Broadband Acquisition, LLC | Diversified Telecommunication Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[16],[17],[21] 124    
Investment, Identifier [Axis]: Point Broadband Acquisition, LLC | Diversified Telecommunication Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[16],[17],[21] 4,935    
Investment, Identifier [Axis]: Post Road Equipment Finance, LLC | Asset Based Financing      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[17],[18],[21],[27] 128,252    
Investment, Identifier [Axis]: Post Road Equipment Finance, LLC | Asset Based Financing 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[15],[20],[28]   0  
Investment, Identifier [Axis]: Post Road Equipment Finance, LLC | Asset Based Financing      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[11],[20],[22],[28]   128,252  
Investment, Identifier [Axis]: Post Road Equipment Finance, LLC | Asset Based Financing 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,000 [9],[14],[18],[27] 34,000 [11],[15],[20],[28]  
Investment, Identifier [Axis]: Post Road Equipment Finance, LLC | Asset Based Financing 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[18],[27] 35,000    
Investment, Identifier [Axis]: Post Road Equipment Finance, LLC | Asset Based Financing 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 62,600 [9],[18],[27] 62,601 [11],[20],[28]  
Investment, Identifier [Axis]: Post Road Equipment Finance, LLC, Equity/Other Investments      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 128,252 128,252 119,233
Investment, Identifier [Axis]: Post Road Equipment Finance, LLC, Subordinated Debt 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 62,600 62,601 62,599
Investment, Identifier [Axis]: Post Road Equipment Finance, LLC, Subordinated Debt 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 35,000 34,000 35,000
Investment, Identifier [Axis]: Post Road Equipment Finance, LLC, Subordinated Debt 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,000 0 3,000
Investment, Identifier [Axis]: Pregis TopCo, LLC, Containers & Packaging      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,631 6,712  
Investment, Identifier [Axis]: Pretzel Parent, Inc, Entertainment      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,404    
Investment, Identifier [Axis]: Pretzel Parent, Inc., Entertainment      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   3,426  
Investment, Identifier [Axis]: Primo Brands Corp., Beverages      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,141    
Investment, Identifier [Axis]: ProAmpac PG Borrower, LLC, Chemicals      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,802    
Investment, Identifier [Axis]: Proofpoint, Inc, Software      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,379    
Investment, Identifier [Axis]: Proofpoint, Inc., Software      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   6,644  
Investment, Identifier [Axis]: Pug, LLC, Entertainment      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,400 2,474  
Investment, Identifier [Axis]: Questex, Inc. | Media 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (32) [9],[14] (32) [11],[15]  
Investment, Identifier [Axis]: Questex, Inc. | Media 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 14,665 [9],[12] 14,703 [11],[13]  
Investment, Identifier [Axis]: Quikrete Holdings, Inc., Construction Materials 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,485 4,517  
Investment, Identifier [Axis]: Quikrete Holdings, Inc., Construction Materials 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,518 2,538  
Investment, Identifier [Axis]: RMP Group, Inc. | Health Care Technology      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 54 [9],[16],[17],[21] 246 [7],[11],[19],[22]  
Investment, Identifier [Axis]: Radiology Partners, Inc, Health Care Providers & Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 7,446    
Investment, Identifier [Axis]: Radiology Partners, Inc., Health Care Providers & Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   7,570  
Investment, Identifier [Axis]: Raven Acquisition Holdings, LLC, Health Care Providers & Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 9,506 9,754  
Investment, Identifier [Axis]: Raven Acquisition Holdings, LLC, Health Care Providers & Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (14) 2  
Investment, Identifier [Axis]: Reagent Chemical and Research, LLC | Chemicals 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,311 [9] 5,605 [11]  
Investment, Identifier [Axis]: Reagent Chemical and Research, LLC | Chemicals 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [9],[14] 0 [11],[15]  
Investment, Identifier [Axis]: Reagent Chemical and Research, LLC | Chemicals 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 43,370 [8],[9],[12] 44,417 [10],[11],[13]  
Investment, Identifier [Axis]: Recess Holdings, Inc., Household Durables      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,336 5,373  
Investment, Identifier [Axis]: Red Planet Borrower, LLC, Media      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 7,305 7,506  
Investment, Identifier [Axis]: Relativity Oda, LLC | Software      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   7,717  
Investment, Identifier [Axis]: Renaissance Holdings Corp., Diversified Consumer Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,921 3,613  
Investment, Identifier [Axis]: Resideo Funding, Inc., Building Products      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,894 1,934  
Investment, Identifier [Axis]: Resilience Parent, LLC | Electrical Equipment      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9] 13,483    
Investment, Identifier [Axis]: Resolute Investment Managers, Inc. | Capital Markets      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[16],[17] 2,022    
Investment, Identifier [Axis]: Resolute Investment Managers, Inc. | Financial Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[11],[19]   2,022  
Investment, Identifier [Axis]: Resolute Investment Managers, Inc., Capital Markets      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 991    
Investment, Identifier [Axis]: Resolute Investment Managers, Inc., Financial Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   991  
Investment, Identifier [Axis]: Rialto Management Group, LLC | Capital Markets 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[14] 0    
Investment, Identifier [Axis]: Rialto Management Group, LLC | Capital Markets 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[9],[12] 20,178    
Investment, Identifier [Axis]: Rialto Management Group, LLC | Financial Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[15]   0  
Investment, Identifier [Axis]: Rialto Management Group, LLC | Financial Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11],[13]   20,178  
Investment, Identifier [Axis]: Rithum Holdings, Inc., Software      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,720 4,977  
Investment, Identifier [Axis]: Roadsafe Holdings, Inc. | Construction & Engineering 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[9] 7,286    
Investment, Identifier [Axis]: Roadsafe Holdings, Inc. | Construction & Engineering 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[9] 6,779    
Investment, Identifier [Axis]: Roadsafe Holdings, Inc. | Construction & Engineering 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[9],[12] 11,930    
Investment, Identifier [Axis]: Roadsafe Holdings, Inc. | Construction & Engineering 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[9],[12] 1,075    
Investment, Identifier [Axis]: Roadsafe Holdings, Inc. | Transportation Infrastructure 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   7,286  
Investment, Identifier [Axis]: Roadsafe Holdings, Inc. | Transportation Infrastructure 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   6,779  
Investment, Identifier [Axis]: Roadsafe Holdings, Inc. | Transportation Infrastructure 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11],[13]   11,930  
Investment, Identifier [Axis]: Roadsafe Holdings, Inc. | Transportation Infrastructure 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11],[13]   1,075  
Investment, Identifier [Axis]: Roper Industrial Products Investment Co., LLC, Industrial Conglomerates      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   4,973  
Investment, Identifier [Axis]: S&S Holdings, LLC, Textiles, Apparel & luxury goods      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,398 4,668  
Investment, Identifier [Axis]: SCIH Salt Holdings, Inc. | Chemicals      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (15) [9],[14] 315 [11],[15]  
Investment, Identifier [Axis]: Saab Purchaser, Inc. | Software 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (166) [9],[14] (166) [11],[15]  
Investment, Identifier [Axis]: Saab Purchaser, Inc. | Software 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (22) [9],[14] (22) [11],[15]  
Investment, Identifier [Axis]: Saab Purchaser, Inc. | Software 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 17,705 [8],[9] 17,705 [10],[11]  
Investment, Identifier [Axis]: Saranac CLO, Ltd. 20-8A E, Capital Markets      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 673 1,095  
Investment, Identifier [Axis]: Saturn SHC Buyer Holdings, Inc. | Health Care Providers & Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (2,580) [9],[14] (1,290) [11],[15]  
Investment, Identifier [Axis]: Saturn SHC Buyer Holdings, Inc. | Health Care Providers & Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 29,733 [8],[9] 33,449 [10],[11]  
Investment, Identifier [Axis]: Saturn SHC Buyer Holdings, Inc. | Health Care Providers & Services 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 10,394 [8],[9] 11,693 [10],[11]  
Investment, Identifier [Axis]: Saturn Sound Bidco, Ltd. | Aerospace & Defense 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[14],[25] 0    
Investment, Identifier [Axis]: Saturn Sound Bidco, Ltd. | Aerospace & Defense 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[12],[14],[25] 24,800    
Investment, Identifier [Axis]: Saturn Sound Bidco, Ltd. | Trading Companies & Distributors 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[15],[26]   (38)  
Investment, Identifier [Axis]: Saturn Sound Bidco, Ltd. | Trading Companies & Distributors 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11],[13],[26]   24,589  
Investment, Identifier [Axis]: Sedgwick Claims Management Services, Inc., Health Care Providers & Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 7,060 7,239  
Investment, Identifier [Axis]: Sharp Services, LLC, Health Care Providers & Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,006 3,023  
Investment, Identifier [Axis]: Sherlock Buyer Corp. | Professional Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11],[13]   15,558  
Investment, Identifier [Axis]: Sherlock Buyer Corp. | Professional Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [9],[14] 0 [11],[15]  
Investment, Identifier [Axis]: Sherlock Buyer Corp. | Professional Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[9],[12] 15,516    
Investment, Identifier [Axis]: Siena Capital Finance, LLC | Asset Based Financing      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[17],[18] 83,997    
Investment, Identifier [Axis]: Siena Capital Finance, LLC | Asset Based Financing      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 83,500 [9],[18] 77,728 [7],[11],[20]  
Investment, Identifier [Axis]: Siena Capital Finance, LLC | Asset Based Financing 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[20]   77,500  
Investment, Identifier [Axis]: Siena Capital Finance, LLC, Equity/Other Investments      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 83,997 77,728 77,310
Investment, Identifier [Axis]: Siena Capital Finance, LLC, Subordinated Debt      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 83,500 77,500 49,500
Investment, Identifier [Axis]: Simplifi Holdings, Inc. | Media 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   49,524  
Investment, Identifier [Axis]: Simplifi Holdings, Inc. | Media 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,132 [9],[14] 516 [11],[15]  
Investment, Identifier [Axis]: Simplifi Holdings, Inc. | Media 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[9] 49,396    
Investment, Identifier [Axis]: SitusAMC Holdings Corp. | Financial Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[9],[12] 51,999    
Investment, Identifier [Axis]: SitusAMC Holdings Corp. | Financial Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11],[13]   52,130  
Investment, Identifier [Axis]: Skillsoft Corp. | Professional Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [19]   116  
Investment, Identifier [Axis]: Smile Brands, Inc. | Health Care Providers & Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [9],[16],[17] 0 [7],[11],[19]  
Investment, Identifier [Axis]: Smile Brands, Inc. | Health Care Providers & Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[30] 0    
Investment, Identifier [Axis]: Smile Brands, Inc. | Health Care Providers & Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11]   9  
Investment, Identifier [Axis]: Sonrava Health Holdings, LLC, Health Care Providers & Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,754 1,754  
Investment, Identifier [Axis]: Sonrava Health Holdings, LLC, Health Care Providers & Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 317 1,617  
Investment, Identifier [Axis]: Sonrava Health Holdings, LLC, Health Care Providers & Services 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,639 311  
Investment, Identifier [Axis]: Sotera Health Holdings, LLC, Life Sciences Tools & Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 7,391 7,442  
Investment, Identifier [Axis]: Sound Point CLO, Ltd. 17-2A E, Capital Markets      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,540 1,820  
Investment, Identifier [Axis]: Sound Point CLO, Ltd. 18-3A D, Capital Markets      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 637 819  
Investment, Identifier [Axis]: Specialty Building Products Holdings, LLC, Building Products      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,427 4,583  
Investment, Identifier [Axis]: Squan Holding Corp. | Wireless Telecommunication Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[16],[17] 0    
Investment, Identifier [Axis]: Squan Holding Corp. | Wireless Telecommunication Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[11],[19]   0  
Investment, Identifier [Axis]: Staples, Inc., Business Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   704,292  
Investment, Identifier [Axis]: Staples, Inc., Specialty Retail      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,672 2,799  
Investment, Identifier [Axis]: Starlight Parent, LLC, Software      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,624 5,472  
Investment, Identifier [Axis]: Stonepeak Nile Parent, LLC , Air Freight & Logistics      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   4,373  
Investment, Identifier [Axis]: Stonepeak Nile Parent, LLC, Air Freight & Logistics      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,352    
Investment, Identifier [Axis]: Striper Buyer, LLC | Containers & Packaging      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[9] 16,093    
Investment, Identifier [Axis]: Striper Buyer, LLC | Containers & Packaging      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   16,652  
Investment, Identifier [Axis]: SunMed Group Holdings, LLC | Health Care Equipment & Supplies 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [9],[14] 0 [11],[15]  
Investment, Identifier [Axis]: SunMed Group Holdings, LLC | Health Care Equipment & Supplies 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 12,405 [8],[9] 12,438 [10],[11]  
Investment, Identifier [Axis]: Symphony CLO, Ltd. 2012-9A ER2, Capital Markets      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,389 2,779  
Investment, Identifier [Axis]: TEI Intermediate, LLC | Commercial Services & Supplies 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[15]   859  
Investment, Identifier [Axis]: TEI Intermediate, LLC | Commercial Services & Supplies 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,771 [9],[14] 932 [11],[15]  
Investment, Identifier [Axis]: TEI Intermediate, LLC | Commercial Services & Supplies 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[14] 859    
Investment, Identifier [Axis]: TEI Intermediate, LLC | Commercial Services & Supplies 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 23,180 [8],[9],[12] 23,015 [10],[11],[13]  
Investment, Identifier [Axis]: TK Elevator Midco GmbH, Machinery      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,604    
Investment, Identifier [Axis]: Tax Defense Network, LLC | Diversified Consumer Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [9],[30] 0 [11],[29]  
Investment, Identifier [Axis]: Tax Defense Network, LLC | Diversified Consumer Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [9],[30] 0 [11],[29]  
Investment, Identifier [Axis]: Tax Defense Network, LLC | Diversified Consumer Services 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,203 [9],[30] 6,022 [11],[29]  
Investment, Identifier [Axis]: Tax Defense Network, LLC | Diversified Consumer Services 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [9],[16],[17] 0 [7],[11],[19]  
Investment, Identifier [Axis]: Tax Defense Network, LLC | Diversified Consumer Services 5      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [9],[16],[17] 0 [7],[11],[19]  
Investment, Identifier [Axis]: Tecta America Corp., Construction & Engineering      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,430 5,485  
Investment, Identifier [Axis]: Tennenbaum Waterman Fund, LP | Capital Markets      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 465 [16],[17],[23],[25] 461 [7],[19],[24],[26]  
Investment, Identifier [Axis]: Tennenbaum Waterman Fund, LP, Equity/Other Investments      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 465 461 5,802
Investment, Identifier [Axis]: The NPD Group, LP | Professional Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [9],[14] 0 [11],[15]  
Investment, Identifier [Axis]: The NPD Group, LP | Professional Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 52,102 [8],[9] 52,102 [10],[11]  
Investment, Identifier [Axis]: Therapy Brands Holdings, LLC | Health Care Technology 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,550 [8],[9] 5,565 [10],[11]  
Investment, Identifier [Axis]: Therapy Brands Holdings, LLC | Health Care Technology 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,677 [8],[9] 4,786 [10],[11]  
Investment, Identifier [Axis]: Tivity Health, Inc. | Health Care Providers & Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[9] 24,229    
Investment, Identifier [Axis]: Tivity Health, Inc. | Health Care Providers & Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   24,291  
Investment, Identifier [Axis]: TransDigm, Inc., Aerospace & Defense      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,890 3,914  
Investment, Identifier [Axis]: Travelpro Products, Inc. | Textiles, Apparel & luxury goods      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 134 [9],[16],[17],[25] 183 [7],[11],[19],[26]  
Investment, Identifier [Axis]: Traverse Midstream Partners, LLC, Oil, Gas & Consumable Fuels      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 9,841 9,859  
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corp. | Professional Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 16,184 [9] 0 [11],[15]  
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corp. | Professional Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [9],[14] 0 [11],[15]  
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corp. | Professional Services 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [9],[14] 16,224 [11]  
Investment, Identifier [Axis]: Triple Lift, Inc. | Media 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (282) [9],[14] (282) [11],[15]  
Investment, Identifier [Axis]: Triple Lift, Inc. | Media 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 36,539 [8],[9],[12] 36,635 [10],[11],[13]  
Investment, Identifier [Axis]: Triton Water Holdings, Inc., Beverages      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   7,402  
Investment, Identifier [Axis]: Truck Hero, Inc, Automobile Components 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,025    
Investment, Identifier [Axis]: Truck Hero, Inc, Automobile Components 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,596    
Investment, Identifier [Axis]: Truck Hero, Inc., Automobile Components 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   3,428  
Investment, Identifier [Axis]: Truck Hero, Inc., Automobile Components 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   6,391  
Investment, Identifier [Axis]: Trystar, LLC | Electrical Equipment 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 12,583 [9] 2,926 [11],[15]  
Investment, Identifier [Axis]: Trystar, LLC | Electrical Equipment 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [9],[14] 0 [11],[15]  
Investment, Identifier [Axis]: Trystar, LLC | Electrical Equipment 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 22,896 [8],[9],[12] 24,549 [10],[11],[13]  
Investment, Identifier [Axis]: Trystar, LLC | Electrical Equipment 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 10,338 [9],[12] 10,364 [11],[13]  
Investment, Identifier [Axis]: UKG, Inc., Software      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 9,173 9,642  
Investment, Identifier [Axis]: US Anesthesia Partners, Inc., Health Care Providers & Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,890 6,938  
Investment, Identifier [Axis]: US Oral Surgery Management Holdco, LLC | Health Care Providers & Services 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   6,098  
Investment, Identifier [Axis]: US Oral Surgery Management Holdco, LLC | Health Care Providers & Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,050 [9] 5,050 [11]  
Investment, Identifier [Axis]: US Oral Surgery Management Holdco, LLC | Health Care Providers & Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [9],[14] 0 [11],[15]  
Investment, Identifier [Axis]: US Oral Surgery Management Holdco, LLC | Health Care Providers & Services 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 6,997 [8],[9] 6,997 [10],[11]  
Investment, Identifier [Axis]: US Oral Surgery Management Holdco, LLC | Health Care Providers & Services 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[9] 6,098    
Investment, Identifier [Axis]: US Oral Surgery Management Holdco, LLC | Health Care Providers & Services 5      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 17,668 [8],[9] 17,668 [10],[11]  
Investment, Identifier [Axis]: US Salt Investors, LLC | Chemicals 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[14],[25] 16,514    
Investment, Identifier [Axis]: US Salt Investors, LLC | Chemicals 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[14],[25] (19)    
Investment, Identifier [Axis]: US Salt Investors, LLC | Metals & Mining 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[15]   0  
Investment, Identifier [Axis]: US Salt Investors, LLC | Metals & Mining 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   25,657  
Investment, Identifier [Axis]: United Airlines, Inc., Passenger Airlines      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,685 3,722  
Investment, Identifier [Axis]: University Support Services, LLC , Diversified Consumer Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   3,882  
Investment, Identifier [Axis]: University Support Services, LLC, Diversified Consumer Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,906    
Investment, Identifier [Axis]: Urban One, Inc. | Media      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7]   235  
Investment, Identifier [Axis]: Urban One, Inc. | Media 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[17] 157    
Investment, Identifier [Axis]: Urban One, Inc. | Media 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [17] 365    
Investment, Identifier [Axis]: VFH Parent, LLC, Capital Markets      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,942 5,010  
Investment, Identifier [Axis]: Vanco Payment Solutions, LLC | Software 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 11,120 [9] (5) [11],[15]  
Investment, Identifier [Axis]: Vanco Payment Solutions, LLC | Software 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[14] (5)    
Investment, Identifier [Axis]: Vanco Payment Solutions, LLC| Software 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11]   11,147  
Investment, Identifier [Axis]: Varicent Intermediate Holdings Corp. | Software 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11]   5,423  
Investment, Identifier [Axis]: Varicent Intermediate Holdings Corp. | Software 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,825 [9] 0 [11],[15]  
Investment, Identifier [Axis]: Varicent Intermediate Holdings Corp. | Software 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[14] (21)    
Investment, Identifier [Axis]: Varicent Intermediate Holdings Corp. | Software 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (43) [9],[14] 0 [11],[15]  
Investment, Identifier [Axis]: Varicent Intermediate Holdings Corp. | Software 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (54) [9],[14] 0 [11],[15]  
Investment, Identifier [Axis]: Varicent Intermediate Holdings Corp. | Software 5      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 20,906 [8],[9],[12] 21,107 [10],[11],[13]  
Investment, Identifier [Axis]: Venture CLO 43, Ltd. 21-43A E, Capital Markets      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,917 2,715  
Investment, Identifier [Axis]: Victors CCC Buyer, LLC | Professional Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,976 [9] 1,551 [11]  
Investment, Identifier [Axis]: Victors CCC Buyer, LLC | Professional Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 944 [9] 0 [11],[15]  
Investment, Identifier [Axis]: Victors CCC Buyer, LLC | Professional Services 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,547 [9] 23,455 [10],[11]  
Investment, Identifier [Axis]: Victors CCC Buyer, LLC | Professional Services 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[14] 0    
Investment, Identifier [Axis]: Victors CCC Buyer, LLC | Professional Services 5      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[14] 0    
Investment, Identifier [Axis]: Victors CCC Buyer, LLC | Professional Services 6      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[9] 23,395    
Investment, Identifier [Axis]: Victory Buyer, LLC | Building Products      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [10],[11]   45,990  
Investment, Identifier [Axis]: Victory Buyer, LLC | Machinery      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[9] 37,949    
Investment, Identifier [Axis]: Victory Buyer, LLC, Building Products      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   7,375  
Investment, Identifier [Axis]: WCG Intermediate Corp., Health Care Providers & Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,341    
Investment, Identifier [Axis]: WCG Purchaser Corp., Health Care Providers & Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   4,479  
Investment, Identifier [Axis]: WHCG Purchaser III, Inc. | Health Care Providers & Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 24,397 [9] 24,091 [11]  
Investment, Identifier [Axis]: WHCG Purchaser III, Inc. | Health Care Providers & Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 9,882 [9],[30] 9,645 [11],[29]  
Investment, Identifier [Axis]: WHCG Purchaser III, Inc. | Health Care Providers & Services 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [9],[16],[17] 0 [7],[11],[19]  
Investment, Identifier [Axis]: WIN Holdings III Corp. | Diversified Consumer Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,192 [9],[14] 1,192 [11],[15]  
Investment, Identifier [Axis]: WIN Holdings III Corp. | Diversified Consumer Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 41,683 [8],[9] 41,683 [10],[11]  
Investment, Identifier [Axis]: WIN Holdings III Corp. | Diversified Consumer Services 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 9,890 [8],[9] 9,915 [10],[11]  
Investment, Identifier [Axis]: WIN Holdings III Corp. | Diversified Consumer Services 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 20,204 [8],[9] 20,255 [10],[11]  
Investment, Identifier [Axis]: WPNT, LLC | Media      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [7],[11],[19],[20],[22]   0  
Investment, Identifier [Axis]: WPNT, LLC, Equity/Other Investments      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   0 $ 0
Investment, Identifier [Axis]: West Coast Dental Services, Inc. | Health Care Providers & Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 2,901 [9],[14] 2,898 [11],[15]  
Investment, Identifier [Axis]: West Coast Dental Services, Inc. | Health Care Providers & Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 1,328 [8],[9] 1,332 [10],[11]  
Investment, Identifier [Axis]: West Coast Dental Services, Inc. | Health Care Providers & Services 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 22,242 [8],[9] 22,299 [10],[11]  
Investment, Identifier [Axis]: WestJet Loyalty, LP, Passenger Airlines      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,508 5,718  
Investment, Identifier [Axis]: Westwood Professional Services, Inc. | Construction & Engineering 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 4,417 [9],[14] 4,429 [11],[15]  
Investment, Identifier [Axis]: Westwood Professional Services, Inc. | Construction & Engineering 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [9],[14] 0 [11],[15]  
Investment, Identifier [Axis]: Westwood Professional Services, Inc. | Construction & Engineering 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 44,735 [8],[9],[12] 44,848 [10],[11],[13]  
Investment, Identifier [Axis]: Wharf Street Ratings Acquisition, LLC | Capital Markets 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [11],[15]   (28)  
Investment, Identifier [Axis]: Wharf Street Ratings Acquisition, LLC | Capital Markets 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (26) [9],[14] (28) [11],[15]  
Investment, Identifier [Axis]: Wharf Street Ratings Acquisition, LLC | Capital Markets 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[14] (26)    
Investment, Identifier [Axis]: Wharf Street Ratings Acquisition, LLC | Capital Markets 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 25,496 [8],[9] 25,550 [10],[11]  
Investment, Identifier [Axis]: White Cap Supply Holdings, LLC, Building Products      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,054 5,301  
Investment, Identifier [Axis]: Whitehorse, Ltd. 14-1A E | Capital Markets      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 69 [9],[17],[25] 62 [7],[11],[26]  
Investment, Identifier [Axis]: Wind River CLO, Ltd. 14-2A FR, Capital Markets      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 179 91  
Investment, Identifier [Axis]: Windsor Holdings III, LLC, Chemicals      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,184 3,249  
Investment, Identifier [Axis]: Wipfli Advisory, LLC | Financial Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (14) [9],[14] (14) [11],[15]  
Investment, Identifier [Axis]: Wipfli Advisory, LLC | Financial Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value (19) [9],[14] (19) [11],[15]  
Investment, Identifier [Axis]: Wipfli Advisory, LLC | Financial Services 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 16,059 [8],[9] 16,057 [10],[11]  
Investment, Identifier [Axis]: World Business Lenders, LLC | Financial Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 3,967 [9],[16],[17] 1,615 [7],[11],[19]  
Investment, Identifier [Axis]: X Corp., Interactive Media & Services 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   4,857  
Investment, Identifier [Axis]: X Corp., Interactive Media & Services 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value   7,468  
Investment, Identifier [Axis]: YummyEarth, Inc. | Food Products      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 0 [9],[16],[17] 0 [7],[11],[19]  
Investment, Identifier [Axis]: Zayo Group Holdings, Inc., Diversified Telecommunication Services      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,871 4,242  
Investment, Identifier [Axis]: Zendesk, Inc. | Software 1      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 5,390 [9] 10,462 [11]  
Investment, Identifier [Axis]: Zendesk, Inc. | Software 2      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value 10,268 [9] 64,884 [10],[11]  
Investment, Identifier [Axis]: Zendesk, Inc. | Software 3      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [9],[14] (105)    
Investment, Identifier [Axis]: Zendesk, Inc. | Software 4      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value [8],[9] 63,689    
FBLC Senior Loan Fund, LLC      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Total assets 738,553 751,516  
Fair Value $ 678,693 $ 704,292  
Number of Portfolio companies in SLF | portfolioCompany 137 139  
FBLC Senior Loan Fund, LLC | Investment, Identifier [Axis]: Largest Portfolio Company Investment      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value $ 13,341 $ 13,952  
FBLC Senior Loan Fund, LLC | Investment, Identifier [Axis]: Top Five Largest Portfolio Company Investments      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Fair Value $ 57,201 $ 62,136  
FBLC Senior Loan Fund, LLC | Weighted average      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Weighted Average Current Yield for Total Portfolio 7.80% 7.90%  
[1] Percentages are based on net assets attributable to common stock as of March 31, 2026.
[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, 2025.
[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 (as defined below).
[7] 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, 2025, the aggregate fair value of these securities is $523.7 million or 28.5% of the Company’s net assets. The initial acquisition dates have been included for such securities.
[8] The Company's investment or a portion thereof is pledged as collateral under the JPM Credit Facility.
[9] 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).
[10] The Company's investment or a portion thereof is pledged as collateral under the JPM Credit Facility (as defined below).
[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 (as defined below). Individual investments can be divided into parts which are pledged to separate credit facilities.
[13] 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.
[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] 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.
[16] Non-income producing at March 31, 2026.
[17] Securities exempt from registration under the Securities Act of 1933 (as defined below), and may be deemed to be “restricted securities.” As of March 31, 2026, the aggregate fair value of these securities is $533.7 million or 29.1% of the Company’s net assets. The initial acquisition dates have been included for such securities.
[18] 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.”
[19] Non-income producing at December 31, 2025.
[20] 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.”
[21] Investments are held in the taxable wholly-owned, consolidated subsidiary, 54th Street Equity Holdings, Inc.
[22] Investments are held in the taxable wholly-owned, consolidated subsidiary, 54th Street Equity Holdings, Inc.
[23] 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.”
[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] 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 March 31, 2026, qualifying assets represent 92.3% of the Company's total assets.
[26] 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, 2025, qualifying assets represent 92.2% of the Company's total assets.
[27] 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.
[28] 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.
[29] The investment is on non-accrual status as of December 31, 2025.
[30] The investment is on non-accrual status as of March 31, 2026.
[31] 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 March 31, 2026.
[32] 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, 2025.
[33] 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.
[34] 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.