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Unaudited Consolidated Schedule of Investments
€ in Millions, £ in Millions, kr in Millions, kr in Millions, $ in Millions, $ in Millions
Sep. 30, 2023
USD ($)
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Sep. 30, 2023
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Sep. 30, 2023
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Sep. 30, 2023
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Sep. 30, 2023
AUD ($)
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Sep. 30, 2023
CAD ($)
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Dec. 31, 2022
USD ($)
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Dec. 31, 2022
EUR (€)
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Dec. 31, 2022
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Dec. 31, 2022
ISK (kr)
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Dec. 31, 2022
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Dec. 31, 2021
USD ($)
Percent of net assets 210.40% 210.40% 210.40% 210.40% 210.40% 210.40% 210.40% 219.30% 219.30% 219.30% 219.30% 219.30% 219.30%  
Amortized Cost $ 15,365,800,000             $ 16,314,100,000            
Fair Value $ 14,666,100,000 [1]             $ 15,377,300,000 [2]            
Liabilities in excess of other assets percentage 110.40% 110.40% 110.40% 110.40% 110.40% 110.40% 110.40% 119.30% 119.30% 119.30% 119.30% 119.30% 119.30%  
Liabilities in excess of other assets $ (7,696,100,000) [1]             $ (8,365,300,000) [2]            
Net Assets $ 6,970,000,000 [1]             $ 7,012,000,000 [2]            
Net Senior Secured Loans—First Lien                            
Percent of net assets 125.80% [3] 125.80% [3] 125.80% [3] 125.80% [3] 125.80% [3] 125.80% [3] 125.80% [3] 132.30% [4] 132.30% [4] 132.30% [4] 132.30% [4] 132.30% [4] 132.30% [4]  
Amortized Cost $ 9,100,400,000             $ 9,607,500,000            
Fair Value 8,768,900,000 [1]             9,278,400,000 [2]            
Funded, Senior Secured Loans—First Lien                            
Amortized Cost 9,978,200,000             10,515,600,000            
Fair Value 9,646,700,000 [1]             10,186,500,000 [2]            
Unfunded, Senior Secured Loans—First Lien                            
Amortized Cost (877,800,000)             (908,100,000)            
Fair Value $ (877,800,000) [1]             $ (908,100,000) [2]            
Net Senior Secured Loans—Second Lien                            
Percent of net assets 15.70% [3] 15.70% [3] 15.70% [3] 15.70% [3] 15.70% [3] 15.70% [3] 15.70% [3] 17.00% [4] 17.00% [4] 17.00% [4] 17.00% [4] 17.00% [4] 17.00% [4]  
Amortized Cost $ 1,156,700,000             $ 1,299,200,000            
Fair Value 1,096,100,000 [1]             1,194,500,000 [2]            
Funded, Senior Secured Loans—Second Lien                            
Amortized Cost 1,159,700,000             1,302,300,000            
Fair Value 1,099,100,000 [1]             1,197,600,000 [2]            
Unfunded, Senior Secured Loans—Second Lien                            
Amortized Cost (3,000,000.0)             (3,100,000)            
Fair Value $ (3,000,000.0) [1]             $ (3,100,000) [2]            
Other Senior Secured Debt                            
Percent of net assets 1.80% [3] 1.80% [3] 1.80% [3] 1.80% [3] 1.80% [3] 1.80% [3] 1.80% [3] 1.60% [4] 1.60% [4] 1.60% [4] 1.60% [4] 1.60% [4] 1.60% [4]  
Amortized Cost $ 133,400,000             $ 151,900,000            
Fair Value $ 128,400,000 [1]             $ 109,800,000 [2]            
Net Subordinated Debt                            
Percent of net assets 4.30% [3] 4.30% [3] 4.30% [3] 4.30% [3] 4.30% [3] 4.30% [3] 4.30% [3] 3.80% [4] 3.80% [4] 3.80% [4] 3.80% [4] 3.80% [4] 3.80% [4]  
Amortized Cost $ 284,900,000             $ 383,900,000            
Fair Value 297,600,000 [1]             $ 265,000,000.0 [2]            
Funded, Subordinated Debt                            
Amortized Cost 289,700,000                          
Fair Value [1] 302,400,000                          
Unfunded, Subordinated Debt                            
Amortized Cost (4,800,000)                          
Fair Value [1] $ (4,800,000)                          
Net Asset Based Finance                            
Percent of net assets 25.00% [3] 25.00% [3] 25.00% [3] 25.00% [3] 25.00% [3] 25.00% [3] 25.00% [3] 27.10% [4] 27.10% [4] 27.10% [4] 27.10% [4] 27.10% [4] 27.10% [4]  
Amortized Cost $ 1,925,600,000             $ 2,023,600,000            
Fair Value 1,739,500,000 [1]             1,902,500,000 [2]            
Funded - Asset Based Finance                            
Amortized Cost 1,967,300,000             2,067,200,000            
Fair Value 1,781,200,000 [1]             1,946,100,000 [2]            
Unfunded - Asset Based Finance                            
Amortized Cost (41,700,000)             (43,600,000)            
Fair Value $ (41,700,000) [1]             $ (43,600,000) [2]            
Credit Opportunities Partners JV, LLC                            
Percent of net assets 20.10% [3] 20.10% [3] 20.10% [3] 20.10% [3] 20.10% [3] 20.10% [3] 20.10% [3] 20.40% [4] 20.40% [4] 20.40% [4] 20.40% [4] 20.40% [4] 20.40% [4]  
Amortized Cost $ 1,571,700,000             $ 1,571,700,000            
Fair Value $ 1,403,200,000 [1]             $ 1,428,300,000 [2]            
Equity/Other                            
Percent of net assets 17.70% [3],[5] 17.70% [3],[5] 17.70% [3],[5] 17.70% [3],[5] 17.70% [3],[5] 17.70% [3],[5] 17.70% [3],[5] 17.10% [4],[6] 17.10% [4],[6] 17.10% [4],[6] 17.10% [4],[6] 17.10% [4],[6] 17.10% [4],[6]  
Amortized Cost $ 1,193,100,000             $ 1,276,300,000            
Fair Value 1,232,400,000 [1]             1,198,800,000 [2]            
Investment, Identifier [Axis]: Affordable Care Inc, Common Stock, Equity/Other                            
Fair Value               49,900,000           $ 52,100,000
Investment, Identifier [Axis]: Belk Inc, Senior Secured Loans—Second Lien                            
Fair Value               3,300,000           6,700,000
Investment, Identifier [Axis]: Fairway Group Holdings Corp , Senior Secured Loans—Second Lien                            
Fair Value               0           0
Investment, Identifier [Axis]: Fronton BV, Common Stock, Equity/Other                            
Fair Value               1,000,000.0           1,400,000
Investment, Identifier [Axis]: Home Partners JV 2, Private Equity 1, Asset Based Finance                            
Fair Value               200,000           100,000
Investment, Identifier [Axis]: Home Partners JV 2, Private Equity 2, Asset Based Finance -1                            
Fair Value               5,000,000.0           1,600,000
Investment, Identifier [Axis]: Home Partners JV, Private Equity, Asset Based Finance -1                            
Fair Value               0           9,400,000
Investment, Identifier [Axis]: Home Partners JV, Structured Mezzanine, Asset Based Finance                            
Fair Value               0           90,400,000
Investment, Identifier [Axis]: JW Aluminum Co, Common Stock                            
Fair Value 2,400,000             2,400,000            
Investment, Identifier [Axis]: JW Aluminum Co, Preferred Stock                            
Fair Value 148,200,000             112,500,000            
Investment, Identifier [Axis]: Jet Edge International LLC, Preferred Stock, Asset Based Finance -2                            
Fair Value               0           16,800,000
Investment, Identifier [Axis]: KKR Altitude II Offshore Aggregator LP, Partnership Interest                            
Fair Value 50,000,000.0             44,400,000            
Investment, Identifier [Axis]: Micronics Filtration Holdings Inc, Preferred Stock, Series A, Equity/Other                            
Fair Value               0           100,000
Investment, Identifier [Axis]: Micronics Filtration Holdings Inc, Preferred Stock, Series B PIK 2, Equity/Other                            
Fair Value               0           11,900,000
Investment, Identifier [Axis]: Micronics Filtration Holdings Inc, Preferred Stock, Series B PIK, Equity/Other                            
Fair Value               0           400,000
Investment, Identifier [Axis]: Micronics Filtration Holdings Inc, Preferred Stock, Series C PIK, Equity/Other                            
Fair Value               0           6,200,000
Investment, Identifier [Axis]: NCI Inc, Class A-1 Common Stock                            
Fair Value 0             0            
Investment, Identifier [Axis]: NCI Inc, Class B-1 Common Stock                            
Fair Value 0             0            
Investment, Identifier [Axis]: NCI Inc, Class C Common Stock                            
Fair Value 19,300,000             20,200,000            
Investment, Identifier [Axis]: NCI Inc, Class I-1 Common Stock                            
Fair Value 0             0            
Investment, Identifier [Axis]: PRG III LLC, Preferred Stock, Series A PIK                            
Fair Value 124,800,000             105,700,000            
Investment, Identifier [Axis]: PRG III LLC, Preferred Stock, Series B PIK                            
Fair Value 0             0            
Investment, Identifier [Axis]: Petroplex Acidizing Inc, Warrant, Equity/Other                            
Fair Value               0           0
Investment, Identifier [Axis]: Roemanu LLC (FKA Toorak Capital Partners LLC), Private Equity                            
Fair Value 247,300,000             261,200,000            
Investment, Identifier [Axis]: Sungard Availability Services Capital Inc, Senior Secured Loans—Second Lien                            
Fair Value [7]               0           8,300,000
Investment, Identifier [Axis]: TDC LLP, Preferred Equity 1                            
Fair Value 8,300,000             0            
Investment, Identifier [Axis]: TDC LLP, Preferred Equity 2                            
Fair Value $ 1,900,000             $ 0            
Investment, Identifier [Axis]: 3Pillar Global Inc, Software & Services 1                            
Rate, basis spread on variable rate 6.00% [8],[9] 6.00% [8],[9] 6.00% [8],[9] 6.00% [8],[9] 6.00% [8],[9] 6.00% [8],[9] 6.00% [8],[9] 6.00% [10],[11],[12],[13],[14] 6.00% [10],[11],[12],[13],[14] 6.00% [10],[11],[12],[13],[14] 6.00% [10],[11],[12],[13],[14] 6.00% [10],[11],[12],[13],[14] 6.00% [10],[11],[12],[13],[14]  
Floor 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [11],[12],[13],[14] 0.80% [11],[12],[13],[14] 0.80% [11],[12],[13],[14] 0.80% [11],[12],[13],[14] 0.80% [11],[12],[13],[14] 0.80% [11],[12],[13],[14]  
Principal Amount $ 1,300,000 [9],[15]             $ 101,000,000.0 [11],[12],[13],[14],[16]            
Amortized Cost 1,300,000 [9]             100,200,000 [11],[12],[13],[14]            
Fair Value $ 1,300,000 [1],[9]             $ 96,700,000 [2],[11],[12],[13],[14]            
Investment, Identifier [Axis]: 3Pillar Global Inc, Software & Services 2                            
Rate, basis spread on variable rate 6.00% [8],[9],[17],[18] 6.00% [8],[9],[17],[18] 6.00% [8],[9],[17],[18] 6.00% [8],[9],[17],[18] 6.00% [8],[9],[17],[18] 6.00% [8],[9],[17],[18] 6.00% [8],[9],[17],[18] 6.00% [10],[19] 6.00% [10],[19] 6.00% [10],[19] 6.00% [10],[19] 6.00% [10],[19] 6.00% [10],[19]  
Floor 0.80% [8],[9],[17],[18] 0.80% [8],[9],[17],[18] 0.80% [8],[9],[17],[18] 0.80% [8],[9],[17],[18] 0.80% [8],[9],[17],[18] 0.80% [8],[9],[17],[18] 0.80% [8],[9],[17],[18] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19]  
Principal Amount $ 125,000,000.0 [9],[15],[17],[18]             $ 9,200,000 [16],[19]            
Amortized Cost 124,300,000 [9],[17],[18]             9,200,000 [19]            
Fair Value $ 121,600,000 [1],[9],[17],[18]             $ 8,800,000 [2],[19]            
Investment, Identifier [Axis]: 3Pillar Global Inc, Software & Services 3                            
Rate, basis spread on variable rate 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [10],[19] 6.00% [10],[19] 6.00% [10],[19] 6.00% [10],[19] 6.00% [10],[19] 6.00% [10],[19]  
Floor 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19]  
Principal Amount $ 7,900,000 [15],[20]             $ 24,900,000 [16],[19]            
Amortized Cost 7,900,000 [20]             24,900,000 [19]            
Fair Value $ 7,600,000 [1],[20]             $ 23,800,000 [2],[19]            
Investment, Identifier [Axis]: 48Forty Solutions LLC, Commercial & Professional Services 1                            
Rate, basis spread on variable rate [10],[11],[12],[13],[21],[22]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%  
Floor [11],[12],[13],[21],[22]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [11],[12],[13],[16],[21],[22]               $ 182,700,000            
Amortized Cost [11],[12],[13],[21],[22]               181,200,000            
Fair Value [2],[11],[12],[13],[21],[22]               $ 177,800,000            
Investment, Identifier [Axis]: 48Forty Solutions LLC, Commercial & Professional Services 2                            
Rate, basis spread on variable rate [10],[19]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%  
Floor [19]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [16],[19]               $ 10,600,000            
Amortized Cost [19]               10,600,000            
Fair Value [2],[19]               $ 10,300,000            
Investment, Identifier [Axis]: 48Forty Solutions LLC, Commercial & Professional Services 3                            
Rate, basis spread on variable rate [8],[20] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%              
Floor [8],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [15],[20] $ 6,400,000                          
Amortized Cost [20] 6,400,000                          
Fair Value [1],[20] $ 6,100,000                          
Investment, Identifier [Axis]: 48Forty Solutions LLC,Commercial & Professional Services 1                            
Rate, basis spread on variable rate [8],[9],[18],[23],[24] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%              
Floor [8],[9],[18],[23],[24] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [9],[15],[18],[23],[24] $ 181,300,000                          
Amortized Cost [9],[18],[23],[24] 179,900,000                          
Fair Value [1],[9],[18],[23],[24] $ 173,500,000                          
Investment, Identifier [Axis]: 48Forty Solutions LLC,Commercial & Professional Services 2                            
Rate, basis spread on variable rate [8],[9] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%              
Floor [8],[9] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [9],[15] $ 4,200,000                          
Amortized Cost [9] 4,200,000                          
Fair Value [1],[9] $ 4,100,000                          
Investment, Identifier [Axis]: 5 Arch Income Fund 2 LLC, Diversified Financials                            
Rate, stated interest rate [10],[25],[26],[27],[28],[29]               9.00% 9.00% 9.00% 9.00% 9.00% 9.00%  
Principal Amount [16],[25],[26],[27],[28],[29]               $ 95,500,000            
Amortized Cost [25],[26],[27],[28],[29]               69,900,000            
Fair Value [2],[25],[26],[27],[28],[29]               52,500,000            
Investment, Identifier [Axis]: 5 Arch Income Fund 2 LLC, Financial Services                            
Rate, stated interest rate [8],[30],[31],[32],[33],[34] 9.00% 9.00% 9.00% 9.00% 9.00% 9.00% 9.00%              
Principal Amount [15],[30],[31],[32],[33],[34] $ 84,200,000                          
Amortized Cost [30],[31],[32],[33],[34] 61,700,000                          
Fair Value [1],[30],[31],[32],[33],[34] 28,700,000                          
Investment, Identifier [Axis]: 801 5th Ave, Seattle, Private Equity                            
Fair Value $ 0             $ 6,300,000           23,100,000
Investment, Identifier [Axis]: 801 5th Ave, Seattle, Private Equity, Equity Real Estate Investment Trusts (REITs)                            
Principal (in shares) | shares [9],[15],[33],[34],[35] 8,516,891 8,516,891 8,516,891 8,516,891 8,516,891 8,516,891 8,516,891              
Amortized Cost [9],[33],[34],[35] $ 14,000,000.0                          
Fair Value [1],[9],[33],[34],[35] 0                          
Investment, Identifier [Axis]: 801 5th Ave, Seattle, Private Equity, Real Estate                            
Principal (in shares) | shares [13],[16],[28],[29],[36]               8,516,891 8,516,891 8,516,891 8,516,891 8,516,891 8,516,891  
Amortized Cost [13],[28],[29],[36]               $ 14,000,000.0            
Fair Value [2],[13],[28],[29],[36]               6,300,000            
Investment, Identifier [Axis]: 801 5th Ave, Seattle, Structure Mezzanine                            
Fair Value $ 54,600,000             $ 58,900,000           57,200,000
Investment, Identifier [Axis]: 801 5th Ave, Seattle, Structure Mezzanine, Equity Real Estate Investment Trusts (REITs)                            
Rate, PIK [8],[9],[34],[35] 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00%              
Rate, Max PIK [8],[9],[34],[35] 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00%              
Rate, stated interest rate [8],[9],[34],[35] 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%              
Principal Amount [9],[15],[34],[35] $ 58,900,000                          
Amortized Cost [9],[34],[35] 57,100,000                          
Fair Value [1],[9],[34],[35] 54,600,000                          
Investment, Identifier [Axis]: 801 5th Ave, Seattle, Structure Mezzanine, Real Estate                            
Rate, basis spread on variable rate [10],[13],[29],[36]               8.00% 8.00% 8.00% 8.00% 8.00% 8.00%  
Rate, PIK [10],[13],[29],[36]               3.00% 3.00% 3.00% 3.00% 3.00% 3.00%  
Rate, Max PIK [10],[13],[29],[36]               3.00% 3.00% 3.00% 3.00% 3.00% 3.00%  
Principal Amount [13],[16],[29],[36]               $ 58,900,000            
Amortized Cost [13],[29],[36]               57,000,000.0            
Fair Value [2],[13],[29],[36]               58,900,000            
Investment, Identifier [Axis]: ATX Networks Corp 1                            
Fair Value 66,000,000.0             40,600,000           46,800,000
Investment, Identifier [Axis]: ATX Networks Corp 2                            
Fair Value $ 32,900,000             $ 21,900,000           7,100,000
Investment, Identifier [Axis]: ATX Networks Corp, Capital Goods                            
Rate, PIK [8],[9],[34],[35],[37] 10.00% 10.00% 10.00% 10.00% 10.00% 10.00% 10.00%              
Rate, Max PIK [8],[9],[34],[35],[37] 10.00% 10.00% 10.00% 10.00% 10.00% 10.00% 10.00%              
Principal Amount [9],[15],[34],[35],[37] $ 32,900,000                          
Amortized Cost [9],[34],[35],[37] 19,200,000                          
Fair Value [1],[9],[34],[35],[37] $ 32,900,000                          
Investment, Identifier [Axis]: ATX Networks Corp, Capital Goods 1                            
Rate, basis spread on variable rate 7.50% [8],[9],[34],[35],[37] 7.50% [8],[9],[34],[35],[37] 7.50% [8],[9],[34],[35],[37] 7.50% [8],[9],[34],[35],[37] 7.50% [8],[9],[34],[35],[37] 7.50% [8],[9],[34],[35],[37] 7.50% [8],[9],[34],[35],[37] 7.50% [10],[13],[29],[36],[38] 7.50% [10],[13],[29],[36],[38] 7.50% [10],[13],[29],[36],[38] 7.50% [10],[13],[29],[36],[38] 7.50% [10],[13],[29],[36],[38] 7.50% [10],[13],[29],[36],[38]  
Floor 1.00% [8],[9],[34],[35],[37] 1.00% [8],[9],[34],[35],[37] 1.00% [8],[9],[34],[35],[37] 1.00% [8],[9],[34],[35],[37] 1.00% [8],[9],[34],[35],[37] 1.00% [8],[9],[34],[35],[37] 1.00% [8],[9],[34],[35],[37] 1.00% [13],[29],[36],[38] 1.00% [13],[29],[36],[38] 1.00% [13],[29],[36],[38] 1.00% [13],[29],[36],[38] 1.00% [13],[29],[36],[38] 1.00% [13],[29],[36],[38]  
Principal Amount $ 66,000,000.0 [9],[15],[34],[35],[37]             $ 40,600,000 [13],[16],[29],[36],[38]            
Amortized Cost 66,000,000.0 [9],[34],[35],[37]             40,600,000 [13],[29],[36],[38]            
Fair Value $ 66,000,000.0 [1],[9],[34],[35],[37]             $ 40,600,000 [2],[13],[29],[36],[38]            
Investment, Identifier [Axis]: ATX Networks Corp, Capital Goods 2                            
Rate, basis spread on variable rate [8],[20],[34],[35] 7.50% 7.50% 7.50% 7.50% 7.50% 7.50% 7.50%              
Rate, PIK [10],[13],[29],[36],[38],[39]               10.00% 10.00% 10.00% 10.00% 10.00% 10.00%  
Rate, Max PIK [10],[13],[29],[36],[38],[39]               10.00% 10.00% 10.00% 10.00% 10.00% 10.00%  
Floor [8],[20],[34],[35] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount $ 63,000,000.0 [15],[20],[34],[35]             $ 21,900,000 [13],[16],[29],[36],[38],[39]            
Amortized Cost 63,000,000.0 [20],[34],[35]             8,400,000 [13],[29],[36],[38],[39]            
Fair Value 63,000,000.0 [1],[20],[34],[35]             21,900,000 [2],[13],[29],[36],[38],[39]            
Investment, Identifier [Axis]: ATX Networks Corp, Class B-1 Common Stock                            
Fair Value $ 5,000,000.0             $ 5,000,000.0           0
Investment, Identifier [Axis]: ATX Networks Corp, Class B-1 Common Stock, Capital Goods                            
Principal (in shares) | shares 500 [9],[33],[34],[35] 500 [9],[33],[34],[35] 500 [9],[33],[34],[35] 500 [9],[33],[34],[35] 500 [9],[33],[34],[35] 500 [9],[33],[34],[35] 500 [9],[33],[34],[35] 500 [13],[28],[29],[36] 500 [13],[28],[29],[36] 500 [13],[28],[29],[36] 500 [13],[28],[29],[36] 500 [13],[28],[29],[36] 500 [13],[28],[29],[36]  
Amortized Cost $ 5,000,000.0 [9],[33],[34],[35]             $ 5,000,000.0 [13],[28],[29],[36]            
Fair Value 5,000,000.0 [1],[9],[33],[34],[35]             5,000,000.0 [2],[13],[28],[29],[36]            
Investment, Identifier [Axis]: ATX Networks Corp, Class B-2 Common Stock                            
Fair Value $ 9,000,000.0             $ 9,000,000.0           0
Investment, Identifier [Axis]: ATX Networks Corp, Class B-2 Common Stock, Capital Goods                            
Principal (in shares) | shares 900 [9],[33],[34],[35] 900 [9],[33],[34],[35] 900 [9],[33],[34],[35] 900 [9],[33],[34],[35] 900 [9],[33],[34],[35] 900 [9],[33],[34],[35] 900 [9],[33],[34],[35] 900 [13],[28],[29],[36] 900 [13],[28],[29],[36] 900 [13],[28],[29],[36] 900 [13],[28],[29],[36] 900 [13],[28],[29],[36] 900 [13],[28],[29],[36]  
Amortized Cost $ 4,000,000.0 [9],[33],[34],[35]             $ 4,000,000.0 [13],[28],[29],[36]            
Fair Value 9,000,000.0 [1],[9],[33],[34],[35]             9,000,000.0 [2],[13],[28],[29],[36]            
Investment, Identifier [Axis]: ATX Networks Corp, Common Stock                            
Fair Value $ 39,000,000.0             $ 29,200,000           0
Investment, Identifier [Axis]: ATX Networks Corp, Common Stock, Capital Goods                            
Principal (in shares) | shares 5,578 [9],[33],[34],[35],[37] 5,578 [9],[33],[34],[35],[37] 5,578 [9],[33],[34],[35],[37] 5,578 [9],[33],[34],[35],[37] 5,578 [9],[33],[34],[35],[37] 5,578 [9],[33],[34],[35],[37] 5,578 [9],[33],[34],[35],[37] 4,214 [13],[28],[29],[36],[38],[39] 4,214 [13],[28],[29],[36],[38],[39] 4,214 [13],[28],[29],[36],[38],[39] 4,214 [13],[28],[29],[36],[38],[39] 4,214 [13],[28],[29],[36],[38],[39] 4,214 [13],[28],[29],[36],[38],[39]  
Amortized Cost $ 9,900,000 [9],[33],[34],[35],[37]             $ 1,700,000 [13],[28],[29],[36],[38],[39]            
Fair Value $ 39,000,000.0 [1],[9],[33],[34],[35],[37]             $ 29,200,000 [2],[13],[28],[29],[36],[38],[39]            
Investment, Identifier [Axis]: AVF Parent LLC, Trade Claim, Retailing                            
Principal (in shares) | shares [13],[28]               44,507 44,507 44,507 44,507 44,507 44,507  
Amortized Cost [13],[28]               $ 0            
Fair Value [2],[13],[28]               $ 0            
Investment, Identifier [Axis]: Aareon AG, Software & Services                            
Rate, basis spread on variable rate [8],[20],[34] 10.25% 10.25% 10.25% 10.25% 10.25% 10.25% 10.25%              
Rate, PIK [8],[20],[34] 10.25% 10.25% 10.25% 10.25% 10.25% 10.25% 10.25%              
Floor [8],[20],[34] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%              
Principal Amount | € [15],[20],[34]   € 4.4                        
Amortized Cost [20],[34] $ 4,800,000                          
Fair Value [1],[20],[34] $ 4,600,000                          
Investment, Identifier [Axis]: Aareon AG, Software & Services 1                            
Rate, basis spread on variable rate [8],[9],[34] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%              
Floor [8],[9],[34] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%              
Principal Amount | € [9],[15],[34]   € 28.7                        
Amortized Cost [9],[34] $ 30,400,000                          
Fair Value [1],[9],[34] $ 29,600,000                          
Investment, Identifier [Axis]: Aareon AG, Software & Services 2                            
Rate, basis spread on variable rate [8],[20],[34] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%              
Floor [8],[20],[34] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%              
Principal Amount [15],[20],[34] $ 7,200,000                          
Amortized Cost [20],[34] 7,800,000                          
Fair Value [1],[20],[34] $ 7,400,000                          
Investment, Identifier [Axis]: Abaco Energy Technologies LLC, Common Stock, Energy                            
Principal (in shares) | shares 3,055,556 [9],[33] 3,055,556 [9],[33] 3,055,556 [9],[33] 3,055,556 [9],[33] 3,055,556 [9],[33] 3,055,556 [9],[33] 3,055,556 [9],[33] 3,055,556 [13],[28] 3,055,556 [13],[28] 3,055,556 [13],[28] 3,055,556 [13],[28] 3,055,556 [13],[28] 3,055,556 [13],[28]  
Amortized Cost $ 200,000 [9],[33]             $ 200,000 [13],[28]            
Fair Value $ 700,000 [1],[9],[33]             $ 500,000 [2],[13],[28]            
Investment, Identifier [Axis]: Abaco Energy Technologies LLC, Preferred Stock, Energy                            
Principal (in shares) | shares 12,734,481 [9],[33] 12,734,481 [9],[33] 12,734,481 [9],[33] 12,734,481 [9],[33] 12,734,481 [9],[33] 12,734,481 [9],[33] 12,734,481 [9],[33] 12,734,481 [13],[28] 12,734,481 [13],[28] 12,734,481 [13],[28] 12,734,481 [13],[28] 12,734,481 [13],[28] 12,734,481 [13],[28]  
Amortized Cost $ 1,500,000 [9],[33]             $ 1,500,000 [13],[28]            
Fair Value $ 4,900,000 [1],[9],[33]             $ 3,700,000 [2],[13],[28]            
Investment, Identifier [Axis]: Abacus JV, Private Equity, Insurance                            
Principal (in shares) | shares 47,045,141 [9],[15],[34] 47,045,141 [9],[15],[34] 47,045,141 [9],[15],[34] 47,045,141 [9],[15],[34] 47,045,141 [9],[15],[34] 47,045,141 [9],[15],[34] 47,045,141 [9],[15],[34] 49,223,047 [13],[16],[29] 49,223,047 [13],[16],[29] 49,223,047 [13],[16],[29] 49,223,047 [13],[16],[29] 49,223,047 [13],[16],[29] 49,223,047 [13],[16],[29]  
Amortized Cost $ 46,100,000 [9],[34]             $ 48,200,000 [13],[29]            
Fair Value $ 48,600,000 [1],[9],[34]             $ 53,300,000 [2],[13],[29]            
Investment, Identifier [Axis]: Accelerator Investments Aggregator LP, Private Equity, Diversified Financials                            
Principal (in shares) | shares [13],[16],[28],[29]               3,869,291 3,869,291 3,869,291 3,869,291 3,869,291 3,869,291  
Amortized Cost [13],[28],[29]               $ 4,500,000            
Fair Value [2],[13],[28],[29]               $ 3,400,000            
Investment, Identifier [Axis]: Accelerator Investments Aggregator LP, Private Equity, Financial Services                            
Principal (in shares) | shares [9],[15],[33],[34] 2,778,491 2,778,491 2,778,491 2,778,491 2,778,491 2,778,491 2,778,491              
Amortized Cost [9],[33],[34] $ 3,200,000                          
Fair Value [1],[9],[33],[34] $ 3,400,000                          
Investment, Identifier [Axis]: Accuride Corp, Capital Goods                            
Rate, basis spread on variable rate 5.25% [8],[18],[40] 5.25% [8],[18],[40] 5.25% [8],[18],[40] 5.25% [8],[18],[40] 5.25% [8],[18],[40] 5.25% [8],[18],[40] 5.25% [8],[18],[40] 5.25% [10],[12],[41] 5.25% [10],[12],[41] 5.25% [10],[12],[41] 5.25% [10],[12],[41] 5.25% [10],[12],[41] 5.25% [10],[12],[41]  
Rate, PIK [8],[18],[40] 1.60% 1.60% 1.60% 1.60% 1.60% 1.60% 1.60%              
Rate, Max PIK [8],[18],[40] 1.60% 1.60% 1.60% 1.60% 1.60% 1.60% 1.60%              
Floor 1.00% [8],[18],[40] 1.00% [8],[18],[40] 1.00% [8],[18],[40] 1.00% [8],[18],[40] 1.00% [8],[18],[40] 1.00% [8],[18],[40] 1.00% [8],[18],[40] 1.00% [12],[41] 1.00% [12],[41] 1.00% [12],[41] 1.00% [12],[41] 1.00% [12],[41] 1.00% [12],[41]  
Principal Amount $ 7,500,000 [15],[18],[40]             $ 8,900,000 [12],[16],[41]            
Amortized Cost 7,400,000 [18],[40]             8,400,000 [12],[41]            
Fair Value $ 6,600,000 [1],[18],[40]             $ 7,600,000 [2],[12],[41]            
Investment, Identifier [Axis]: Advanced Dermatology & Cosmetic Surgery, Health Care Equipment & Services 1                            
Rate, basis spread on variable rate 6.50% [8],[9] 6.50% [8],[9] 6.50% [8],[9] 6.50% [8],[9] 6.50% [8],[9] 6.50% [8],[9] 6.50% [8],[9] 6.50% [10],[13],[22],[42] 6.50% [10],[13],[22],[42] 6.50% [10],[13],[22],[42] 6.50% [10],[13],[22],[42] 6.50% [10],[13],[22],[42] 6.50% [10],[13],[22],[42]  
Floor 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [13],[22],[42] 1.00% [13],[22],[42] 1.00% [13],[22],[42] 1.00% [13],[22],[42] 1.00% [13],[22],[42] 1.00% [13],[22],[42]  
Principal Amount $ 600,000 [9],[15]             $ 46,300,000 [13],[16],[22],[42]            
Amortized Cost 600,000 [9]             44,700,000 [13],[22],[42]            
Fair Value $ 600,000 [1],[9]             $ 45,600,000 [2],[13],[22],[42]            
Investment, Identifier [Axis]: Advanced Dermatology & Cosmetic Surgery, Health Care Equipment & Services 2                            
Rate, basis spread on variable rate 6.50% [8],[9],[24],[43] 6.50% [8],[9],[24],[43] 6.50% [8],[9],[24],[43] 6.50% [8],[9],[24],[43] 6.50% [8],[9],[24],[43] 6.50% [8],[9],[24],[43] 6.50% [8],[9],[24],[43] 6.50% [10],[19] 6.50% [10],[19] 6.50% [10],[19] 6.50% [10],[19] 6.50% [10],[19] 6.50% [10],[19]  
Floor 1.00% [8],[9],[24],[43] 1.00% [8],[9],[24],[43] 1.00% [8],[9],[24],[43] 1.00% [8],[9],[24],[43] 1.00% [8],[9],[24],[43] 1.00% [8],[9],[24],[43] 1.00% [8],[9],[24],[43] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19]  
Principal Amount $ 38,200,000 [9],[15],[24],[43]             $ 2,200,000 [16],[19]            
Amortized Cost 36,800,000 [9],[24],[43]             2,200,000 [19]            
Fair Value $ 37,400,000 [1],[9],[24],[43]             $ 2,200,000 [2],[19]            
Investment, Identifier [Axis]: Advanced Dermatology & Cosmetic Surgery, Health Care Equipment & Services 3                            
Rate, basis spread on variable rate 6.50% [8],[9] 6.50% [8],[9] 6.50% [8],[9] 6.50% [8],[9] 6.50% [8],[9] 6.50% [8],[9] 6.50% [8],[9] 6.50% [10],[19] 6.50% [10],[19] 6.50% [10],[19] 6.50% [10],[19] 6.50% [10],[19] 6.50% [10],[19]  
Floor 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19]  
Principal Amount $ 7,800,000 [9],[15]             $ 3,600,000 [16],[19]            
Amortized Cost 7,800,000 [9]             3,600,000 [19]            
Fair Value $ 7,700,000 [1],[9]             $ 3,500,000 [2],[19]            
Investment, Identifier [Axis]: Advanced Dermatology & Cosmetic Surgery, Health Care Equipment & Services 4                            
Rate, basis spread on variable rate [8],[20] 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%              
Floor [8],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [15],[20] $ 2,900,000                          
Amortized Cost [20] 2,900,000                          
Fair Value [1],[20] $ 2,900,000                          
Investment, Identifier [Axis]: Advanced Lighting Technologies Inc, Materials                            
Rate, PIK [10]               16.00% 16.00% 16.00% 16.00% 16.00% 16.00%  
Rate, Max PIK [10],[13],[25],[28]               16.00% 16.00% 16.00% 16.00% 16.00% 16.00%  
Floor [13],[25],[28]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [13],[16],[25],[28]               $ 13,500,000            
Amortized Cost [13],[25],[28]               10,500,000            
Fair Value [2],[13],[25],[28]               $ 3,400,000            
Investment, Identifier [Axis]: Advania Sverige AB, Software & Services 1                            
Rate, basis spread on variable rate 6.10% [8],[9],[34] 6.10% [8],[9],[34] 6.10% [8],[9],[34] 6.10% [8],[9],[34] 6.10% [8],[9],[34] 6.10% [8],[9],[34] 6.10% [8],[9],[34] 6.10% [10],[13],[29] 6.10% [10],[13],[29] 6.10% [10],[13],[29] 6.10% [10],[13],[29] 6.10% [10],[13],[29] 6.10% [10],[13],[29]  
Rate, PIK 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [10],[13],[29] 0.00% [10],[13],[29] 0.00% [10],[13],[29] 0.00% [10],[13],[29] 0.00% [10],[13],[29] 0.00% [10],[13],[29]  
Rate, Max PIK 3.30% [8],[9],[34] 3.30% [8],[9],[34] 3.30% [8],[9],[34] 3.30% [8],[9],[34] 3.30% [8],[9],[34] 3.30% [8],[9],[34] 3.30% [8],[9],[34] 3.30% [10],[13],[29] 3.30% [10],[13],[29] 3.30% [10],[13],[29] 3.30% [10],[13],[29] 3.30% [10],[13],[29] 3.30% [10],[13],[29]  
Floor 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [13],[29] 0.00% [13],[29] 0.00% [13],[29] 0.00% [13],[29] 0.00% [13],[29] 0.00% [13],[29]  
Principal Amount | kr     kr 933.6 [9],[15],[34]             kr 933.6 [13],[16],[29]        
Amortized Cost $ 106,500,000 [9],[34]             $ 106,100,000 [13],[29]            
Fair Value $ 84,300,000 [1],[9],[34]             $ 86,000,000.0 [2],[13],[29]            
Investment, Identifier [Axis]: Advania Sverige AB, Software & Services 2                            
Rate, basis spread on variable rate 6.10% [8],[9],[34] 6.10% [8],[9],[34] 6.10% [8],[9],[34] 6.10% [8],[9],[34] 6.10% [8],[9],[34] 6.10% [8],[9],[34] 6.10% [8],[9],[34] 6.10% [10],[13],[29] 6.10% [10],[13],[29] 6.10% [10],[13],[29] 6.10% [10],[13],[29] 6.10% [10],[13],[29] 6.10% [10],[13],[29]  
Rate, PIK 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [10],[13],[29] 0.00% [10],[13],[29] 0.00% [10],[13],[29] 0.00% [10],[13],[29] 0.00% [10],[13],[29] 0.00% [10],[13],[29]  
Rate, Max PIK 3.30% [8],[9],[34] 3.30% [8],[9],[34] 3.30% [8],[9],[34] 3.30% [8],[9],[34] 3.30% [8],[9],[34] 3.30% [8],[9],[34] 3.30% [8],[9],[34] 3.30% [10],[13],[29] 3.30% [10],[13],[29] 3.30% [10],[13],[29] 3.30% [10],[13],[29] 3.30% [10],[13],[29] 3.30% [10],[13],[29]  
Floor 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [13],[29] 0.00% [13],[29] 0.00% [13],[29] 0.00% [13],[29] 0.00% [13],[29] 0.00% [13],[29]  
Principal Amount | kr       kr 1,345.8 [9],[15],[34]             kr 1,345.8 [13],[16],[29]      
Amortized Cost $ 10,200,000 [9],[34]             $ 10,100,000 [13],[29]            
Fair Value 9,600,000 [1],[9],[34]             9,200,000 [2],[13],[29]            
Investment, Identifier [Axis]: Affordable Care Inc                            
Fair Value               53,100,000           59,900,000
Investment, Identifier [Axis]: Affordable Care Inc 1                            
Fair Value 33,900,000             53,100,000            
Investment, Identifier [Axis]: Affordable Care Inc, 2                            
Fair Value $ 4,400,000             $ 0           0
Investment, Identifier [Axis]: Affordable Care Inc, Health Care Equipment & Services 1                            
Rate, basis spread on variable rate 5.50% [8],[9],[43],[44] 5.50% [8],[9],[43],[44] 5.50% [8],[9],[43],[44] 5.50% [8],[9],[43],[44] 5.50% [8],[9],[43],[44] 5.50% [8],[9],[43],[44] 5.50% [8],[9],[43],[44] 5.50% [10],[13],[42],[45] 5.50% [10],[13],[42],[45] 5.50% [10],[13],[42],[45] 5.50% [10],[13],[42],[45] 5.50% [10],[13],[42],[45] 5.50% [10],[13],[42],[45]  
Rate, PIK [10],[13],[42],[45]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%  
Rate, Max PIK [10],[13],[42],[45]               1.30% 1.30% 1.30% 1.30% 1.30% 1.30%  
Floor 0.80% [8],[9],[43],[44] 0.80% [8],[9],[43],[44] 0.80% [8],[9],[43],[44] 0.80% [8],[9],[43],[44] 0.80% [8],[9],[43],[44] 0.80% [8],[9],[43],[44] 0.80% [8],[9],[43],[44] 0.80% [13],[42],[45] 0.80% [13],[42],[45] 0.80% [13],[42],[45] 0.80% [13],[42],[45] 0.80% [13],[42],[45] 0.80% [13],[42],[45]  
Principal Amount $ 13,700,000 [9],[15],[43],[44]             $ 53,600,000 [13],[16],[42],[45]            
Amortized Cost 13,600,000 [9],[43],[44]             53,300,000 [13],[42],[45]            
Fair Value $ 13,600,000 [1],[9],[43],[44]             $ 52,500,000 [2],[13],[42],[45]            
Investment, Identifier [Axis]: Affordable Care Inc, Health Care Equipment & Services 2                            
Rate, basis spread on variable rate 5.50% [8],[9],[44] 5.50% [8],[9],[44] 5.50% [8],[9],[44] 5.50% [8],[9],[44] 5.50% [8],[9],[44] 5.50% [8],[9],[44] 5.50% [8],[9],[44] 5.50% [10],[13],[45] 5.50% [10],[13],[45] 5.50% [10],[13],[45] 5.50% [10],[13],[45] 5.50% [10],[13],[45] 5.50% [10],[13],[45]  
Rate, PIK [10],[13],[45]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%  
Rate, Max PIK [10],[13],[45]               1.30% 1.30% 1.30% 1.30% 1.30% 1.30%  
Floor 0.80% [8],[9],[44] 0.80% [8],[9],[44] 0.80% [8],[9],[44] 0.80% [8],[9],[44] 0.80% [8],[9],[44] 0.80% [8],[9],[44] 0.80% [8],[9],[44] 0.80% [13],[45] 0.80% [13],[45] 0.80% [13],[45] 0.80% [13],[45] 0.80% [13],[45] 0.80% [13],[45]  
Principal Amount $ 20,600,000 [9],[15],[44]             $ 1,400,000 [13],[16],[45]            
Amortized Cost 20,600,000 [9],[44]             1,400,000 [13],[45]            
Fair Value $ 20,400,000 [1],[9],[44]             $ 1,400,000 [2],[13],[45]            
Investment, Identifier [Axis]: Affordable Care Inc, Health Care Equipment & Services 3                            
Rate, basis spread on variable rate 5.50% [8],[9] 5.50% [8],[9] 5.50% [8],[9] 5.50% [8],[9] 5.50% [8],[9] 5.50% [8],[9] 5.50% [8],[9] 5.50% [10],[19],[45] 5.50% [10],[19],[45] 5.50% [10],[19],[45] 5.50% [10],[19],[45] 5.50% [10],[19],[45] 5.50% [10],[19],[45]  
Rate, PIK [10],[19],[45]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%  
Rate, Max PIK [10],[19],[45]               1.30% 1.30% 1.30% 1.30% 1.30% 1.30%  
Floor 0.70% [8],[9],[44] 0.70% [8],[9],[44] 0.70% [8],[9],[44] 0.70% [8],[9],[44] 0.70% [8],[9],[44] 0.70% [8],[9],[44] 0.70% [8],[9],[44] 0.80% [19],[45] 0.80% [19],[45] 0.80% [19],[45] 0.80% [19],[45] 0.80% [19],[45] 0.80% [19],[45]  
Principal Amount $ 4,700,000 [9],[15],[44]             $ 28,400,000 [16],[19],[45]            
Amortized Cost 4,700,000 [9],[44]             28,400,000 [19],[45]            
Fair Value $ 4,600,000 [1],[9],[44]             $ 27,800,000 [2],[19],[45]            
Investment, Identifier [Axis]: Affordable Care Inc, Health Care Equipment & Services 4                            
Rate, basis spread on variable rate 5.50% [8],[20],[44] 5.50% [8],[20],[44] 5.50% [8],[20],[44] 5.50% [8],[20],[44] 5.50% [8],[20],[44] 5.50% [8],[20],[44] 5.50% [8],[20],[44] 5.50% [10],[19],[45] 5.50% [10],[19],[45] 5.50% [10],[19],[45] 5.50% [10],[19],[45] 5.50% [10],[19],[45] 5.50% [10],[19],[45]  
Rate, PIK 0.00% [8],[20],[44] 0.00% [8],[20],[44] 0.00% [8],[20],[44] 0.00% [8],[20],[44] 0.00% [8],[20],[44] 0.00% [8],[20],[44] 0.00% [8],[20],[44] 0.00% [10],[19],[45] 0.00% [10],[19],[45] 0.00% [10],[19],[45] 0.00% [10],[19],[45] 0.00% [10],[19],[45] 0.00% [10],[19],[45]  
Rate, Max PIK 1.30% [8],[20],[44] 1.30% [8],[20],[44] 1.30% [8],[20],[44] 1.30% [8],[20],[44] 1.30% [8],[20],[44] 1.30% [8],[20],[44] 1.30% [8],[20],[44] 1.30% [10],[19],[45] 1.30% [10],[19],[45] 1.30% [10],[19],[45] 1.30% [10],[19],[45] 1.30% [10],[19],[45] 1.30% [10],[19],[45]  
Floor 0.80% [8],[20],[44] 0.80% [8],[20],[44] 0.80% [8],[20],[44] 0.80% [8],[20],[44] 0.80% [8],[20],[44] 0.80% [8],[20],[44] 0.80% [8],[20],[44] 0.80% [19],[45] 0.80% [19],[45] 0.80% [19],[45] 0.80% [19],[45] 0.80% [19],[45] 0.80% [19],[45]  
Principal Amount $ 12,800,000 [15],[20],[44]             $ 11,400,000 [16],[19],[45]            
Amortized Cost 12,800,000 [20],[44]             11,400,000 [19],[45]            
Fair Value $ 12,700,000 [1],[20],[44]             11,200,000 [2],[19],[45]            
Investment, Identifier [Axis]: Affordable Care Inc, Health Care Equipment & Services 5                            
Rate, basis spread on variable rate [8],[20] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%              
Floor [8],[20],[44] 0.70% 0.70% 0.70% 0.70% 0.70% 0.70% 0.70%              
Principal Amount [15],[20],[44] $ 18,100,000                          
Amortized Cost [20],[44] 18,100,000                          
Fair Value [1],[20],[44] 17,900,000                          
Investment, Identifier [Axis]: Affordable Care Inc, Preferred Stock                            
Fair Value $ 48,500,000             $ 49,900,000            
Investment, Identifier [Axis]: Affordable Care Inc, Preferred Stock, Health Care Equipment & Services                            
Rate, PIK 11.80% [8],[9],[44] 11.80% [8],[9],[44] 11.80% [8],[9],[44] 11.80% [8],[9],[44] 11.80% [8],[9],[44] 11.80% [8],[9],[44] 11.80% [8],[9],[44] 11.80% [10],[13],[45] 11.80% [10],[13],[45] 11.80% [10],[13],[45] 11.80% [10],[13],[45] 11.80% [10],[13],[45] 11.80% [10],[13],[45]  
Rate, Max PIK 11.80% [8],[9],[44] 11.80% [8],[9],[44] 11.80% [8],[9],[44] 11.80% [8],[9],[44] 11.80% [8],[9],[44] 11.80% [8],[9],[44] 11.80% [8],[9],[44] 11.80% [10],[13],[45] 11.80% [10],[13],[45] 11.80% [10],[13],[45] 11.80% [10],[13],[45] 11.80% [10],[13],[45] 11.80% [10],[13],[45]  
Principal (in shares) | shares 49,073,000 [9],[44] 49,073,000 [9],[44] 49,073,000 [9],[44] 49,073,000 [9],[44] 49,073,000 [9],[44] 49,073,000 [9],[44] 49,073,000 [9],[44] 49,073,000 [13],[45] 49,073,000 [13],[45] 49,073,000 [13],[45] 49,073,000 [13],[45] 49,073,000 [13],[45] 49,073,000 [13],[45]  
Amortized Cost $ 48,100,000 [9],[44]             $ 48,100,000 [13],[45]            
Fair Value $ 48,500,000 [1],[9],[44]             $ 49,900,000 [2],[13],[45]            
Investment, Identifier [Axis]: Alacrity Solutions Group LLC, Insurance 1                            
Rate, basis spread on variable rate 5.25% [8],[9] 5.25% [8],[9] 5.25% [8],[9] 5.25% [8],[9] 5.25% [8],[9] 5.25% [8],[9] 5.25% [8],[9] 5.25% [10],[13] 5.25% [10],[13] 5.25% [10],[13] 5.25% [10],[13] 5.25% [10],[13] 5.25% [10],[13]  
Floor 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13]  
Principal Amount $ 5,900,000 [9],[15]             $ 28,400,000 [13],[16]            
Amortized Cost 5,800,000 [9]             28,000,000.0 [13]            
Fair Value $ 5,800,000 [1],[9]             $ 27,300,000 [2],[13]            
Investment, Identifier [Axis]: Alacrity Solutions Group LLC, Insurance 2                            
Rate, basis spread on variable rate 5.25% [8],[43] 5.25% [8],[43] 5.25% [8],[43] 5.25% [8],[43] 5.25% [8],[43] 5.25% [8],[43] 5.25% [8],[43] 5.25% [10],[19] 5.25% [10],[19] 5.25% [10],[19] 5.25% [10],[19] 5.25% [10],[19] 5.25% [10],[19]  
Floor 0.80% [8],[43] 0.80% [8],[43] 0.80% [8],[43] 0.80% [8],[43] 0.80% [8],[43] 0.80% [8],[43] 0.80% [8],[43] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19]  
Principal Amount $ 11,900,000 [15],[43]             $ 10,800,000 [16],[19]            
Amortized Cost 11,800,000 [43]             10,600,000 [19]            
Fair Value $ 11,700,000 [1],[43]             $ 10,400,000 [2],[19]            
Investment, Identifier [Axis]: Alacrity Solutions Group LLC, Insurance 3                            
Rate, basis spread on variable rate [8],[20] 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%              
Floor [8],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%              
Principal Amount [15],[20] $ 4,900,000                          
Amortized Cost [20] 4,900,000                          
Fair Value [1],[20] $ 4,800,000                          
Investment, Identifier [Axis]: Alera Group Intermediate Holdings Inc , Insurance 1                            
Rate, basis spread on variable rate [8],[43] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%              
Floor [8],[43] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%              
Principal Amount [15],[43] $ 9,100,000                          
Amortized Cost [43] 9,100,000                          
Fair Value [1],[43] $ 9,100,000                          
Investment, Identifier [Axis]: Alera Group Intermediate Holdings Inc , Insurance 2                            
Rate, basis spread on variable rate [8],[9],[43] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%              
Floor [8],[9],[43] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%              
Principal Amount [9],[15],[43] $ 22,400,000                          
Amortized Cost [9],[43] 22,400,000                          
Fair Value [1],[9],[43] $ 22,200,000                          
Investment, Identifier [Axis]: Alera Group Intermediate Holdings Inc, Insurance 1                            
Rate, basis spread on variable rate [10],[42]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Floor [42]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%  
Principal Amount [16],[42]               $ 9,200,000            
Amortized Cost [42]               9,100,000            
Fair Value [2],[42]               $ 8,700,000            
Investment, Identifier [Axis]: Alera Group Intermediate Holdings Inc, Insurance 2                            
Rate, basis spread on variable rate [10],[13],[42]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Floor [13],[42]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%  
Principal Amount [13],[16],[42]               $ 22,500,000            
Amortized Cost [13],[42]               22,500,000            
Fair Value [2],[13],[42]               $ 21,400,000            
Investment, Identifier [Axis]: Altavair AirFinance, Private Equity, Capital Goods                            
Principal (in shares) | shares 128,878,615 [9],[15],[34] 128,878,615 [9],[15],[34] 128,878,615 [9],[15],[34] 128,878,615 [9],[15],[34] 128,878,615 [9],[15],[34] 128,878,615 [9],[15],[34] 128,878,615 [9],[15],[34] 140,212,883 [13],[16],[29] 140,212,883 [13],[16],[29] 140,212,883 [13],[16],[29] 140,212,883 [13],[16],[29] 140,212,883 [13],[16],[29] 140,212,883 [13],[16],[29]  
Amortized Cost $ 129,900,000 [9],[34]             $ 141,100,000 [13],[29]            
Fair Value $ 133,200,000 [1],[9],[34]             $ 162,100,000 [2],[13],[29]            
Investment, Identifier [Axis]: Altitude II IRL WH Borrower DAC, Revolver, Capital Goods 1                            
Rate, basis spread on variable rate [8],[9],[34] 10.00% 10.00% 10.00% 10.00% 10.00% 10.00% 10.00%              
Floor [8],[9],[34] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%              
Principal Amount [9],[15],[34] $ 4,900,000                          
Amortized Cost [9],[34] 4,900,000                          
Fair Value [1],[9],[34] $ 4,900,000                          
Investment, Identifier [Axis]: Altitude II IRL WH Borrower DAC, Revolver, Capital Goods 2                            
Rate, basis spread on variable rate [8],[20],[34] 10.00% 10.00% 10.00% 10.00% 10.00% 10.00% 10.00%              
Floor [8],[20],[34] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%              
Principal Amount [15],[20],[34] $ 4,900,000                          
Amortized Cost [20],[34] 4,900,000                          
Fair Value [1],[20],[34] $ 4,900,000                          
Investment, Identifier [Axis]: American Vision Partners, Health Care Equipment & Services 1                            
Rate, basis spread on variable rate 5.75% [8],[9] 5.75% [8],[9] 5.75% [8],[9] 5.75% [8],[9] 5.75% [8],[9] 5.75% [8],[9] 5.75% [8],[9] 5.75% [10],[13],[14] 5.75% [10],[13],[14] 5.75% [10],[13],[14] 5.75% [10],[13],[14] 5.75% [10],[13],[14] 5.75% [10],[13],[14]  
Floor 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [13],[14] 0.80% [13],[14] 0.80% [13],[14] 0.80% [13],[14] 0.80% [13],[14] 0.80% [13],[14]  
Principal Amount $ 2,800,000 [9],[15]             $ 113,000,000.0 [13],[14],[16]            
Amortized Cost 2,800,000 [9]             112,500,000 [13],[14]            
Fair Value $ 2,700,000 [1],[9]             $ 109,100,000 [2],[13],[14]            
Investment, Identifier [Axis]: American Vision Partners, Health Care Equipment & Services 2                            
Rate, basis spread on variable rate 5.75% [8],[9],[17] 5.75% [8],[9],[17] 5.75% [8],[9],[17] 5.75% [8],[9],[17] 5.75% [8],[9],[17] 5.75% [8],[9],[17] 5.75% [8],[9],[17] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19]  
Floor 0.80% [8],[9],[17] 0.80% [8],[9],[17] 0.80% [8],[9],[17] 0.80% [8],[9],[17] 0.80% [8],[9],[17] 0.80% [8],[9],[17] 0.80% [8],[9],[17] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19]  
Principal Amount $ 91,600,000 [9],[15],[17]             $ 7,800,000 [16],[19]            
Amortized Cost 91,200,000 [9],[17]             7,800,000 [19]            
Fair Value $ 88,900,000 [1],[9],[17]             $ 7,500,000 [2],[19]            
Investment, Identifier [Axis]: American Vision Partners, Health Care Equipment & Services 3                            
Rate, basis spread on variable rate [8],[20] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%              
Floor [8],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%              
Principal Amount [15],[20] $ 5,000,000.0                          
Amortized Cost [20] 5,000,000.0                          
Fair Value [1],[20] $ 4,800,000                          
Investment, Identifier [Axis]: American Vision Partners, Private Equity, Health Care Equipment & Services                            
Principal (in shares) | shares 2,655,491 [9],[33] 2,655,491 [9],[33] 2,655,491 [9],[33] 2,655,491 [9],[33] 2,655,491 [9],[33] 2,655,491 [9],[33] 2,655,491 [9],[33] 2,655,491 [13],[28] 2,655,491 [13],[28] 2,655,491 [13],[28] 2,655,491 [13],[28] 2,655,491 [13],[28] 2,655,491 [13],[28]  
Amortized Cost $ 2,700,000 [9],[33]             $ 2,700,000 [13],[28]            
Fair Value $ 2,000,000.0 [1],[9],[33]             $ 2,200,000 [2],[13],[28]            
Investment, Identifier [Axis]: Amerivet Partners Management Inc, Health Care Equipment & Services 1                            
Rate, basis spread on variable rate 5.50% [8],[9] 5.50% [8],[9] 5.50% [8],[9] 5.50% [8],[9] 5.50% [8],[9] 5.50% [8],[9] 5.50% [8],[9] 5.50% [10],[13] 5.50% [10],[13] 5.50% [10],[13] 5.50% [10],[13] 5.50% [10],[13] 5.50% [10],[13]  
Floor 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13]  
Principal Amount $ 78,800,000 [9],[15]             $ 95,400,000 [13],[16]            
Amortized Cost 78,500,000 [9]             94,500,000 [13]            
Fair Value $ 76,500,000 [1],[9]             $ 91,800,000 [2],[13]            
Investment, Identifier [Axis]: Amerivet Partners Management Inc, Health Care Equipment & Services 2                            
Rate, basis spread on variable rate 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [10],[13] 5.50% [10],[13] 5.50% [10],[13] 5.50% [10],[13] 5.50% [10],[13] 5.50% [10],[13]  
Floor 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13]  
Principal Amount $ 8,400,000 [15],[20]             $ 17,200,000 [13],[16]            
Amortized Cost 8,400,000 [20]             17,200,000 [13]            
Fair Value $ 8,200,000 [1],[20]             $ 16,600,000 [2],[13]            
Investment, Identifier [Axis]: Amerivet Partners Management Inc, Health Care Equipment & Services 3                            
Rate, basis spread on variable rate 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [10],[19] 5.50% [10],[19] 5.50% [10],[19] 5.50% [10],[19] 5.50% [10],[19] 5.50% [10],[19]  
Floor 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19]  
Principal Amount $ 37,400,000 [15],[20]             $ 8,400,000 [16],[19]            
Amortized Cost 37,400,000 [20]             8,400,000 [19]            
Fair Value $ 36,300,000 [1],[20]             $ 8,100,000 [2],[19]            
Investment, Identifier [Axis]: Amerivet Partners Management Inc, Health Care Equipment & Services 4                            
Rate, basis spread on variable rate [10],[19]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%  
Floor [19]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%  
Principal Amount [16],[19]               $ 50,100,000            
Amortized Cost [19]               50,100,000            
Fair Value [2],[19]               $ 48,200,000            
Investment, Identifier [Axis]: Amerivet Partners Management Inc, Preferred Stock, Health Care Equipment & Services                            
Rate, PIK 11.50% [8],[9] 11.50% [8],[9] 11.50% [8],[9] 11.50% [8],[9] 11.50% [8],[9] 11.50% [8],[9] 11.50% [8],[9] 11.50% [10],[13] 11.50% [10],[13] 11.50% [10],[13] 11.50% [10],[13] 11.50% [10],[13] 11.50% [10],[13]  
Rate, Max PIK 11.50% [8],[9] 11.50% [8],[9] 11.50% [8],[9] 11.50% [8],[9] 11.50% [8],[9] 11.50% [8],[9] 11.50% [8],[9] 11.50% [10],[13] 11.50% [10],[13] 11.50% [10],[13] 11.50% [10],[13] 11.50% [10],[13] 11.50% [10],[13]  
Principal (in shares) | shares 12,702,290 [9] 12,702,290 [9] 12,702,290 [9] 12,702,290 [9] 12,702,290 [9] 12,702,290 [9] 12,702,290 [9] 12,702,290 [13] 12,702,290 [13] 12,702,290 [13] 12,702,290 [13] 12,702,290 [13] 12,702,290 [13]  
Amortized Cost $ 12,300,000 [9]             $ 12,300,000 [13]            
Fair Value 11,800,000 [1],[9]             $ 11,800,000 [2],[13]            
Investment, Identifier [Axis]: Ammeraal Beltech Holding BV, Capital Goods                            
Rate, basis spread on variable rate [10],[13],[21],[29],[38]               7.75% 7.75% 7.75% 7.75% 7.75% 7.75%  
Floor [13],[21],[29],[38]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%  
Principal Amount [13],[16],[21],[29],[38]               $ 23,600,000            
Amortized Cost [13],[21],[29],[38]               21,800,000            
Fair Value [2],[13],[21],[29],[38]               23,000,000.0            
Investment, Identifier [Axis]: Amtek Global Technology Pte Ltd 1                            
Fair Value               3,900,000           34,800,000
Investment, Identifier [Axis]: Amtek Global Technology Pte Ltd 2                            
Fair Value               0           0
Investment, Identifier [Axis]: Amtek Global Technology Pte Ltd, Common Stock                            
Fair Value 0             $ 0           0
Investment, Identifier [Axis]: Amtek Global Technology Pte Ltd, Common Stock, Automobiles & Components                            
Principal (in shares) | shares [13],[28],[29],[36],[46]               7,046,126 7,046,126 7,046,126 7,046,126 7,046,126 7,046,126  
Amortized Cost [13],[28],[29],[36],[46]               $ 0            
Fair Value [2],[13],[28],[29],[36],[46]               0            
Investment, Identifier [Axis]: Amtek Global Technology Pte Ltd, Ordinary Shares                            
Fair Value 0             $ 0           0
Investment, Identifier [Axis]: Amtek Global Technology Pte Ltd, Ordinary Shares, Automobiles & Components                            
Principal (in shares) | shares [13],[28],[29],[36]               5,735,804,056 5,735,804,056 5,735,804,056 5,735,804,056 5,735,804,056 5,735,804,056  
Amortized Cost [13],[28],[29],[36]               $ 30,700,000            
Fair Value [2],[13],[28],[29],[36]               0            
Investment, Identifier [Axis]: Amtek Global Technology Pte Ltd, Private Equity                            
Fair Value $ 0             $ 0           0
Investment, Identifier [Axis]: Amtek Global Technology Pte Ltd, Private Equity, Automobiles & Components                            
Principal (in shares) | shares [13],[28],[29],[36]               4,097 4,097 4,097 4,097 4,097 4,097  
Amortized Cost [13],[28],[29],[36]               $ 0            
Fair Value [2],[13],[28],[29],[36]               $ 0            
Investment, Identifier [Axis]: Angelica Corp, Health Care Equipment & Services                            
Rate, PIK 10.00% [8],[30],[33],[47] 10.00% [8],[30],[33],[47] 10.00% [8],[30],[33],[47] 10.00% [8],[30],[33],[47] 10.00% [8],[30],[33],[47] 10.00% [8],[30],[33],[47] 10.00% [8],[30],[33],[47] 10.00% [10],[25],[28],[48] 10.00% [10],[25],[28],[48] 10.00% [10],[25],[28],[48] 10.00% [10],[25],[28],[48] 10.00% [10],[25],[28],[48] 10.00% [10],[25],[28],[48]  
Rate, Max PIK 10.00% [8],[30],[33],[47] 10.00% [8],[30],[33],[47] 10.00% [8],[30],[33],[47] 10.00% [8],[30],[33],[47] 10.00% [8],[30],[33],[47] 10.00% [8],[30],[33],[47] 10.00% [8],[30],[33],[47] 10.00% [10],[25],[28],[48] 10.00% [10],[25],[28],[48] 10.00% [10],[25],[28],[48] 10.00% [10],[25],[28],[48] 10.00% [10],[25],[28],[48] 10.00% [10],[25],[28],[48]  
Principal Amount $ 61,900,000 [15],[30],[33],[47]             $ 59,000,000.0 [16],[25],[28],[48]            
Amortized Cost 2,700,000 [30],[33],[47]             42,300,000 [25],[28],[48]            
Fair Value $ 900,000 [1],[30],[33],[47]             $ 900,000 [2],[25],[28],[48]            
Investment, Identifier [Axis]: Angelica Corp, Limited Partnership Interest, Health Care Equipment & Services                            
Principal (in shares) | shares [28],[48]               877,044 877,044 877,044 877,044 877,044 877,044  
Amortized Cost [28],[48]               $ 47,600,000            
Fair Value [2],[28],[48]               $ 0            
Investment, Identifier [Axis]: Apex Group Limited, Diversified Financials                            
Rate, basis spread on variable rate [10],[13],[29]               6.75% 6.75% 6.75% 6.75% 6.75% 6.75%  
Floor [13],[29]               0.50% 0.50% 0.50% 0.50% 0.50% 0.50%  
Principal Amount [13],[16],[29]               $ 55,000,000.0            
Amortized Cost [13],[29]               54,000,000.0            
Fair Value [2],[13],[29]               $ 51,700,000            
Investment, Identifier [Axis]: Apex Group Limited, Diversified Financials 1                            
Rate, basis spread on variable rate [10],[13],[29],[41]               3.75% 3.75% 3.75% 3.75% 3.75% 3.75%  
Floor [13],[29],[41]               0.50% 0.50% 0.50% 0.50% 0.50% 0.50%  
Principal Amount [13],[16],[29],[41]               $ 2,500,000            
Amortized Cost [13],[29],[41]               2,500,000            
Fair Value [2],[13],[29],[41]               $ 2,400,000            
Investment, Identifier [Axis]: Apex Group Limited, Diversified Financials 2                            
Rate, basis spread on variable rate [10],[13],[29],[41]               4.00% 4.00% 4.00% 4.00% 4.00% 4.00%  
Floor [13],[29],[41]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%  
Principal Amount | € [13],[16],[29],[41]                 € 2.0          
Amortized Cost [13],[29],[41]               $ 2,300,000            
Fair Value [2],[13],[29],[41]               $ 2,000,000.0            
Investment, Identifier [Axis]: Apex Group Limited, Financial Services                            
Rate, basis spread on variable rate [8],[9],[34] 6.75% 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%              
Floor [8],[9],[34] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%              
Principal Amount [9],[15],[34] $ 55,000,000.0                          
Amortized Cost [9],[34] 54,100,000                          
Fair Value [1],[9],[34] $ 53,500,000                          
Investment, Identifier [Axis]: Apex Group Limited, Financial Services 1                            
Rate, basis spread on variable rate [8],[34],[40],[43] 3.75% 3.75% 3.75% 3.75% 3.75% 3.75% 3.75%              
Floor [8],[34],[40],[43] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%              
Principal Amount [15],[34],[40],[43] $ 2,500,000                          
Amortized Cost [34],[40],[43] 2,400,000                          
Fair Value [1],[34],[40],[43] $ 2,500,000                          
Investment, Identifier [Axis]: Apex Group Limited, Financial Services 2                            
Rate, basis spread on variable rate [8],[9],[34],[40] 4.00% 4.00% 4.00% 4.00% 4.00% 4.00% 4.00%              
Floor [8],[9],[34],[40] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%              
Principal Amount | € [9],[15],[34],[40]   € 2.0                        
Amortized Cost [9],[34],[40] $ 2,300,000                          
Fair Value [1],[9],[34],[40] $ 2,100,000                          
Investment, Identifier [Axis]: Arcfield Acquisition Corp, Capital Goods                            
Rate, basis spread on variable rate [8],[17],[24] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%              
Floor [8],[17],[24] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%              
Principal Amount [15],[17],[24] $ 40,100,000                          
Amortized Cost [17],[24] 39,800,000                          
Fair Value [1],[17],[24] $ 40,100,000                          
Investment, Identifier [Axis]: Arcfield Acquisition Corp, Capital Goods 1                            
Rate, basis spread on variable rate [10],[14],[22]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%  
Floor [14],[22]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%  
Principal Amount [14],[16],[22]               $ 40,300,000            
Amortized Cost [14],[22]               39,900,000            
Fair Value [2],[14],[22]               $ 39,400,000            
Investment, Identifier [Axis]: Arcfield Acquisition Corp, Capital Goods 2                            
Rate, basis spread on variable rate 6.25% [8],[9] 6.25% [8],[9] 6.25% [8],[9] 6.25% [8],[9] 6.25% [8],[9] 6.25% [8],[9] 6.25% [8],[9] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19]  
Floor 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19]  
Principal Amount $ 38,400,000 [9],[15]             $ 7,100,000 [16],[19]            
Amortized Cost 38,400,000 [9]             7,100,000 [19]            
Fair Value $ 38,400,000 [1],[9]             $ 6,900,000 [2],[19]            
Investment, Identifier [Axis]: Arcfield Acquisition Corp, Capital Goods 3                            
Rate, basis spread on variable rate [8],[20] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%              
Floor [8],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%              
Principal Amount [15],[20] $ 7,100,000                          
Amortized Cost [20] 7,100,000                          
Fair Value [1],[20] $ 7,100,000                          
Investment, Identifier [Axis]: Arcfield Acquisition Corp, Capital Goods 4                            
Rate, basis spread on variable rate [8],[20] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%              
Floor [8],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%              
Principal Amount [15],[20] $ 3,500,000                          
Amortized Cost [20] 3,500,000                          
Fair Value [1],[20] $ 3,500,000                          
Investment, Identifier [Axis]: Arcos LLC/VA, Preferred Stock, Software & Services                            
Rate, PIK 9.50% [8],[9] 9.50% [8],[9] 9.50% [8],[9] 9.50% [8],[9] 9.50% [8],[9] 9.50% [8],[9] 9.50% [8],[9] 9.50% [10],[13] 9.50% [10],[13] 9.50% [10],[13] 9.50% [10],[13] 9.50% [10],[13] 9.50% [10],[13]  
Rate, Max PIK 9.50% [8],[9] 9.50% [8],[9] 9.50% [8],[9] 9.50% [8],[9] 9.50% [8],[9] 9.50% [8],[9] 9.50% [8],[9] 9.50% [10],[13] 9.50% [10],[13] 9.50% [10],[13] 9.50% [10],[13] 9.50% [10],[13] 9.50% [10],[13]  
Floor 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13]  
Principal (in shares) | shares 15,000,000 [9] 15,000,000 [9] 15,000,000 [9] 15,000,000 [9] 15,000,000 [9] 15,000,000 [9] 15,000,000 [9] 15,000,000 [13] 15,000,000 [13] 15,000,000 [13] 15,000,000 [13] 15,000,000 [13] 15,000,000 [13]  
Amortized Cost $ 14,100,000 [9]             $ 14,000,000.0 [13]            
Fair Value $ 13,200,000 [1],[9]             $ 13,400,000 [2],[13]            
Investment, Identifier [Axis]: Arcos LLC/VA, Software & Services 1                            
Rate, basis spread on variable rate 3.00% [8],[43] 3.00% [8],[43] 3.00% [8],[43] 3.00% [8],[43] 3.00% [8],[43] 3.00% [8],[43] 3.00% [8],[43] 5.75% [10],[42] 5.75% [10],[42] 5.75% [10],[42] 5.75% [10],[42] 5.75% [10],[42] 5.75% [10],[42]  
Rate, PIK [8],[43] 3.30% 3.30% 3.30% 3.30% 3.30% 3.30% 3.30%              
Rate, Max PIK [8],[43] 3.30% 3.30% 3.30% 3.30% 3.30% 3.30% 3.30%              
Floor 1.00% [8],[43] 1.00% [8],[43] 1.00% [8],[43] 1.00% [8],[43] 1.00% [8],[43] 1.00% [8],[43] 1.00% [8],[43] 1.00% [42] 1.00% [42] 1.00% [42] 1.00% [42] 1.00% [42] 1.00% [42]  
Principal Amount $ 12,400,000 [15],[43]             $ 12,300,000 [16],[42]            
Amortized Cost 12,200,000 [43]             12,200,000 [42]            
Fair Value $ 11,400,000 [1],[43]             $ 11,400,000 [2],[42]            
Investment, Identifier [Axis]: Arcos LLC/VA, Software & Services 2                            
Rate, basis spread on variable rate 6.25% [8],[20] 6.25% [8],[20] 6.25% [8],[20] 6.25% [8],[20] 6.25% [8],[20] 6.25% [8],[20] 6.25% [8],[20] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19]  
Floor 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19]  
Principal Amount $ 4,500,000 [15],[20]             $ 4,500,000 [16],[19]            
Amortized Cost 4,500,000 [20]             4,500,000 [19]            
Fair Value $ 4,100,000 [1],[20]             $ 4,200,000 [2],[19]            
Investment, Identifier [Axis]: Ardonagh Group Ltd, Insurance                            
Rate, PIK [8],[9],[34],[40] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%              
Rate, Max PIK [8],[9],[34],[40] 12.80% 12.80% 12.80% 12.80% 12.80% 12.80% 12.80%              
Rate, stated interest rate [8],[9],[34],[40] 11.50% 11.50% 11.50% 11.50% 11.50% 11.50% 11.50%              
Principal Amount [9],[15],[34],[40] $ 1,000,000.0                          
Amortized Cost [9],[34],[40] 1,000,000.0                          
Fair Value [1],[9],[34],[40] $ 1,000,000.0                          
Investment, Identifier [Axis]: Ardonagh Group Ltd, Insurance 1                            
Rate, basis spread on variable rate 7.00% [8],[9],[34] 7.00% [8],[9],[34] 7.00% [8],[9],[34] 7.00% [8],[9],[34] 7.00% [8],[9],[34] 7.00% [8],[9],[34] 7.00% [8],[9],[34] 7.00% [10],[13],[29] 7.00% [10],[13],[29] 7.00% [10],[13],[29] 7.00% [10],[13],[29] 7.00% [10],[13],[29] 7.00% [10],[13],[29]  
Floor 0.80% [8],[9],[34] 0.80% [8],[9],[34] 0.80% [8],[9],[34] 0.80% [8],[9],[34] 0.80% [8],[9],[34] 0.80% [8],[9],[34] 0.80% [8],[9],[34] 0.80% [13],[29] 0.80% [13],[29] 0.80% [13],[29] 0.80% [13],[29] 0.80% [13],[29] 0.80% [13],[29]  
Principal Amount | £         £ 0.8 [9],[15],[34]             £ 0.8 [13],[16],[29]    
Amortized Cost $ 1,000,000.0 [9],[34]             $ 1,000,000.0 [13],[29]            
Fair Value $ 1,000,000.0 [1],[9],[34]             $ 900,000 [2],[13],[29]            
Investment, Identifier [Axis]: Ardonagh Group Ltd, Insurance 2                            
Rate, basis spread on variable rate 6.75% [8],[9],[34] 6.75% [8],[9],[34] 6.75% [8],[9],[34] 6.75% [8],[9],[34] 6.75% [8],[9],[34] 6.75% [8],[9],[34] 6.75% [8],[9],[34] 7.00% [10],[13],[29] 7.00% [10],[13],[29] 7.00% [10],[13],[29] 7.00% [10],[13],[29] 7.00% [10],[13],[29] 7.00% [10],[13],[29]  
Floor 1.00% [8],[9],[34] 1.00% [8],[9],[34] 1.00% [8],[9],[34] 1.00% [8],[9],[34] 1.00% [8],[9],[34] 1.00% [8],[9],[34] 1.00% [8],[9],[34] 1.00% [13],[29] 1.00% [13],[29] 1.00% [13],[29] 1.00% [13],[29] 1.00% [13],[29] 1.00% [13],[29]  
Principal Amount | €   € 19.0 [9],[15],[34]             € 19.0 [13],[16],[29]          
Amortized Cost $ 19,300,000 [9],[34]             $ 19,300,000 [13],[29]            
Fair Value $ 20,000,000.0 [1],[9],[34]             $ 20,200,000 [2],[13],[29]            
Investment, Identifier [Axis]: Ardonagh Group Ltd, Insurance 3                            
Rate, basis spread on variable rate [8],[20],[34] 6.75% 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%              
Rate, PIK [10],[13],[29],[41]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%  
Rate, Max PIK [10],[13],[29],[41]               12.80% 12.80% 12.80% 12.80% 12.80% 12.80%  
Rate, stated interest rate [10],[13],[29],[41]               11.50% 11.50% 11.50% 11.50% 11.50% 11.50%  
Floor [8],[9],[34] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%              
Principal Amount $ 9,900,000 [9],[15],[34]             $ 1,000,000.0 [13],[16],[29],[41]            
Amortized Cost 9,400,000 [9],[34]             1,000,000.0 [13],[29],[41]            
Fair Value $ 9,800,000 [1],[9],[34]             $ 900,000 [2],[13],[29],[41]            
Investment, Identifier [Axis]: Ardonagh Group Ltd, Insurance 4                            
Floor [8],[20],[34] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%              
Principal Amount [15],[20],[34] $ 9,900,000                          
Amortized Cost [20],[34] 9,900,000                          
Fair Value [1],[20],[34] $ 9,800,000                          
Investment, Identifier [Axis]: Arena Energy LP, Warrants, Energy                            
Principal (in shares) | shares 68,186,525 [9] 68,186,525 [9] 68,186,525 [9] 68,186,525 [9] 68,186,525 [9] 68,186,525 [9] 68,186,525 [9] 68,186,525 [13] 68,186,525 [13] 68,186,525 [13] 68,186,525 [13] 68,186,525 [13] 68,186,525 [13]  
Amortized Cost $ 400,000 [9]             $ 400,000 [13]            
Fair Value $ 300,000 [1],[9]             $ 500,000 [2],[13]            
Investment, Identifier [Axis]: Arrotex Australia Group Pty Ltd, Pharmaceuticals, Biotechnology & Life Sciences 1                            
Rate, basis spread on variable rate [10],[13],[29]               5.25% 5.25% 5.25% 5.25% 5.25% 5.25%  
Floor [13],[29]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [13],[16],[29]                         $ 42.6  
Amortized Cost [13],[29]               $ 31,100,000            
Fair Value [2],[13],[29]               $ 29,000,000.0            
Investment, Identifier [Axis]: Arrotex Australia Group Pty Ltd, Pharmaceuticals, Biotechnology & Life Sciences 2                            
Rate, basis spread on variable rate [10],[13],[29]               5.25% 5.25% 5.25% 5.25% 5.25% 5.25%  
Floor [13],[29]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [13],[16],[29]                         $ 3.1  
Amortized Cost [13],[29]               $ 2,200,000            
Fair Value [2],[13],[29]               $ 2,100,000            
Investment, Identifier [Axis]: Ascent Resources Utica Holdings LLC / ARU Finance Corp, Common Stock, Energy                            
Principal (in shares) | shares 10,193 [33],[49] 10,193 [33],[49] 10,193 [33],[49] 10,193 [33],[49] 10,193 [33],[49] 10,193 [33],[49] 10,193 [33],[49] 10,193 [28],[50] 10,193 [28],[50] 10,193 [28],[50] 10,193 [28],[50] 10,193 [28],[50] 10,193 [28],[50]  
Amortized Cost $ 9,700,000 [33],[49]             $ 9,700,000 [28],[50]            
Fair Value $ 2,800,000 [1],[33],[49]             $ 3,600,000 [2],[28],[50]            
Investment, Identifier [Axis]: Ascent Resources Utica Holdings LLC / ARU Finance Corp, Energy                            
Principal (in shares) | shares [33],[49] 866,071 866,071 866,071 866,071 866,071 866,071 866,071              
Amortized Cost [33],[49] $ 19,400,000                          
Fair Value [1],[33],[49] 24,100,000                          
Investment, Identifier [Axis]: Ascent Resources Utica Holdings LLC / ARU Finance Corp, Trade Claim, Energy                            
Principal (in shares) | shares [28],[50]               86,607,143 86,607,143 86,607,143 86,607,143 86,607,143 86,607,143  
Amortized Cost [28],[50]               $ 19,400,000            
Fair Value [2],[28],[50]               30,500,000            
Investment, Identifier [Axis]: Australis Maritime II, Private Equity                            
Fair Value $ 9,900,000             $ 0            
Investment, Identifier [Axis]: Australis Maritime II, Private Equity, Transportation                            
Principal (in shares) | shares [9],[15],[33],[34],[35] 9,514,877 9,514,877 9,514,877 9,514,877 9,514,877 9,514,877 9,514,877              
Amortized Cost [9],[33],[34],[35] $ 9,500,000                          
Fair Value [1],[9],[33],[34],[35] $ 9,900,000                          
Investment, Identifier [Axis]: Australis Maritime, Common Stock, Transportation                            
Principal (in shares) | shares 40,309,332 [9],[15],[34] 40,309,332 [9],[15],[34] 40,309,332 [9],[15],[34] 40,309,332 [9],[15],[34] 40,309,332 [9],[15],[34] 40,309,332 [9],[15],[34] 40,309,332 [9],[15],[34] 48,936,056 [13],[16],[29] 48,936,056 [13],[16],[29] 48,936,056 [13],[16],[29] 48,936,056 [13],[16],[29] 48,936,056 [13],[16],[29] 48,936,056 [13],[16],[29]  
Amortized Cost $ 40,000,000.0 [9],[34]             $ 47,600,000 [13],[29]            
Fair Value 40,200,000 [1],[9],[34]             49,300,000 [2],[13],[29]            
Investment, Identifier [Axis]: Avenue One PropCo, Private Equity                            
Fair Value $ 35,600,000             $ 31,000,000.0           0
Investment, Identifier [Axis]: Avenue One PropCo, Private Equity, Equity Real Estate Investment Trusts (REITs)                            
Principal (in shares) | shares [9],[15],[33],[34],[35] 35,392,504 35,392,504 35,392,504 35,392,504 35,392,504 35,392,504 35,392,504              
Amortized Cost [9],[33],[34],[35] $ 35,400,000                          
Fair Value [1],[9],[33],[34],[35] 35,600,000                          
Investment, Identifier [Axis]: Avenue One PropCo, Private Equity, Real Estate                            
Principal (in shares) | shares [13],[16],[28],[29],[36]               30,064,353 30,064,353 30,064,353 30,064,353 30,064,353 30,064,353  
Amortized Cost [13],[28],[29],[36]               $ 30,100,000            
Fair Value [2],[13],[28],[29],[36]               31,000,000.0            
Investment, Identifier [Axis]: Avida Holding AB, Common Stock                            
Fair Value $ 39,300,000             $ 42,600,000           52,300,000
Investment, Identifier [Axis]: Avida Holding AB, Common Stock, Diversified Financials                            
Principal (in shares) | shares [13],[16],[28],[29],[36]               405,023,756 405,023,756 405,023,756 405,023,756 405,023,756 405,023,756  
Amortized Cost [13],[28],[29],[36]               $ 44,600,000            
Fair Value [2],[13],[28],[29],[36]               $ 42,600,000            
Investment, Identifier [Axis]: Avida Holding AB, Common Stock, Financial Services                            
Principal (in shares) | shares [9],[15],[33],[34],[35] 444,962,569 444,962,569 444,962,569 444,962,569 444,962,569 444,962,569 444,962,569              
Amortized Cost [9],[33],[34],[35] $ 49,900,000                          
Fair Value [1],[9],[33],[34],[35] $ 39,300,000                          
Investment, Identifier [Axis]: AxiomSL Ltd, Software & Services 1                            
Rate, basis spread on variable rate 5.75% [8],[9],[23],[24],[43] 5.75% [8],[9],[23],[24],[43] 5.75% [8],[9],[23],[24],[43] 5.75% [8],[9],[23],[24],[43] 5.75% [8],[9],[23],[24],[43] 5.75% [8],[9],[23],[24],[43] 5.75% [8],[9],[23],[24],[43] 6.00% [10],[13],[21],[22],[42] 6.00% [10],[13],[21],[22],[42] 6.00% [10],[13],[21],[22],[42] 6.00% [10],[13],[21],[22],[42] 6.00% [10],[13],[21],[22],[42] 6.00% [10],[13],[21],[22],[42]  
Floor 1.00% [8],[9],[23],[24],[43] 1.00% [8],[9],[23],[24],[43] 1.00% [8],[9],[23],[24],[43] 1.00% [8],[9],[23],[24],[43] 1.00% [8],[9],[23],[24],[43] 1.00% [8],[9],[23],[24],[43] 1.00% [8],[9],[23],[24],[43] 1.00% [13],[21],[22],[42] 1.00% [13],[21],[22],[42] 1.00% [13],[21],[22],[42] 1.00% [13],[21],[22],[42] 1.00% [13],[21],[22],[42] 1.00% [13],[21],[22],[42]  
Principal Amount $ 34,500,000 [9],[15],[23],[24],[43]             $ 34,700,000 [13],[16],[21],[22],[42]            
Amortized Cost 34,000,000.0 [9],[23],[24],[43]             34,100,000 [13],[21],[22],[42]            
Fair Value $ 34,500,000 [1],[9],[23],[24],[43]             $ 33,700,000 [2],[13],[21],[22],[42]            
Investment, Identifier [Axis]: AxiomSL Ltd, Software & Services 2                            
Rate, basis spread on variable rate 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 6.00% [10],[19] 6.00% [10],[19] 6.00% [10],[19] 6.00% [10],[19] 6.00% [10],[19] 6.00% [10],[19]  
Floor 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19]  
Principal Amount $ 2,500,000 [15],[20]             $ 2,500,000 [16],[19]            
Amortized Cost 2,500,000 [20]             2,400,000 [19]            
Fair Value $ 2,500,000 [1],[20]             $ 2,400,000 [2],[19]            
Investment, Identifier [Axis]: AxiomSL Ltd, Software & Services 3                            
Rate, basis spread on variable rate [10],[19]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Floor [19]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [16],[19]               $ 2,300,000            
Amortized Cost [19]               2,300,000            
Fair Value [2],[19]               $ 2,200,000            
Investment, Identifier [Axis]: BDO USA PA, Commercial & Professional Services                            
Rate, basis spread on variable rate [8],[9] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%              
Floor [8],[9] 2.00% 2.00% 2.00% 2.00% 2.00% 2.00% 2.00%              
Principal Amount [9],[15] $ 28,400,000                          
Amortized Cost [9] 27,900,000                          
Fair Value [1],[9] $ 27,900,000                          
Investment, Identifier [Axis]: BGB Group LLC, Media & Entertainment 1                            
Rate, basis spread on variable rate 5.75% [8],[17],[18],[23],[24],[43] 5.75% [8],[17],[18],[23],[24],[43] 5.75% [8],[17],[18],[23],[24],[43] 5.75% [8],[17],[18],[23],[24],[43] 5.75% [8],[17],[18],[23],[24],[43] 5.75% [8],[17],[18],[23],[24],[43] 5.75% [8],[17],[18],[23],[24],[43] 5.75% [10],[11],[12],[14],[21],[22],[42] 5.75% [10],[11],[12],[14],[21],[22],[42] 5.75% [10],[11],[12],[14],[21],[22],[42] 5.75% [10],[11],[12],[14],[21],[22],[42] 5.75% [10],[11],[12],[14],[21],[22],[42] 5.75% [10],[11],[12],[14],[21],[22],[42]  
Floor 1.00% [8],[17],[18],[23],[24],[43] 1.00% [8],[17],[18],[23],[24],[43] 1.00% [8],[17],[18],[23],[24],[43] 1.00% [8],[17],[18],[23],[24],[43] 1.00% [8],[17],[18],[23],[24],[43] 1.00% [8],[17],[18],[23],[24],[43] 1.00% [8],[17],[18],[23],[24],[43] 1.00% [11],[12],[14],[21],[22],[42] 1.00% [11],[12],[14],[21],[22],[42] 1.00% [11],[12],[14],[21],[22],[42] 1.00% [11],[12],[14],[21],[22],[42] 1.00% [11],[12],[14],[21],[22],[42] 1.00% [11],[12],[14],[21],[22],[42]  
Principal Amount $ 110,300,000 [15],[17],[18],[23],[24],[43]             $ 111,100,000 [11],[12],[14],[16],[21],[22],[42]            
Amortized Cost 109,500,000 [17],[18],[23],[24],[43]             110,300,000 [11],[12],[14],[21],[22],[42]            
Fair Value $ 107,600,000 [1],[17],[18],[23],[24],[43]             $ 108,400,000 [2],[11],[12],[14],[21],[22],[42]            
Investment, Identifier [Axis]: BGB Group LLC, Media & Entertainment 2                            
Rate, basis spread on variable rate 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19]  
Floor 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19]  
Principal Amount $ 19,900,000 [15],[20]             $ 19,900,000 [16],[19]            
Amortized Cost 19,900,000 [20]             19,900,000 [19]            
Fair Value $ 19,500,000 [1],[20]             $ 19,500,000 [2],[19]            
Investment, Identifier [Axis]: Bankers Healthcare Group LLC, Term Loan, Diversified Financials                            
Rate, basis spread on variable rate [10],[13],[29]               3.93% 3.93% 3.93% 3.93% 3.93% 3.93%  
Floor [9],[34]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%  
Principal Amount [13],[16],[29]               $ 11,300,000            
Amortized Cost [13],[29]               11,300,000            
Fair Value [2],[13],[29]               $ 11,300,000            
Investment, Identifier [Axis]: Bankers Healthcare Group LLC, Term Loan, Financial Services                            
Rate, stated interest rate [9],[34] 22.00% 22.00% 22.00% 22.00% 22.00% 22.00% 22.00%              
Floor [8],[9],[34] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%              
Principal Amount [9],[15],[34] $ 11,300,000                          
Amortized Cost [9],[34] 11,300,000                          
Fair Value [1],[9],[34] $ 11,300,000                          
Investment, Identifier [Axis]: Barbri Inc, Consumer Services 1                            
Rate, basis spread on variable rate 5.75% [8],[9],[18],[23],[24],[43] 5.75% [8],[9],[18],[23],[24],[43] 5.75% [8],[9],[18],[23],[24],[43] 5.75% [8],[9],[18],[23],[24],[43] 5.75% [8],[9],[18],[23],[24],[43] 5.75% [8],[9],[18],[23],[24],[43] 5.75% [8],[9],[18],[23],[24],[43] 5.75% [10],[11],[12],[21],[22],[42] 5.75% [10],[11],[12],[21],[22],[42] 5.75% [10],[11],[12],[21],[22],[42] 5.75% [10],[11],[12],[21],[22],[42] 5.75% [10],[11],[12],[21],[22],[42] 5.75% [10],[11],[12],[21],[22],[42]  
Floor 0.80% [8],[9],[18],[23],[24],[43] 0.80% [8],[9],[18],[23],[24],[43] 0.80% [8],[9],[18],[23],[24],[43] 0.80% [8],[9],[18],[23],[24],[43] 0.80% [8],[9],[18],[23],[24],[43] 0.80% [8],[9],[18],[23],[24],[43] 0.80% [8],[9],[18],[23],[24],[43] 0.80% [11],[12],[21],[22],[42] 0.80% [11],[12],[21],[22],[42] 0.80% [11],[12],[21],[22],[42] 0.80% [11],[12],[21],[22],[42] 0.80% [11],[12],[21],[22],[42] 0.80% [11],[12],[21],[22],[42]  
Principal Amount $ 90,800,000 [9],[15],[18],[23],[24],[43]             $ 61,500,000 [11],[12],[16],[21],[22],[42]            
Amortized Cost 87,400,000 [9],[18],[23],[24],[43]             57,700,000 [11],[12],[21],[22],[42]            
Fair Value $ 88,800,000 [1],[9],[18],[23],[24],[43]             $ 61,000,000.0 [2],[11],[12],[21],[22],[42]            
Investment, Identifier [Axis]: Barbri Inc, Consumer Services 2                            
Rate, basis spread on variable rate 5.75% [8],[9],[18] 5.75% [8],[9],[18] 5.75% [8],[9],[18] 5.75% [8],[9],[18] 5.75% [8],[9],[18] 5.75% [8],[9],[18] 5.75% [8],[9],[18] 5.75% [10],[11],[12],[13] 5.75% [10],[11],[12],[13] 5.75% [10],[11],[12],[13] 5.75% [10],[11],[12],[13] 5.75% [10],[11],[12],[13] 5.75% [10],[11],[12],[13]  
Floor 0.80% [8],[9],[18] 0.80% [8],[9],[18] 0.80% [8],[9],[18] 0.80% [8],[9],[18] 0.80% [8],[9],[18] 0.80% [8],[9],[18] 0.80% [8],[9],[18] 0.80% [11],[12],[13] 0.80% [11],[12],[13] 0.80% [11],[12],[13] 0.80% [11],[12],[13] 0.80% [11],[12],[13] 0.80% [11],[12],[13]  
Principal Amount $ 40,100,000 [9],[15],[18]             $ 70,300,000 [11],[12],[13],[16]            
Amortized Cost 39,800,000 [9],[18]             70,000,000.0 [11],[12],[13]            
Fair Value $ 39,200,000 [1],[9],[18]             $ 69,700,000 [2],[11],[12],[13]            
Investment, Identifier [Axis]: Barbri Inc, Consumer Services 3                            
Rate, basis spread on variable rate [10],[19]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%  
Floor [19]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%  
Principal Amount [16],[19]               $ 9,100,000            
Amortized Cost [19]               9,100,000            
Fair Value [2],[19]               9,100,000            
Investment, Identifier [Axis]: Bausch Health Cos Inc, Pharmaceuticals, Biotechnology & Life Sciences 1                            
Rate, basis spread on variable rate [8],[9],[34] 6.65% 6.65% 6.65% 6.65% 6.65% 6.65% 6.65%              
Floor [8],[9],[34] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [9],[15],[34] $ 70,000,000.0                          
Amortized Cost [9],[34] 70,000,000.0                          
Fair Value [1],[9],[34] $ 70,000,000.0                          
Investment, Identifier [Axis]: Bausch Health Cos Inc, Pharmaceuticals, Biotechnology & Life Sciences 2                            
Rate, basis spread on variable rate [8],[20],[34] 6.65% 6.65% 6.65% 6.65% 6.65% 6.65% 6.65%              
Floor [8],[20],[34] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [15],[20],[34] $ 50,000,000.0                          
Amortized Cost [20],[34] 50,000,000.0                          
Fair Value [1],[20],[34] 50,000,000.0                          
Investment, Identifier [Axis]: Belk Inc                            
Fair Value 0             3,300,000            
Investment, Identifier [Axis]: Belk Inc 1                            
Fair Value 13,700,000             8,800,000            
Investment, Identifier [Axis]: Belk Inc 2                            
Fair Value 18,900,000             19,400,000            
Investment, Identifier [Axis]: Belk Inc 2, Senior Secured Loans—First Lien -1                            
Fair Value               19,400,000           21,900,000
Investment, Identifier [Axis]: Belk Inc, Common Stock                            
Fair Value $ 0             0            
Investment, Identifier [Axis]: Belk Inc, Common Stock, Consumer Discretionary Distribution & Retail                            
Principal (in shares) | shares [9],[33],[44] 94,950 94,950 94,950 94,950 94,950 94,950 94,950              
Amortized Cost [9],[33],[44] $ 0                          
Fair Value [1],[9],[33],[44] $ 0                          
Investment, Identifier [Axis]: Belk Inc, Common Stock, Equity/Other                            
Fair Value               $ 0           0
Investment, Identifier [Axis]: Belk Inc, Common Stock, Retailing                            
Principal (in shares) | shares [13],[28],[45]               94,950 94,950 94,950 94,950 94,950 94,950  
Amortized Cost [13],[28],[45]               $ 0            
Fair Value [2],[13],[28],[45]               $ 0            
Investment, Identifier [Axis]: Belk Inc, Consumer Discretionary Distribution & Retail                            
Rate, PIK [8],[9],[30],[33],[44] 10.00% 10.00% 10.00% 10.00% 10.00% 10.00% 10.00%              
Rate, Max PIK [8],[9],[30],[33],[44] 10.00% 10.00% 10.00% 10.00% 10.00% 10.00% 10.00%              
Principal Amount [9],[15],[30],[33],[44] $ 30,400,000                          
Amortized Cost [9],[30],[33],[44] 4,200,000                          
Fair Value [1],[9],[30],[33],[44] $ 0                          
Investment, Identifier [Axis]: Belk Inc, Consumer Discretionary Distribution & Retail 1                            
Rate, basis spread on variable rate [8],[9],[40],[44] 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%              
Floor [8],[9],[40],[44] 2.00% 2.00% 2.00% 2.00% 2.00% 2.00% 2.00%              
Principal Amount [9],[15],[40],[44] $ 21,900,000                          
Amortized Cost [9],[40],[44] 21,800,000                          
Fair Value [1],[9],[40],[44] $ 18,900,000                          
Investment, Identifier [Axis]: Belk Inc, Consumer Discretionary Distribution & Retail 2                            
Rate, basis spread on variable rate [8],[9],[30],[33],[40],[44] 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%              
Rate, PIK [8],[9],[30],[33],[40],[44] 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%              
Rate, Max PIK [8],[9],[30],[33],[40],[44] 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%              
Principal Amount [9],[15],[30],[33],[40],[44] $ 71,300,000                          
Amortized Cost [9],[30],[33],[40],[44] 37,600,000                          
Fair Value [1],[9],[30],[33],[40],[44] 13,700,000                          
Investment, Identifier [Axis]: Belk Inc, Retailing                            
Rate, PIK [10],[13],[25],[28],[45]               10.00% 10.00% 10.00% 10.00% 10.00% 10.00%  
Rate, Max PIK [10],[13],[25],[28],[45]               10.00% 10.00% 10.00% 10.00% 10.00% 10.00%  
Principal Amount [13],[16],[25],[28],[45]               $ 28,200,000            
Amortized Cost [13],[25],[28],[45]               4,200,000            
Fair Value [2],[13],[25],[28],[45]               $ 3,300,000            
Investment, Identifier [Axis]: Belk Inc, Retailing 1                            
Rate, basis spread on variable rate [10],[13],[41],[45]               7.50% 7.50% 7.50% 7.50% 7.50% 7.50%  
Floor [13],[41],[45]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [13],[16],[41],[45]               $ 21,900,000            
Amortized Cost [13],[41],[45]               21,800,000            
Fair Value [2],[13],[41],[45]               $ 19,400,000            
Investment, Identifier [Axis]: Belk Inc, Retailing 2                            
Rate, PIK [10],[13],[25],[28],[41],[45]               8.00% 8.00% 8.00% 8.00% 8.00% 8.00%  
Rate, Max PIK [10],[13],[25],[28],[41],[45]               8.00% 8.00% 8.00% 8.00% 8.00% 8.00%  
Rate, stated interest rate [10],[13],[25],[28],[41],[45]               5.00% 5.00% 5.00% 5.00% 5.00% 5.00%  
Principal Amount [13],[16],[25],[28],[41],[45]               $ 71,000,000.0            
Amortized Cost [13],[25],[28],[41],[45]               42,500,000            
Fair Value [2],[13],[25],[28],[41],[45]               8,800,000            
Investment, Identifier [Axis]: Belk Inc, Senior Secured Loans—First Lien -2                            
Fair Value               8,800,000           49,200,000
Investment, Identifier [Axis]: Borden (New Dairy Opco) 2, Senior Secured Loans—First Lien                            
Fair Value               0           42,000,000.0
Investment, Identifier [Axis]: Borden (New Dairy Opco), Common Stock                            
Fair Value $ 13,400,000             4,800,000            
Investment, Identifier [Axis]: Borden (New Dairy Opco), Common Stock, Equity/Other                            
Fair Value               $ 4,800,000           7,700,000
Investment, Identifier [Axis]: Borden (New Dairy Opco), Common Stock, Food, Beverage & Tobacco                            
Principal (in shares) | shares 6,822,559 [33],[44],[47],[51] 6,822,559 [33],[44],[47],[51] 6,822,559 [33],[44],[47],[51] 6,822,559 [33],[44],[47],[51] 6,822,559 [33],[44],[47],[51] 6,822,559 [33],[44],[47],[51] 6,822,559 [33],[44],[47],[51] 11,167,000 [28],[45],[48],[52] 11,167,000 [28],[45],[48],[52] 11,167,000 [28],[45],[48],[52] 11,167,000 [28],[45],[48],[52] 11,167,000 [28],[45],[48],[52] 11,167,000 [28],[45],[48],[52]  
Amortized Cost $ 5,600,000 [33],[44],[47],[51]             $ 9,100,000 [28],[45],[48],[52]            
Fair Value $ 13,400,000 [1],[33],[44],[47],[51]             4,800,000 [2],[28],[45],[48],[52]            
Investment, Identifier [Axis]: Borden (New Dairy Opco), Senior Secured Loans—First Lien -2                            
Fair Value               0           9,000,000.0
Investment, Identifier [Axis]: Borden Dairy Co, Senior Secured Loans—First Lien                            
Fair Value               $ 0           0
Investment, Identifier [Axis]: Bowery Farming Inc, Food, Beverage & Tobacco                            
Rate, basis spread on variable rate [10],[13]               10.00% 10.00% 10.00% 10.00% 10.00% 10.00%  
Rate, PIK [8],[9],[30],[33] 10.00% 10.00% 10.00% 10.00% 10.00% 10.00% 10.00%              
Rate, Max PIK [8],[9],[30],[33] 10.00% 10.00% 10.00% 10.00% 10.00% 10.00% 10.00%              
Floor 1.00% [8],[9],[30],[33] 1.00% [8],[9],[30],[33] 1.00% [8],[9],[30],[33] 1.00% [8],[9],[30],[33] 1.00% [8],[9],[30],[33] 1.00% [8],[9],[30],[33] 1.00% [8],[9],[30],[33] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13]  
Principal Amount $ 65,000,000.0 [9],[15],[30],[33]             $ 75,000,000.0 [13],[16]            
Amortized Cost 61,700,000 [9],[30],[33]             74,400,000 [13]            
Fair Value $ 13,300,000 [1],[9],[30],[33]             $ 70,300,000 [2],[13]            
Investment, Identifier [Axis]: Bowery Farming Inc, Warrants, Food, Beverage & Tobacco                            
Principal (in shares) | shares 161,828 [9],[33] 161,828 [9],[33] 161,828 [9],[33] 161,828 [9],[33] 161,828 [9],[33] 161,828 [9],[33] 161,828 [9],[33] 161,828 [13],[28] 161,828 [13],[28] 161,828 [13],[28] 161,828 [13],[28] 161,828 [13],[28] 161,828 [13],[28]  
Amortized Cost $ 0 [9],[33]             $ 0 [13],[28]            
Fair Value $ 0 [1],[9],[33]             $ 2,500,000 [2],[13],[28]            
Investment, Identifier [Axis]: Byrider Finance LLC, Private Equity, Automobiles & Components                            
Principal (in shares) | shares 54,407 [9],[15],[33],[53] 54,407 [9],[15],[33],[53] 54,407 [9],[15],[33],[53] 54,407 [9],[15],[33],[53] 54,407 [9],[15],[33],[53] 54,407 [9],[15],[33],[53] 54,407 [9],[15],[33],[53] 54,407 [13],[16],[29],[54] 54,407 [13],[16],[29],[54] 54,407 [13],[16],[29],[54] 54,407 [13],[16],[29],[54] 54,407 [13],[16],[29],[54] 54,407 [13],[16],[29],[54]  
Amortized Cost $ 0 [9],[33],[53]             $ 0 [13],[29],[54]            
Fair Value $ 0 [1],[9],[33],[53]             $ 0 [2],[13],[29],[54]            
Investment, Identifier [Axis]: Byrider Finance LLC, Structured Mezzanine, Automobiles & Components 1                            
Rate, basis spread on variable rate [10],[13]               10.50% 10.50% 10.50% 10.50% 10.50% 10.50%  
Floor [13]               0.30% 0.30% 0.30% 0.30% 0.30% 0.30%  
Principal Amount [13],[16]               $ 16,200,000            
Amortized Cost [13]               16,200,000            
Fair Value [2],[13]               $ 16,100,000            
Investment, Identifier [Axis]: Byrider Finance LLC, Structured Mezzanine, Automobiles & Components 2                            
Rate, basis spread on variable rate [10],[19]               10.50% 10.50% 10.50% 10.50% 10.50% 10.50%  
Floor [19]               0.30% 0.30% 0.30% 0.30% 0.30% 0.30%  
Principal Amount [16],[19]               $ 6,800,000            
Amortized Cost [19]               6,800,000            
Fair Value [2],[19]               $ 6,800,000            
Investment, Identifier [Axis]: Byrider Finance LLC, Term Loan, Automobiles & Components                            
Principal (in shares) | shares 5,000,000 [9],[15],[33],[53] 5,000,000 [9],[15],[33],[53] 5,000,000 [9],[15],[33],[53] 5,000,000 [9],[15],[33],[53] 5,000,000 [9],[15],[33],[53] 5,000,000 [9],[15],[33],[53] 5,000,000 [9],[15],[33],[53] 5,000,000 [13],[16],[29],[54] 5,000,000 [13],[16],[29],[54] 5,000,000 [13],[16],[29],[54] 5,000,000 [13],[16],[29],[54] 5,000,000 [13],[16],[29],[54] 5,000,000 [13],[16],[29],[54]  
Amortized Cost $ 5,000,000.0 [9],[33],[53]             $ 5,000,000.0 [13],[29],[54]            
Fair Value $ 0 [1],[9],[33],[53]             $ 5,000,000.0 [2],[13],[29],[54]            
Investment, Identifier [Axis]: CDS US Intermediate Holdings Inc, Warrant, Media & Entertainment                            
Principal (in shares) | shares 2,023,714 [9],[33],[34] 2,023,714 [9],[33],[34] 2,023,714 [9],[33],[34] 2,023,714 [9],[33],[34] 2,023,714 [9],[33],[34] 2,023,714 [9],[33],[34] 2,023,714 [9],[33],[34] 2,023,714 [13],[28],[29] 2,023,714 [13],[28],[29] 2,023,714 [13],[28],[29] 2,023,714 [13],[28],[29] 2,023,714 [13],[28],[29] 2,023,714 [13],[28],[29]  
Amortized Cost $ 0.0 [9],[33],[34]             $ 0 [13],[28],[29]            
Fair Value $ 6,100,000 [1],[9],[33],[34]             $ 4,000,000.0 [2],[13],[28],[29]            
Investment, Identifier [Axis]: CFC Underwriting Ltd, Insurance                            
Rate, basis spread on variable rate 5.00% [8],[20],[34] 5.00% [8],[20],[34] 5.00% [8],[20],[34] 5.00% [8],[20],[34] 5.00% [8],[20],[34] 5.00% [8],[20],[34] 5.00% [8],[20],[34] 5.50% [10],[19],[29] 5.50% [10],[19],[29] 5.50% [10],[19],[29] 5.50% [10],[19],[29] 5.50% [10],[19],[29] 5.50% [10],[19],[29]  
Rate, PIK 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [10] 0.00% [10] 0.00% [10] 0.00% [10] 0.00% [10] 0.00% [10]  
Rate, Max PIK 2.80% [8],[20],[34] 2.80% [8],[20],[34] 2.80% [8],[20],[34] 2.80% [8],[20],[34] 2.80% [8],[20],[34] 2.80% [8],[20],[34] 2.80% [8],[20],[34] 2.80% [10],[19],[29] 2.80% [10],[19],[29] 2.80% [10],[19],[29] 2.80% [10],[19],[29] 2.80% [10],[19],[29] 2.80% [10],[19],[29]  
Floor 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [19],[29] 0.00% [19],[29] 0.00% [19],[29] 0.00% [19],[29] 0.00% [19],[29] 0.00% [19],[29]  
Principal Amount | £         £ 4.7 [15],[20],[34]             £ 4.7 [16],[19],[29]    
Amortized Cost $ 5,700,000 [20],[34]             $ 5,700,000 [19],[29]            
Fair Value $ 5,800,000 [1],[20],[34]             $ 5,700,000 [2],[19],[29]            
Investment, Identifier [Axis]: CSafe Global, Capital Goods 1                            
Rate, basis spread on variable rate 6.25% [8],[9] 6.25% [8],[9] 6.25% [8],[9] 6.25% [8],[9] 6.25% [8],[9] 6.25% [8],[9] 6.25% [8],[9] 6.25% [10],[12],[13],[14],[21],[22],[42] 6.25% [10],[12],[13],[14],[21],[22],[42] 6.25% [10],[12],[13],[14],[21],[22],[42] 6.25% [10],[12],[13],[14],[21],[22],[42] 6.25% [10],[12],[13],[14],[21],[22],[42] 6.25% [10],[12],[13],[14],[21],[22],[42]  
Floor 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [11],[12],[13],[14],[21],[22],[42] 0.80% [11],[12],[13],[14],[21],[22],[42] 0.80% [11],[12],[13],[14],[21],[22],[42] 0.80% [11],[12],[13],[14],[21],[22],[42] 0.80% [11],[12],[13],[14],[21],[22],[42] 0.80% [11],[12],[13],[14],[21],[22],[42]  
Principal Amount $ 10,100,000 [9],[15]             $ 186,800,000 [11],[12],[13],[14],[16],[21],[22],[42]            
Amortized Cost 10,100,000 [9]             181,500,000 [11],[12],[13],[14],[21],[22],[42]            
Fair Value $ 10,100,000 [1],[9]             $ 186,800,000 [2],[11],[12],[13],[14],[21],[22],[42]            
Investment, Identifier [Axis]: CSafe Global, Capital Goods 2                            
Rate, basis spread on variable rate 6.25% [8],[9],[18],[23],[24],[43] 6.25% [8],[9],[18],[23],[24],[43] 6.25% [8],[9],[18],[23],[24],[43] 6.25% [8],[9],[18],[23],[24],[43] 6.25% [8],[9],[18],[23],[24],[43] 6.25% [8],[9],[18],[23],[24],[43] 6.25% [8],[9],[18],[23],[24],[43] 6.25% [10],[13] 6.25% [10],[13] 6.25% [10],[13] 6.25% [10],[13] 6.25% [10],[13] 6.25% [10],[13]  
Floor 1.00% [8],[9],[18],[23],[24],[43] 1.00% [8],[9],[18],[23],[24],[43] 1.00% [8],[9],[18],[23],[24],[43] 1.00% [8],[9],[18],[23],[24],[43] 1.00% [8],[9],[18],[23],[24],[43] 1.00% [8],[9],[18],[23],[24],[43] 1.00% [8],[9],[18],[23],[24],[43] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13]  
Principal Amount $ 102,300,000 [9],[15],[18],[23],[24],[43]                     £ 27.2 [13],[16]    
Amortized Cost 97,700,000 [9],[18],[23],[24],[43]             $ 35,900,000 [13]            
Fair Value $ 102,000,000.0 [1],[9],[18],[23],[24],[43]             $ 32,800,000 [2],[13]            
Investment, Identifier [Axis]: CSafe Global, Capital Goods 3                            
Rate, basis spread on variable rate 6.25% [8],[9],[17] 6.25% [8],[9],[17] 6.25% [8],[9],[17] 6.25% [8],[9],[17] 6.25% [8],[9],[17] 6.25% [8],[9],[17] 6.25% [8],[9],[17] 6.25% [10],[13] 6.25% [10],[13] 6.25% [10],[13] 6.25% [10],[13] 6.25% [10],[13] 6.25% [10],[13]  
Floor 1.00% [8],[9],[17] 1.00% [8],[9],[17] 1.00% [8],[9],[17] 1.00% [8],[9],[17] 1.00% [8],[9],[17] 1.00% [8],[9],[17] 1.00% [8],[9],[17] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13]  
Principal Amount $ 83,100,000 [9],[15],[17]             $ 11,800,000 [13],[16]            
Amortized Cost 83,100,000 [9],[17]             11,800,000 [13]            
Fair Value $ 82,800,000 [1],[9],[17]             $ 11,800,000 [2],[13]            
Investment, Identifier [Axis]: CSafe Global, Capital Goods 4                            
Rate, basis spread on variable rate [10],[19]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%  
Floor [19]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%  
Principal Amount [16],[19]               $ 34,900,000            
Amortized Cost [19]               34,900,000            
Fair Value [2],[19]               $ 34,700,000            
Investment, Identifier [Axis]: CSafe Global, Capital Goods 4                            
Rate, basis spread on variable rate [8],[9] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%              
Floor [8],[9] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount | £ [9],[15]         £ 26.9                  
Amortized Cost [9] $ 35,700,000                          
Fair Value [1],[9] $ 32,800,000                          
Investment, Identifier [Axis]: CSafe Global, Capital Goods 5                            
Rate, basis spread on variable rate [8],[9],[43] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%              
Floor [8],[9],[43] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [9],[15],[43] $ 11,700,000                          
Amortized Cost [9],[43] 11,700,000                          
Fair Value [1],[9],[43] $ 11,700,000                          
Investment, Identifier [Axis]: CSafe Global, Capital Goods 6                            
Rate, basis spread on variable rate [8],[20] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%              
Floor [8],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%              
Principal Amount [15],[20] $ 24,700,000                          
Amortized Cost [20] 24,700,000                          
Fair Value [1],[20] $ 24,700,000                          
Investment, Identifier [Axis]: CTI Foods Holding Co LLC, Common Stock, Food, Beverage & Tobacco                            
Principal (in shares) | shares 5,892 [9],[33] 5,892 [9],[33] 5,892 [9],[33] 5,892 [9],[33] 5,892 [9],[33] 5,892 [9],[33] 5,892 [9],[33] 5,892 [13],[28] 5,892 [13],[28] 5,892 [13],[28] 5,892 [13],[28] 5,892 [13],[28] 5,892 [13],[28]  
Amortized Cost $ 700,000 [9],[33]             $ 700,000 [13],[28]            
Fair Value $ 0 [1],[9],[33]             $ 0 [2],[13],[28]            
Investment, Identifier [Axis]: Caldic BV, Consumer Discretionary Distribution & Retail 1                            
Rate, basis spread on variable rate [8],[34],[40],[43] 3.75% 3.75% 3.75% 3.75% 3.75% 3.75% 3.75%              
Floor [8],[34],[40],[43] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%              
Principal Amount [15],[34],[40],[43] $ 1,400,000                          
Amortized Cost [34],[40],[43] 1,400,000                          
Fair Value [1],[34],[40],[43] $ 1,400,000                          
Investment, Identifier [Axis]: Caldic BV, Consumer Discretionary Distribution & Retail 2                            
Rate, basis spread on variable rate [8],[9],[34],[40] 3.50% 3.50% 3.50% 3.50% 3.50% 3.50% 3.50%              
Floor [8],[9],[34],[40] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%              
Principal Amount | € [9],[15],[34],[40]   € 0.8                        
Amortized Cost [9],[34],[40] $ 900,000                          
Fair Value [1],[9],[34],[40] $ 900,000                          
Investment, Identifier [Axis]: Caldic BV, Consumer Discretionary Distribution & Retail 3                            
Rate, basis spread on variable rate [8],[9],[34] 7.25% 7.25% 7.25% 7.25% 7.25% 7.25% 7.25%              
Floor [8],[9],[34] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%              
Principal Amount [9],[15],[34] $ 40,000,000.0                          
Amortized Cost [9],[34] 39,000,000.0                          
Fair Value [1],[9],[34] $ 38,800,000                          
Investment, Identifier [Axis]: Caldic BV, Retailing                            
Rate, basis spread on variable rate [10],[13],[29]               7.25% 7.25% 7.25% 7.25% 7.25% 7.25%  
Floor [13],[29]               0.50% 0.50% 0.50% 0.50% 0.50% 0.50%  
Principal Amount [13],[16],[29]               $ 40,000,000.0            
Amortized Cost [13],[29]               39,000,000.0            
Fair Value [2],[13],[29]               $ 38,200,000            
Investment, Identifier [Axis]: Caldic BV, Retailing 1                            
Rate, basis spread on variable rate [10],[13],[29],[41]               3.50% 3.50% 3.50% 3.50% 3.50% 3.50%  
Floor [13],[29],[41]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%  
Principal Amount | € [13],[16],[29],[41]                 € 0.8          
Amortized Cost [13],[29],[41]               $ 900,000            
Fair Value [2],[13],[29],[41]               $ 800,000            
Investment, Identifier [Axis]: Caldic BV, Retailing 2                            
Rate, basis spread on variable rate [10],[13],[29],[41]               3.75% 3.75% 3.75% 3.75% 3.75% 3.75%  
Floor [13],[29],[41]               0.50% 0.50% 0.50% 0.50% 0.50% 0.50%  
Principal Amount [13],[16],[29],[41]               $ 1,400,000            
Amortized Cost [13],[29],[41]               1,400,000            
Fair Value [2],[13],[29],[41]               $ 1,400,000            
Investment, Identifier [Axis]: Callodine Commercial Finance LLC, 2L Term Loan A, Diversified Financials                            
Rate, basis spread on variable rate [10],[13]               9.00% 9.00% 9.00% 9.00% 9.00% 9.00%  
Floor [13]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [13],[16]               $ 125,000,000.0            
Amortized Cost [13]               119,300,000            
Fair Value [2],[13]               $ 125,300,000            
Investment, Identifier [Axis]: Callodine Commercial Finance LLC, 2L Term Loan A, Financial Services                            
Rate, basis spread on variable rate [8],[9] 9.00% 9.00% 9.00% 9.00% 9.00% 9.00% 9.00%              
Floor [8],[9] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [9],[15] $ 125,000,000.0                          
Amortized Cost [9] 120,600,000                          
Fair Value [1],[9] $ 125,900,000                          
Investment, Identifier [Axis]: Callodine Commercial Finance LLC, 2L Term Loan B, Diversified Financials 1                            
Rate, basis spread on variable rate [10],[13]               9.00% 9.00% 9.00% 9.00% 9.00% 9.00%  
Floor [13]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [13],[16]               $ 12,000,000.0            
Amortized Cost [13]               12,000,000.0            
Fair Value [2],[13]               $ 12,000,000.0            
Investment, Identifier [Axis]: Callodine Commercial Finance LLC, 2L Term Loan B, Diversified Financials 2                            
Rate, basis spread on variable rate [10],[19]               9.00% 9.00% 9.00% 9.00% 9.00% 9.00%  
Floor [19]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [16],[19]               $ 36,100,000            
Amortized Cost [19]               36,100,000            
Fair Value [2],[19]               $ 36,100,000            
Investment, Identifier [Axis]: Callodine Commercial Finance LLC, 2L Term Loan B, Financial Services 1                            
Rate, basis spread on variable rate [8],[9] 9.00% 9.00% 9.00% 9.00% 9.00% 9.00% 9.00%              
Floor [8],[9] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [9],[15] $ 12,000,000.0                          
Amortized Cost [9] 12,000,000.0                          
Fair Value [1],[9] $ 12,100,000                          
Investment, Identifier [Axis]: Callodine Commercial Finance LLC, 2L Term Loan B, Financial Services 2                            
Rate, basis spread on variable rate [8],[20] 9.00% 9.00% 9.00% 9.00% 9.00% 9.00% 9.00%              
Floor [8],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [15],[20] $ 36,100,000                          
Amortized Cost [20] 36,100,000                          
Fair Value [1],[20] $ 36,300,000                          
Investment, Identifier [Axis]: Capital Automotive LP, Private Equity, Equity Real Estate Investment Trusts (REITs)                            
Principal (in shares) | shares [9],[15],[34] 21,415,859 21,415,859 21,415,859 21,415,859 21,415,859 21,415,859 21,415,859              
Amortized Cost [9],[34] $ 23,500,000                          
Fair Value [1],[9],[34] $ 30,900,000                          
Investment, Identifier [Axis]: Capital Automotive LP, Private Equity, Real Estate                            
Principal (in shares) | shares [13],[16],[29]               21,640,936 21,640,936 21,640,936 21,640,936 21,640,936 21,640,936  
Amortized Cost [13],[29]               $ 23,700,000            
Fair Value [2],[13],[29]               $ 27,000,000.0            
Investment, Identifier [Axis]: Capital Automotive LP, Structured Mezzanine, Equity Real Estate Investment Trusts (REITs)                            
Rate, stated interest rate [8],[9],[34] 11.00% 11.00% 11.00% 11.00% 11.00% 11.00% 11.00%              
Principal Amount [9],[15],[34] $ 41,500,000                          
Amortized Cost [9],[34] 40,800,000                          
Fair Value [1],[9],[34] $ 41,500,000                          
Investment, Identifier [Axis]: Capital Automotive LP, Structured Mezzanine, Real Estate                            
Rate, stated interest rate [10],[13],[29]               11.00% 11.00% 11.00% 11.00% 11.00% 11.00%  
Principal Amount [13],[16],[29]               $ 42,400,000            
Amortized Cost [13],[29]               41,700,000            
Fair Value [2],[13],[29]               $ 42,400,000            
Investment, Identifier [Axis]: Careismatic Brands Inc, Health Care Equipment & Services 1                            
Rate, basis spread on variable rate [8],[9] 6.75% 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%              
Floor [8],[9] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [9],[15] $ 15,000,000.0                          
Amortized Cost [9] 15,000,000.0                          
Fair Value [1],[9] $ 15,000,000.0                          
Investment, Identifier [Axis]: Careismatic Brands Inc, Health Care Equipment & Services 2                            
Rate, basis spread on variable rate [8],[20] 6.75% 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%              
Floor [8],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [15],[20] $ 15,000,000.0                          
Amortized Cost [20] 15,000,000.0                          
Fair Value [1],[20] $ 15,000,000.0                          
Investment, Identifier [Axis]: Catalina Marketing Corp, Common Stock, Media & Entertainment                            
Principal (in shares) | shares [13],[28]               6,522 6,522 6,522 6,522 6,522 6,522  
Amortized Cost [13],[28]               $ 0            
Fair Value [2],[13],[28]               $ 0            
Investment, Identifier [Axis]: Cengage Learning, Inc, Common Stock, Media & Entertainment                            
Principal (in shares) | shares 227,802 [9],[33] 227,802 [9],[33] 227,802 [9],[33] 227,802 [9],[33] 227,802 [9],[33] 227,802 [9],[33] 227,802 [9],[33] 227,802 [13],[28] 227,802 [13],[28] 227,802 [13],[28] 227,802 [13],[28] 227,802 [13],[28] 227,802 [13],[28]  
Amortized Cost $ 7,500,000 [9],[33]             $ 7,600,000 [13],[28]            
Fair Value $ 3,600,000 [1],[9],[33]             $ 3,600,000 [2],[13],[28]            
Investment, Identifier [Axis]: Cimarron Energy Inc, Common Stock, Energy                            
Principal (in shares) | shares [13],[28]               4,302,293 4,302,293 4,302,293 4,302,293 4,302,293 4,302,293  
Amortized Cost [13],[28]               $ 0            
Fair Value [2],[13],[28]               $ 0            
Investment, Identifier [Axis]: Cimarron Energy Inc, Energy                            
Rate, basis spread on variable rate [10],[13],[25],[28]               9.00% 9.00% 9.00% 9.00% 9.00% 9.00%  
Floor [13],[25],[28]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [13],[16],[25],[28]               $ 7,500,000            
Amortized Cost [13],[25],[28]               4,800,000            
Fair Value [2],[13],[25],[28]               $ 3,700,000            
Investment, Identifier [Axis]: Cimarron Energy Inc, Participation Option, Energy                            
Principal (in shares) | shares [13],[28]               25,000,000 25,000,000 25,000,000 25,000,000 25,000,000 25,000,000  
Amortized Cost [13],[28]               $ 0            
Fair Value [2],[13],[28]               $ 0            
Investment, Identifier [Axis]: Circana Group (f.k.a. NPD Group), Consumer Services 1                            
Rate, basis spread on variable rate [8],[9] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%              
Floor [8],[9] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%              
Principal Amount [9],[15] $ 200,000                          
Amortized Cost [9] 200,000                          
Fair Value [1],[9] $ 200,000                          
Investment, Identifier [Axis]: Circana Group (f.k.a. NPD Group), Consumer Services 2                            
Rate, basis spread on variable rate [8],[9],[43] 3.50% 3.50% 3.50% 3.50% 3.50% 3.50% 3.50%              
Rate, PIK [8],[9],[43] 2.80% 2.80% 2.80% 2.80% 2.80% 2.80% 2.80%              
Rate, Max PIK [8],[9],[43] 2.80% 2.80% 2.80% 2.80% 2.80% 2.80% 2.80%              
Floor [8],[9],[43] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%              
Principal Amount [9],[15],[43] $ 19,400,000                          
Amortized Cost [9],[43] 19,400,000                          
Fair Value [1],[9],[43] $ 19,600,000                          
Investment, Identifier [Axis]: Circana Group (f.k.a. NPD Group), Consumer Services 3                            
Rate, basis spread on variable rate [8],[20] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%              
Floor [8],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%              
Principal Amount [15],[20] $ 800,000                          
Amortized Cost [20] 800,000                          
Fair Value [1],[20] $ 800,000                          
Investment, Identifier [Axis]: Civica Group Ltd, Software & Services 1                            
Rate, basis spread on variable rate [8],[9],[34] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%              
Rate, PIK [8],[9],[34] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%              
Rate, Max PIK [8],[9],[34] 2.10% 2.10% 2.10% 2.10% 2.10% 2.10% 2.10%              
Floor [8],[9],[34] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%              
Principal Amount | £ [9],[15],[34]         £ 17.7                  
Amortized Cost [9],[34] $ 21,800,000                          
Fair Value [1],[9],[34] $ 21,000,000.0                          
Investment, Identifier [Axis]: Civica Group Ltd, Software & Services 2                            
Rate, basis spread on variable rate [8],[9],[34] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%              
Rate, PIK [8],[9],[34] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%              
Rate, Max PIK [8],[9],[34] 2.10% 2.10% 2.10% 2.10% 2.10% 2.10% 2.10%              
Floor [8],[9],[34] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%              
Principal Amount [9],[15],[34]           $ 1.0                
Amortized Cost [9],[34] $ 600,000                          
Fair Value [1],[9],[34] $ 600,000                          
Investment, Identifier [Axis]: Civica Group Ltd, Software & Services 3                            
Rate, basis spread on variable rate [8],[20],[34] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%              
Rate, PIK [8],[20],[34] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%              
Rate, Max PIK [8],[20],[34] 2.10% 2.10% 2.10% 2.10% 2.10% 2.10% 2.10%              
Floor [8],[20],[34] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%              
Principal Amount | £ [15],[20],[34]         £ 7.5                  
Amortized Cost [20],[34] $ 9,600,000                          
Fair Value [1],[20],[34] $ 8,900,000                          
Investment, Identifier [Axis]: Clarience Technologies LLC, Capital Goods 1                            
Rate, basis spread on variable rate [10],[11],[13],[14],[21],[38],[42]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%  
Floor [11],[13],[14],[21],[38],[42]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [11],[13],[14],[16],[21],[38],[42]               $ 294,000,000.0            
Amortized Cost [11],[13],[14],[21],[38],[42]               284,600,000            
Fair Value [2],[11],[13],[14],[21],[38],[42]               $ 287,900,000            
Investment, Identifier [Axis]: Clarience Technologies LLC, Capital Goods 2                            
Rate, basis spread on variable rate [10],[19]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%  
Floor [19]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [16],[19]               $ 25,400,000            
Amortized Cost [19]               25,300,000            
Fair Value [2],[19]               $ 24,900,000            
Investment, Identifier [Axis]: Clarience Technologies LLC.                            
Rate, basis spread on variable rate [8],[9],[17],[18],[23],[37],[43] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%              
Floor [8],[9],[17],[18],[23],[37],[43] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [9],[15],[17],[18],[23],[37],[43] $ 226,100,000                          
Amortized Cost [9],[17],[18],[23],[37],[43] 221,400,000                          
Fair Value [1],[9],[17],[18],[23],[37],[43] $ 224,400,000                          
Investment, Identifier [Axis]: Clarience Technologies LLC. Capital Goods 2                            
Rate, basis spread on variable rate [8],[20] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%              
Floor [8],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [15],[20] $ 25,400,000                          
Amortized Cost [20] 25,400,000                          
Fair Value [1],[20] $ 25,300,000                          
Investment, Identifier [Axis]: Community Brands Inc, Software & Services 1                            
Rate, basis spread on variable rate 5.50% [8],[9] 5.50% [8],[9] 5.50% [8],[9] 5.50% [8],[9] 5.50% [8],[9] 5.50% [8],[9] 5.50% [8],[9] 5.75% [10],[13] 5.75% [10],[13] 5.75% [10],[13] 5.75% [10],[13] 5.75% [10],[13] 5.75% [10],[13]  
Floor 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13]  
Principal Amount $ 32,500,000 [9],[15]             $ 32,700,000 [13],[16]            
Amortized Cost 32,000,000.0 [9]             32,100,000 [13]            
Fair Value $ 31,800,000 [1],[9]             $ 31,600,000 [2],[13]            
Investment, Identifier [Axis]: Community Brands Inc, Software & Services 2                            
Rate, basis spread on variable rate 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19]  
Floor 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19]  
Principal Amount $ 3,900,000 [15],[20]             $ 3,900,000 [16],[19]            
Amortized Cost 3,800,000 [20]             3,800,000 [19]            
Fair Value $ 3,800,000 [1],[20]             $ 3,700,000 [2],[19]            
Investment, Identifier [Axis]: Community Brands Inc, Software & Services 3                            
Rate, basis spread on variable rate 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19]  
Floor 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19]  
Principal Amount $ 1,900,000 [15],[20]             $ 1,900,000 [16],[19]            
Amortized Cost 1,900,000 [20]             1,900,000 [19]            
Fair Value 1,900,000 [1],[20]             1,900,000 [2],[19]            
Investment, Identifier [Axis]: Constellis Holdings LLC                            
Fair Value 15,100,000             15,000,000.0            
Investment, Identifier [Axis]: Constellis Holdings LLC , Senior Secured Loans—Second Lien                            
Fair Value               13,500,000           12,000,000.0
Investment, Identifier [Axis]: Constellis Holdings LLC 1                            
Fair Value $ 9,500,000             $ 13,500,000            
Investment, Identifier [Axis]: Constellis Holdings LLC, Capital Goods                            
Rate, basis spread on variable rate [10],[13],[45]               11.00% 11.00% 11.00% 11.00% 11.00% 11.00%  
Rate, PIK [10],[13],[45]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%  
Rate, Max PIK [10]               5.00% 5.00% 5.00% 5.00% 5.00% 5.00%  
Floor [13],[45]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [13],[16],[45]               $ 13,500,000            
Amortized Cost [13],[45]               12,800,000            
Fair Value [2],[13],[45]               $ 13,500,000            
Investment, Identifier [Axis]: Constellis Holdings LLC, Capital Goods 1                            
Rate, basis spread on variable rate 7.75% [8],[9],[44] 7.75% [8],[9],[44] 7.75% [8],[9],[44] 7.75% [8],[9],[44] 7.75% [8],[9],[44] 7.75% [8],[9],[44] 7.75% [8],[9],[44] 7.50% [10],[13],[45] 7.50% [10],[13],[45] 7.50% [10],[13],[45] 7.50% [10],[13],[45] 7.50% [10],[13],[45] 7.50% [10],[13],[45]  
Floor 1.00% [8],[9],[44] 1.00% [8],[9],[44] 1.00% [8],[9],[44] 1.00% [8],[9],[44] 1.00% [8],[9],[44] 1.00% [8],[9],[44] 1.00% [8],[9],[44] 1.00% [13],[45] 1.00% [13],[45] 1.00% [13],[45] 1.00% [13],[45] 1.00% [13],[45] 1.00% [13],[45]  
Principal Amount $ 15,100,000 [9],[15],[44]             $ 15,000,000.0 [13],[16],[45]            
Amortized Cost 14,900,000 [9],[44]             14,400,000 [13],[45]            
Fair Value $ 15,100,000 [1],[9],[44]             15,000,000.0 [2],[13],[45]            
Investment, Identifier [Axis]: Constellis Holdings LLC, Capital Goods 2                            
Rate, basis spread on variable rate [8],[9],[44] 11.00% 11.00% 11.00% 11.00% 11.00% 11.00% 11.00%              
Rate, PIK [8],[9],[44] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%              
Rate, Max PIK [8],[9],[44] 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%              
Floor [8],[9],[44] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [9],[15],[44] $ 13,600,000                          
Amortized Cost [9],[44] 13,000,000.0                          
Fair Value [1],[9],[44] 9,500,000                          
Investment, Identifier [Axis]: Constellis Holdings LLC, Private Equity                            
Fair Value $ 0             $ 6,300,000            
Investment, Identifier [Axis]: Constellis Holdings LLC, Private Equity, Capital Goods                            
Principal (in shares) | shares 849,702 [9],[23],[33],[44] 849,702 [9],[23],[33],[44] 849,702 [9],[23],[33],[44] 849,702 [9],[23],[33],[44] 849,702 [9],[23],[33],[44] 849,702 [9],[23],[33],[44] 849,702 [9],[23],[33],[44] 849,702 [13],[21],[28],[45] 849,702 [13],[21],[28],[45] 849,702 [13],[21],[28],[45] 849,702 [13],[21],[28],[45] 849,702 [13],[21],[28],[45] 849,702 [13],[21],[28],[45]  
Amortized Cost $ 10,300,000 [9],[23],[33],[44]             $ 10,300,000 [13],[21],[28],[45]            
Fair Value $ 0 [1],[9],[23],[33],[44]             6,300,000 [2],[13],[21],[28],[45]            
Investment, Identifier [Axis]: Constellis Holdings LLC, Private Equity, Equity/Other                            
Fair Value               6,300,000           200,000
Investment, Identifier [Axis]: Constellis Holdings LLC, Senior Secured Loans—First Lien -1                            
Fair Value               $ 15,000,000.0           15,000,000.0
Investment, Identifier [Axis]: Corsearch Intermediate Inc, Software & Services                            
Rate, basis spread on variable rate [8],[9],[43] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%              
Floor [8],[9],[43] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [9],[15],[43] $ 30,100,000                          
Amortized Cost [9],[43] 28,700,000                          
Fair Value [1],[9],[43] $ 29,900,000                          
Investment, Identifier [Axis]: Corsearch Intermediate Inc, Software & Services 1                            
Rate, basis spread on variable rate [10],[13],[42]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%  
Floor [13],[42]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [13],[16],[42]               $ 30,100,000            
Amortized Cost [13],[42]               28,500,000            
Fair Value [2],[13],[42]               $ 29,800,000            
Investment, Identifier [Axis]: Corsearch Intermediate Inc, Software & Services 2                            
Rate, basis spread on variable rate [10],[19]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%  
Floor [19]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [16],[19]               $ 4,400,000            
Amortized Cost [19]               4,400,000            
Fair Value [2],[19]               4,400,000            
Investment, Identifier [Axis]: Covis Finco Sarl, Pharmaceuticals, Biotechnology & Life Sciences 2                            
Rate, basis spread on variable rate [8],[9],[34] 6.75% 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%              
Floor [8],[9],[34] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [9],[15],[34]             $ 1.8              
Amortized Cost [9],[34] $ 1,400,000                          
Fair Value [1],[9],[34] $ 1,400,000                          
Investment, Identifier [Axis]: Covis Finco Sarl, Pharmaceuticals, Biotechnology & Life Sciences 3                            
Rate, basis spread on variable rate [8],[20],[34] 6.75% 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%              
Floor [8],[20],[34] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [15],[20],[34] $ 400,000                          
Amortized Cost [20],[34] 400,000                          
Fair Value [1],[20],[34] $ 400,000                          
Investment, Identifier [Axis]: Covis Finco Sarl, Pharmaceuticals, Biotechnology & Life Sciences 1                            
Rate, basis spread on variable rate [8],[9],[34] 6.75% 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%              
Floor [8],[9],[34] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [9],[15],[34] $ 19,600,000                          
Amortized Cost [9],[34] 19,600,000                          
Fair Value [1],[9],[34] $ 19,600,000                          
Investment, Identifier [Axis]: Covis Finco Sarl, Pharmaceuticals, Biotechnology & Life Sciences 4                            
Rate, basis spread on variable rate [8],[20],[34] 6.75% 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%              
Floor [8],[20],[34] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [15],[20],[34]             $ 2.2              
Amortized Cost [20],[34] $ 1,600,000                          
Fair Value [1],[20],[34] 1,700,000                          
Investment, Identifier [Axis]: Credit Opportunities Partners JV, LLC                            
Fair Value 1,403,200,000             1,428,300,000            
Investment, Identifier [Axis]: Credit Opportunities Partners JV, LLC 2                            
Fair Value               1,428,300,000           1,396,200,000
Investment, Identifier [Axis]: Credit Opportunities Partners JV, LLC, Credit Opportunities Partners JV, LLC                            
Principal Amount [9],[15],[34],[35] 1,637,300,000                          
Amortized Cost [9],[34],[35] 1,571,700,000                          
Fair Value [1],[9],[34],[35] $ 1,403,200,000                          
Investment, Identifier [Axis]: Credit Opportunities Partners JV, LLC, Diversified Financials                            
Principal Amount [13],[16],[29],[36]               1,637,300,000            
Amortized Cost [13],[29],[36]               1,571,700,000            
Fair Value [2],[13],[29],[36]               $ 1,428,300,000            
Investment, Identifier [Axis]: Cubic Corp, Preferred Stock, Software & Services                            
Rate, PIK 11.00% [8],[9] 11.00% [8],[9] 11.00% [8],[9] 11.00% [8],[9] 11.00% [8],[9] 11.00% [8],[9] 11.00% [8],[9] 11.00% [10],[13] 11.00% [10],[13] 11.00% [10],[13] 11.00% [10],[13] 11.00% [10],[13] 11.00% [10],[13]  
Rate, Max PIK 11.00% [8],[9] 11.00% [8],[9] 11.00% [8],[9] 11.00% [8],[9] 11.00% [8],[9] 11.00% [8],[9] 11.00% [8],[9] 11.00% [10],[13] 11.00% [10],[13] 11.00% [10],[13] 11.00% [10],[13] 11.00% [10],[13] 11.00% [10],[13]  
Principal (in shares) | shares 42,141,600 [9] 42,141,600 [9] 42,141,600 [9] 42,141,600 [9] 42,141,600 [9] 42,141,600 [9] 42,141,600 [9] 42,141,600 [13] 42,141,600 [13] 42,141,600 [13] 42,141,600 [13] 42,141,600 [13] 42,141,600 [13]  
Amortized Cost $ 39,700,000 [9]             $ 39,800,000 [13]            
Fair Value $ 33,500,000 [1],[9]             $ 34,700,000 [2],[13]            
Investment, Identifier [Axis]: Cubic Corp, Software & Services                            
Rate, basis spread on variable rate 7.63% [8],[9] 7.63% [8],[9] 7.63% [8],[9] 7.63% [8],[9] 7.63% [8],[9] 7.63% [8],[9] 7.63% [8],[9] 7.63% [10],[13] 7.63% [10],[13] 7.63% [10],[13] 7.63% [10],[13] 7.63% [10],[13] 7.63% [10],[13]  
Floor 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13]  
Principal Amount $ 44,800,000 [9],[15]             $ 44,800,000 [13],[16]            
Amortized Cost 42,400,000 [9]             42,200,000 [13]            
Fair Value $ 43,200,000 [1],[9]             $ 40,600,000 [2],[13]            
Investment, Identifier [Axis]: DOC Generici Srl, Pharmaceuticals, Biotechnology & Life Sciences 1                            
Rate, basis spread on variable rate 6.50% [8],[9],[34] 6.50% [8],[9],[34] 6.50% [8],[9],[34] 6.50% [8],[9],[34] 6.50% [8],[9],[34] 6.50% [8],[9],[34] 6.50% [8],[9],[34] 6.50% [10],[13],[29] 6.50% [10],[13],[29] 6.50% [10],[13],[29] 6.50% [10],[13],[29] 6.50% [10],[13],[29] 6.50% [10],[13],[29]  
Floor 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [13],[29] 0.00% [13],[29] 0.00% [13],[29] 0.00% [13],[29] 0.00% [13],[29] 0.00% [13],[29]  
Principal Amount | €   € 23.1 [9],[15],[34]             € 23.1 [13],[16],[29]          
Amortized Cost $ 22,600,000 [9],[34]             $ 22,500,000 [13],[29]            
Fair Value $ 24,100,000 [1],[9],[34]             $ 24,100,000 [2],[13],[29]            
Investment, Identifier [Axis]: DOC Generici Srl, Pharmaceuticals, Biotechnology & Life Sciences 2                            
Rate, basis spread on variable rate 6.50% [8],[20],[34] 6.50% [8],[20],[34] 6.50% [8],[20],[34] 6.50% [8],[20],[34] 6.50% [8],[20],[34] 6.50% [8],[20],[34] 6.50% [8],[20],[34] 6.50% [10],[19],[29] 6.50% [10],[19],[29] 6.50% [10],[19],[29] 6.50% [10],[19],[29] 6.50% [10],[19],[29] 6.50% [10],[19],[29]  
Floor 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [19],[29] 0.00% [19],[29] 0.00% [19],[29] 0.00% [19],[29] 0.00% [19],[29] 0.00% [19],[29]  
Principal Amount | €   € 2.4 [15],[20],[34]             € 2.4 [16],[19],[29]          
Amortized Cost $ 2,300,000 [20],[34]             $ 2,300,000 [19],[29]            
Fair Value $ 2,400,000 [1],[20],[34]             $ 2,200,000 [2],[19],[29]            
Investment, Identifier [Axis]: Dental Care Alliance Inc, Health Care Equipment & Services 1                            
Rate, basis spread on variable rate [10],[11],[13],[21],[22],[42]               6.41% 6.41% 6.41% 6.41% 6.41% 6.41%  
Floor [11],[13],[21],[22],[42]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%  
Principal Amount [11],[13],[16],[21],[22],[42]               $ 135,400,000            
Amortized Cost [11],[13],[21],[22],[42]               131,700,000            
Fair Value [2],[11],[13],[21],[22],[42]               $ 132,700,000            
Investment, Identifier [Axis]: Dental Care Alliance Inc, Health Care Equipment & Services 2                            
Rate, basis spread on variable rate [10],[19]               6.41% 6.41% 6.41% 6.41% 6.41% 6.41%  
Floor [19]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%  
Principal Amount [16],[19]               $ 1,700,000            
Amortized Cost [19]               1,700,000            
Fair Value [2],[19]               $ 1,600,000            
Investment, Identifier [Axis]: Dental Care Alliance Inc,Health Care Equipment & Services                            
Rate, basis spread on variable rate [8],[9],[18],[24],[43] 6.41% 6.41% 6.41% 6.41% 6.41% 6.41% 6.41%              
Floor [8],[9],[18],[24],[43] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%              
Principal Amount [9],[15],[18],[24],[43] $ 111,200,000                          
Amortized Cost [9],[18],[24],[43] 108,500,000                          
Fair Value [1],[9],[18],[24],[43] $ 109,600,000                          
Investment, Identifier [Axis]: Drive Revel, Private Equity, Financial Services                            
Principal (in shares) | shares [9],[13],[15],[28],[29],[33],[34] 1,853,796 1,853,796 1,853,796 1,853,796 1,853,796 1,853,796 1,853,796              
Amortized Cost [9],[13],[28],[29],[33],[34] $ 2,000,000.0                          
Fair Value [1],[9],[13],[28],[29],[33],[34] $ 2,000,000.0                          
Investment, Identifier [Axis]: Element Materials Technology Group US Holdings Inc, Commercial & Professional Services                            
Rate, PIK [8],[9],[34] 8.50% 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%              
Rate, Max PIK [8],[9],[34] 8.50% 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%              
Floor [8],[9],[34] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%              
Principal Amount [9],[15],[34] $ 74,900,000                          
Amortized Cost [9],[34] 73,700,000                          
Fair Value [1],[9],[34] $ 70,400,000                          
Investment, Identifier [Axis]: Element Materials Technology Group US Holdings Inc, Commercial & Professional Services 1                            
Rate, basis spread on variable rate 4.25% [8],[34],[40],[43] 4.25% [8],[34],[40],[43] 4.25% [8],[34],[40],[43] 4.25% [8],[34],[40],[43] 4.25% [8],[34],[40],[43] 4.25% [8],[34],[40],[43] 4.25% [8],[34],[40],[43] 4.25% [10],[13],[29],[41] 4.25% [10],[13],[29],[41] 4.25% [10],[13],[29],[41] 4.25% [10],[13],[29],[41] 4.25% [10],[13],[29],[41] 4.25% [10],[13],[29],[41]  
Floor 0.50% [8],[34],[40],[43] 0.50% [8],[34],[40],[43] 0.50% [8],[34],[40],[43] 0.50% [8],[34],[40],[43] 0.50% [8],[34],[40],[43] 0.50% [8],[34],[40],[43] 0.50% [8],[34],[40],[43] 0.00% [13],[29],[41] 0.00% [13],[29],[41] 0.00% [13],[29],[41] 0.00% [13],[29],[41] 0.00% [13],[29],[41] 0.00% [13],[29],[41]  
Principal Amount $ 1,400,000 [15],[34],[40],[43]               € 0.3 [13],[16],[29],[41]          
Amortized Cost 1,400,000 [34],[40],[43]             $ 400,000 [13],[29],[41]            
Fair Value $ 1,400,000 [1],[34],[40],[43]             $ 400,000 [2],[13],[29],[41]            
Investment, Identifier [Axis]: Element Materials Technology Group US Holdings Inc, Commercial & Professional Services 2                            
Rate, basis spread on variable rate 4.25% [8],[9],[34],[40] 4.25% [8],[9],[34],[40] 4.25% [8],[9],[34],[40] 4.25% [8],[9],[34],[40] 4.25% [8],[9],[34],[40] 4.25% [8],[9],[34],[40] 4.25% [8],[9],[34],[40] 4.25% [10],[13],[29],[41] 4.25% [10],[13],[29],[41] 4.25% [10],[13],[29],[41] 4.25% [10],[13],[29],[41] 4.25% [10],[13],[29],[41] 4.25% [10],[13],[29],[41]  
Floor 0.00% [8],[9],[34],[40] 0.00% [8],[9],[34],[40] 0.00% [8],[9],[34],[40] 0.00% [8],[9],[34],[40] 0.00% [8],[9],[34],[40] 0.00% [8],[9],[34],[40] 0.00% [8],[9],[34],[40] 0.50% [13],[29],[41] 0.50% [13],[29],[41] 0.50% [13],[29],[41] 0.50% [13],[29],[41] 0.50% [13],[29],[41] 0.50% [13],[29],[41]  
Principal Amount   € 0.3 [9],[15],[34],[40]           $ 1,400,000 [13],[16],[29],[41]            
Amortized Cost $ 400,000 [9],[34],[40]             1,400,000 [13],[29],[41]            
Fair Value $ 400,000 [1],[9],[34],[40]             $ 1,400,000 [2],[13],[29],[41]            
Investment, Identifier [Axis]: Element Materials Technology Group US Holdings Inc, Commercial & Professional Services 3                            
Rate, PIK [10],[13],[29]               8.50% 8.50% 8.50% 8.50% 8.50% 8.50%  
Rate, Max PIK [10],[13],[29]               8.50% 8.50% 8.50% 8.50% 8.50% 8.50%  
Floor [13],[29]               0.50% 0.50% 0.50% 0.50% 0.50% 0.50%  
Principal Amount [13],[16],[29]               $ 67,900,000            
Amortized Cost [13],[29]               66,500,000            
Fair Value [2],[13],[29]               $ 64,600,000            
Investment, Identifier [Axis]: Ellucian Inc, Software & Services                            
Rate, basis spread on variable rate 8.00% [8],[9] 8.00% [8],[9] 8.00% [8],[9] 8.00% [8],[9] 8.00% [8],[9] 8.00% [8],[9] 8.00% [8],[9] 8.00% [10],[13] 8.00% [10],[13] 8.00% [10],[13] 8.00% [10],[13] 8.00% [10],[13] 8.00% [10],[13]  
Floor 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13]  
Principal Amount $ 179,200,000 [9],[15]             $ 179,200,000 [13],[16]            
Amortized Cost 171,800,000 [9]             170,900,000 [13]            
Fair Value $ 181,000,000.0 [1],[9]             $ 177,500,000 [2],[13]            
Investment, Identifier [Axis]: Encora Digital Inc, Software & Services 1                            
Rate, basis spread on variable rate [10],[13]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%  
Rate, PIK [10],[13]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%  
Rate, Max PIK [10],[13]               2.40% 2.40% 2.40% 2.40% 2.40% 2.40%  
Floor [13]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%  
Principal Amount [13],[16]               $ 65,100,000            
Amortized Cost [13]               63,900,000            
Fair Value [2],[13]               $ 61,700,000            
Investment, Identifier [Axis]: Encora Digital Inc, Software & Services 2                            
Rate, basis spread on variable rate [10],[19]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%  
Floor [19]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%  
Principal Amount [16],[19]               $ 19,600,000            
Amortized Cost [19]               19,400,000            
Fair Value [2],[19]               $ 18,600,000            
Investment, Identifier [Axis]: Encora Digital Inc, Software & Services 3                            
Rate, PIK [10],[13]               9.80% 9.80% 9.80% 9.80% 9.80% 9.80%  
Rate, Max PIK [10],[13]               9.80% 9.80% 9.80% 9.80% 9.80% 9.80%  
Principal Amount [13],[16]               $ 23,800,000            
Amortized Cost [13]               23,200,000            
Fair Value [2],[13]               $ 22,600,000            
Investment, Identifier [Axis]: Encora Digital LLC, Commercial & Professional Services                            
Rate, PIK [8],[9] 9.80% 9.80% 9.80% 9.80% 9.80% 9.80% 9.80%              
Rate, Max PIK [8],[9] 9.80% 9.80% 9.80% 9.80% 9.80% 9.80% 9.80%              
Principal Amount [9],[15] $ 24,900,000                          
Amortized Cost [9] 24,400,000                          
Fair Value [1],[9] $ 23,700,000                          
Investment, Identifier [Axis]: Encora Digital LLC, Commercial & Professional Services 1                            
Rate, basis spread on variable rate [8],[9] 5.08% 5.08% 5.08% 5.08% 5.08% 5.08% 5.08%              
Floor [8],[9] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%              
Principal Amount [9],[15] $ 19,600,000                          
Amortized Cost [9] 19,300,000                          
Fair Value [1],[9] $ 19,300,000                          
Investment, Identifier [Axis]: Encora Digital LLC, Commercial & Professional Services 2                            
Rate, basis spread on variable rate [8],[9] 5.08% 5.08% 5.08% 5.08% 5.08% 5.08% 5.08%              
Rate, PIK [8],[9] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%              
Rate, Max PIK [8],[9] 2.30% 2.30% 2.30% 2.30% 2.30% 2.30% 2.30%              
Floor [8],[9] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%              
Principal Amount [9],[15] $ 65,100,000                          
Amortized Cost [9] 64,100,000                          
Fair Value [1],[9] $ 64,100,000                          
Investment, Identifier [Axis]: Envigo Laboratories Inc, Series A Warrant, Health Care Equipment & Services                            
Principal (in shares) | shares [28],[38]               10,924 10,924 10,924 10,924 10,924 10,924  
Amortized Cost [28],[38]               $ 0            
Fair Value [2],[28],[38]               $ 0            
Investment, Identifier [Axis]: Envigo Laboratories Inc, Series B Warrant, Health Care Equipment & Services                            
Principal (in shares) | shares [28],[38]               17,515 17,515 17,515 17,515 17,515 17,515  
Amortized Cost [28],[38]               $ 0            
Fair Value [2],[28],[38]               $ 0            
Investment, Identifier [Axis]: Envirotainer Ltd, Transportation                            
Rate, basis spread on variable rate 5.75% [8],[20],[34] 5.75% [8],[20],[34] 5.75% [8],[20],[34] 5.75% [8],[20],[34] 5.75% [8],[20],[34] 5.75% [8],[20],[34] 5.75% [8],[20],[34] 6.00% [10],[19],[29] 6.00% [10],[19],[29] 6.00% [10],[19],[29] 6.00% [10],[19],[29] 6.00% [10],[19],[29] 6.00% [10],[19],[29]  
Rate, PIK 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [10],[19],[29] 0.00% [10],[19],[29] 0.00% [10],[19],[29] 0.00% [10],[19],[29] 0.00% [10],[19],[29] 0.00% [10],[19],[29]  
Rate, Max PIK 3.00% [8],[20],[34] 3.00% [8],[20],[34] 3.00% [8],[20],[34] 3.00% [8],[20],[34] 3.00% [8],[20],[34] 3.00% [8],[20],[34] 3.00% [8],[20],[34] 3.00% [10],[19],[29] 3.00% [10],[19],[29] 3.00% [10],[19],[29] 3.00% [10],[19],[29] 3.00% [10],[19],[29] 3.00% [10],[19],[29]  
Floor 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [19],[29] 0.00% [19],[29] 0.00% [19],[29] 0.00% [19],[29] 0.00% [19],[29] 0.00% [19],[29]  
Principal Amount | €   € 2.7 [15],[20],[34]             € 2.7 [16],[19],[29]          
Amortized Cost $ 2,700,000 [20],[34]             $ 2,700,000 [19],[29]            
Fair Value $ 2,700,000 [1],[20],[34]             $ 2,600,000 [2],[19],[29]            
Investment, Identifier [Axis]: Excelitas Technologies Corp, Technology Hardware & Equipment 1                            
Rate, basis spread on variable rate 5.75% [8],[9] 5.75% [8],[9] 5.75% [8],[9] 5.75% [8],[9] 5.75% [8],[9] 5.75% [8],[9] 5.75% [8],[9] 5.75% [10],[13] 5.75% [10],[13] 5.75% [10],[13] 5.75% [10],[13] 5.75% [10],[13] 5.75% [10],[13]  
Floor 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13]  
Principal Amount $ 1,400,000 [9],[15]             $ 1,300,000 [13],[16]            
Amortized Cost 1,400,000 [9]             1,300,000 [13]            
Fair Value $ 1,400,000 [1],[9]             $ 1,300,000 [2],[13]            
Investment, Identifier [Axis]: Excelitas Technologies Corp, Technology Hardware & Equipment 2                            
Rate, basis spread on variable rate 5.75% [8],[9] 5.75% [8],[9] 5.75% [8],[9] 5.75% [8],[9] 5.75% [8],[9] 5.75% [8],[9] 5.75% [8],[9] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19]  
Floor 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19]  
Principal Amount $ 1,600,000 [9],[15]             $ 1,000,000.0 [16],[19]            
Amortized Cost 1,600,000 [9]             1,000,000.0 [19]            
Fair Value $ 1,600,000 [1],[9]             $ 1,000,000.0 [2],[19]            
Investment, Identifier [Axis]: Excelitas Technologies Corp, Technology Hardware & Equipment 3                            
Rate, basis spread on variable rate 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19]  
Floor 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19]  
Principal Amount $ 1,000,000.0 [15],[20]             $ 4,700,000 [16],[19]            
Amortized Cost 1,000,000.0 [20]             4,700,000 [19]            
Fair Value $ 1,000,000.0 [1],[20]             4,600,000 [2],[19]            
Investment, Identifier [Axis]: Excelitas Technologies Corp, Technology Hardware & Equipment 4                            
Rate, basis spread on variable rate [8],[20] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%              
Floor [8],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%              
Principal Amount [15],[20] $ 3,100,000                          
Amortized Cost [20] 3,100,000                          
Fair Value [1],[20] $ 3,000,000.0                          
Investment, Identifier [Axis]: Fairway Group Holdings Corp 2, Senior Secured Loans—First Lien -1                            
Fair Value               0           0
Investment, Identifier [Axis]: Fairway Group Holdings Corp, Common Stock, Equity/Other                            
Fair Value               0           0
Investment, Identifier [Axis]: Fairway Group Holdings Corp, Senior Secured Loans—First Lien -2                            
Fair Value               $ 0           700,000
Investment, Identifier [Axis]: Follett Software Co, Software & Services 1                            
Rate, basis spread on variable rate 5.75% [8],[18],[23],[24] 5.75% [8],[18],[23],[24] 5.75% [8],[18],[23],[24] 5.75% [8],[18],[23],[24] 5.75% [8],[18],[23],[24] 5.75% [8],[18],[23],[24] 5.75% [8],[18],[23],[24] 5.75% [10],[11],[12],[21],[22] 5.75% [10],[11],[12],[21],[22] 5.75% [10],[11],[12],[21],[22] 5.75% [10],[11],[12],[21],[22] 5.75% [10],[11],[12],[21],[22] 5.75% [10],[11],[12],[21],[22]  
Floor 0.80% [8],[18],[23],[24] 0.80% [8],[18],[23],[24] 0.80% [8],[18],[23],[24] 0.80% [8],[18],[23],[24] 0.80% [8],[18],[23],[24] 0.80% [8],[18],[23],[24] 0.80% [8],[18],[23],[24] 0.80% [11],[12],[21],[22] 0.80% [11],[12],[21],[22] 0.80% [11],[12],[21],[22] 0.80% [11],[12],[21],[22] 0.80% [11],[12],[21],[22] 0.80% [11],[12],[21],[22]  
Principal Amount $ 73,100,000 [15],[18],[23],[24]             $ 73,700,000 [11],[12],[16],[21],[22]            
Amortized Cost 72,600,000 [18],[23],[24]             73,100,000 [11],[12],[21],[22]            
Fair Value $ 72,600,000 [1],[18],[23],[24]             $ 72,100,000 [2],[11],[12],[21],[22]            
Investment, Identifier [Axis]: Follett Software Co, Software & Services 2                            
Rate, basis spread on variable rate 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19]  
Floor 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19]  
Principal Amount $ 9,900,000 [15],[20]             $ 9,900,000 [16],[19]            
Amortized Cost 9,900,000 [20]             9,900,000 [19]            
Fair Value $ 9,800,000 [1],[20]             $ 9,700,000 [2],[19]            
Investment, Identifier [Axis]: Foundation Consumer Brands LLC, Pharmaceuticals, Biotechnology & Life Sciences 1                            
Rate, basis spread on variable rate 6.25% [8],[9],[23],[43] 6.25% [8],[9],[23],[43] 6.25% [8],[9],[23],[43] 6.25% [8],[9],[23],[43] 6.25% [8],[9],[23],[43] 6.25% [8],[9],[23],[43] 6.25% [8],[9],[23],[43] 5.50% [10],[13],[21],[42] 5.50% [10],[13],[21],[42] 5.50% [10],[13],[21],[42] 5.50% [10],[13],[21],[42] 5.50% [10],[13],[21],[42] 5.50% [10],[13],[21],[42]  
Floor 1.00% [8],[9],[23],[43] 1.00% [8],[9],[23],[43] 1.00% [8],[9],[23],[43] 1.00% [8],[9],[23],[43] 1.00% [8],[9],[23],[43] 1.00% [8],[9],[23],[43] 1.00% [8],[9],[23],[43] 1.00% [13],[21],[42] 1.00% [13],[21],[42] 1.00% [13],[21],[42] 1.00% [13],[21],[42] 1.00% [13],[21],[42] 1.00% [13],[21],[42]  
Principal Amount $ 80,000,000.0 [9],[15],[23],[43]             $ 83,900,000 [13],[16],[21],[42]            
Amortized Cost 77,100,000 [9],[23],[43]             80,500,000 [13],[21],[42]            
Fair Value $ 80,000,000.0 [1],[9],[23],[43]             $ 84,700,000 [2],[13],[21],[42]            
Investment, Identifier [Axis]: Foundation Consumer Brands LLC, Pharmaceuticals, Biotechnology & Life Sciences 2                            
Rate, basis spread on variable rate 6.25% [8],[20] 6.25% [8],[20] 6.25% [8],[20] 6.25% [8],[20] 6.25% [8],[20] 6.25% [8],[20] 6.25% [8],[20] 5.50% [10],[19] 5.50% [10],[19] 5.50% [10],[19] 5.50% [10],[19] 5.50% [10],[19] 5.50% [10],[19]  
Floor 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19]  
Principal Amount $ 6,600,000 [15],[20]             $ 6,600,000 [16],[19]            
Amortized Cost 6,600,000 [20]             6,600,000 [19]            
Fair Value $ 6,600,000 [1],[20]             $ 6,600,000 [2],[19]            
Investment, Identifier [Axis]: Foundation Risk Partners Corp, Insurance 1                            
Rate, basis spread on variable rate 6.00% [8],[9],[43] 6.00% [8],[9],[43] 6.00% [8],[9],[43] 6.00% [8],[9],[43] 6.00% [8],[9],[43] 6.00% [8],[9],[43] 6.00% [8],[9],[43] 6.25% [10],[13] 6.25% [10],[13] 6.25% [10],[13] 6.25% [10],[13] 6.25% [10],[13] 6.25% [10],[13]  
Floor 0.80% [8],[9],[43] 0.80% [8],[9],[43] 0.80% [8],[9],[43] 0.80% [8],[9],[43] 0.80% [8],[9],[43] 0.80% [8],[9],[43] 0.80% [8],[9],[43] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13]  
Principal Amount $ 54,400,000 [9],[15],[43]             $ 2,900,000 [13],[16]            
Amortized Cost 53,700,000 [9],[43]             2,800,000 [13]            
Fair Value $ 53,500,000 [1],[9],[43]             $ 2,800,000 [2],[13]            
Investment, Identifier [Axis]: Foundation Risk Partners Corp, Insurance 2                            
Rate, basis spread on variable rate 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [10],[13],[42] 6.00% [10],[13],[42] 6.00% [10],[13],[42] 6.00% [10],[13],[42] 6.00% [10],[13],[42] 6.00% [10],[13],[42]  
Floor 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [13],[42] 0.80% [13],[42] 0.80% [13],[42] 0.80% [13],[42] 0.80% [13],[42] 0.80% [13],[42]  
Principal Amount $ 7,000,000.0 [15],[20]             $ 79,900,000 [13],[16],[42]            
Amortized Cost 6,900,000 [20]             78,800,000 [13],[42]            
Fair Value $ 6,900,000 [1],[20]             $ 78,100,000 [2],[13],[42]            
Investment, Identifier [Axis]: Foundation Risk Partners Corp, Insurance 3                            
Rate, basis spread on variable rate [10],[19]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%  
Floor [19]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%  
Principal Amount [16],[19]               $ 4,100,000            
Amortized Cost [19]               4,100,000            
Fair Value [2],[19]               $ 4,000,000.0            
Investment, Identifier [Axis]: Fox Head Inc, Common Stock, Consumer Durables & Apparel                            
Principal (in shares) | shares 10,000,000 [9],[55] 10,000,000 [9],[55] 10,000,000 [9],[55] 10,000,000 [9],[55] 10,000,000 [9],[55] 10,000,000 [9],[55] 10,000,000 [9],[55] 10,000,000 [13],[28] 10,000,000 [13],[28] 10,000,000 [13],[28] 10,000,000 [13],[28] 10,000,000 [13],[28] 10,000,000 [13],[28]  
Amortized Cost $ 2,900,000 [9],[55]             $ 2,900,000 [13],[28]            
Fair Value 0 [1],[9],[55]             0 [2],[13],[28]            
Investment, Identifier [Axis]: Fronton BV, Common Stock                            
Fair Value $ 1,700,000             $ 1,000,000.0            
Investment, Identifier [Axis]: Fronton BV, Common Stock, Consumer Services                            
Principal (in shares) | shares 14,943 [33],[44],[56] 14,943 [33],[44],[56] 14,943 [33],[44],[56] 14,943 [33],[44],[56] 14,943 [33],[44],[56] 14,943 [33],[44],[56] 14,943 [33],[44],[56] 14,943 [28],[45],[57] 14,943 [28],[45],[57] 14,943 [28],[45],[57] 14,943 [28],[45],[57] 14,943 [28],[45],[57] 14,943 [28],[45],[57]  
Amortized Cost $ 0 [33],[44],[56]             $ 0 [28],[45],[57]            
Fair Value $ 1,700,000 [1],[33],[44],[56]             1,000,000.0 [2],[28],[45],[57]            
Investment, Identifier [Axis]: Fruits Bidco, Food, Beverage & Tobacco 1                            
Rate, basis spread on variable rate [8],[9],[34] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%              
Floor [8],[9],[34] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%              
Principal Amount | € [9],[15],[34]   € 7.4                        
Amortized Cost [9],[34] $ 7,800,000                          
Fair Value [1],[9],[34] $ 7,600,000                          
Investment, Identifier [Axis]: Fruits Bidco, Food, Beverage & Tobacco 2                            
Rate, basis spread on variable rate [8],[9],[34] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%              
Floor [8],[9],[34] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%              
Principal Amount [9],[15],[34] $ 33,000,000.0                          
Amortized Cost [9],[34] 32,100,000                          
Fair Value [1],[9],[34] 32,300,000                          
Investment, Identifier [Axis]: Galaxy Universal LLC                            
Fair Value 7,500,000             0            
Investment, Identifier [Axis]: Galaxy Universal LLC 2                            
Fair Value 86,200,000             0            
Investment, Identifier [Axis]: Galaxy Universal LLC 3                            
Fair Value 17,900,000             0            
Investment, Identifier [Axis]: Galaxy Universal LLC, Common Stock                            
Fair Value $ 400,000             $ 0            
Investment, Identifier [Axis]: Galaxy Universal LLC, Common Stock, Consumer Durables & Apparel                            
Principal (in shares) | shares 228,806 [33],[44],[51] 228,806 [33],[44],[51] 228,806 [33],[44],[51] 228,806 [33],[44],[51] 228,806 [33],[44],[51] 228,806 [33],[44],[51] 228,806 [33],[44],[51] 228,806 [28],[52] 228,806 [28],[52] 228,806 [28],[52] 228,806 [28],[52] 228,806 [28],[52] 228,806 [28],[52]  
Amortized Cost $ 35,400,000 [33],[44],[51]             $ 35,400,000 [28],[52]            
Fair Value $ 400,000 [1],[33],[44],[51]             $ 7,500,000 [2],[28],[52]            
Investment, Identifier [Axis]: Galaxy Universal LLC, Consumer Durables & Apparel 1                            
Rate, basis spread on variable rate 5.75% [8],[9],[44] 5.75% [8],[9],[44] 5.75% [8],[9],[44] 5.75% [8],[9],[44] 5.75% [8],[9],[44] 5.75% [8],[9],[44] 5.75% [8],[9],[44] 5.75% [10],[13] 5.75% [10],[13] 5.75% [10],[13] 5.75% [10],[13] 5.75% [10],[13] 5.75% [10],[13]  
Floor 1.00% [8],[9],[44] 1.00% [8],[9],[44] 1.00% [8],[9],[44] 1.00% [8],[9],[44] 1.00% [8],[9],[44] 1.00% [8],[9],[44] 1.00% [8],[9],[44] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13]  
Principal Amount $ 7,500,000 [9],[15],[44]             $ 7,500,000 [13],[16]            
Amortized Cost 7,500,000 [9],[44]             7,500,000 [13]            
Fair Value $ 7,500,000 [1],[9],[44]             $ 7,500,000 [2],[13]            
Investment, Identifier [Axis]: Galaxy Universal LLC, Consumer Durables & Apparel 2                            
Rate, basis spread on variable rate 5.75% [8],[9],[44] 5.75% [8],[9],[44] 5.75% [8],[9],[44] 5.75% [8],[9],[44] 5.75% [8],[9],[44] 5.75% [8],[9],[44] 5.75% [8],[9],[44] 5.75% [10],[13] 5.75% [10],[13] 5.75% [10],[13] 5.75% [10],[13] 5.75% [10],[13] 5.75% [10],[13]  
Floor 1.00% [8],[9],[44] 1.00% [8],[9],[44] 1.00% [8],[9],[44] 1.00% [8],[9],[44] 1.00% [8],[9],[44] 1.00% [8],[9],[44] 1.00% [8],[9],[44] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13]  
Principal Amount $ 87,400,000 [9],[15],[44]             $ 88,000,000.0 [13],[16]            
Amortized Cost 87,400,000 [9],[44]             88,000,000.0 [13]            
Fair Value $ 86,200,000 [1],[9],[44]             $ 85,300,000 [2],[13]            
Investment, Identifier [Axis]: Galaxy Universal LLC, Consumer Durables & Apparel 3                            
Rate, basis spread on variable rate 5.00% [8],[9],[44] 5.00% [8],[9],[44] 5.00% [8],[9],[44] 5.00% [8],[9],[44] 5.00% [8],[9],[44] 5.00% [8],[9],[44] 5.00% [8],[9],[44] 5.00% [10],[13] 5.00% [10],[13] 5.00% [10],[13] 5.00% [10],[13] 5.00% [10],[13] 5.00% [10],[13]  
Floor 1.00% [8],[9],[44] 1.00% [8],[9],[44] 1.00% [8],[9],[44] 1.00% [8],[9],[44] 1.00% [8],[9],[44] 1.00% [8],[9],[44] 1.00% [8],[9],[44] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13]  
Principal Amount $ 18,300,000 [9],[15],[44]             $ 21,500,000 [13],[16]            
Amortized Cost 18,200,000 [9],[44]             21,400,000 [13]            
Fair Value 17,900,000 [1],[9],[44]             21,200,000 [2],[13]            
Investment, Identifier [Axis]: Galaxy Universal LLC, Preferred Stock                            
Fair Value $ 5,100,000             0            
Investment, Identifier [Axis]: Galaxy Universal LLC, Preferred Stock, Consumer Durables & Apparel                            
Rate, PIK [8],[44],[51] 15.90% 15.90% 15.90% 15.90% 15.90% 15.90% 15.90%              
Rate, Max PIK [8],[44],[51] 15.90% 15.90% 15.90% 15.90% 15.90% 15.90% 15.90%              
Principal (in shares) | shares [44],[51] 2,068,400 2,068,400 2,068,400 2,068,400 2,068,400 2,068,400 2,068,400              
Amortized Cost [44],[51] $ 4,000,000.0                          
Fair Value [1],[44],[51] 5,100,000                          
Investment, Identifier [Axis]: Galaxy Universal LLC, Trade Claim                            
Fair Value $ 1,000,000.0             $ 0            
Investment, Identifier [Axis]: Galaxy Universal LLC, Trade Claim, Consumer Durables & Apparel                            
Principal (in shares) | shares 7,701,195 [9],[33],[44] 7,701,195 [9],[33],[44] 7,701,195 [9],[33],[44] 7,701,195 [9],[33],[44] 7,701,195 [9],[33],[44] 7,701,195 [9],[33],[44] 7,701,195 [9],[33],[44] 7,701,195 [13],[28] 7,701,195 [13],[28] 7,701,195 [13],[28] 7,701,195 [13],[28] 7,701,195 [13],[28] 7,701,195 [13],[28]  
Amortized Cost $ 2,800,000 [9],[33],[44]             $ 4,600,000 [13],[28]            
Fair Value $ 1,000,000.0 [1],[9],[33],[44]             $ 1,700,000 [2],[13],[28]            
Investment, Identifier [Axis]: Galway Partners Holdings LLC, Insurance 1                            
Rate, basis spread on variable rate 5.25% [8],[9],[18],[24],[43] 5.25% [8],[9],[18],[24],[43] 5.25% [8],[9],[18],[24],[43] 5.25% [8],[9],[18],[24],[43] 5.25% [8],[9],[18],[24],[43] 5.25% [8],[9],[18],[24],[43] 5.25% [8],[9],[18],[24],[43] 5.25% [10],[11],[12],[13],[22],[42] 5.25% [10],[11],[12],[13],[22],[42] 5.25% [10],[11],[12],[13],[22],[42] 5.25% [10],[11],[12],[13],[22],[42] 5.25% [10],[11],[12],[13],[22],[42] 5.25% [10],[11],[12],[13],[22],[42]  
Rate, PIK 0.00% [8],[9],[18],[24],[43] 0.00% [8],[9],[18],[24],[43] 0.00% [8],[9],[18],[24],[43] 0.00% [8],[9],[18],[24],[43] 0.00% [8],[9],[18],[24],[43] 0.00% [8],[9],[18],[24],[43] 0.00% [8],[9],[18],[24],[43] 0.00% [10],[11],[12],[13],[22],[42] 0.00% [10],[11],[12],[13],[22],[42] 0.00% [10],[11],[12],[13],[22],[42] 0.00% [10],[11],[12],[13],[22],[42] 0.00% [10],[11],[12],[13],[22],[42] 0.00% [10],[11],[12],[13],[22],[42]  
Rate, Max PIK 1.30% [8],[9],[18],[24],[43] 1.30% [8],[9],[18],[24],[43] 1.30% [8],[9],[18],[24],[43] 1.30% [8],[9],[18],[24],[43] 1.30% [8],[9],[18],[24],[43] 1.30% [8],[9],[18],[24],[43] 1.30% [8],[9],[18],[24],[43] 1.30% [10],[11],[12],[13],[22],[42] 1.30% [10],[11],[12],[13],[22],[42] 1.30% [10],[11],[12],[13],[22],[42] 1.30% [10],[11],[12],[13],[22],[42] 1.30% [10],[11],[12],[13],[22],[42] 1.30% [10],[11],[12],[13],[22],[42]  
Floor 0.80% [8],[9],[18],[24],[43] 0.80% [8],[9],[18],[24],[43] 0.80% [8],[9],[18],[24],[43] 0.80% [8],[9],[18],[24],[43] 0.80% [8],[9],[18],[24],[43] 0.80% [8],[9],[18],[24],[43] 0.80% [8],[9],[18],[24],[43] 0.80% [11],[12],[13],[22],[42] 0.80% [11],[12],[13],[22],[42] 0.80% [11],[12],[13],[22],[42] 0.80% [11],[12],[13],[22],[42] 0.80% [11],[12],[13],[22],[42] 0.80% [11],[12],[13],[22],[42]  
Principal Amount $ 86,700,000 [9],[15],[18],[24],[43]             $ 111,100,000 [11],[12],[13],[16],[22],[42]            
Amortized Cost 85,400,000 [9],[18],[24],[43]             109,400,000 [11],[12],[13],[22],[42]            
Fair Value $ 85,700,000 [1],[9],[18],[24],[43]             $ 109,700,000 [2],[11],[12],[13],[22],[42]            
Investment, Identifier [Axis]: Galway Partners Holdings LLC, Insurance 2                            
Rate, basis spread on variable rate 5.25% [8],[20] 5.25% [8],[20] 5.25% [8],[20] 5.25% [8],[20] 5.25% [8],[20] 5.25% [8],[20] 5.25% [8],[20] 5.25% [10],[19] 5.25% [10],[19] 5.25% [10],[19] 5.25% [10],[19] 5.25% [10],[19] 5.25% [10],[19]  
Rate, PIK 0.00% [8],[20] 0.00% [8],[20] 0.00% [8],[20] 0.00% [8],[20] 0.00% [8],[20] 0.00% [8],[20] 0.00% [8],[20] 0.00% [10],[19] 0.00% [10],[19] 0.00% [10],[19] 0.00% [10],[19] 0.00% [10],[19] 0.00% [10],[19]  
Rate, Max PIK 1.30% [8],[20] 1.30% [8],[20] 1.30% [8],[20] 1.30% [8],[20] 1.30% [8],[20] 1.30% [8],[20] 1.30% [8],[20] 1.30% [10],[19] 1.30% [10],[19] 1.30% [10],[19] 1.30% [10],[19] 1.30% [10],[19] 1.30% [10],[19]  
Floor 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19]  
Principal Amount $ 12,000,000.0 [15],[20]             $ 12,000,000.0 [16],[19]            
Amortized Cost 11,800,000 [20]             11,800,000 [19]            
Fair Value $ 11,800,000 [1],[20]             $ 11,800,000 [2],[19]            
Investment, Identifier [Axis]: Galway Partners Holdings LLC, Insurance 3                            
Rate, basis spread on variable rate [10],[19]               5.25% 5.25% 5.25% 5.25% 5.25% 5.25%  
Rate, PIK [10],[19]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%  
Rate, Max PIK [10],[19]               1.30% 1.30% 1.30% 1.30% 1.30% 1.30%  
Floor [19]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%  
Principal Amount [16],[19]               $ 1,300,000            
Amortized Cost [19]               1,300,000            
Fair Value [2],[19]               $ 1,300,000            
Investment, Identifier [Axis]: General Datatech LP, Software & Services                            
Rate, basis spread on variable rate 6.25% [8],[9],[18],[23],[24],[43] 6.25% [8],[9],[18],[23],[24],[43] 6.25% [8],[9],[18],[23],[24],[43] 6.25% [8],[9],[18],[23],[24],[43] 6.25% [8],[9],[18],[23],[24],[43] 6.25% [8],[9],[18],[23],[24],[43] 6.25% [8],[9],[18],[23],[24],[43] 6.25% [10],[11],[12],[13],[21],[22],[42] 6.25% [10],[11],[12],[13],[21],[22],[42] 6.25% [10],[11],[12],[13],[21],[22],[42] 6.25% [10],[11],[12],[13],[21],[22],[42] 6.25% [10],[11],[12],[13],[21],[22],[42] 6.25% [10],[11],[12],[13],[21],[22],[42]  
Floor 1.00% [8],[9],[18],[23],[24],[43] 1.00% [8],[9],[18],[23],[24],[43] 1.00% [8],[9],[18],[23],[24],[43] 1.00% [8],[9],[18],[23],[24],[43] 1.00% [8],[9],[18],[23],[24],[43] 1.00% [8],[9],[18],[23],[24],[43] 1.00% [8],[9],[18],[23],[24],[43] 1.00% [11],[12],[13],[21],[22],[42] 1.00% [11],[12],[13],[21],[22],[42] 1.00% [11],[12],[13],[21],[22],[42] 1.00% [11],[12],[13],[21],[22],[42] 1.00% [11],[12],[13],[21],[22],[42] 1.00% [11],[12],[13],[21],[22],[42]  
Principal Amount $ 133,400,000 [9],[15],[18],[23],[24],[43]             $ 156,400,000 [11],[12],[13],[16],[21],[22],[42]            
Amortized Cost 132,400,000 [9],[18],[23],[24],[43]             155,100,000 [11],[12],[13],[21],[22],[42]            
Fair Value $ 129,400,000 [1],[9],[18],[23],[24],[43]             $ 146,500,000 [2],[11],[12],[13],[21],[22],[42]            
Investment, Identifier [Axis]: Genesys Telecommunications Laboratories Inc, Class A Shares, Technology Hardware & Equipment                            
Principal (in shares) | shares [13],[28]               40,529 40,529 40,529 40,529 40,529 40,529  
Amortized Cost [13],[28]               $ 0            
Fair Value [2],[13],[28]               $ 0            
Investment, Identifier [Axis]: Genesys Telecommunications Laboratories Inc, Ordinary Shares, Technology Hardware & Equipment                            
Principal (in shares) | shares [9],[33]               41,339 41,339 41,339 41,339 41,339 41,339  
Amortized Cost [9],[33]               $ 0            
Fair Value [2],[9],[33]               $ 0            
Investment, Identifier [Axis]: Genesys Telecommunications Laboratories Inc, Preferred Stock, Technology Hardware & Equipment                            
Principal (in shares) | shares [9],[33]               1,050,465 1,050,465 1,050,465 1,050,465 1,050,465 1,050,465  
Amortized Cost [9],[33]               $ 0            
Fair Value [2],[9],[33]               $ 0            
Investment, Identifier [Axis]: Gigamon Inc, Software & Services                            
Rate, basis spread on variable rate [8],[9] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%              
Floor [8],[9] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%              
Principal Amount [9],[15] $ 106,400,000                          
Amortized Cost [9] 105,600,000                          
Fair Value [1],[9] $ 106,000,000.0                          
Investment, Identifier [Axis]: Gigamon Inc, Software & Services 1                            
Rate, basis spread on variable rate [10],[13]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%  
Floor [13]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%  
Principal Amount [13],[16]               $ 170,400,000            
Amortized Cost [13]               168,900,000            
Fair Value [2],[13]               $ 163,200,000            
Investment, Identifier [Axis]: Gigamon Inc, Software & Services 2                            
Rate, basis spread on variable rate 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19]  
Floor 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19]  
Principal Amount $ 9,300,000 [15],[20]             $ 9,300,000 [16],[19]            
Amortized Cost 9,300,000 [20]             9,300,000 [19]            
Fair Value $ 9,300,000 [1],[20]             $ 8,900,000 [2],[19]            
Investment, Identifier [Axis]: Global Jet Capital LLC, Preferred Stock, Commercial & Professional Services 1                            
Principal (in shares) | shares 149,494,590 [9],[15],[33],[53],[55] 149,494,590 [9],[15],[33],[53],[55] 149,494,590 [9],[15],[33],[53],[55] 149,494,590 [9],[15],[33],[53],[55] 149,494,590 [9],[15],[33],[53],[55] 149,494,590 [9],[15],[33],[53],[55] 149,494,590 [9],[15],[33],[53],[55] 149,494,590 [13],[16],[28],[54],[58] 149,494,590 [13],[16],[28],[54],[58] 149,494,590 [13],[16],[28],[54],[58] 149,494,590 [13],[16],[28],[54],[58] 149,494,590 [13],[16],[28],[54],[58] 149,494,590 [13],[16],[28],[54],[58]  
Amortized Cost $ 69,400,000 [9],[33],[53],[55]             $ 69,400,000 [13],[28],[54],[58]            
Fair Value $ 0 [1],[9],[33],[53],[55]             $ 0 [2],[13],[28],[54],[58]            
Investment, Identifier [Axis]: Global Jet Capital LLC, Preferred Stock, Commercial & Professional Services 2                            
Rate, PIK 9.00% [8],[9],[30],[33],[53],[55] 9.00% [8],[9],[30],[33],[53],[55] 9.00% [8],[9],[30],[33],[53],[55] 9.00% [8],[9],[30],[33],[53],[55] 9.00% [8],[9],[30],[33],[53],[55] 9.00% [8],[9],[30],[33],[53],[55] 9.00% [8],[9],[30],[33],[53],[55] 9.00% [10],[13],[25],[28],[54],[58] 9.00% [10],[13],[25],[28],[54],[58] 9.00% [10],[13],[25],[28],[54],[58] 9.00% [10],[13],[25],[28],[54],[58] 9.00% [10],[13],[25],[28],[54],[58] 9.00% [10],[13],[25],[28],[54],[58]  
Rate, Max PIK 9.00% [8],[9],[30],[33],[53],[55] 9.00% [8],[9],[30],[33],[53],[55] 9.00% [8],[9],[30],[33],[53],[55] 9.00% [8],[9],[30],[33],[53],[55] 9.00% [8],[9],[30],[33],[53],[55] 9.00% [8],[9],[30],[33],[53],[55] 9.00% [8],[9],[30],[33],[53],[55] 9.00% [10],[13],[25],[28],[54],[58] 9.00% [10],[13],[25],[28],[54],[58] 9.00% [10],[13],[25],[28],[54],[58] 9.00% [10],[13],[25],[28],[54],[58] 9.00% [10],[13],[25],[28],[54],[58] 9.00% [10],[13],[25],[28],[54],[58]  
Principal Amount $ 483,600,000 [9],[15],[30],[33],[53],[55]             $ 453,100,000 [13],[16],[25],[28],[54],[58]            
Amortized Cost 309,400,000 [9],[30],[33],[53],[55]             309,400,000 [13],[25],[28],[54],[58]            
Fair Value $ 235,100,000 [1],[9],[30],[33],[53],[55]             $ 232,200,000 [2],[13],[25],[28],[54],[58]            
Investment, Identifier [Axis]: Global Jet Capital LLC, Structured Mezzanine, Commercial & Professional Services 1                            
Rate, PIK 15.00% [8],[9],[34],[53],[55] 15.00% [8],[9],[34],[53],[55] 15.00% [8],[9],[34],[53],[55] 15.00% [8],[9],[34],[53],[55] 15.00% [8],[9],[34],[53],[55] 15.00% [8],[9],[34],[53],[55] 15.00% [8],[9],[34],[53],[55] 15.00% [10],[13],[29],[54],[58] 15.00% [10],[13],[29],[54],[58] 15.00% [10],[13],[29],[54],[58] 15.00% [10],[13],[29],[54],[58] 15.00% [10],[13],[29],[54],[58] 15.00% [10],[13],[29],[54],[58]  
Rate, Max PIK 15.00% [8],[9],[34],[53],[55] 15.00% [8],[9],[34],[53],[55] 15.00% [8],[9],[34],[53],[55] 15.00% [8],[9],[34],[53],[55] 15.00% [8],[9],[34],[53],[55] 15.00% [8],[9],[34],[53],[55] 15.00% [8],[9],[34],[53],[55] 15.00% [10],[13],[29],[54],[58] 15.00% [10],[13],[29],[54],[58] 15.00% [10],[13],[29],[54],[58] 15.00% [10],[13],[29],[54],[58] 15.00% [10],[13],[29],[54],[58] 15.00% [10],[13],[29],[54],[58]  
Principal Amount $ 18,000,000.0 [9],[15],[34],[53],[55]             $ 28,000,000.0 [13],[16],[29],[54],[58]            
Amortized Cost 14,900,000 [9],[34],[53],[55]             21,200,000 [13],[29],[54],[58]            
Fair Value $ 18,000,000.0 [1],[9],[34],[53],[55]             $ 28,000,000.0 [2],[13],[29],[54],[58]            
Investment, Identifier [Axis]: Global Jet Capital LLC, Structured Mezzanine, Commercial & Professional Services 2                            
Rate, PIK 15.00% [8],[9],[34],[53],[55] 15.00% [8],[9],[34],[53],[55] 15.00% [8],[9],[34],[53],[55] 15.00% [8],[9],[34],[53],[55] 15.00% [8],[9],[34],[53],[55] 15.00% [8],[9],[34],[53],[55] 15.00% [8],[9],[34],[53],[55] 15.00% [10],[13],[29],[54],[58] 15.00% [10],[13],[29],[54],[58] 15.00% [10],[13],[29],[54],[58] 15.00% [10],[13],[29],[54],[58] 15.00% [10],[13],[29],[54],[58] 15.00% [10],[13],[29],[54],[58]  
Rate, Max PIK 15.00% [8],[9],[34],[53],[55] 15.00% [8],[9],[34],[53],[55] 15.00% [8],[9],[34],[53],[55] 15.00% [8],[9],[34],[53],[55] 15.00% [8],[9],[34],[53],[55] 15.00% [8],[9],[34],[53],[55] 15.00% [8],[9],[34],[53],[55] 15.00% [10],[13],[29],[54],[58] 15.00% [10],[13],[29],[54],[58] 15.00% [10],[13],[29],[54],[58] 15.00% [10],[13],[29],[54],[58] 15.00% [10],[13],[29],[54],[58] 15.00% [10],[13],[29],[54],[58]  
Principal Amount $ 13,200,000 [9],[15],[34],[53],[55]             $ 20,500,000 [13],[16],[29],[54],[58]            
Amortized Cost 10,700,000 [9],[34],[53],[55]             15,100,000 [13],[29],[54],[58]            
Fair Value $ 13,200,000 [1],[9],[34],[53],[55]             $ 20,500,000 [2],[13],[29],[54],[58]            
Investment, Identifier [Axis]: Global Jet Capital LLC, Structured Mezzanine, Commercial & Professional Services 3                            
Rate, PIK 15.00% [8],[9],[34],[53],[55] 15.00% [8],[9],[34],[53],[55] 15.00% [8],[9],[34],[53],[55] 15.00% [8],[9],[34],[53],[55] 15.00% [8],[9],[34],[53],[55] 15.00% [8],[9],[34],[53],[55] 15.00% [8],[9],[34],[53],[55] 15.00% [10],[13],[29],[54],[58] 15.00% [10],[13],[29],[54],[58] 15.00% [10],[13],[29],[54],[58] 15.00% [10],[13],[29],[54],[58] 15.00% [10],[13],[29],[54],[58] 15.00% [10],[13],[29],[54],[58]  
Rate, Max PIK 15.00% [8],[9],[34],[53],[55] 15.00% [8],[9],[34],[53],[55] 15.00% [8],[9],[34],[53],[55] 15.00% [8],[9],[34],[53],[55] 15.00% [8],[9],[34],[53],[55] 15.00% [8],[9],[34],[53],[55] 15.00% [8],[9],[34],[53],[55] 15.00% [10],[13],[29],[54],[58] 15.00% [10],[13],[29],[54],[58] 15.00% [10],[13],[29],[54],[58] 15.00% [10],[13],[29],[54],[58] 15.00% [10],[13],[29],[54],[58] 15.00% [10],[13],[29],[54],[58]  
Principal Amount $ 1,500,000 [9],[15],[34],[53],[55]             $ 2,400,000 [13],[16],[29],[54],[58]            
Amortized Cost 1,200,000 [9],[34],[53],[55]             1,700,000 [13],[29],[54],[58]            
Fair Value $ 1,500,000 [1],[9],[34],[53],[55]             $ 2,400,000 [2],[13],[29],[54],[58]            
Investment, Identifier [Axis]: Global Lending Services LLC, Private Equity, Diversified Financials 1                            
Principal (in shares) | shares [13],[16],[29]               7,391,109 7,391,109 7,391,109 7,391,109 7,391,109 7,391,109  
Amortized Cost [13],[29]               $ 8,600,000            
Fair Value [2],[13],[29]               $ 8,200,000            
Investment, Identifier [Axis]: Global Lending Services LLC, Private Equity, Diversified Financials 2                            
Principal (in shares) | shares [13],[16],[29]               10,356,657 10,356,657 10,356,657 10,356,657 10,356,657 10,356,657  
Amortized Cost [13],[29]               $ 10,400,000            
Fair Value [2],[13],[29]               $ 10,900,000            
Investment, Identifier [Axis]: Global Lending Services LLC, Private Equity, Diversified Financials 3                            
Principal (in shares) | shares [13],[16],[28],[29]               9,963,808 9,963,808 9,963,808 9,963,808 9,963,808 9,963,808  
Amortized Cost [13],[28],[29]               $ 10,000,000.0            
Fair Value [2],[13],[28],[29]               10,000,000.0            
Investment, Identifier [Axis]: Global Lending Services LLC, Private Equity, Financial Services 1                            
Principal (in shares) | shares [9],[15],[34] 4,295,211 4,295,211 4,295,211 4,295,211 4,295,211 4,295,211 4,295,211              
Amortized Cost [9],[34] $ 5,000,000.0                          
Fair Value [1],[9],[34] $ 5,100,000                          
Investment, Identifier [Axis]: Global Lending Services LLC, Private Equity, Financial Services 2                            
Principal (in shares) | shares [9],[15],[34] 7,326,568 7,326,568 7,326,568 7,326,568 7,326,568 7,326,568 7,326,568              
Amortized Cost [9],[34] $ 7,300,000                          
Fair Value [1],[9],[34] $ 7,300,000                          
Investment, Identifier [Axis]: Global Lending Services LLC, Private Equity, Financial Services 3                            
Principal (in shares) | shares [9],[15],[34] 26,891,751 26,891,751 26,891,751 26,891,751 26,891,751 26,891,751 26,891,751              
Amortized Cost [9],[34] $ 26,900,000                          
Fair Value [1],[9],[34] 27,100,000                          
Investment, Identifier [Axis]: Gracent LLC                            
Fair Value 23,600,000             0            
Investment, Identifier [Axis]: Gracent LLC, Class A Common Stock                            
Fair Value $ 0             $ 0            
Investment, Identifier [Axis]: Gracent LLC, Class A Common Stock, Health Care Equipment & Services                            
Principal (in shares) | shares [33],[35],[51] 250 250 250 250 250 250 250              
Amortized Cost [33],[35],[51] $ 0                          
Fair Value [1],[33],[35],[51] $ 0                          
Investment, Identifier [Axis]: Gracent LLC, Health Care Equipment & Services 1                            
Rate, basis spread on variable rate 12.00% [8],[9],[35] 12.00% [8],[9],[35] 12.00% [8],[9],[35] 12.00% [8],[9],[35] 12.00% [8],[9],[35] 12.00% [8],[9],[35] 12.00% [8],[9],[35] 5.50% [10],[13] 5.50% [10],[13] 5.50% [10],[13] 5.50% [10],[13] 5.50% [10],[13] 5.50% [10],[13]  
Rate, PIK [8],[9],[35] 12.00% 12.00% 12.00% 12.00% 12.00% 12.00% 12.00%              
Floor 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13]  
Principal Amount $ 27,400,000 [9],[15],[35]             $ 25,900,000 [13],[16]            
Amortized Cost 23,800,000 [9],[35]             26,600,000 [13]            
Fair Value 23,600,000 [1],[9],[35]             $ 22,100,000 [2],[13]            
Investment, Identifier [Axis]: Gracent LLC, Health Care Equipment & Services 2                            
Rate, PIK [10],[13],[25],[28]               12.00% 12.00% 12.00% 12.00% 12.00% 12.00%  
Rate, Max PIK [10],[13],[25],[28]               12.00% 12.00% 12.00% 12.00% 12.00% 12.00%  
Principal Amount [13],[16],[25],[28]               $ 22,900,000            
Amortized Cost [13],[25],[28]               22,600,000            
Fair Value [2],[13],[25],[28]               $ 11,400,000            
Investment, Identifier [Axis]: Gracent LLC, NP-1 Common Stock, Health Care Equipment & Services                            
Principal (in shares) | shares [28],[52]               1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000  
Amortized Cost [28],[52]               $ 4,200,000            
Fair Value [2],[28],[52]               0            
Investment, Identifier [Axis]: Gracent LLC, Preferred Equity                            
Fair Value $ 6,600,000             0            
Investment, Identifier [Axis]: Gracent LLC, Preferred Equity, Health Care Equipment & Services                            
Principal (in shares) | shares [33],[35],[51] 1,000 1,000 1,000 1,000 1,000 1,000 1,000              
Amortized Cost [33],[35],[51] $ 8,200,000                          
Fair Value [1],[33],[35],[51] 6,600,000                          
Investment, Identifier [Axis]: Gracent LLC, Preferred Stock A                            
Fair Value $ 0             0            
Investment, Identifier [Axis]: Gracent LLC, Preferred Stock A, Health Care Equipment & Services                            
Principal (in shares) | shares [33],[35],[51] 500 500 500 500 500 500 500              
Amortized Cost [33],[35],[51] $ 8,000,000.0                          
Fair Value [1],[33],[35],[51] 0                          
Investment, Identifier [Axis]: Gracent LLC, Preferred Stock B                            
Fair Value $ 0             $ 0            
Investment, Identifier [Axis]: Gracent LLC, Preferred Stock B, Health Care Equipment & Services                            
Principal (in shares) | shares [33],[35],[51] 745 745 745 745 745 745 745              
Amortized Cost [33],[35],[51] $ 0                          
Fair Value [1],[33],[35],[51] $ 0                          
Investment, Identifier [Axis]: Greystone Equity Member Corp, Diversified Financials                            
Rate, basis spread on variable rate [10],[13],[29]               7.25% 7.25% 7.25% 7.25% 7.25% 7.25%  
Floor [13],[29]               3.80% 3.80% 3.80% 3.80% 3.80% 3.80%  
Principal Amount [13],[16],[29]               $ 194,800,000            
Amortized Cost [13],[29]               185,000,000.0            
Fair Value [2],[13],[29]               $ 188,700,000            
Investment, Identifier [Axis]: Greystone Equity Member Corp, Financial Services                            
Rate, basis spread on variable rate [8],[9],[34] 7.25% 7.25% 7.25% 7.25% 7.25% 7.25% 7.25%              
Floor [8],[9],[34] 3.80% 3.80% 3.80% 3.80% 3.80% 3.80% 3.80%              
Principal Amount [9],[15],[34] $ 194,800,000                          
Amortized Cost [9],[34] 186,800,000                          
Fair Value [1],[9],[34] $ 192,800,000                          
Investment, Identifier [Axis]: HKA, Commercial & Professional Services 1                            
Rate, basis spread on variable rate 5.75% [8],[9],[34],[43] 5.75% [8],[9],[34],[43] 5.75% [8],[9],[34],[43] 5.75% [8],[9],[34],[43] 5.75% [8],[9],[34],[43] 5.75% [8],[9],[34],[43] 5.75% [8],[9],[34],[43] 5.75% [10],[13],[29] 5.75% [10],[13],[29] 5.75% [10],[13],[29] 5.75% [10],[13],[29] 5.75% [10],[13],[29] 5.75% [10],[13],[29]  
Rate, PIK 0.00% [8],[9],[34],[43] 0.00% [8],[9],[34],[43] 0.00% [8],[9],[34],[43] 0.00% [8],[9],[34],[43] 0.00% [8],[9],[34],[43] 0.00% [8],[9],[34],[43] 0.00% [8],[9],[34],[43] 0.00% [10],[13],[29] 0.00% [10],[13],[29] 0.00% [10],[13],[29] 0.00% [10],[13],[29] 0.00% [10],[13],[29] 0.00% [10],[13],[29]  
Rate, Max PIK 1.80% [8],[9],[34],[43] 1.80% [8],[9],[34],[43] 1.80% [8],[9],[34],[43] 1.80% [8],[9],[34],[43] 1.80% [8],[9],[34],[43] 1.80% [8],[9],[34],[43] 1.80% [8],[9],[34],[43] 1.80% [10],[13],[29] 1.80% [10],[13],[29] 1.80% [10],[13],[29] 1.80% [10],[13],[29] 1.80% [10],[13],[29] 1.80% [10],[13],[29]  
Floor 0.50% [8],[9],[34],[43] 0.50% [8],[9],[34],[43] 0.50% [8],[9],[34],[43] 0.50% [8],[9],[34],[43] 0.50% [8],[9],[34],[43] 0.50% [8],[9],[34],[43] 0.50% [8],[9],[34],[43] 0.50% [13],[29] 0.50% [13],[29] 0.50% [13],[29] 0.50% [13],[29] 0.50% [13],[29] 0.50% [13],[29]  
Principal Amount $ 4,600,000 [9],[15],[34],[43]             $ 4,400,000 [13],[16],[29]            
Amortized Cost 4,500,000 [9],[34],[43]             4,300,000 [13],[29]            
Fair Value 4,400,000 [1],[9],[34],[43]             $ 4,200,000 [2],[13],[29]            
Investment, Identifier [Axis]: HKA, Commercial & Professional Services 2                            
Rate, basis spread on variable rate [10],[19],[29]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%  
Rate, PIK [10],[19],[29]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%  
Rate, Max PIK [10]               1.80% 1.80% 1.80% 1.80% 1.80% 1.80%  
Floor [19],[29]               0.50% 0.50% 0.50% 0.50% 0.50% 0.50%  
Principal Amount [16],[19],[29]               $ 200,000            
Amortized Cost [19],[29]               200,000            
Fair Value [2],[19],[29]               200,000            
Investment, Identifier [Axis]: HM Dunn Co Inc 1                            
Fair Value 36,300,000             35,600,000           33,600,000
Investment, Identifier [Axis]: HM Dunn Co Inc 2                            
Fair Value $ 1,000,000.0             $ 0           2,000,000.0
Investment, Identifier [Axis]: HM Dunn Co Inc, Capital Goods 1                            
Rate, basis spread on variable rate 6.00% [8],[9],[35] 6.00% [8],[9],[35] 6.00% [8],[9],[35] 6.00% [8],[9],[35] 6.00% [8],[9],[35] 6.00% [8],[9],[35] 6.00% [8],[9],[35] 6.00% [10],[13],[36] 6.00% [10],[13],[36] 6.00% [10],[13],[36] 6.00% [10],[13],[36] 6.00% [10],[13],[36] 6.00% [10],[13],[36]  
Rate, PIK 6.00% [8],[9],[35] 6.00% [8],[9],[35] 6.00% [8],[9],[35] 6.00% [8],[9],[35] 6.00% [8],[9],[35] 6.00% [8],[9],[35] 6.00% [8],[9],[35] 0.00% [10],[13],[36] 0.00% [10],[13],[36] 0.00% [10],[13],[36] 0.00% [10],[13],[36] 0.00% [10],[13],[36] 0.00% [10],[13],[36]  
Rate, Max PIK [10],[13],[36]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Floor 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [13],[36] 1.00% [13],[36] 1.00% [13],[36] 1.00% [13],[36] 1.00% [13],[36] 1.00% [13],[36]  
Principal Amount $ 36,300,000 [9],[15],[35]             $ 35,600,000 [13],[16],[36]            
Amortized Cost 36,300,000 [9],[35]             35,600,000 [13],[36]            
Fair Value $ 36,300,000 [1],[9],[35]             $ 35,600,000 [2],[13],[36]            
Investment, Identifier [Axis]: HM Dunn Co Inc, Capital Goods 2                            
Rate, basis spread on variable rate 6.00% [8],[9],[35] 6.00% [8],[9],[35] 6.00% [8],[9],[35] 6.00% [8],[9],[35] 6.00% [8],[9],[35] 6.00% [8],[9],[35] 6.00% [8],[9],[35] 6.00% [10],[19],[36] 6.00% [10],[19],[36] 6.00% [10],[19],[36] 6.00% [10],[19],[36] 6.00% [10],[19],[36] 6.00% [10],[19],[36]  
Rate, PIK 6.00% [8],[9],[35] 6.00% [8],[9],[35] 6.00% [8],[9],[35] 6.00% [8],[9],[35] 6.00% [8],[9],[35] 6.00% [8],[9],[35] 6.00% [8],[9],[35] 0.00% [10],[19],[36] 0.00% [10],[19],[36] 0.00% [10],[19],[36] 0.00% [10],[19],[36] 0.00% [10],[19],[36] 0.00% [10],[19],[36]  
Rate, Max PIK [10],[19],[36]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Floor 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [19],[36] 1.00% [19],[36] 1.00% [19],[36] 1.00% [19],[36] 1.00% [19],[36] 1.00% [19],[36]  
Principal Amount $ 1,000,000.0 [9],[15],[35]             $ 2,000,000.0 [16],[19],[36]            
Amortized Cost 1,000,000.0 [9],[35]             2,000,000.0 [19],[36]            
Fair Value $ 1,000,000.0 [1],[9],[35]             2,000,000.0 [2],[19],[36]            
Investment, Identifier [Axis]: HM Dunn Co Inc, Capital Goods 3                            
Rate, basis spread on variable rate [8],[20],[35] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%              
Rate, PIK [8],[20],[35] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%              
Floor [8],[20],[35] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [15],[20],[35] $ 1,000,000.0                          
Amortized Cost [20],[35] 1,000,000.0                          
Fair Value [1],[20],[35] 1,000,000.0                          
Investment, Identifier [Axis]: HM Dunn Co Inc, Preferred Stock, Series A                            
Fair Value $ 24,300,000             $ 16,900,000           7,100,000
Investment, Identifier [Axis]: HM Dunn Co Inc, Preferred Stock, Series A, Capital Goods                            
Principal (in shares) | shares 85,385 [9],[33],[35],[37] 85,385 [9],[33],[35],[37] 85,385 [9],[33],[35],[37] 85,385 [9],[33],[35],[37] 85,385 [9],[33],[35],[37] 85,385 [9],[33],[35],[37] 85,385 [9],[33],[35],[37] 85,385 [13],[28],[36],[38] 85,385 [13],[28],[36],[38] 85,385 [13],[28],[36],[38] 85,385 [13],[28],[36],[38] 85,385 [13],[28],[36],[38] 85,385 [13],[28],[36],[38]  
Amortized Cost $ 7,100,000 [9],[33],[35],[37]             $ 7,100,000 [13],[28],[36],[38]            
Fair Value 24,300,000 [1],[9],[33],[35],[37]             16,900,000 [2],[13],[28],[36],[38]            
Investment, Identifier [Axis]: HM Dunn Co Inc, Preferred Stock, Series B                            
Fair Value $ 0             $ 0           0
Investment, Identifier [Axis]: HM Dunn Co Inc, Preferred Stock, Series B, Capital Goods                            
Principal (in shares) | shares 15,000 [9],[33],[35],[37] 15,000 [9],[33],[35],[37] 15,000 [9],[33],[35],[37] 15,000 [9],[33],[35],[37] 15,000 [9],[33],[35],[37] 15,000 [9],[33],[35],[37] 15,000 [9],[33],[35],[37] 15,000 [13],[28],[36],[38] 15,000 [13],[28],[36],[38] 15,000 [13],[28],[36],[38] 15,000 [13],[28],[36],[38] 15,000 [13],[28],[36],[38] 15,000 [13],[28],[36],[38]  
Amortized Cost $ 0 [9],[33],[35],[37]             $ 0 [13],[28],[36],[38]            
Fair Value $ 0 [1],[9],[33],[35],[37]             $ 0 [2],[13],[28],[36],[38]            
Investment, Identifier [Axis]: Harvey Industries Inc, Common Stock, Capital Goods                            
Principal (in shares) | shares [9],[33] 5,000,000 5,000,000 5,000,000 5,000,000 5,000,000 5,000,000 5,000,000 5,000,000 5,000,000 5,000,000 5,000,000 5,000,000 5,000,000  
Amortized Cost [9],[33] $ 2,200,000             $ 2,200,000            
Fair Value [9],[33] $ 5,900,000 [1]             $ 5,200,000 [2]            
Investment, Identifier [Axis]: Heniff Transportation Systems LLC, Transportation 1                            
Rate, basis spread on variable rate 5.75% [8],[9] 5.75% [8],[9] 5.75% [8],[9] 5.75% [8],[9] 5.75% [8],[9] 5.75% [8],[9] 5.75% [8],[9] 5.75% [10],[11],[12],[13],[14],[21],[42] 5.75% [10],[11],[12],[13],[14],[21],[42] 5.75% [10],[11],[12],[13],[14],[21],[42] 5.75% [10],[11],[12],[13],[14],[21],[42] 5.75% [10],[11],[12],[13],[14],[21],[42] 5.75% [10],[11],[12],[13],[14],[21],[42]  
Floor 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [11],[12],[13],[14],[21],[42] 1.00% [11],[12],[13],[14],[21],[42] 1.00% [11],[12],[13],[14],[21],[42] 1.00% [11],[12],[13],[14],[21],[42] 1.00% [11],[12],[13],[14],[21],[42] 1.00% [11],[12],[13],[14],[21],[42]  
Principal Amount $ 8,600,000 [9],[15]             $ 135,700,000 [11],[12],[13],[14],[16],[21],[42]            
Amortized Cost 8,500,000 [9]             129,800,000 [11],[12],[13],[14],[21],[42]            
Fair Value $ 8,600,000 [1],[9]             $ 131,300,000 [2],[11],[12],[13],[14],[21],[42]            
Investment, Identifier [Axis]: Heniff Transportation Systems LLC, Transportation 2                            
Rate, basis spread on variable rate 5.75% [8],[18],[23],[43] 5.75% [8],[18],[23],[43] 5.75% [8],[18],[23],[43] 5.75% [8],[18],[23],[43] 5.75% [8],[18],[23],[43] 5.75% [8],[18],[23],[43] 5.75% [8],[18],[23],[43] 6.25% [10],[13] 6.25% [10],[13] 6.25% [10],[13] 6.25% [10],[13] 6.25% [10],[13] 6.25% [10],[13]  
Floor 1.00% [8],[18],[23],[43] 1.00% [8],[18],[23],[43] 1.00% [8],[18],[23],[43] 1.00% [8],[18],[23],[43] 1.00% [8],[18],[23],[43] 1.00% [8],[18],[23],[43] 1.00% [8],[18],[23],[43] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13]  
Principal Amount $ 81,300,000 [15],[18],[23],[43]             $ 19,100,000 [13],[16]            
Amortized Cost 76,500,000 [18],[23],[43]             18,400,000 [13]            
Fair Value $ 80,900,000 [1],[18],[23],[43]             $ 18,500,000 [2],[13]            
Investment, Identifier [Axis]: Heniff Transportation Systems LLC, Transportation 3                            
Rate, basis spread on variable rate 6.25% [8],[9] 6.25% [8],[9] 6.25% [8],[9] 6.25% [8],[9] 6.25% [8],[9] 6.25% [8],[9] 6.25% [8],[9] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19]  
Floor 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19]  
Principal Amount $ 13,300,000 [9],[15]             $ 17,800,000 [16],[19]            
Amortized Cost 12,700,000 [9]             17,600,000 [19]            
Fair Value $ 13,200,000 [1],[9]             $ 17,200,000 [2],[19]            
Investment, Identifier [Axis]: Heniff Transportation Systems LLC, Transportation 4                            
Rate, basis spread on variable rate [8],[20] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%              
Floor [8],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [15],[20] $ 9,200,000                          
Amortized Cost [20] 9,200,000                          
Fair Value [1],[20] $ 9,200,000                          
Investment, Identifier [Axis]: Hibu Inc, Commercial & Professional Services                            
Rate, basis spread on variable rate 6.25% [8],[9],[18],[23],[24],[43] 6.25% [8],[9],[18],[23],[24],[43] 6.25% [8],[9],[18],[23],[24],[43] 6.25% [8],[9],[18],[23],[24],[43] 6.25% [8],[9],[18],[23],[24],[43] 6.25% [8],[9],[18],[23],[24],[43] 6.25% [8],[9],[18],[23],[24],[43] 6.25% [10],[11],[12],[13],[21],[22],[42] 6.25% [10],[11],[12],[13],[21],[22],[42] 6.25% [10],[11],[12],[13],[21],[22],[42] 6.25% [10],[11],[12],[13],[21],[22],[42] 6.25% [10],[11],[12],[13],[21],[22],[42] 6.25% [10],[11],[12],[13],[21],[22],[42]  
Floor 1.00% [8],[9],[18],[23],[24],[43] 1.00% [8],[9],[18],[23],[24],[43] 1.00% [8],[9],[18],[23],[24],[43] 1.00% [8],[9],[18],[23],[24],[43] 1.00% [8],[9],[18],[23],[24],[43] 1.00% [8],[9],[18],[23],[24],[43] 1.00% [8],[9],[18],[23],[24],[43] 1.00% [11],[12],[13],[21],[22],[42] 1.00% [11],[12],[13],[21],[22],[42] 1.00% [11],[12],[13],[21],[22],[42] 1.00% [11],[12],[13],[21],[22],[42] 1.00% [11],[12],[13],[21],[22],[42] 1.00% [11],[12],[13],[21],[22],[42]  
Principal Amount $ 95,800,000 [9],[15],[18],[23],[24],[43]             $ 99,000,000.0 [11],[12],[13],[16],[21],[22],[42]            
Amortized Cost 92,200,000 [9],[18],[23],[24],[43]             94,800,000 [11],[12],[13],[21],[22],[42]            
Fair Value $ 96,700,000 [1],[9],[18],[23],[24],[43]             $ 99,800,000 [2],[11],[12],[13],[21],[22],[42]            
Investment, Identifier [Axis]: Higginbotham Insurance Agency Inc, Insurance 1                            
Rate, basis spread on variable rate 5.50% [8],[9] 5.50% [8],[9] 5.50% [8],[9] 5.50% [8],[9] 5.50% [8],[9] 5.50% [8],[9] 5.50% [8],[9] 5.50% [10],[13] 5.50% [10],[13] 5.50% [10],[13] 5.50% [10],[13] 5.50% [10],[13] 5.50% [10],[13]  
Floor 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13]  
Principal Amount $ 10,300,000 [9],[15]             $ 4,400,000 [13],[16]            
Amortized Cost 10,200,000 [9]             4,400,000 [13]            
Fair Value $ 10,200,000 [1],[9]             $ 4,400,000 [2],[13]            
Investment, Identifier [Axis]: Higginbotham Insurance Agency Inc, Insurance 2                            
Rate, basis spread on variable rate 5.25% [8],[9] 5.25% [8],[9] 5.25% [8],[9] 5.25% [8],[9] 5.25% [8],[9] 5.25% [8],[9] 5.25% [8],[9] 5.25% [10],[13] 5.25% [10],[13] 5.25% [10],[13] 5.25% [10],[13] 5.25% [10],[13] 5.25% [10],[13]  
Floor 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13]  
Principal Amount $ 6,900,000 [9],[15]             $ 7,000,000.0 [13],[16]            
Amortized Cost 6,600,000 [9]             6,600,000 [13]            
Fair Value 6,900,000 [1],[9]             $ 7,000,000.0 [2],[13]            
Investment, Identifier [Axis]: Higginbotham Insurance Agency Inc, Insurance 3                            
Rate, basis spread on variable rate [10],[19]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%  
Floor [19]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%  
Principal Amount [16],[19]               $ 6,000,000.0            
Amortized Cost [19]               6,000,000.0            
Fair Value [2],[19]               6,000,000.0            
Investment, Identifier [Axis]: Hilding Anders 1                            
Fair Value 0             0           46,600,000
Investment, Identifier [Axis]: Hilding Anders 2                            
Fair Value 0             0           0
Investment, Identifier [Axis]: Hilding Anders 3                            
Fair Value 0             0           0
Investment, Identifier [Axis]: Hilding Anders, Class A Common Stock                            
Fair Value 0             $ 0           0
Investment, Identifier [Axis]: Hilding Anders, Class A Common Stock, Consumer Durables & Apparel                            
Principal (in shares) | shares [13],[28],[29],[36]               4,503,411 4,503,411 4,503,411 4,503,411 4,503,411 4,503,411  
Amortized Cost [13],[28],[29],[36]               $ 100,000            
Fair Value [2],[13],[28],[29],[36]               0            
Investment, Identifier [Axis]: Hilding Anders, Class B Common Stock                            
Fair Value 0             $ 0           0
Investment, Identifier [Axis]: Hilding Anders, Class B Common Stock, Consumer Durables & Apparel                            
Principal (in shares) | shares [13],[28],[29],[36]               574,791 574,791 574,791 574,791 574,791 574,791  
Amortized Cost [13],[28],[29],[36]               $ 0            
Fair Value [2],[13],[28],[29],[36]               0            
Investment, Identifier [Axis]: Hilding Anders, Class C Common Stock                            
Fair Value 0             $ 0           0
Investment, Identifier [Axis]: Hilding Anders, Class C Common Stock, Consumer Durables & Apparel                            
Principal (in shares) | shares [13],[28],[29],[36]               213,201 213,201 213,201 213,201 213,201 213,201  
Amortized Cost [13],[28],[29],[36]               $ 0            
Fair Value [2],[13],[28],[29],[36]               $ 0            
Investment, Identifier [Axis]: Hilding Anders, Consumer Durables & Apparel 1                            
Principal Amount | € [13],[16],[28],[29],[36]                 € 135.2          
Amortized Cost | € [13],[28],[29],[36]                 26.9          
Fair Value | € [2],[13],[28],[29],[36]                 € 0.0          
Investment, Identifier [Axis]: Hilding Anders, Consumer Durables & Apparel 2                            
Rate, PIK [10],[13],[25],[28],[29],[36]               13.00% 13.00% 13.00% 13.00% 13.00% 13.00%  
Rate, Max PIK [10],[13],[25],[28],[29],[36]               13.00% 13.00% 13.00% 13.00% 13.00% 13.00%  
Principal Amount | € [13],[16],[25],[28],[29],[36]                 € 152.6          
Amortized Cost | € [13],[25],[28],[29],[36]                 99.4          
Fair Value | € [2],[13],[25],[28],[29],[36]                 € 0.0          
Investment, Identifier [Axis]: Hilding Anders, Equity Options                            
Fair Value 0             $ 0           0
Investment, Identifier [Axis]: Hilding Anders, Equity Options, Consumer Durables & Apparel                            
Principal (in shares) | shares [13],[28],[29],[36]               236,160,807 236,160,807 236,160,807 236,160,807 236,160,807 236,160,807  
Amortized Cost [13],[28],[29],[36]               $ 15,000,000.0            
Fair Value [2],[13],[28],[29],[36]               0            
Investment, Identifier [Axis]: Home Partners JV 2, Private Equity 1                            
Fair Value 200,000             200,000            
Investment, Identifier [Axis]: Home Partners JV 2, Private Equity 2                            
Fair Value $ 4,000,000.0             $ 5,000,000.0            
Investment, Identifier [Axis]: Home Partners JV 2, Private Equity, Equity Real Estate Investment Trusts (REITs) 1                            
Principal (in shares) | shares [9],[15],[33],[34],[44] 4,471,509 4,471,509 4,471,509 4,471,509 4,471,509 4,471,509 4,471,509              
Amortized Cost [9],[33],[34],[44] $ 4,400,000                          
Fair Value [1],[9],[33],[34],[44] $ 4,000,000.0                          
Investment, Identifier [Axis]: Home Partners JV 2, Private Equity, Equity Real Estate Investment Trusts (REITs) 2                            
Principal (in shares) | shares [9],[15],[33],[34],[44] 168,710 168,710 168,710 168,710 168,710 168,710 168,710              
Amortized Cost [9],[33],[34],[44] $ 200,000                          
Fair Value [1],[9],[33],[34],[44] 200,000                          
Investment, Identifier [Axis]: Home Partners JV 2, Private Equity, Real Estate 1                            
Principal (in shares) | shares [13],[16],[28],[29],[45]               4,471,509 4,471,509 4,471,509 4,471,509 4,471,509 4,471,509  
Amortized Cost [13],[28],[29],[45]               $ 4,400,000            
Fair Value [2],[13],[28],[29],[45]               $ 5,000,000.0            
Investment, Identifier [Axis]: Home Partners JV 2, Private Equity, Real Estate 2                            
Principal (in shares) | shares [13],[16],[28],[29],[45]               168,710 168,710 168,710 168,710 168,710 168,710  
Amortized Cost [13],[28],[29],[45]               $ 200,000            
Fair Value [2],[13],[28],[29],[45]               200,000            
Investment, Identifier [Axis]: Home Partners JV 2, Structured Mezzanine                            
Fair Value $ 11,100,000             10,200,000            
Investment, Identifier [Axis]: Home Partners JV 2, Structured Mezzanine, Asset Based Finance                            
Fair Value               $ 10,200,000           3,500,000
Investment, Identifier [Axis]: Home Partners JV 2, Structured Mezzanine, Equity Real Estate Investment Trusts (REITs)                            
Rate, PIK [8],[9],[34],[44] 11.00% 11.00% 11.00% 11.00% 11.00% 11.00% 11.00%              
Rate, Max PIK [8],[9],[34],[44] 11.00% 11.00% 11.00% 11.00% 11.00% 11.00% 11.00%              
Principal Amount [9],[15],[34],[44] $ 11,100,000                          
Amortized Cost [9],[34],[44] 11,100,000                          
Fair Value [1],[9],[34],[44] $ 11,100,000                          
Investment, Identifier [Axis]: Home Partners JV 2, Structured Mezzanine, Real Estate                            
Rate, PIK [10],[13],[29],[45]               11.00% 11.00% 11.00% 11.00% 11.00% 11.00%  
Rate, Max PIK [10],[13],[29],[45]               11.00% 11.00% 11.00% 11.00% 11.00% 11.00%  
Principal Amount [13],[16],[29],[45]               $ 10,200,000            
Amortized Cost [13],[29],[45]               10,200,000            
Fair Value [2],[13],[29],[45]               10,200,000            
Investment, Identifier [Axis]: Home Partners JV, Common Stock, Asset Based Finance -2                            
Fair Value               $ 0           80,600,000
Investment, Identifier [Axis]: Imagine Communications Corp, Common Stock, Media & Entertainment                            
Principal (in shares) | shares [9],[33] 33,034 33,034 33,034 33,034 33,034 33,034 33,034 33,034 33,034 33,034 33,034 33,034 33,034  
Amortized Cost [9],[33] $ 3,800,000             $ 3,800,000            
Fair Value [9],[33] $ 2,100,000 [1]             $ 2,000,000.0 [2]            
Investment, Identifier [Axis]: Individual FoodService, Capital Goods 1                            
Rate, basis spread on variable rate 6.25% [8],[9] 6.25% [8],[9] 6.25% [8],[9] 6.25% [8],[9] 6.25% [8],[9] 6.25% [8],[9] 6.25% [8],[9] 6.25% [10],[38],[42] 6.25% [10],[38],[42] 6.25% [10],[38],[42] 6.25% [10],[38],[42] 6.25% [10],[38],[42] 6.25% [10],[38],[42]  
Floor 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [38],[42] 1.00% [38],[42] 1.00% [38],[42] 1.00% [38],[42] 1.00% [38],[42] 1.00% [38],[42]  
Principal Amount $ 500,000 [9],[15]             $ 69,400,000 [16],[38],[42]            
Amortized Cost 500,000 [9]             66,100,000 [38],[42]            
Fair Value $ 500,000 [1],[9]             $ 68,700,000 [2],[38],[42]            
Investment, Identifier [Axis]: Individual FoodService, Capital Goods 2                            
Rate, basis spread on variable rate 6.25% [8],[9],[37] 6.25% [8],[9],[37] 6.25% [8],[9],[37] 6.25% [8],[9],[37] 6.25% [8],[9],[37] 6.25% [8],[9],[37] 6.25% [8],[9],[37] 6.25% [10],[13] 6.25% [10],[13] 6.25% [10],[13] 6.25% [10],[13] 6.25% [10],[13] 6.25% [10],[13]  
Floor 1.00% [8],[9],[37] 1.00% [8],[9],[37] 1.00% [8],[9],[37] 1.00% [8],[9],[37] 1.00% [8],[9],[37] 1.00% [8],[9],[37] 1.00% [8],[9],[37] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13]  
Principal Amount $ 104,400,000 [9],[15],[37]             $ 5,200,000 [13],[16]            
Amortized Cost 101,800,000 [9],[37]             5,200,000 [13]            
Fair Value $ 104,400,000 [1],[9],[37]             $ 5,200,000 [2],[13]            
Investment, Identifier [Axis]: Individual FoodService, Capital Goods 3                            
Rate, basis spread on variable rate 6.25% [8],[20] 6.25% [8],[20] 6.25% [8],[20] 6.25% [8],[20] 6.25% [8],[20] 6.25% [8],[20] 6.25% [8],[20] 6.25% [10],[13],[42] 6.25% [10],[13],[42] 6.25% [10],[13],[42] 6.25% [10],[13],[42] 6.25% [10],[13],[42] 6.25% [10],[13],[42]  
Floor 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [13],[42] 1.00% [13],[42] 1.00% [13],[42] 1.00% [13],[42] 1.00% [13],[42] 1.00% [13],[42]  
Principal Amount $ 4,200,000 [15],[20]             $ 16,700,000 [13],[16],[42]            
Amortized Cost 4,200,000 [20]             16,700,000 [13],[42]            
Fair Value $ 4,200,000 [1],[20]             $ 16,600,000 [2],[13],[42]            
Investment, Identifier [Axis]: Individual FoodService, Capital Goods 4                            
Rate, basis spread on variable rate [10],[13]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%  
Floor [13]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [13],[16]               $ 5,400,000            
Amortized Cost [13]               5,400,000            
Fair Value [2],[13]               $ 5,400,000            
Investment, Identifier [Axis]: Individual FoodService, Capital Goods 5                            
Rate, basis spread on variable rate [10],[13]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%  
Floor [13]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [13],[16]               $ 6,900,000            
Amortized Cost [13]               6,900,000            
Fair Value [2],[13]               $ 6,800,000            
Investment, Identifier [Axis]: Individual FoodService, Capital Goods 6                            
Rate, basis spread on variable rate [10],[19]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%  
Floor [19]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [16],[19]               $ 4,800,000            
Amortized Cost [19]               4,700,000            
Fair Value [2],[19]               $ 4,700,000            
Investment, Identifier [Axis]: Individual FoodService, Capital Goods 7                            
Rate, basis spread on variable rate [10],[19]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%  
Floor [19]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [16],[19]               $ 1,400,000            
Amortized Cost [19]               1,400,000            
Fair Value [2],[19]               $ 1,400,000            
Investment, Identifier [Axis]: Industria Chimica Emiliana Srl, 2                            
Rate, basis spread on variable rate [8],[9],[34] 7.25% 7.25% 7.25% 7.25% 7.25% 7.25% 7.25%              
Floor [8],[9],[34] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%              
Principal Amount | € [9],[15],[34]   € 71.2                        
Amortized Cost [9],[34] $ 82,100,000                          
Fair Value [1],[9],[34] $ 72,000,000.0                          
Investment, Identifier [Axis]: Industria Chimica Emiliana Srl, Pharmaceuticals, Biotechnology & Life Sciences                            
Rate, basis spread on variable rate [10],[13],[29]               7.25% 7.25% 7.25% 7.25% 7.25% 7.25%  
Floor [13],[29]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%  
Principal Amount | € [13],[16],[29]                 € 88.8          
Amortized Cost [13],[29]               $ 102,100,000            
Fair Value [2],[13],[29]               $ 91,300,000            
Investment, Identifier [Axis]: Industria Chimica Emiliana Srl, Pharmaceuticals, Biotechnology & Life Sciences 2                            
Rate, basis spread on variable rate [8],[9],[34] 7.25% 7.25% 7.25% 7.25% 7.25% 7.25% 7.25%              
Floor [8],[9],[34] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%              
Principal Amount | € [9],[15],[34]   € 17.6                        
Amortized Cost [9],[34] $ 20,500,000                          
Fair Value [1],[9],[34] $ 17,800,000                          
Investment, Identifier [Axis]: Industry City TI Lessor LP, Consumer Services                            
Rate, PIK 1.00% [8],[9],[37] 1.00% [8],[9],[37] 1.00% [8],[9],[37] 1.00% [8],[9],[37] 1.00% [8],[9],[37] 1.00% [8],[9],[37] 1.00% [8],[9],[37] 1.00% [10],[13],[38] 1.00% [10],[13],[38] 1.00% [10],[13],[38] 1.00% [10],[13],[38] 1.00% [10],[13],[38] 1.00% [10],[13],[38]  
Rate, Max PIK 1.00% [8],[9],[37] 1.00% [8],[9],[37] 1.00% [8],[9],[37] 1.00% [8],[9],[37] 1.00% [8],[9],[37] 1.00% [8],[9],[37] 1.00% [8],[9],[37] 1.00% [10],[13],[38] 1.00% [10],[13],[38] 1.00% [10],[13],[38] 1.00% [10],[13],[38] 1.00% [10],[13],[38] 1.00% [10],[13],[38]  
Rate, stated interest rate 10.80% [8],[9],[37] 10.80% [8],[9],[37] 10.80% [8],[9],[37] 10.80% [8],[9],[37] 10.80% [8],[9],[37] 10.80% [8],[9],[37] 10.80% [8],[9],[37] 10.80% [10],[13],[38] 10.80% [10],[13],[38] 10.80% [10],[13],[38] 10.80% [10],[13],[38] 10.80% [10],[13],[38] 10.80% [10],[13],[38]  
Principal Amount $ 22,100,000 [9],[15],[37]             $ 25,600,000 [13],[16],[38]            
Amortized Cost 22,100,000 [9],[37]             25,700,000 [13],[38]            
Fair Value $ 22,500,000 [1],[9],[37]             $ 26,000,000.0 [2],[13],[38]            
Investment, Identifier [Axis]: Insight Global LLC, Commercial & Professional Services 1                            
Rate, basis spread on variable rate 6.00% [8],[9],[17] 6.00% [8],[9],[17] 6.00% [8],[9],[17] 6.00% [8],[9],[17] 6.00% [8],[9],[17] 6.00% [8],[9],[17] 6.00% [8],[9],[17] 6.00% [10],[13] 6.00% [10],[13] 6.00% [10],[13] 6.00% [10],[13] 6.00% [10],[13] 6.00% [10],[13]  
Floor 0.80% [8],[9],[17] 0.80% [8],[9],[17] 0.80% [8],[9],[17] 0.80% [8],[9],[17] 0.80% [8],[9],[17] 0.80% [8],[9],[17] 0.80% [8],[9],[17] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13]  
Principal Amount $ 176,800,000 [9],[15],[17]             $ 8,400,000 [13],[16]            
Amortized Cost 175,500,000 [9],[17]             8,400,000 [13]            
Fair Value $ 175,800,000 [1],[9],[17]             $ 8,200,000 [2],[13]            
Investment, Identifier [Axis]: Insight Global LLC, Commercial & Professional Services 2                            
Rate, basis spread on variable rate 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [10],[13],[14] 6.00% [10],[13],[14] 6.00% [10],[13],[14] 6.00% [10],[13],[14] 6.00% [10],[13],[14] 6.00% [10],[13],[14]  
Floor 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [13],[14] 0.80% [13],[14] 0.80% [13],[14] 0.80% [13],[14] 0.80% [13],[14] 0.80% [13],[14]  
Principal Amount $ 21,100,000 [15],[20]             $ 203,300,000 [13],[14],[16]            
Amortized Cost 21,100,000 [20]             201,500,000 [13],[14]            
Fair Value $ 20,800,000 [1],[20]             $ 197,000,000.0 [2],[13],[14]            
Investment, Identifier [Axis]: Insight Global LLC, Commercial & Professional Services 3                            
Rate, basis spread on variable rate 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [10],[19] 6.00% [10],[19] 6.00% [10],[19] 6.00% [10],[19] 6.00% [10],[19] 6.00% [10],[19]  
Floor 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19]  
Principal Amount $ 26,800,000 [15],[20]             $ 12,600,000 [16],[19]            
Amortized Cost 26,800,000 [20]             12,600,000 [19]            
Fair Value $ 26,500,000 [1],[20]             $ 12,200,000 [2],[19]            
Investment, Identifier [Axis]: Insight Global LLC, Commercial & Professional Services 4                            
Rate, basis spread on variable rate [10],[19]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Floor [19]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%  
Principal Amount [16],[19]               $ 26,800,000            
Amortized Cost [19]               26,800,000            
Fair Value [2],[19]               $ 26,000,000.0            
Investment, Identifier [Axis]: Integrity Marketing Group LLC, Insurance                            
Rate, basis spread on variable rate [10],[13]               6.02% 6.02% 6.02% 6.02% 6.02% 6.02%  
Floor [13]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%  
Principal Amount [13],[16]               $ 124,400,000            
Amortized Cost [13]               124,400,000            
Fair Value [2],[13]               $ 122,400,000            
Investment, Identifier [Axis]: Integrity Marketing Group LLC, Insurance 1                            
Rate, basis spread on variable rate [8],[9] 6.02% 6.02% 6.02% 6.02% 6.02% 6.02% 6.02%              
Floor [8],[9] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%              
Principal Amount [9],[15] $ 98,600,000                          
Amortized Cost [9] 98,600,000                          
Fair Value [1],[9] $ 98,500,000                          
Investment, Identifier [Axis]: Integrity Marketing Group LLC, Insurance 2                            
Rate, basis spread on variable rate [8],[20] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%              
Floor [8],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%              
Principal Amount [15],[20] $ 2,500,000                          
Amortized Cost [20] 2,500,000                          
Fair Value [1],[20] $ 2,500,000                          
Investment, Identifier [Axis]: Integrity Marketing Group LLC, Insurance 3                            
Rate, basis spread on variable rate [8],[20] 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%              
Floor [8],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [15],[20] $ 100,000                          
Amortized Cost [20] 100,000                          
Fair Value [1],[20] $ 100,000                          
Investment, Identifier [Axis]: J S Held LLC, Insurance 1                            
Rate, basis spread on variable rate 5.50% [8],[9],[17],[23],[37] 5.50% [8],[9],[17],[23],[37] 5.50% [8],[9],[17],[23],[37] 5.50% [8],[9],[17],[23],[37] 5.50% [8],[9],[17],[23],[37] 5.50% [8],[9],[17],[23],[37] 5.50% [8],[9],[17],[23],[37] 5.50% [10],[13],[14],[21],[38],[42] 5.50% [10],[13],[14],[21],[38],[42] 5.50% [10],[13],[14],[21],[38],[42] 5.50% [10],[13],[14],[21],[38],[42] 5.50% [10],[13],[14],[21],[38],[42] 5.50% [10],[13],[14],[21],[38],[42]  
Floor 1.00% [8],[9],[17],[23],[37] 1.00% [8],[9],[17],[23],[37] 1.00% [8],[9],[17],[23],[37] 1.00% [8],[9],[17],[23],[37] 1.00% [8],[9],[17],[23],[37] 1.00% [8],[9],[17],[23],[37] 1.00% [8],[9],[17],[23],[37] 1.00% [13],[14],[21],[38],[42] 1.00% [13],[14],[21],[38],[42] 1.00% [13],[14],[21],[38],[42] 1.00% [13],[14],[21],[38],[42] 1.00% [13],[14],[21],[38],[42] 1.00% [13],[14],[21],[38],[42]  
Principal Amount $ 102,200,000 [9],[15],[17],[23],[37]             $ 103,000,000.0 [13],[14],[16],[21],[38],[42]            
Amortized Cost 100,700,000 [9],[17],[23],[37]             101,000,000.0 [13],[14],[21],[38],[42]            
Fair Value $ 100,700,000 [1],[9],[17],[23],[37]             $ 101,800,000 [2],[13],[14],[21],[38],[42]            
Investment, Identifier [Axis]: J S Held LLC, Insurance 2                            
Rate, basis spread on variable rate 5.50% [8],[9] 5.50% [8],[9] 5.50% [8],[9] 5.50% [8],[9] 5.50% [8],[9] 5.50% [8],[9] 5.50% [8],[9] 5.50% [10],[13] 5.50% [10],[13] 5.50% [10],[13] 5.50% [10],[13] 5.50% [10],[13] 5.50% [10],[13]  
Floor 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13]  
Principal Amount $ 3,400,000 [9],[15]             $ 8,900,000 [13],[16]            
Amortized Cost 3,300,000 [9]             8,700,000 [13]            
Fair Value $ 3,300,000 [1],[9]             $ 8,800,000 [2],[13]            
Investment, Identifier [Axis]: J S Held LLC, Insurance 3                            
Rate, basis spread on variable rate 5.50% [8],[9] 5.50% [8],[9] 5.50% [8],[9] 5.50% [8],[9] 5.50% [8],[9] 5.50% [8],[9] 5.50% [8],[9] 5.50% [10],[13] 5.50% [10],[13] 5.50% [10],[13] 5.50% [10],[13] 5.50% [10],[13] 5.50% [10],[13]  
Floor 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13]  
Principal Amount $ 22,100,000 [9],[15]             $ 22,200,000 [13],[16]            
Amortized Cost 22,100,000 [9]             22,200,000 [13]            
Fair Value $ 21,700,000 [1],[9]             $ 22,000,000.0 [2],[13]            
Investment, Identifier [Axis]: J S Held LLC, Insurance 4                            
Rate, basis spread on variable rate 5.50% [8],[9],[23] 5.50% [8],[9],[23] 5.50% [8],[9],[23] 5.50% [8],[9],[23] 5.50% [8],[9],[23] 5.50% [8],[9],[23] 5.50% [8],[9],[23] 5.50% [10],[13],[21] 5.50% [10],[13],[21] 5.50% [10],[13],[21] 5.50% [10],[13],[21] 5.50% [10],[13],[21] 5.50% [10],[13],[21]  
Floor 1.00% [8],[9],[23] 1.00% [8],[9],[23] 1.00% [8],[9],[23] 1.00% [8],[9],[23] 1.00% [8],[9],[23] 1.00% [8],[9],[23] 1.00% [8],[9],[23] 1.00% [13],[21] 1.00% [13],[21] 1.00% [13],[21] 1.00% [13],[21] 1.00% [13],[21] 1.00% [13],[21]  
Principal Amount $ 37,200,000 [9],[15],[23]             $ 24,800,000 [13],[16],[21]            
Amortized Cost 37,200,000 [9],[23]             24,800,000 [13],[21]            
Fair Value $ 36,800,000 [1],[9],[23]             $ 24,600,000 [2],[13],[21]            
Investment, Identifier [Axis]: J S Held LLC, Insurance 5                            
Rate, basis spread on variable rate 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [10],[19] 5.50% [10],[19] 5.50% [10],[19] 5.50% [10],[19] 5.50% [10],[19] 5.50% [10],[19]  
Floor 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19]  
Principal Amount $ 10,700,000 [15],[20]             $ 5,200,000 [16],[19]            
Amortized Cost 10,700,000 [20]             5,200,000 [19]            
Fair Value $ 10,600,000 [1],[20]             $ 5,200,000 [2],[19]            
Investment, Identifier [Axis]: J S Held LLC, Insurance 6                            
Rate, basis spread on variable rate 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [10],[19] 5.50% [10],[19] 5.50% [10],[19] 5.50% [10],[19] 5.50% [10],[19] 5.50% [10],[19]  
Floor 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19]  
Principal Amount $ 6,700,000 [15],[20]             $ 19,200,000 [16],[19]            
Amortized Cost 6,700,000 [20]             19,200,000 [19]            
Fair Value 6,600,000 [1],[20]             19,000,000.0 [2],[19]            
Investment, Identifier [Axis]: JW Aluminum Co                            
Fair Value $ 76,000,000.0             78,100,000           81,000,000.0
Investment, Identifier [Axis]: JW Aluminum Co, Common Stock                            
Fair Value               $ 2,400,000           0
Investment, Identifier [Axis]: JW Aluminum Co, Common Stock, Materials                            
Principal (in shares) | shares 2,105 [9],[33],[35],[53],[55] 2,105 [9],[33],[35],[53],[55] 2,105 [9],[33],[35],[53],[55] 2,105 [9],[33],[35],[53],[55] 2,105 [9],[33],[35],[53],[55] 2,105 [9],[33],[35],[53],[55] 2,105 [9],[33],[35],[53],[55] 2,105 [13],[28],[36],[54],[58] 2,105 [13],[28],[36],[54],[58] 2,105 [13],[28],[36],[54],[58] 2,105 [13],[28],[36],[54],[58] 2,105 [13],[28],[36],[54],[58] 2,105 [13],[28],[36],[54],[58]  
Amortized Cost $ 0.0 [9],[33],[35],[53],[55]             $ 0.0 [13],[28],[36],[54],[58]            
Fair Value $ 2,400,000 [1],[9],[33],[35],[53],[55]             $ 2,400,000 [2],[13],[28],[36],[54],[58]            
Investment, Identifier [Axis]: JW Aluminum Co, Materials                            
Rate, stated interest rate 10.30% [8],[9],[35],[37],[40] 10.30% [8],[9],[35],[37],[40] 10.30% [8],[9],[35],[37],[40] 10.30% [8],[9],[35],[37],[40] 10.30% [8],[9],[35],[37],[40] 10.30% [8],[9],[35],[37],[40] 10.30% [8],[9],[35],[37],[40] 10.30% [10],[13],[36],[38],[41] 10.30% [10],[13],[36],[38],[41] 10.30% [10],[13],[36],[38],[41] 10.30% [10],[13],[36],[38],[41] 10.30% [10],[13],[36],[38],[41] 10.30% [10],[13],[36],[38],[41]  
Principal Amount $ 76,500,000 [9],[15],[35],[37],[40]             $ 76,500,000 [13],[16],[36],[38],[41]            
Amortized Cost 75,800,000 [9],[35],[37],[40]             75,700,000 [13],[36],[38],[41]            
Fair Value $ 76,000,000.0 [1],[9],[35],[37],[40]             78,100,000 [2],[13],[36],[38],[41]            
Investment, Identifier [Axis]: JW Aluminum Co, Preferred Stock                            
Fair Value               $ 112,500,000           122,600,000
Investment, Identifier [Axis]: JW Aluminum Co, Preferred Stock, Materials                            
Rate, PIK 6.30% [8],[9],[35],[53],[55] 6.30% [8],[9],[35],[53],[55] 6.30% [8],[9],[35],[53],[55] 6.30% [8],[9],[35],[53],[55] 6.30% [8],[9],[35],[53],[55] 6.30% [8],[9],[35],[53],[55] 6.30% [8],[9],[35],[53],[55] 6.30% [10],[58] 6.30% [10],[58] 6.30% [10],[58] 6.30% [10],[58] 6.30% [10],[58] 6.30% [10],[58]  
Rate, Max PIK 12.50% [8],[9],[35],[53],[55] 12.50% [8],[9],[35],[53],[55] 12.50% [8],[9],[35],[53],[55] 12.50% [8],[9],[35],[53],[55] 12.50% [8],[9],[35],[53],[55] 12.50% [8],[9],[35],[53],[55] 12.50% [8],[9],[35],[53],[55] 12.50% [10],[58] 12.50% [10],[58] 12.50% [10],[58] 12.50% [10],[58] 12.50% [10],[58] 12.50% [10],[58]  
Principal (in shares) | shares 15,279 [9],[35],[53],[55] 15,279 [9],[35],[53],[55] 15,279 [9],[35],[53],[55] 15,279 [9],[35],[53],[55] 15,279 [9],[35],[53],[55] 15,279 [9],[35],[53],[55] 15,279 [9],[35],[53],[55] 15,279 [36],[58] 15,279 [36],[58] 15,279 [36],[58] 15,279 [36],[58] 15,279 [36],[58] 15,279 [36],[58]  
Amortized Cost $ 213,900,000 [9],[35],[53],[55]             $ 200,100,000 [36],[58]            
Fair Value $ 148,200,000 [1],[9],[35],[53],[55]             $ 112,500,000 [2],[36],[58]            
Investment, Identifier [Axis]: Jarrow Formulas Inc, Household & Personal Products                            
Rate, basis spread on variable rate [10],[11],[12],[13],[14],[21],[22],[38],[42]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%  
Floor [11],[12],[13],[14],[21],[22],[38],[42]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [11],[12],[13],[14],[16],[21],[22],[38],[42]               $ 181,800,000            
Amortized Cost [11],[12],[13],[14],[21],[22],[38],[42]               174,100,000            
Fair Value [2],[11],[12],[13],[14],[21],[22],[38],[42]               181,300,000            
Investment, Identifier [Axis]: Jet Edge International LLC, Structured Mezzanine, Transportation 1                            
Rate, PIK [8],[9] 2.00% 2.00% 2.00% 2.00% 2.00% 2.00% 2.00%              
Rate, Max PIK [8],[9] 2.00% 2.00% 2.00% 2.00% 2.00% 2.00% 2.00%              
Rate, stated interest rate [8],[9] 10.00% 10.00% 10.00% 10.00% 10.00% 10.00% 10.00%              
Principal Amount [9],[15] $ 49,900,000                          
Amortized Cost [9] 49,900,000                          
Fair Value [1],[9] $ 50,900,000                          
Investment, Identifier [Axis]: Jet Edge International LLC, Structured Mezzanine, Transportation 2                            
Rate, PIK [8],[9] 2.00% 2.00% 2.00% 2.00% 2.00% 2.00% 2.00%              
Rate, Max PIK [8],[9] 2.00% 2.00% 2.00% 2.00% 2.00% 2.00% 2.00%              
Rate, stated interest rate [8],[9] 10.00% 10.00% 10.00% 10.00% 10.00% 10.00% 10.00%              
Principal Amount [9],[15] $ 700,000                          
Amortized Cost [9] 700,000                          
Fair Value [1],[9] $ 700,000                          
Investment, Identifier [Axis]: Jet Edge International LLC, Term Loan , Asset Based Finance                            
Fair Value               $ 0           75,600,000
Investment, Identifier [Axis]: Jet Edge International LLC, Term Loan, Transportation 1                            
Rate, PIK [10],[13]               2.00% 2.00% 2.00% 2.00% 2.00% 2.00%  
Rate, Max PIK [10],[13]               2.00% 2.00% 2.00% 2.00% 2.00% 2.00%  
Rate, stated interest rate [10],[13]               10.00% 10.00% 10.00% 10.00% 10.00% 10.00%  
Principal Amount [13],[16]               $ 74,500,000            
Amortized Cost [13]               74,500,000            
Fair Value [2],[13]               $ 76,700,000            
Investment, Identifier [Axis]: Jet Edge International LLC, Term Loan, Transportation 2                            
Rate, PIK [10],[19]               2.00% 2.00% 2.00% 2.00% 2.00% 2.00%  
Rate, Max PIK [10],[19]               2.00% 2.00% 2.00% 2.00% 2.00% 2.00%  
Rate, stated interest rate [10],[19]               10.00% 10.00% 10.00% 10.00% 10.00% 10.00%  
Principal Amount [16],[19]               $ 700,000            
Amortized Cost [19]               700,000            
Fair Value [2],[19]               700,000            
Investment, Identifier [Axis]: Jet Edge International LLC, Warrant, Asset Based Finance                            
Fair Value               $ 0           4,500,000
Investment, Identifier [Axis]: Jones Apparel Holdings, Inc., Common Stock, Consumer Durables & Apparel                            
Principal (in shares) | shares [9],[33] 5,451 5,451 5,451 5,451 5,451 5,451 5,451 5,451 5,451 5,451 5,451 5,451 5,451  
Amortized Cost [9],[33] $ 900,000             $ 900,000            
Fair Value [9],[33] $ 0 [1]             0 [2]            
Investment, Identifier [Axis]: KKR Altitude II Offshore Aggregator LP, Partnership Interest                            
Fair Value               $ 44,400,000           0
Investment, Identifier [Axis]: KKR Altitude II Offshore Aggregator LP, Partnership Interest, Capital Goods                            
Principal (in shares) | shares 48,431,521 [9],[15],[34],[35] 48,431,521 [9],[15],[34],[35] 48,431,521 [9],[15],[34],[35] 48,431,521 [9],[15],[34],[35] 48,431,521 [9],[15],[34],[35] 48,431,521 [9],[15],[34],[35] 48,431,521 [9],[15],[34],[35] 44,424,346 [13],[16],[28],[29],[36] 44,424,346 [13],[16],[28],[29],[36] 44,424,346 [13],[16],[28],[29],[36] 44,424,346 [13],[16],[28],[29],[36] 44,424,346 [13],[16],[28],[29],[36] 44,424,346 [13],[16],[28],[29],[36]  
Amortized Cost $ 48,400,000 [9],[34],[35]             $ 44,400,000 [13],[28],[29],[36]            
Fair Value $ 50,000,000.0 [1],[9],[34],[35]             $ 44,400,000 [2],[13],[28],[29],[36]            
Investment, Identifier [Axis]: KKR Central Park Leasing Aggregator L.P., Partnership Interest, Capital Goods                            
Rate, stated interest rate 14.30% [8],[9],[30],[33],[34] 14.30% [8],[9],[30],[33],[34] 14.30% [8],[9],[30],[33],[34] 14.30% [8],[9],[30],[33],[34] 14.30% [8],[9],[30],[33],[34] 14.30% [8],[9],[30],[33],[34] 14.30% [8],[9],[30],[33],[34] 14.30% [10],[13],[25],[28],[29] 14.30% [10],[13],[25],[28],[29] 14.30% [10],[13],[25],[28],[29] 14.30% [10],[13],[25],[28],[29] 14.30% [10],[13],[25],[28],[29] 14.30% [10],[13],[25],[28],[29]  
Principal Amount $ 39,100,000 [9],[15],[30],[33],[34]             $ 39,100,000 [13],[16],[25],[28],[29]            
Amortized Cost 39,100,000 [9],[30],[33],[34]             39,100,000 [13],[25],[28],[29]            
Fair Value $ 15,900,000 [1],[9],[30],[33],[34]             $ 16,300,000 [2],[13],[25],[28],[29]            
Investment, Identifier [Axis]: KKR Chord IP Aggregator LP, Partnership Interest, Media & Entertainment                            
Principal (in shares) | shares 89,453,083 [9],[15],[34] 89,453,083 [9],[15],[34] 89,453,083 [9],[15],[34] 89,453,083 [9],[15],[34] 89,453,083 [9],[15],[34] 89,453,083 [9],[15],[34] 89,453,083 [9],[15],[34] 89,453,083 [13],[16],[29] 89,453,083 [13],[16],[29] 89,453,083 [13],[16],[29] 89,453,083 [13],[16],[29] 89,453,083 [13],[16],[29] 89,453,083 [13],[16],[29]  
Amortized Cost $ 89,500,000 [9],[34]             $ 89,500,000 [13],[29]            
Fair Value $ 98,100,000 [1],[9],[34]             $ 96,300,000 [2],[13],[29]            
Investment, Identifier [Axis]: KKR Residential Opportunities I LLC, Private Equity, Real Estate                            
Principal (in shares) | shares [13],[16],[28]               17,510,867 17,510,867 17,510,867 17,510,867 17,510,867 17,510,867  
Amortized Cost [13],[28]               $ 17,500,000            
Fair Value [2],[13],[28]               17,600,000            
Investment, Identifier [Axis]: KKR Residential Opportunities I LLC, Private Equity, Real Estate Management & Development                            
Principal (in shares) | shares [9],[15] 10,510,932 10,510,932 10,510,932 10,510,932 10,510,932 10,510,932 10,510,932              
Amortized Cost [9] $ 10,500,000                          
Fair Value [1],[9] 13,000,000.0                          
Investment, Identifier [Axis]: KKR Rocket Loans Aggregator LLC, Partnership Interest                            
Fair Value $ 8,400,000             $ 4,300,000           1,400,000
Investment, Identifier [Axis]: KKR Rocket Loans Aggregator LLC, Partnership Interest, Diversified Financials                            
Principal (in shares) | shares [13],[16],[29],[36]               4,336,415 4,336,415 4,336,415 4,336,415 4,336,415 4,336,415  
Amortized Cost [13],[29],[36]               $ 4,300,000            
Fair Value [2],[13],[29],[36]               $ 4,300,000            
Investment, Identifier [Axis]: KKR Rocket Loans Aggregator LLC, Partnership Interest, Financial Services                            
Principal (in shares) | shares [9],[15],[34],[35] 10,618,892 10,618,892 10,618,892 10,618,892 10,618,892 10,618,892 10,618,892              
Amortized Cost [9],[34],[35] $ 10,600,000                          
Fair Value [1],[9],[34],[35] $ 8,400,000                          
Investment, Identifier [Axis]: KKR Zeno Aggregator LP (K2 Aviation), Partnership Interest, Capital Goods                            
Principal (in shares) | shares 23,664,954 [9],[15],[33],[34] 23,664,954 [9],[15],[33],[34] 23,664,954 [9],[15],[33],[34] 23,664,954 [9],[15],[33],[34] 23,664,954 [9],[15],[33],[34] 23,664,954 [9],[15],[33],[34] 23,664,954 [9],[15],[33],[34] 23,664,954 [13],[16],[28],[29] 23,664,954 [13],[16],[28],[29] 23,664,954 [13],[16],[28],[29] 23,664,954 [13],[16],[28],[29] 23,664,954 [13],[16],[28],[29] 23,664,954 [13],[16],[28],[29]  
Amortized Cost $ 23,000,000.0 [9],[33],[34]             $ 23,000,000.0 [13],[28],[29]            
Fair Value $ 21,500,000 [1],[9],[33],[34]             $ 20,000,000.0 [2],[13],[28],[29]            
Investment, Identifier [Axis]: Karman Space Inc, Capital Goods 3                            
Rate, basis spread on variable rate [8],[9] 7.00% 7.00% 7.00% 7.00% 7.00% 7.00% 7.00%              
Floor [8],[9] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [9],[15] $ 36,400,000                          
Amortized Cost [9] 35,900,000                          
Fair Value [1],[9] $ 36,400,000                          
Investment, Identifier [Axis]: Karman Space Inc, Capital Goods 1                            
Rate, basis spread on variable rate 7.00% [8],[9] 7.00% [8],[9] 7.00% [8],[9] 7.00% [8],[9] 7.00% [8],[9] 7.00% [8],[9] 7.00% [8],[9] 7.00% [10],[13],[42] 7.00% [10],[13],[42] 7.00% [10],[13],[42] 7.00% [10],[13],[42] 7.00% [10],[13],[42] 7.00% [10],[13],[42]  
Floor 2.00% [8],[9] 2.00% [8],[9] 2.00% [8],[9] 2.00% [8],[9] 2.00% [8],[9] 2.00% [8],[9] 2.00% [8],[9] 1.00% [13],[42] 1.00% [13],[42] 1.00% [13],[42] 1.00% [13],[42] 1.00% [13],[42] 1.00% [13],[42]  
Principal Amount $ 50,100,000 [9],[15]             $ 51,100,000 [13],[16],[42]            
Amortized Cost 48,400,000 [9]             48,900,000 [13],[42]            
Fair Value $ 50,100,000 [1],[9]             $ 49,700,000 [2],[13],[42]            
Investment, Identifier [Axis]: Karman Space Inc, Capital Goods 2                            
Rate, basis spread on variable rate 7.00% [8],[9] 7.00% [8],[9] 7.00% [8],[9] 7.00% [8],[9] 7.00% [8],[9] 7.00% [8],[9] 7.00% [8],[9] 7.00% [10],[13] 7.00% [10],[13] 7.00% [10],[13] 7.00% [10],[13] 7.00% [10],[13] 7.00% [10],[13]  
Floor 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13]  
Principal Amount $ 4,000,000.0 [9],[15]             $ 4,500,000 [13],[16]            
Amortized Cost 3,800,000 [9]             4,300,000 [13]            
Fair Value $ 4,000,000.0 [1],[9]             $ 4,400,000 [2],[13]            
Investment, Identifier [Axis]: Karman Space Inc, Capital Goods 3                            
Rate, basis spread on variable rate [10],[13]               7.00% 7.00% 7.00% 7.00% 7.00% 7.00%  
Floor [13]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [13],[16]               $ 37,100,000            
Amortized Cost [13]               36,600,000            
Fair Value [2],[13]               $ 36,100,000            
Investment, Identifier [Axis]: Karman Space Inc, Capital Goods 4                            
Rate, basis spread on variable rate 7.00% [8],[20] 7.00% [8],[20] 7.00% [8],[20] 7.00% [8],[20] 7.00% [8],[20] 7.00% [8],[20] 7.00% [8],[20] 7.00% [10],[19] 7.00% [10],[19] 7.00% [10],[19] 7.00% [10],[19] 7.00% [10],[19] 7.00% [10],[19]  
Floor 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19]  
Principal Amount $ 1,500,000 [15],[20]             $ 1,000,000.0 [16],[19]            
Amortized Cost 1,500,000 [20]             1,000,000.0 [19]            
Fair Value $ 1,500,000 [1],[20]             $ 900,000 [2],[19]            
Investment, Identifier [Axis]: Kellermeyer Bergensons Services LLC, Commercial & Professional Services                            
Rate, basis spread on variable rate [8],[9],[17],[18],[23],[24],[37],[43] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%              
Floor [8],[9],[17],[18],[23],[24],[37],[43] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [9],[15],[17],[18],[23],[24],[37],[43] $ 366,100,000                          
Amortized Cost [9],[17],[18],[23],[24],[37],[43] 357,600,000                          
Fair Value [1],[9],[17],[18],[23],[24],[37],[43] 344,500,000                          
Investment, Identifier [Axis]: Kellermeyer Bergensons Services LLC, Commercial & Professional Services 1                            
Rate, basis spread on variable rate [10],[11],[12],[13],[14],[21],[22],[38],[42]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Floor [11],[12],[13],[14],[21],[22],[38],[42]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [11],[12],[13],[14],[16],[21],[22],[38],[42]               $ 268,900,000            
Amortized Cost [11],[12],[13],[14],[21],[22],[38],[42]               259,500,000            
Fair Value [2],[11],[12],[13],[14],[21],[22],[38],[42]               $ 244,600,000            
Investment, Identifier [Axis]: Kellermeyer Bergensons Services LLC, Commercial & Professional Services 2                            
Rate, basis spread on variable rate [10],[13]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Floor [13]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [13],[16]               $ 84,600,000            
Amortized Cost [13]               84,100,000            
Fair Value [2],[13]               $ 77,000,000.0            
Investment, Identifier [Axis]: Kellermeyer Bergensons Services LLC, Commercial & Professional Services 3                            
Rate, basis spread on variable rate [10],[13]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Floor [13]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [13],[16]               $ 15,400,000            
Amortized Cost [13]               15,300,000            
Fair Value [2],[13]               14,000,000.0            
Investment, Identifier [Axis]: Kilter Finance, Preferred Stock                            
Fair Value $ 99,700,000             $ 99,500,000           36,100,000
Investment, Identifier [Axis]: Kilter Finance, Preferred Stock, Insurance                            
Rate, stated interest rate 12.00% [8],[9],[34],[35] 12.00% [8],[9],[34],[35] 12.00% [8],[9],[34],[35] 12.00% [8],[9],[34],[35] 12.00% [8],[9],[34],[35] 12.00% [8],[9],[34],[35] 12.00% [8],[9],[34],[35] 12.00% [10],[13],[29],[36] 12.00% [10],[13],[29],[36] 12.00% [10],[13],[29],[36] 12.00% [10],[13],[29],[36] 12.00% [10],[13],[29],[36] 12.00% [10],[13],[29],[36]  
Principal Amount $ 99,700,000 [9],[15],[34],[35]             $ 99,400,000 [13],[16],[29],[36]            
Amortized Cost 98,900,000 [9],[34],[35]             98,600,000 [13],[29],[36]            
Fair Value 99,700,000 [1],[9],[34],[35]             99,500,000 [2],[13],[29],[36]            
Investment, Identifier [Axis]: Kilter Finance, Private Equity                            
Fair Value $ 500,000             $ 500,000           500,000
Investment, Identifier [Axis]: Kilter Finance, Private Equity, Insurance                            
Principal (in shares) | shares 536,709 [9],[15],[33],[34],[35] 536,709 [9],[15],[33],[34],[35] 536,709 [9],[15],[33],[34],[35] 536,709 [9],[15],[33],[34],[35] 536,709 [9],[15],[33],[34],[35] 536,709 [9],[15],[33],[34],[35] 536,709 [9],[15],[33],[34],[35] 536,709 [13],[16],[28],[29],[36] 536,709 [13],[16],[28],[29],[36] 536,709 [13],[16],[28],[29],[36] 536,709 [13],[16],[28],[29],[36] 536,709 [13],[16],[28],[29],[36] 536,709 [13],[16],[28],[29],[36]  
Amortized Cost $ 500,000 [9],[33],[34],[35]             $ 500,000 [13],[28],[29],[36]            
Fair Value $ 500,000 [1],[9],[33],[34],[35]             $ 500,000 [2],[13],[28],[29],[36]            
Investment, Identifier [Axis]: Laboratoires Vivacy SAS, Pharmaceuticals, Biotechnology & Life Sciences 1                            
Rate, basis spread on variable rate [8],[9],[34] 6.75% 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%              
Rate, PIK [8],[9],[34] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%              
Rate, Max PIK [8],[9],[34] 2.40% 2.40% 2.40% 2.40% 2.40% 2.40% 2.40%              
Floor [8],[9],[34] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%              
Principal Amount | € [9],[15],[34]   € 7.8                        
Amortized Cost [9],[34] $ 8,000,000.0                          
Fair Value [1],[9],[34] $ 8,100,000                          
Investment, Identifier [Axis]: Laboratoires Vivacy SAS, Pharmaceuticals, Biotechnology & Life Sciences 2                            
Rate, basis spread on variable rate [8],[20],[34] 6.75% 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%              
Rate, PIK [8],[20],[34] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%              
Rate, Max PIK [8],[20],[34] 2.40% 2.40% 2.40% 2.40% 2.40% 2.40% 2.40%              
Floor [8],[20],[34] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%              
Principal Amount | € [15],[20],[34]   € 0.6                        
Amortized Cost [20],[34] $ 700,000                          
Fair Value [1],[20],[34] $ 600,000                          
Investment, Identifier [Axis]: Lakefield Veterinary Group, Health Care Equipment & Services 1                            
Rate, basis spread on variable rate 5.50% [8],[9] 5.50% [8],[9] 5.50% [8],[9] 5.50% [8],[9] 5.50% [8],[9] 5.50% [8],[9] 5.50% [8],[9] 5.50% [10],[13],[14],[21] 5.50% [10],[13],[14],[21] 5.50% [10],[13],[14],[21] 5.50% [10],[13],[14],[21] 5.50% [10],[13],[14],[21] 5.50% [10],[13],[14],[21]  
Floor 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [13],[14],[21] 0.80% [13],[14],[21] 0.80% [13],[14],[21] 0.80% [13],[14],[21] 0.80% [13],[14],[21] 0.80% [13],[14],[21]  
Principal Amount $ 33,600,000 [9],[15]             $ 108,300,000 [13],[14],[16],[21]            
Amortized Cost 33,600,000 [9]             107,600,000 [13],[14],[21]            
Fair Value $ 32,600,000 [1],[9]             $ 103,800,000 [2],[13],[14],[21]            
Investment, Identifier [Axis]: Lakefield Veterinary Group, Health Care Equipment & Services 2                            
Rate, basis spread on variable rate 5.50% [8],[9],[17],[23],[43] 5.50% [8],[9],[17],[23],[43] 5.50% [8],[9],[17],[23],[43] 5.50% [8],[9],[17],[23],[43] 5.50% [8],[9],[17],[23],[43] 5.50% [8],[9],[17],[23],[43] 5.50% [8],[9],[17],[23],[43] 5.50% [10],[19] 5.50% [10],[19] 5.50% [10],[19] 5.50% [10],[19] 5.50% [10],[19] 5.50% [10],[19]  
Floor 0.80% [8],[9],[17],[23],[43] 0.80% [8],[9],[17],[23],[43] 0.80% [8],[9],[17],[23],[43] 0.80% [8],[9],[17],[23],[43] 0.80% [8],[9],[17],[23],[43] 0.80% [8],[9],[17],[23],[43] 0.80% [8],[9],[17],[23],[43] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19]  
Principal Amount $ 80,600,000 [9],[15],[17],[23],[43]             $ 35,200,000 [16],[19]            
Amortized Cost 80,000,000.0 [9],[17],[23],[43]             35,200,000 [19]            
Fair Value $ 78,200,000 [1],[9],[17],[23],[43]             $ 33,700,000 [2],[19]            
Investment, Identifier [Axis]: Lakefield Veterinary Group, Health Care Equipment & Services 3                            
Rate, basis spread on variable rate [8],[20] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%              
Floor [8],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%              
Principal Amount [15],[20] $ 28,500,000                          
Amortized Cost [20] 28,500,000                          
Fair Value [1],[20] $ 27,600,000                          
Investment, Identifier [Axis]: Lakeview Farms Inc, Food, Beverage & Tobacco 1                            
Rate, basis spread on variable rate 6.25% [8],[18],[43] 6.25% [8],[18],[43] 6.25% [8],[18],[43] 6.25% [8],[18],[43] 6.25% [8],[18],[43] 6.25% [8],[18],[43] 6.25% [8],[18],[43] 6.25% [10],[12],[42] 6.25% [10],[12],[42] 6.25% [10],[12],[42] 6.25% [10],[12],[42] 6.25% [10],[12],[42] 6.25% [10],[12],[42]  
Floor 1.00% [8],[18],[43] 1.00% [8],[18],[43] 1.00% [8],[18],[43] 1.00% [8],[18],[43] 1.00% [8],[18],[43] 1.00% [8],[18],[43] 1.00% [8],[18],[43] 1.00% [12],[42] 1.00% [12],[42] 1.00% [12],[42] 1.00% [12],[42] 1.00% [12],[42] 1.00% [12],[42]  
Principal Amount $ 31,000,000.0 [15],[18],[43]             $ 31,200,000 [12],[16],[42]            
Amortized Cost 29,600,000 [18],[43]             29,600,000 [12],[42]            
Fair Value $ 30,700,000 [1],[18],[43]             $ 30,200,000 [2],[12],[42]            
Investment, Identifier [Axis]: Lakeview Farms Inc, Food, Beverage & Tobacco 2                            
Rate, basis spread on variable rate 6.25% [8],[9],[43] 6.25% [8],[9],[43] 6.25% [8],[9],[43] 6.25% [8],[9],[43] 6.25% [8],[9],[43] 6.25% [8],[9],[43] 6.25% [8],[9],[43] 6.25% [10],[13] 6.25% [10],[13] 6.25% [10],[13] 6.25% [10],[13] 6.25% [10],[13] 6.25% [10],[13]  
Floor 1.00% [8],[9],[43] 1.00% [8],[9],[43] 1.00% [8],[9],[43] 1.00% [8],[9],[43] 1.00% [8],[9],[43] 1.00% [8],[9],[43] 1.00% [8],[9],[43] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13]  
Principal Amount $ 37,000,000.0 [9],[15],[43]             $ 4,500,000 [13],[16]            
Amortized Cost 37,000,000.0 [9],[43]             4,500,000 [13]            
Fair Value $ 36,700,000 [1],[9],[43]             $ 4,300,000 [2],[13]            
Investment, Identifier [Axis]: Lakeview Farms Inc, Food, Beverage & Tobacco 3                            
Rate, basis spread on variable rate 6.25% [8],[20] 6.25% [8],[20] 6.25% [8],[20] 6.25% [8],[20] 6.25% [8],[20] 6.25% [8],[20] 6.25% [8],[20] 6.25% [10],[13],[42] 6.25% [10],[13],[42] 6.25% [10],[13],[42] 6.25% [10],[13],[42] 6.25% [10],[13],[42] 6.25% [10],[13],[42]  
Floor 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [13],[42] 1.00% [13],[42] 1.00% [13],[42] 1.00% [13],[42] 1.00% [13],[42] 1.00% [13],[42]  
Principal Amount $ 6,800,000 [15],[20]             $ 45,000,000.0 [13],[16],[42]            
Amortized Cost 6,800,000 [20]             45,000,000.0 [13],[42]            
Fair Value $ 6,700,000 [1],[20]             $ 43,600,000 [2],[13],[42]            
Investment, Identifier [Axis]: Lakeview Farms Inc, Food, Beverage & Tobacco 4                            
Rate, basis spread on variable rate [10],[19]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%  
Floor [19]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [16],[19]               $ 10,800,000            
Amortized Cost [19]               10,800,000            
Fair Value [2],[19]               $ 10,500,000            
Investment, Identifier [Axis]: Lakeview Farms Inc, Food, Beverage & Tobacco 5                            
Rate, basis spread on variable rate [10],[19]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%  
Floor [19]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [16],[19]               $ 2,300,000            
Amortized Cost [19]               2,300,000            
Fair Value [2],[19]               $ 2,200,000            
Investment, Identifier [Axis]: Lazer Logistics Inc, Transportation 1                            
Rate, basis spread on variable rate [8],[9] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%              
Floor [8],[9] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%              
Principal Amount [9],[15] $ 300,000                          
Amortized Cost [9] 300,000                          
Fair Value [1],[9] $ 300,000                          
Investment, Identifier [Axis]: Lazer Logistics Inc, Transportation 2                            
Rate, basis spread on variable rate [8],[9] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%              
Floor [8],[9] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%              
Principal Amount [9],[15] $ 15,800,000                          
Amortized Cost [9] 15,600,000                          
Fair Value [1],[9] $ 15,800,000                          
Investment, Identifier [Axis]: Lazer Logistics Inc, Transportation 3                            
Rate, basis spread on variable rate [8],[20] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%              
Floor [8],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%              
Principal Amount [15],[20] $ 1,700,000                          
Amortized Cost [20] 1,700,000                          
Fair Value [1],[20] $ 1,700,000                          
Investment, Identifier [Axis]: Lazer Logistics Inc, Transportation 4                            
Rate, basis spread on variable rate [8],[20] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%              
Floor [8],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%              
Principal Amount [15],[20] $ 2,400,000                          
Amortized Cost [20] 2,400,000                          
Fair Value [1],[20] $ 2,400,000                          
Investment, Identifier [Axis]: Lexitas Inc, Commercial & Professional Services 1                            
Rate, basis spread on variable rate 6.75% [8],[20] 6.75% [8],[20] 6.75% [8],[20] 6.75% [8],[20] 6.75% [8],[20] 6.75% [8],[20] 6.75% [8],[20] 6.75% [10],[11],[12],[13],[14],[42] 6.75% [10],[11],[12],[13],[14],[42] 6.75% [10],[11],[12],[13],[14],[42] 6.75% [10],[11],[12],[13],[14],[42] 6.75% [10],[11],[12],[13],[14],[42] 6.75% [10],[11],[12],[13],[14],[42]  
Floor 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [11],[12],[13],[14],[42] 1.00% [11],[12],[13],[14],[42] 1.00% [11],[12],[13],[14],[42] 1.00% [11],[12],[13],[14],[42] 1.00% [11],[12],[13],[14],[42] 1.00% [11],[12],[13],[14],[42]  
Principal Amount $ 2,900,000 [15],[20]             $ 133,100,000 [11],[12],[13],[14],[16],[42]            
Amortized Cost 2,900,000 [20]             130,200,000 [11],[12],[13],[14],[42]            
Fair Value $ 2,900,000 [1],[20]             $ 131,100,000 [2],[11],[12],[13],[14],[42]            
Investment, Identifier [Axis]: Lexitas Inc, Commercial & Professional Services 2                            
Rate, basis spread on variable rate 6.75% [8],[9],[17],[18],[43] 6.75% [8],[9],[17],[18],[43] 6.75% [8],[9],[17],[18],[43] 6.75% [8],[9],[17],[18],[43] 6.75% [8],[9],[17],[18],[43] 6.75% [8],[9],[17],[18],[43] 6.75% [8],[9],[17],[18],[43] 6.75% [10],[19] 6.75% [10],[19] 6.75% [10],[19] 6.75% [10],[19] 6.75% [10],[19] 6.75% [10],[19]  
Floor 1.00% [8],[9],[17],[18],[43] 1.00% [8],[9],[17],[18],[43] 1.00% [8],[9],[17],[18],[43] 1.00% [8],[9],[17],[18],[43] 1.00% [8],[9],[17],[18],[43] 1.00% [8],[9],[17],[18],[43] 1.00% [8],[9],[17],[18],[43] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19]  
Principal Amount $ 117,100,000 [9],[15],[17],[18],[43]             $ 8,400,000 [16],[19]            
Amortized Cost 114,400,000 [9],[17],[18],[43]             8,400,000 [19]            
Fair Value $ 117,600,000 [1],[9],[17],[18],[43]             $ 8,300,000 [2],[19]            
Investment, Identifier [Axis]: Lexitas Inc, Commercial & Professional Services 3                            
Rate, basis spread on variable rate [8],[20] 6.75% 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%              
Floor [8],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [15],[20] $ 5,500,000                          
Amortized Cost [20] 5,500,000                          
Fair Value [1],[20] $ 5,500,000                          
Investment, Identifier [Axis]: Lionbridge Technologies Inc, Media & Entertainment                            
Rate, basis spread on variable rate 7.00% [8],[9],[18],[23],[24],[37] 7.00% [8],[9],[18],[23],[24],[37] 7.00% [8],[9],[18],[23],[24],[37] 7.00% [8],[9],[18],[23],[24],[37] 7.00% [8],[9],[18],[23],[24],[37] 7.00% [8],[9],[18],[23],[24],[37] 7.00% [8],[9],[18],[23],[24],[37] 7.00% [10],[11],[13],[21],[22],[38],[42] 7.00% [10],[11],[13],[21],[22],[38],[42] 7.00% [10],[11],[13],[21],[22],[38],[42] 7.00% [10],[11],[13],[21],[22],[38],[42] 7.00% [10],[11],[13],[21],[22],[38],[42] 7.00% [10],[11],[13],[21],[22],[38],[42]  
Floor 1.00% [8],[9],[18],[23],[24],[37] 1.00% [8],[9],[18],[23],[24],[37] 1.00% [8],[9],[18],[23],[24],[37] 1.00% [8],[9],[18],[23],[24],[37] 1.00% [8],[9],[18],[23],[24],[37] 1.00% [8],[9],[18],[23],[24],[37] 1.00% [8],[9],[18],[23],[24],[37] 1.00% [11],[13],[21],[22],[38],[42] 1.00% [11],[13],[21],[22],[38],[42] 1.00% [11],[13],[21],[22],[38],[42] 1.00% [11],[13],[21],[22],[38],[42] 1.00% [11],[13],[21],[22],[38],[42] 1.00% [11],[13],[21],[22],[38],[42]  
Principal Amount $ 112,800,000 [9],[15],[18],[23],[24],[37]             $ 122,700,000 [11],[13],[16],[21],[22],[38],[42]            
Amortized Cost 110,100,000 [9],[18],[23],[24],[37]             119,000,000.0 [11],[13],[21],[22],[38],[42]            
Fair Value $ 111,800,000 [1],[9],[18],[23],[24],[37]             $ 123,400,000 [2],[11],[13],[21],[22],[38],[42]            
Investment, Identifier [Axis]: Lipari Foods LLC, Common Stock, Consumer Staples Distribution & Retail                            
Principal (in shares) | shares [9],[33] 7,942,724 7,942,724 7,942,724 7,942,724 7,942,724 7,942,724 7,942,724              
Amortized Cost [9],[33] $ 8,000,000.0                          
Fair Value [1],[9],[33] $ 7,600,000                          
Investment, Identifier [Axis]: Lipari Foods LLC, Common Stock, Food & Staples Retailing                            
Principal (in shares) | shares [9],[33]               7,936,123 7,936,123 7,936,123 7,936,123 7,936,123 7,936,123  
Amortized Cost [9],[33]               $ 8,000,000.0            
Fair Value [2],[9],[33]               $ 8,000,000.0            
Investment, Identifier [Axis]: Lipari Foods LLC, Consumer Staples Distribution & Retail 1                            
Rate, basis spread on variable rate [8],[9],[17],[23],[43] 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%              
Floor [8],[9],[17],[23],[43] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [9],[15],[17],[23],[43] $ 100,800,000                          
Amortized Cost [9],[17],[23],[43] 99,600,000                          
Fair Value [1],[9],[17],[23],[43] $ 101,400,000                          
Investment, Identifier [Axis]: Lipari Foods LLC, Consumer Staples Distribution & Retail 2                            
Rate, basis spread on variable rate [8],[20] 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%              
Floor [8],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [15],[20] $ 15,000,000.0                          
Amortized Cost [20] 15,000,000.0                          
Fair Value [1],[20] $ 15,100,000                          
Investment, Identifier [Axis]: Lipari Foods LLC, Food & Staples Retailing 1                            
Rate, basis spread on variable rate [10],[13],[14],[21]               6.50% 6.50% 6.50% 6.50% 6.50% 6.50%  
Floor [13],[14],[21]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [13],[14],[16],[21]               $ 96,000,000.0            
Amortized Cost [13],[14],[21]               94,600,000            
Fair Value [2],[13],[14],[21]               $ 94,900,000            
Investment, Identifier [Axis]: Lipari Foods LLC, Food & Staples Retailing 2                            
Rate, basis spread on variable rate [10],[19]               6.50% 6.50% 6.50% 6.50% 6.50% 6.50%  
Floor [19]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [16],[19]               $ 27,300,000            
Amortized Cost [19]               27,300,000            
Fair Value [2],[19]               $ 27,000,000.0            
Investment, Identifier [Axis]: Lloyd's Register Quality Assurance Ltd, Consumer Services 1                            
Rate, basis spread on variable rate 6.00% [8],[9],[34] 6.00% [8],[9],[34] 6.00% [8],[9],[34] 6.00% [8],[9],[34] 6.00% [8],[9],[34] 6.00% [8],[9],[34] 6.00% [8],[9],[34] 5.75% [10],[13],[29] 5.75% [10],[13],[29] 5.75% [10],[13],[29] 5.75% [10],[13],[29] 5.75% [10],[13],[29] 5.75% [10],[13],[29]  
Rate, PIK 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [10],[13],[29] 0.00% [10],[13],[29] 0.00% [10],[13],[29] 0.00% [10],[13],[29] 0.00% [10],[13],[29] 0.00% [10],[13],[29]  
Rate, Max PIK 2.90% [8],[9],[34] 2.90% [8],[9],[34] 2.90% [8],[9],[34] 2.90% [8],[9],[34] 2.90% [8],[9],[34] 2.90% [8],[9],[34] 2.90% [8],[9],[34] 2.90% [10],[13],[29] 2.90% [10],[13],[29] 2.90% [10],[13],[29] 2.90% [10],[13],[29] 2.90% [10],[13],[29] 2.90% [10],[13],[29]  
Floor 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [13],[29] 0.00% [13],[29] 0.00% [13],[29] 0.00% [13],[29] 0.00% [13],[29] 0.00% [13],[29]  
Principal Amount | £         £ 11.3 [9],[15],[34]             £ 5.7 [13],[16],[29]    
Amortized Cost $ 14,400,000 [9],[34]             $ 7,400,000 [13],[29]            
Fair Value $ 13,500,000 [1],[9],[34]             $ 6,700,000 [2],[13],[29]            
Investment, Identifier [Axis]: Lloyd's Register Quality Assurance Ltd, Consumer Services 2                            
Rate, basis spread on variable rate 6.00% [8],[20],[34] 6.00% [8],[20],[34] 6.00% [8],[20],[34] 6.00% [8],[20],[34] 6.00% [8],[20],[34] 6.00% [8],[20],[34] 6.00% [8],[20],[34] 5.75% [10] 5.75% [10] 5.75% [10] 5.75% [10] 5.75% [10] 5.75% [10]  
Rate, PIK 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [8],[20],[34] 2.90% [10] 2.90% [10] 2.90% [10] 2.90% [10] 2.90% [10] 2.90% [10]  
Rate, Max PIK 2.90% [8],[20],[34] 2.90% [8],[20],[34] 2.90% [8],[20],[34] 2.90% [8],[20],[34] 2.90% [8],[20],[34] 2.90% [8],[20],[34] 2.90% [8],[20],[34] 0.00% [10],[19],[29] 0.00% [10],[19],[29] 0.00% [10],[19],[29] 0.00% [10],[19],[29] 0.00% [10],[19],[29] 0.00% [10],[19],[29]  
Floor 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [8],[20],[34] 0.00% [19],[29] 0.00% [19],[29] 0.00% [19],[29] 0.00% [19],[29] 0.00% [19],[29] 0.00% [19],[29]  
Principal Amount | £         £ 3.7 [15],[20],[34]             £ 9.3 [16],[19],[29]    
Amortized Cost $ 5,700,000 [20],[34]             $ 12,600,000 [19],[29]            
Fair Value $ 5,600,000 [1],[20],[34]             $ 12,300,000 [2],[19],[29]            
Investment, Identifier [Axis]: Luxembourg Life Fund - Absolute Return Fund II, Structured Mezzanine, Insurance                            
Rate, basis spread on variable rate [10],[13],[29]               7.50% 7.50% 7.50% 7.50% 7.50% 7.50%  
Floor [13],[29]               0.50% 0.50% 0.50% 0.50% 0.50% 0.50%  
Principal Amount [13],[16],[29]               $ 24,900,000            
Amortized Cost [13],[29]               24,900,000            
Fair Value [2],[13],[29]               $ 24,600,000            
Investment, Identifier [Axis]: MB Precision Holdings LLC, Class A - 2 Units, Capital Goods                            
Principal (in shares) | shares [28],[52],[57]               8,081,288 8,081,288 8,081,288 8,081,288 8,081,288 8,081,288  
Amortized Cost [28],[52],[57]               $ 500,000            
Fair Value [2],[28],[52],[57]               $ 0            
Investment, Identifier [Axis]: MB2 Dental Solutions LLC, Health Care Equipment & Services                            
Rate, basis spread on variable rate 6.00% [8],[9],[18],[24],[43] 6.00% [8],[9],[18],[24],[43] 6.00% [8],[9],[18],[24],[43] 6.00% [8],[9],[18],[24],[43] 6.00% [8],[9],[18],[24],[43] 6.00% [8],[9],[18],[24],[43] 6.00% [8],[9],[18],[24],[43] 6.00% [10],[11],[12],[13],[22],[42] 6.00% [10],[11],[12],[13],[22],[42] 6.00% [10],[11],[12],[13],[22],[42] 6.00% [10],[11],[12],[13],[22],[42] 6.00% [10],[11],[12],[13],[22],[42] 6.00% [10],[11],[12],[13],[22],[42]  
Floor 1.00% [8],[9],[18],[24],[43] 1.00% [8],[9],[18],[24],[43] 1.00% [8],[9],[18],[24],[43] 1.00% [8],[9],[18],[24],[43] 1.00% [8],[9],[18],[24],[43] 1.00% [8],[9],[18],[24],[43] 1.00% [8],[9],[18],[24],[43] 1.00% [11],[12],[13],[22],[42] 1.00% [11],[12],[13],[22],[42] 1.00% [11],[12],[13],[22],[42] 1.00% [11],[12],[13],[22],[42] 1.00% [11],[12],[13],[22],[42] 1.00% [11],[12],[13],[22],[42]  
Principal Amount $ 220,800,000 [9],[15],[18],[24],[43]             $ 268,000,000.0 [11],[12],[13],[16],[22],[42]            
Amortized Cost 215,000,000.0 [9],[18],[24],[43]             259,200,000 [11],[12],[13],[22],[42]            
Fair Value $ 218,600,000 [1],[9],[18],[24],[43]             $ 263,600,000 [2],[11],[12],[13],[22],[42]            
Investment, Identifier [Axis]: Magna Legal Services LLC, Commercial & Professional Services 1                            
Rate, basis spread on variable rate 6.50% [8],[9],[43] 6.50% [8],[9],[43] 6.50% [8],[9],[43] 6.50% [8],[9],[43] 6.50% [8],[9],[43] 6.50% [8],[9],[43] 6.50% [8],[9],[43] 6.50% [10],[13] 6.50% [10],[13] 6.50% [10],[13] 6.50% [10],[13] 6.50% [10],[13] 6.50% [10],[13]  
Floor 0.80% [8],[9],[43] 0.80% [8],[9],[43] 0.80% [8],[9],[43] 0.80% [8],[9],[43] 0.80% [8],[9],[43] 0.80% [8],[9],[43] 0.80% [8],[9],[43] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13]  
Principal Amount $ 22,900,000 [9],[15],[43]             $ 18,500,000 [13],[16]            
Amortized Cost 22,700,000 [9],[43]             18,200,000 [13]            
Fair Value $ 23,000,000.0 [1],[9],[43]             $ 18,200,000 [2],[13]            
Investment, Identifier [Axis]: Magna Legal Services LLC, Commercial & Professional Services 2                            
Rate, basis spread on variable rate 6.50% [8],[20] 6.50% [8],[20] 6.50% [8],[20] 6.50% [8],[20] 6.50% [8],[20] 6.50% [8],[20] 6.50% [8],[20] 6.50% [10],[19] 6.50% [10],[19] 6.50% [10],[19] 6.50% [10],[19] 6.50% [10],[19] 6.50% [10],[19]  
Floor 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19]  
Principal Amount $ 2,200,000 [15],[20]             $ 2,200,000 [16],[19]            
Amortized Cost 2,200,000 [20]             2,200,000 [19]            
Fair Value $ 2,200,000 [1],[20]             $ 2,100,000 [2],[19]            
Investment, Identifier [Axis]: Magna Legal Services LLC, Commercial & Professional Services 3                            
Rate, basis spread on variable rate 6.50% [8],[20] 6.50% [8],[20] 6.50% [8],[20] 6.50% [8],[20] 6.50% [8],[20] 6.50% [8],[20] 6.50% [8],[20] 6.50% [10],[19] 6.50% [10],[19] 6.50% [10],[19] 6.50% [10],[19] 6.50% [10],[19] 6.50% [10],[19]  
Floor 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19]  
Principal Amount $ 600,000 [15],[20]             $ 5,200,000 [16],[19]            
Amortized Cost 600,000 [20]             5,200,000 [19]            
Fair Value $ 600,000 [1],[20]             $ 5,100,000 [2],[19]            
Investment, Identifier [Axis]: Magna Legal Services LLC, Common Stock, Commercial & Professional Services                            
Principal (in shares) | shares 4,938,192 [33],[47] 4,938,192 [33],[47] 4,938,192 [33],[47] 4,938,192 [33],[47] 4,938,192 [33],[47] 4,938,192 [33],[47] 4,938,192 [33],[47] 4,938,192 [28],[48] 4,938,192 [28],[48] 4,938,192 [28],[48] 4,938,192 [28],[48] 4,938,192 [28],[48] 4,938,192 [28],[48]  
Amortized Cost $ 4,900,000 [33],[47]             $ 4,900,000 [28],[48]            
Fair Value $ 5,600,000 [1],[33],[47]             $ 4,900,000 [2],[28],[48]            
Investment, Identifier [Axis]: Matchesfashion Ltd, Consumer Durables & Apparel                            
Rate, basis spread on variable rate 7.63% [8],[9],[30],[33],[34] 7.63% [8],[9],[30],[33],[34] 7.63% [8],[9],[30],[33],[34] 7.63% [8],[9],[30],[33],[34] 7.63% [8],[9],[30],[33],[34] 7.63% [8],[9],[30],[33],[34] 7.63% [8],[9],[30],[33],[34] 4.63% [10],[13],[25],[28],[29] 4.63% [10],[13],[25],[28],[29] 4.63% [10],[13],[25],[28],[29] 4.63% [10],[13],[25],[28],[29] 4.63% [10],[13],[25],[28],[29] 4.63% [10],[13],[25],[28],[29]  
Rate, PIK [10],[13],[25],[28],[29]               3.00% 3.00% 3.00% 3.00% 3.00% 3.00%  
Rate, Max PIK 7.63% [8],[9],[30],[33],[34] 7.63% [8],[9],[30],[33],[34] 7.63% [8],[9],[30],[33],[34] 7.63% [8],[9],[30],[33],[34] 7.63% [8],[9],[30],[33],[34] 7.63% [8],[9],[30],[33],[34] 7.63% [8],[9],[30],[33],[34] 3.00% [10],[13],[25],[28],[29] 3.00% [10],[13],[25],[28],[29] 3.00% [10],[13],[25],[28],[29] 3.00% [10],[13],[25],[28],[29] 3.00% [10],[13],[25],[28],[29] 3.00% [10],[13],[25],[28],[29]  
Floor 0.00% [8],[9],[30],[33],[34] 0.00% [8],[9],[30],[33],[34] 0.00% [8],[9],[30],[33],[34] 0.00% [8],[9],[30],[33],[34] 0.00% [8],[9],[30],[33],[34] 0.00% [8],[9],[30],[33],[34] 0.00% [8],[9],[30],[33],[34] 0.00% [13],[25],[28],[29] 0.00% [13],[25],[28],[29] 0.00% [13],[25],[28],[29] 0.00% [13],[25],[28],[29] 0.00% [13],[25],[28],[29] 0.00% [13],[25],[28],[29]  
Principal Amount $ 13,500,000 [9],[15],[30],[33],[34]             $ 13,300,000 [13],[16],[25],[28],[29]            
Amortized Cost 11,600,000 [9],[30],[33],[34]             12,200,000 [13],[25],[28],[29]            
Fair Value $ 700,000 [1],[9],[30],[33],[34]             $ 4,800,000 [2],[13],[25],[28],[29]            
Investment, Identifier [Axis]: Maverick Natural Resources LLC, Common Stock, Energy                            
Principal (in shares) | shares [51],[56] 259,211 259,211 259,211 259,211 259,211 259,211 259,211 259,211 259,211 259,211 259,211 259,211 259,211  
Amortized Cost [51],[56] $ 84,500,000             $ 84,600,000            
Fair Value [51],[56] $ 128,900,000 [1]             $ 160,900,000 [2]            
Investment, Identifier [Axis]: Med-Metrix, Common Stock, Software & Services                            
Principal (in shares) | shares 29,403 [33],[47] 29,403 [33],[47] 29,403 [33],[47] 29,403 [33],[47] 29,403 [33],[47] 29,403 [33],[47] 29,403 [33],[47] 29,403 [28],[48] 29,403 [28],[48] 29,403 [28],[48] 29,403 [28],[48] 29,403 [28],[48] 29,403 [28],[48]  
Amortized Cost $ 1,500,000 [33],[47]             $ 1,500,000 [28],[48]            
Fair Value $ 3,600,000 [1],[33],[47]             $ 2,900,000 [2],[28],[48]            
Investment, Identifier [Axis]: Med-Metrix, Preferred Stock, Software & Services                            
Rate, PIK 8.00% [8] 8.00% [8] 8.00% [8] 8.00% [8] 8.00% [8] 8.00% [8] 8.00% [8] 8.00% [10],[48] 8.00% [10],[48] 8.00% [10],[48] 8.00% [10],[48] 8.00% [10],[48] 8.00% [10],[48]  
Rate, Max PIK 8.00% [8] 8.00% [8] 8.00% [8] 8.00% [8] 8.00% [8] 8.00% [8] 8.00% [8] 8.00% [10],[48] 8.00% [10],[48] 8.00% [10],[48] 8.00% [10],[48] 8.00% [10],[48] 8.00% [10],[48]  
Principal (in shares) | shares 29,403 [47] 29,403 [47] 29,403 [47] 29,403 [47] 29,403 [47] 29,403 [47] 29,403 [47] 29,403 [48] 29,403 [48] 29,403 [48] 29,403 [48] 29,403 [48] 29,403 [48]  
Amortized Cost $ 1,500,000 [47]             $ 1,500,000 [48]            
Fair Value $ 1,500,000 [1],[47]             $ 1,500,000 [2],[48]            
Investment, Identifier [Axis]: Med-Metrix, Software & Services 1                            
Rate, basis spread on variable rate 6.00% [8],[9],[17],[24],[43] 6.00% [8],[9],[17],[24],[43] 6.00% [8],[9],[17],[24],[43] 6.00% [8],[9],[17],[24],[43] 6.00% [8],[9],[17],[24],[43] 6.00% [8],[9],[17],[24],[43] 6.00% [8],[9],[17],[24],[43] 6.00% [10],[13],[14],[22] 6.00% [10],[13],[14],[22] 6.00% [10],[13],[14],[22] 6.00% [10],[13],[14],[22] 6.00% [10],[13],[14],[22] 6.00% [10],[13],[14],[22]  
Floor 1.00% [8],[9],[17],[24],[43] 1.00% [8],[9],[17],[24],[43] 1.00% [8],[9],[17],[24],[43] 1.00% [8],[9],[17],[24],[43] 1.00% [8],[9],[17],[24],[43] 1.00% [8],[9],[17],[24],[43] 1.00% [8],[9],[17],[24],[43] 1.00% [13],[14],[22] 1.00% [13],[14],[22] 1.00% [13],[14],[22] 1.00% [13],[14],[22] 1.00% [13],[14],[22] 1.00% [13],[14],[22]  
Principal Amount $ 66,400,000 [9],[15],[17],[24],[43]             $ 56,100,000 [13],[14],[16],[22]            
Amortized Cost 66,000,000.0 [9],[17],[24],[43]             56,100,000 [13],[14],[22]            
Fair Value $ 66,400,000 [1],[9],[17],[24],[43]             $ 56,600,000 [2],[13],[14],[22]            
Investment, Identifier [Axis]: Med-Metrix, Software & Services 2                            
Rate, basis spread on variable rate 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [10],[19] 6.00% [10],[19] 6.00% [10],[19] 6.00% [10],[19] 6.00% [10],[19] 6.00% [10],[19]  
Floor 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19]  
Principal Amount $ 14,200,000 [15],[20]             $ 25,000,000.0 [16],[19]            
Amortized Cost 14,200,000 [20]             25,000,000.0 [19]            
Fair Value $ 14,200,000 [1],[20]             $ 25,300,000 [2],[19]            
Investment, Identifier [Axis]: Med-Metrix, Software & Services 3                            
Rate, basis spread on variable rate 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [10],[19] 6.00% [10],[19] 6.00% [10],[19] 6.00% [10],[19] 6.00% [10],[19] 6.00% [10],[19]  
Floor 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19]  
Principal Amount $ 7,800,000 [15],[20]             $ 7,800,000 [16],[19]            
Amortized Cost 7,800,000 [20]             7,800,000 [19]            
Fair Value $ 7,800,000 [1],[20]             $ 7,800,000 [2],[19]            
Investment, Identifier [Axis]: Medallia Inc, Software & Services                            
Rate, basis spread on variable rate [10],[13]               3.25% 3.25% 3.25% 3.25% 3.25% 3.25%  
Rate, PIK [10],[13]               3.30% 3.30% 3.30% 3.30% 3.30% 3.30%  
Rate, Max PIK [10],[13]               3.30% 3.30% 3.30% 3.30% 3.30% 3.30%  
Floor [13]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%  
Principal Amount [13],[16]               $ 207,800,000            
Amortized Cost [13]               205,800,000            
Fair Value [2],[13]               $ 203,000,000.0            
Investment, Identifier [Axis]: Medallia Inc, Software & Services 1                            
Rate, basis spread on variable rate [8],[9],[43] 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00%              
Rate, PIK [8],[9],[43] 3.50% 3.50% 3.50% 3.50% 3.50% 3.50% 3.50%              
Rate, Max PIK [8],[9],[43] 3.50% 3.50% 3.50% 3.50% 3.50% 3.50% 3.50%              
Floor [8],[9],[43] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%              
Principal Amount [9],[15],[43] $ 185,900,000                          
Amortized Cost [9],[43] 184,500,000                          
Fair Value [1],[9],[43] $ 183,800,000                          
Investment, Identifier [Axis]: Medallia Inc, Software & Services 2                            
Rate, basis spread on variable rate [8],[9] 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00%              
Rate, PIK [8],[9] 3.50% 3.50% 3.50% 3.50% 3.50% 3.50% 3.50%              
Rate, Max PIK [8],[9] 3.50% 3.50% 3.50% 3.50% 3.50% 3.50% 3.50%              
Floor [8],[9] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%              
Principal Amount [9],[15] $ 31,100,000                          
Amortized Cost [9] 30,600,000                          
Fair Value [1],[9] $ 30,800,000                          
Investment, Identifier [Axis]: Miami Beach Medical Group LLC, Common Stock, Health Care Equipment & Services                            
Principal (in shares) | shares [9],[33]               5,000,000 5,000,000 5,000,000 5,000,000 5,000,000 5,000,000  
Amortized Cost [9],[33]               $ 4,800,000            
Fair Value [2],[9],[33]               $ 0            
Investment, Identifier [Axis]: Miami Beach Medical Group LLC, Health Care Equipment & Services                            
Rate, basis spread on variable rate [10],[13],[42]               6.50% 6.50% 6.50% 6.50% 6.50% 6.50%  
Rate, PIK [10],[13],[42]               1.50% 1.50% 1.50% 1.50% 1.50% 1.50%  
Rate, Max PIK [10],[13],[42]               1.50% 1.50% 1.50% 1.50% 1.50% 1.50%  
Floor [13],[42]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [13],[16],[42]               $ 164,400,000            
Amortized Cost [13],[42]               157,100,000            
Fair Value [2],[13],[42]               139,800,000            
Investment, Identifier [Axis]: Miami Beach Medical Group LLC, Health Care Equipment & Services 1                            
Rate, basis spread on variable rate [8],[9],[43] 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%              
Rate, PIK [8],[9],[43] 1.50% 1.50% 1.50% 1.50% 1.50% 1.50% 1.50%              
Rate, Max PIK [8],[9],[43] 1.50% 1.50% 1.50% 1.50% 1.50% 1.50% 1.50%              
Floor [8],[9],[43] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [9],[15],[43] $ 114,100,000                          
Amortized Cost [9],[43] 110,000,000.0                          
Fair Value [1],[9],[43] $ 96,900,000                          
Investment, Identifier [Axis]: Miami Beach Medical Group LLC, Health Care Equipment & Services 2                            
Rate, basis spread on variable rate [8],[9] 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%              
Rate, PIK [8] 1.50% 1.50% 1.50% 1.50% 1.50% 1.50% 1.50%              
Rate, Max PIK [8] 1.50% 1.50% 1.50% 1.50% 1.50% 1.50% 1.50%              
Floor [8],[9] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [9],[15] $ 18,900,000                          
Amortized Cost [9] 18,100,000                          
Fair Value [1],[9] 16,100,000                          
Investment, Identifier [Axis]: Miami Beach Medical Group LLC, Health Care Equipment & Services 3                            
Principal Amount [9],[15],[33] 5,400,000                          
Amortized Cost [9],[33] 3,600,000                          
Fair Value [1],[9],[33] $ 1,600,000                          
Investment, Identifier [Axis]: Micronics Filtration Holdings Inc, Common Stock, Equity/Other                            
Fair Value               0           0
Investment, Identifier [Axis]: Micronics Filtration Holdings Inc, Senior Secured Loans—First Lien                            
Fair Value               $ 0           51,000,000.0
Investment, Identifier [Axis]: Misys Ltd, Preferred Stock, Software & Services                            
Rate, PIK 11.25% [8],[9],[34] 11.25% [8],[9],[34] 11.25% [8],[9],[34] 11.25% [8],[9],[34] 11.25% [8],[9],[34] 11.25% [8],[9],[34] 11.25% [8],[9],[34] 10.25% [10],[13],[29] 10.25% [10],[13],[29] 10.25% [10],[13],[29] 10.25% [10],[13],[29] 10.25% [10],[13],[29] 10.25% [10],[13],[29]  
Rate, Max PIK 11.25% [8],[9],[34] 11.25% [8],[9],[34] 11.25% [8],[9],[34] 11.25% [8],[9],[34] 11.25% [8],[9],[34] 11.25% [8],[9],[34] 11.25% [8],[9],[34] 10.25% [10],[13],[29] 10.25% [10],[13],[29] 10.25% [10],[13],[29] 10.25% [10],[13],[29] 10.25% [10],[13],[29] 10.25% [10],[13],[29]  
Floor [9],[34] 0.00% [8] 0.00% [8] 0.00% [8] 0.00% [8] 0.00% [8] 0.00% [8] 0.00% [8] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%  
Principal (in shares) | shares 73,683,516 [9],[34] 73,683,516 [9],[34] 73,683,516 [9],[34] 73,683,516 [9],[34] 73,683,516 [9],[34] 73,683,516 [9],[34] 73,683,516 [9],[34] 65,200,765 [13],[29] 65,200,765 [13],[29] 65,200,765 [13],[29] 65,200,765 [13],[29] 65,200,765 [13],[29] 65,200,765 [13],[29]  
Amortized Cost $ 69,600,000 [9],[34]             $ 61,100,000 [13],[29]            
Fair Value $ 69,300,000 [1],[9],[34]             $ 61,100,000 [2],[13],[29]            
Investment, Identifier [Axis]: Misys Ltd, Software & Services                            
Rate, basis spread on variable rate [10],[13],[29],[41]               7.25% 7.25% 7.25% 7.25% 7.25% 7.25%  
Floor [13],[29],[41]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [13],[16],[29],[41]               $ 16,300,000            
Amortized Cost [13],[29],[41]               15,600,000            
Fair Value [2],[13],[29],[41]               $ 12,300,000            
Investment, Identifier [Axis]: Misys Ltd, Software & Services 1                            
Rate, basis spread on variable rate [8],[9],[34] 7.25% 7.25% 7.25% 7.25% 7.25% 7.25% 7.25%              
Floor [8],[9],[34] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [9],[15],[34] $ 14,800,000                          
Amortized Cost [9],[34] 14,500,000                          
Fair Value [1],[9],[34] $ 14,500,000                          
Investment, Identifier [Axis]: Misys Ltd, Software & Services 2                            
Rate, basis spread on variable rate [8],[9],[34] 7.25% 7.25% 7.25% 7.25% 7.25% 7.25% 7.25%              
Floor [8],[9],[34] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [9],[15],[34] $ 300,000                          
Amortized Cost [9],[34] 300,000                          
Fair Value [1],[9],[34] $ 300,000                          
Investment, Identifier [Axis]: Misys Ltd, Software & Services 3                            
Rate, basis spread on variable rate [8],[20],[34] 7.25% 7.25% 7.25% 7.25% 7.25% 7.25% 7.25%              
Floor [8],[20],[34] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [15],[20],[34] $ 1,200,000                          
Amortized Cost [20],[34] 1,200,000                          
Fair Value [1],[20],[34] $ 1,200,000                          
Investment, Identifier [Axis]: Monitronics International Inc, Commercial & Professional Services 1                            
Rate, basis spread on variable rate [10],[13],[21],[41]               7.50% 7.50% 7.50% 7.50% 7.50% 7.50%  
Floor [13],[21],[41]               1.30% 1.30% 1.30% 1.30% 1.30% 1.30%  
Principal Amount [13],[16],[21],[41]               $ 18,600,000            
Amortized Cost [13],[21],[41]               17,700,000            
Fair Value [2],[13],[21],[41]               $ 12,500,000            
Investment, Identifier [Axis]: Monitronics International Inc, Commercial & Professional Services 2                            
Rate, basis spread on variable rate [10],[13]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Floor [13]               1.50% 1.50% 1.50% 1.50% 1.50% 1.50%  
Principal Amount [13],[16]               $ 46,100,000            
Amortized Cost [13]               44,300,000            
Fair Value [2],[13]               $ 42,300,000            
Investment, Identifier [Axis]: Monitronics International Inc, Commercial & Professional Services 3                            
Rate, basis spread on variable rate [10],[19]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Floor [19]               1.50% 1.50% 1.50% 1.50% 1.50% 1.50%  
Principal Amount [16],[19]               $ 23,900,000            
Amortized Cost [19]               23,900,000            
Fair Value [2],[19]               $ 21,900,000            
Investment, Identifier [Axis]: Motion Recruitment Partners LLC, Commercial & Professional Services 1                            
Rate, basis spread on variable rate 6.50% [8],[9],[17],[23] 6.50% [8],[9],[17],[23] 6.50% [8],[9],[17],[23] 6.50% [8],[9],[17],[23] 6.50% [8],[9],[17],[23] 6.50% [8],[9],[17],[23] 6.50% [8],[9],[17],[23] 6.50% [10],[13],[14],[21] 6.50% [10],[13],[14],[21] 6.50% [10],[13],[14],[21] 6.50% [10],[13],[14],[21] 6.50% [10],[13],[14],[21] 6.50% [10],[13],[14],[21]  
Floor 1.00% [8],[9],[17],[23] 1.00% [8],[9],[17],[23] 1.00% [8],[9],[17],[23] 1.00% [8],[9],[17],[23] 1.00% [8],[9],[17],[23] 1.00% [8],[9],[17],[23] 1.00% [8],[9],[17],[23] 1.00% [13],[14],[21] 1.00% [13],[14],[21] 1.00% [13],[14],[21] 1.00% [13],[14],[21] 1.00% [13],[14],[21] 1.00% [13],[14],[21]  
Principal Amount $ 62,100,000 [9],[15],[17],[23]             $ 64,000,000.0 [13],[14],[16],[21]            
Amortized Cost 62,100,000 [9],[17],[23]             64,000,000.0 [13],[14],[21]            
Fair Value $ 60,600,000 [1],[9],[17],[23]             $ 63,600,000 [2],[13],[14],[21]            
Investment, Identifier [Axis]: Motion Recruitment Partners LLC, Commercial & Professional Services 2                            
Rate, basis spread on variable rate 6.50% [8],[9],[24] 6.50% [8],[9],[24] 6.50% [8],[9],[24] 6.50% [8],[9],[24] 6.50% [8],[9],[24] 6.50% [8],[9],[24] 6.50% [8],[9],[24] 6.50% [10],[13],[22],[42] 6.50% [10],[13],[22],[42] 6.50% [10],[13],[22],[42] 6.50% [10],[13],[22],[42] 6.50% [10],[13],[22],[42] 6.50% [10],[13],[22],[42]  
Floor 1.00% [8],[9],[24] 1.00% [8],[9],[24] 1.00% [8],[9],[24] 1.00% [8],[9],[24] 1.00% [8],[9],[24] 1.00% [8],[9],[24] 1.00% [8],[9],[24] 1.00% [13],[22],[42] 1.00% [13],[22],[42] 1.00% [13],[22],[42] 1.00% [13],[22],[42] 1.00% [13],[22],[42] 1.00% [13],[22],[42]  
Principal Amount $ 53,000,000.0 [9],[15],[24]             $ 59,400,000 [13],[16],[22],[42]            
Amortized Cost 50,400,000 [9],[24]             55,800,000 [13],[22],[42]            
Fair Value $ 51,700,000 [1],[9],[24]             $ 59,000,000.0 [2],[13],[22],[42]            
Investment, Identifier [Axis]: Motion Recruitment Partners LLC, Commercial & Professional Services 3                            
Rate, basis spread on variable rate 6.50% [8],[9] 6.50% [8],[9] 6.50% [8],[9] 6.50% [8],[9] 6.50% [8],[9] 6.50% [8],[9] 6.50% [8],[9] 6.50% [10],[19] 6.50% [10],[19] 6.50% [10],[19] 6.50% [10],[19] 6.50% [10],[19] 6.50% [10],[19]  
Floor 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19]  
Principal Amount $ 4,600,000 [9],[15]             $ 59,600,000 [16],[19]            
Amortized Cost 4,600,000 [9]             59,600,000 [19]            
Fair Value 4,500,000 [1],[9]             59,200,000 [2],[19]            
Investment, Identifier [Axis]: My Community Homes PropCo 2, Private Equity                            
Fair Value $ 79,600,000             $ 79,000,000.0            
Investment, Identifier [Axis]: My Community Homes PropCo 2, Private Equity, Equity Real Estate Investment Trusts (REITs)                            
Principal (in shares) | shares [9],[15],[33],[34],[35] 81,136,364 81,136,364 81,136,364 81,136,364 81,136,364 81,136,364 81,136,364              
Amortized Cost [9],[33],[34],[35] $ 81,100,000                          
Fair Value [1],[9],[33],[34],[35] 79,600,000                          
Investment, Identifier [Axis]: My Community Homes PropCo 2, Private Equity, Real Estate                            
Principal (in shares) | shares [13],[28],[29],[36]               84,291,667 84,291,667 84,291,667 84,291,667 84,291,667 84,291,667  
Amortized Cost [13],[28],[29],[36]               $ 84,300,000            
Fair Value [2],[13],[28],[29],[36]               79,000,000.0            
Investment, Identifier [Axis]: My Community Homes SFR PropCo 2, Private Equity                            
Fair Value               79,000,000.0           33,000,000.0
Investment, Identifier [Axis]: NBG Home 1                            
Fair Value 10,100,000             0            
Investment, Identifier [Axis]: NBG Home 2                            
Fair Value 10,500,000             0            
Investment, Identifier [Axis]: NBG Home 3                            
Fair Value 0             $ 0            
Investment, Identifier [Axis]: NBG Home, Common Stock, Consumer Durables & Apparel                            
Principal (in shares) | shares [9],[33]               1,903 1,903 1,903 1,903 1,903 1,903  
Amortized Cost [9],[33]               $ 2,400,000            
Fair Value [2],[9],[33]               $ 0            
Investment, Identifier [Axis]: NBG Home, Consumer Durables & Apparel                            
Rate, PIK [10],[13],[25],[28]               12.75% 12.75% 12.75% 12.75% 12.75% 12.75%  
Rate, Max PIK [10],[13],[25],[28]               12.75% 12.75% 12.75% 12.75% 12.75% 12.75%  
Floor [13],[25],[28]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [13],[16],[25],[28]               $ 35,800,000            
Amortized Cost [13],[25],[28]               28,200,000            
Fair Value [2],[13],[25],[28]               $ 0            
Investment, Identifier [Axis]: NBG Home, Consumer Durables & Apparel 1                            
Rate, basis spread on variable rate [10],[13],[25],[28]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%  
Floor [13],[25],[28]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount 10,100,000 [9],[15],[33],[35]             $ 75,900,000 [13],[16],[25],[28]            
Amortized Cost 10,100,000 [9],[33],[35]             69,900,000 [13],[25],[28]            
Fair Value $ 10,100,000 [1],[9],[33],[35]             21,200,000 [2],[13],[25],[28]            
Investment, Identifier [Axis]: NBG Home, Consumer Durables & Apparel 2                            
Rate, PIK [8],[9],[30],[33],[35] 10.00% 10.00% 10.00% 10.00% 10.00% 10.00% 10.00%              
Rate, Max PIK [8],[9],[30],[33],[35] 10.00% 10.00% 10.00% 10.00% 10.00% 10.00% 10.00%              
Floor [8],[9],[30],[33],[35] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [9],[15],[30],[33],[35] $ 32,700,000                          
Amortized Cost [9],[30],[33],[35] 30,700,000                          
Fair Value [1],[9],[30],[33],[35] $ 10,500,000                          
Investment, Identifier [Axis]: NBG Home, Consumer Durables & Apparel 3                            
Rate, basis spread on variable rate [8],[9],[30],[33],[35] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%              
Floor [8],[9],[30],[33],[35] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [9],[15],[30],[33],[35] $ 44,300,000                          
Amortized Cost [9],[30],[33],[35] 38,700,000                          
Fair Value [1],[9],[30],[33],[35] 0                          
Investment, Identifier [Axis]: NCI Inc                            
Fair Value $ 31,100,000             28,100,000           0
Investment, Identifier [Axis]: NCI Inc, Class A-1 Common Stock                            
Fair Value [59]               $ 0           0
Investment, Identifier [Axis]: NCI Inc, Class A-1 Common Stock, Software & Services                            
Principal (in shares) | shares 42,923 [9],[33],[35] 42,923 [9],[33],[35] 42,923 [9],[33],[35] 42,923 [9],[33],[35] 42,923 [9],[33],[35] 42,923 [9],[33],[35] 42,923 [9],[33],[35] 42,923 [13],[28],[36] 42,923 [13],[28],[36] 42,923 [13],[28],[36] 42,923 [13],[28],[36] 42,923 [13],[28],[36] 42,923 [13],[28],[36]  
Amortized Cost $ 0 [9],[33],[35]             $ 0 [13],[28],[36]            
Fair Value $ 0 [1],[9],[33],[35]             0 [2],[13],[28],[36]            
Investment, Identifier [Axis]: NCI Inc, Class B-1 Common Stock                            
Fair Value [59]               $ 0           0
Investment, Identifier [Axis]: NCI Inc, Class B-1 Common Stock, Software & Services                            
Principal (in shares) | shares 30,121 [9],[33],[35] 30,121 [9],[33],[35] 30,121 [9],[33],[35] 30,121 [9],[33],[35] 30,121 [9],[33],[35] 30,121 [9],[33],[35] 30,121 [9],[33],[35] 30,121 [13],[28],[36] 30,121 [13],[28],[36] 30,121 [13],[28],[36] 30,121 [13],[28],[36] 30,121 [13],[28],[36] 30,121 [13],[28],[36]  
Amortized Cost $ 0 [9],[33],[35]             $ 0 [13],[28],[36]            
Fair Value $ 0 [1],[9],[33],[35]             0 [2],[13],[28],[36]            
Investment, Identifier [Axis]: NCI Inc, Class C Common Stock                            
Fair Value [59]               $ 20,200,000           0
Investment, Identifier [Axis]: NCI Inc, Class C Common Stock, Software & Services                            
Principal (in shares) | shares 49,406 [9],[33],[35] 49,406 [9],[33],[35] 49,406 [9],[33],[35] 49,406 [9],[33],[35] 49,406 [9],[33],[35] 49,406 [9],[33],[35] 49,406 [9],[33],[35] 49,406 [13],[28],[36] 49,406 [13],[28],[36] 49,406 [13],[28],[36] 49,406 [13],[28],[36] 49,406 [13],[28],[36] 49,406 [13],[28],[36]  
Amortized Cost $ 20,200,000 [9],[33],[35]             $ 20,200,000 [13],[28],[36]            
Fair Value $ 19,300,000 [1],[9],[33],[35]             20,200,000 [2],[13],[28],[36]            
Investment, Identifier [Axis]: NCI Inc, Class I-1 Common Stock                            
Fair Value [59]               $ 0           0
Investment, Identifier [Axis]: NCI Inc, Class I-1 Common Stock, Software & Services                            
Principal (in shares) | shares 42,923 [9],[33],[35] 42,923 [9],[33],[35] 42,923 [9],[33],[35] 42,923 [9],[33],[35] 42,923 [9],[33],[35] 42,923 [9],[33],[35] 42,923 [9],[33],[35] 42,923 [13],[28],[36] 42,923 [13],[28],[36] 42,923 [13],[28],[36] 42,923 [13],[28],[36] 42,923 [13],[28],[36] 42,923 [13],[28],[36]  
Amortized Cost $ 0.0 [9],[33],[35]             $ 0 [13],[28],[36]            
Fair Value $ 0 [1],[9],[33],[35]             $ 0 [2],[13],[28],[36]            
Investment, Identifier [Axis]: NCI Inc, Software & Services                            
Rate, PIK 7.50% [8],[9],[35] 7.50% [8],[9],[35] 7.50% [8],[9],[35] 7.50% [8],[9],[35] 7.50% [8],[9],[35] 7.50% [8],[9],[35] 7.50% [8],[9],[35] 7.50% [10],[13],[36] 7.50% [10],[13],[36] 7.50% [10],[13],[36] 7.50% [10],[13],[36] 7.50% [10],[13],[36] 7.50% [10],[13],[36]  
Rate, Max PIK 7.50% [8],[9],[35] 7.50% [8],[9],[35] 7.50% [8],[9],[35] 7.50% [8],[9],[35] 7.50% [8],[9],[35] 7.50% [8],[9],[35] 7.50% [8],[9],[35] 7.50% [10] 7.50% [10] 7.50% [10] 7.50% [10] 7.50% [10] 7.50% [10]  
Floor 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [13],[36] 1.00% [13],[36] 1.00% [13],[36] 1.00% [13],[36] 1.00% [13],[36] 1.00% [13],[36]  
Principal Amount $ 31,100,000 [9],[15],[35]             $ 28,100,000 [13],[16],[36]            
Amortized Cost 31,200,000 [9],[35]             28,700,000 [13],[36]            
Fair Value $ 31,100,000 [1],[9],[35]             $ 28,100,000 [2],[13],[36]            
Investment, Identifier [Axis]: NPD Group Inc/The, Consumer Services 1                            
Rate, basis spread on variable rate [10],[13]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%  
Floor [13]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%  
Principal Amount [13],[16]               $ 100,000            
Amortized Cost [13]               100,000            
Fair Value [2],[13]               $ 100,000            
Investment, Identifier [Axis]: NPD Group Inc/The, Consumer Services 2                            
Rate, basis spread on variable rate [10],[13]               3.50% 3.50% 3.50% 3.50% 3.50% 3.50%  
Rate, PIK [10],[13]               2.80% 2.80% 2.80% 2.80% 2.80% 2.80%  
Rate, Max PIK [10],[13]               2.80% 2.80% 2.80% 2.80% 2.80% 2.80%  
Floor [13]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%  
Principal Amount [13],[16]               $ 19,200,000            
Amortized Cost [13]               19,200,000            
Fair Value [2],[13]               $ 19,200,000            
Investment, Identifier [Axis]: NPD Group Inc/The, Consumer Services 3                            
Rate, basis spread on variable rate [10],[19]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%  
Floor [19]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%  
Principal Amount [16],[19]               $ 900,000            
Amortized Cost [19]               900,000            
Fair Value [2],[19]               $ 900,000            
Investment, Identifier [Axis]: Net Documents, Software & Services 2                            
Rate, basis spread on variable rate [8],[9] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%              
Floor [8],[9] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [9],[15] $ 1,600,000                          
Amortized Cost [9] 1,600,000                          
Fair Value [1],[9] $ 1,600,000                          
Investment, Identifier [Axis]: Net Documents, Software & Services 1                            
Rate, basis spread on variable rate [10],[13]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%  
Rate, PIK [8],[9] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%              
Floor 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13]  
Principal Amount $ 25,600,000 [9],[15]             $ 33,000,000.0 [13],[16]            
Amortized Cost 25,500,000 [9]             32,800,000 [13]            
Fair Value $ 25,600,000 [1],[9]             $ 32,000,000.0 [2],[13]            
Investment, Identifier [Axis]: Net Documents, Software & Services 2                            
Rate, basis spread on variable rate [10],[19]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%  
Floor [19]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [16],[19]               $ 3,000,000.0            
Amortized Cost [19]               2,900,000            
Fair Value [2],[19]               $ 2,900,000            
Investment, Identifier [Axis]: Net Documents, Software & Services 3                            
Rate, basis spread on variable rate [8],[9] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%              
Floor [8],[9] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [9],[15] $ 7,400,000                          
Amortized Cost [9] 7,300,000                          
Fair Value [1],[9] $ 7,400,000                          
Investment, Identifier [Axis]: Net Documents, Software & Services 4                            
Rate, basis spread on variable rate [8],[20] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%              
Floor [8],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [15],[20] $ 1,400,000                          
Amortized Cost [20] 1,400,000                          
Fair Value [1],[20] $ 1,400,000                          
Investment, Identifier [Axis]: New Era Technology Inc, Software & Services 1                            
Rate, basis spread on variable rate 6.25% [8],[17],[18] 6.25% [8],[17],[18] 6.25% [8],[17],[18] 6.25% [8],[17],[18] 6.25% [8],[17],[18] 6.25% [8],[17],[18] 6.25% [8],[17],[18] 6.25% [10],[12],[14],[22],[42] 6.25% [10],[12],[14],[22],[42] 6.25% [10],[12],[14],[22],[42] 6.25% [10],[12],[14],[22],[42] 6.25% [10],[12],[14],[22],[42] 6.25% [10],[12],[14],[22],[42]  
Floor 1.00% [8],[17],[18] 1.00% [8],[17],[18] 1.00% [8],[17],[18] 1.00% [8],[17],[18] 1.00% [8],[17],[18] 1.00% [8],[17],[18] 1.00% [8],[17],[18] 1.00% [12],[14],[22],[42] 1.00% [12],[14],[22],[42] 1.00% [12],[14],[22],[42] 1.00% [12],[14],[22],[42] 1.00% [12],[14],[22],[42] 1.00% [12],[14],[22],[42]  
Principal Amount $ 25,300,000 [15],[17],[18]             $ 51,100,000 [12],[14],[16],[22],[42]            
Amortized Cost 24,500,000 [17],[18]             49,400,000 [12],[14],[22],[42]            
Fair Value $ 24,900,000 [1],[17],[18]             $ 50,200,000 [2],[12],[14],[22],[42]            
Investment, Identifier [Axis]: New Era Technology Inc, Software & Services 2                            
Rate, basis spread on variable rate 6.25% [8],[20] 6.25% [8],[20] 6.25% [8],[20] 6.25% [8],[20] 6.25% [8],[20] 6.25% [8],[20] 6.25% [8],[20] 6.25% [10],[13] 6.25% [10],[13] 6.25% [10],[13] 6.25% [10],[13] 6.25% [10],[13] 6.25% [10],[13]  
Floor 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13]  
Principal Amount $ 4,700,000 [15],[20]             $ 2,600,000 [13],[16]            
Amortized Cost 4,600,000 [20]             2,500,000 [13]            
Fair Value $ 4,600,000 [1],[20]             $ 2,500,000 [2],[13]            
Investment, Identifier [Axis]: New Era Technology Inc, Software & Services 3                            
Rate, basis spread on variable rate [10],[19]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%  
Floor [19]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [16],[19]               $ 2,100,000            
Amortized Cost [19]               2,100,000            
Fair Value [2],[19]               $ 2,100,000            
Investment, Identifier [Axis]: NewStar Clarendon 2014-1A Class D, Diversified Financials                            
Rate, stated interest rate [10],[13],[29]               19.30% 19.30% 19.30% 19.30% 19.30% 19.30%  
Principal Amount [13],[16],[29]               $ 8,300,000            
Amortized Cost [13],[29]               2,500,000            
Fair Value [2],[13],[29]               $ 3,500,000            
Investment, Identifier [Axis]: NewStar Clarendon 2014-1A Class D, Financial Services                            
Rate, stated interest rate [8],[9],[34] 2.10% 2.10% 2.10% 2.10% 2.10% 2.10% 2.10%              
Principal Amount [9],[15],[34] $ 8,300,000                          
Amortized Cost [9],[34] 2,500,000                          
Fair Value [1],[9],[34] $ 2,300,000                          
Investment, Identifier [Axis]: Nine West Holdings Inc, Common Stock, Consumer Durables & Apparel                            
Principal (in shares) | shares [9],[33] 5,451 5,451 5,451 5,451 5,451 5,451 5,451 5,451 5,451 5,451 5,451 5,451 5,451  
Amortized Cost [9],[33] $ 6,400,000             $ 6,400,000            
Fair Value [9],[33] $ 0 [1]             $ 0 [2]            
Investment, Identifier [Axis]: NovaTaste Austria GmbH, Food, Beverage & Tobacco 1                            
Rate, basis spread on variable rate [8],[9],[34] 7.00% 7.00% 7.00% 7.00% 7.00% 7.00% 7.00%              
Floor [8],[9],[34] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%              
Principal Amount | € [9],[15],[34]   € 14.9                        
Amortized Cost [9],[34] $ 15,500,000                          
Fair Value [1],[9],[34] $ 15,400,000                          
Investment, Identifier [Axis]: NovaTaste Austria GmbH, Food, Beverage & Tobacco 2                            
Rate, basis spread on variable rate [8],[20],[34] 7.00% 7.00% 7.00% 7.00% 7.00% 7.00% 7.00%              
Floor [8],[20],[34] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%              
Principal Amount | € [15],[20],[34]   € 4.7                        
Amortized Cost [20],[34] $ 4,900,000                          
Fair Value [1],[20],[34] $ 4,800,000                          
Investment, Identifier [Axis]: Novotech Pty Ltd, Health Care Equipment & Services                            
Rate, basis spread on variable rate [8],[20],[34] 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%              
Floor [8],[20],[34] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%              
Principal Amount [15],[20],[34] $ 5,700,000                          
Amortized Cost [20],[34] 5,600,000                          
Fair Value [1],[20],[34] $ 5,600,000                          
Investment, Identifier [Axis]: Novotech Pty Ltd, Health Care Equipment & Services                            
Rate, basis spread on variable rate [10],[19],[29]               5.25% 5.25% 5.25% 5.25% 5.25% 5.25%  
Floor [19],[29]               0.50% 0.50% 0.50% 0.50% 0.50% 0.50%  
Principal Amount [16],[19],[29]               $ 5,700,000            
Amortized Cost [19],[29]               5,600,000            
Fair Value [2],[19],[29]               $ 5,500,000            
Investment, Identifier [Axis]: OEConnection LLC, Software & Services                            
Rate, basis spread on variable rate [8],[9] 7.00% 7.00% 7.00% 7.00% 7.00% 7.00% 7.00%              
Floor [8],[9] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%              
Principal Amount [9],[15] $ 76,100,000                          
Amortized Cost [9] 75,800,000                          
Fair Value [1],[9] $ 75,100,000                          
Investment, Identifier [Axis]: OEConnection LLC, Software & Services                            
Rate, basis spread on variable rate [10],[13],[21]               7.00% 7.00% 7.00% 7.00% 7.00% 7.00%  
Floor [13],[21]               0.50% 0.50% 0.50% 0.50% 0.50% 0.50%  
Principal Amount [13],[16],[21]               $ 76,100,000            
Amortized Cost [13],[21]               75,700,000            
Fair Value [2],[13],[21]               $ 73,600,000            
Investment, Identifier [Axis]: Omnimax International Inc, Capital Goods                            
Rate, basis spread on variable rate [8],[9],[17],[18],[23],[43] 8.50% 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%              
Floor [8],[9],[17],[18],[23],[43] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [9],[15],[17],[18],[23],[43] $ 124,000,000.0                          
Amortized Cost [9],[17],[18],[23],[43] 119,700,000                          
Fair Value [1],[9],[17],[18],[23],[43] $ 121,600,000                          
Investment, Identifier [Axis]: Omnimax International Inc, Capital Goods                            
Rate, basis spread on variable rate [10],[11],[12],[13],[14],[21],[42]               8.50% 8.50% 8.50% 8.50% 8.50% 8.50%  
Floor [11],[12],[13],[14],[21],[42]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [11],[12],[13],[14],[16],[21],[42]               $ 183,600,000            
Amortized Cost [11],[12],[13],[14],[21],[42]               176,600,000            
Fair Value [2],[11],[12],[13],[14],[21],[42]               175,000,000.0            
Investment, Identifier [Axis]: One Call Care Management Inc 1                            
Fair Value [60]               0           5,000,000.0
Investment, Identifier [Axis]: One Call Care Management Inc 2                            
Fair Value [60]               0           23,500,000
Investment, Identifier [Axis]: One Call Care Management Inc, Health Care Equipment & Services                            
Rate, basis spread on variable rate [8],[9],[40] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%              
Floor [8],[9],[40] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%              
Principal Amount [9],[15],[40] $ 4,900,000                          
Amortized Cost [9],[40] 4,700,000                          
Fair Value [1],[9],[40] $ 4,000,000.0                          
Investment, Identifier [Axis]: One Call Care Management Inc, Common Stock                            
Fair Value [60]               $ 0           2,400,000
Investment, Identifier [Axis]: One Call Care Management Inc, Common Stock, Health Care Equipment & Services                            
Principal (in shares) | shares [9],[33] 34,872 34,872 34,872 34,872 34,872 34,872 34,872 34,872 34,872 34,872 34,872 34,872 34,872  
Amortized Cost [9],[33] $ 2,100,000             $ 2,100,000            
Fair Value [9],[33] $ 1,800,000 [1]             $ 1,900,000 [2]            
Investment, Identifier [Axis]: One Call Care Management Inc, Health Care Equipment & Services 1                            
Rate, basis spread on variable rate [10],[13],[41]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%  
Floor [13],[41]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%  
Principal Amount [13],[16],[41]               $ 4,900,000            
Amortized Cost [13],[41]               4,700,000            
Fair Value [2],[13],[41]               $ 4,100,000            
Investment, Identifier [Axis]: One Call Care Management Inc, Health Care Equipment & Services 2                            
Rate, PIK 8.50% [8],[9] 8.50% [8],[9] 8.50% [8],[9] 8.50% [8],[9] 8.50% [8],[9] 8.50% [8],[9] 8.50% [8],[9] 8.50% [10],[13] 8.50% [10],[13] 8.50% [10],[13] 8.50% [10],[13] 8.50% [10],[13] 8.50% [10],[13]  
Rate, Max PIK 8.50% [8],[9] 8.50% [8],[9] 8.50% [8],[9] 8.50% [8],[9] 8.50% [8],[9] 8.50% [8],[9] 8.50% [8],[9] 8.50% [10],[13] 8.50% [10],[13] 8.50% [10],[13] 8.50% [10],[13] 8.50% [10],[13] 8.50% [10],[13]  
Principal Amount $ 26,700,000 [9],[15]             $ 25,600,000 [13],[16]            
Amortized Cost 25,100,000 [9]             23,900,000 [13]            
Fair Value $ 19,600,000 [1],[9]             20,900,000 [2],[13]            
Investment, Identifier [Axis]: One Call Care Management Inc, Preferred Stock A                            
Fair Value [60]               $ 0           26,100,000
Investment, Identifier [Axis]: One Call Care Management Inc, Preferred Stock A, Health Care Equipment & Services                            
Principal (in shares) | shares [9],[33] 371,992 371,992 371,992 371,992 371,992 371,992 371,992 371,992 371,992 371,992 371,992 371,992 371,992  
Amortized Cost [9],[33] $ 22,800,000             $ 22,800,000            
Fair Value [9],[33] $ 18,200,000 [1]             20,500,000 [2]            
Investment, Identifier [Axis]: One Call Care Management Inc, Preferred Stock B 1                            
Fair Value [60]               $ 0           9,200,000
Investment, Identifier [Axis]: One Call Care Management Inc, Preferred Stock B, Health Care Equipment & Services                            
Rate, PIK 9.00% [9] 9.00% [9] 9.00% [9] 9.00% [9] 9.00% [9] 9.00% [9] 9.00% [9] 9.00% [10],[13] 9.00% [10],[13] 9.00% [10],[13] 9.00% [10],[13] 9.00% [10],[13] 9.00% [10],[13]  
Rate, Max PIK 9.00% [9] 9.00% [9] 9.00% [9] 9.00% [9] 9.00% [9] 9.00% [9] 9.00% [9] 9.00% [10],[13] 9.00% [10],[13] 9.00% [10],[13] 9.00% [10],[13] 9.00% [10],[13] 9.00% [10],[13]  
Principal (in shares) | shares 7,672,347 [9] 7,672,347 [9] 7,672,347 [9] 7,672,347 [9] 7,672,347 [9] 7,672,347 [9] 7,672,347 [9] 7,672,347 [13] 7,672,347 [13] 7,672,347 [13] 7,672,347 [13] 7,672,347 [13] 7,672,347 [13]  
Amortized Cost $ 8,000,000.0 [9]             $ 8,000,000.0 [13]            
Fair Value $ 7,700,000 [1],[9]             $ 7,700,000 [2],[13]            
Investment, Identifier [Axis]: Opendoor Labs Inc, Structured Mezzanine, Real Estate                            
Rate, stated interest rate [10],[13],[29]               10.00% 10.00% 10.00% 10.00% 10.00% 10.00%  
Principal Amount [13],[16],[29]               $ 71,100,000            
Amortized Cost [13],[29]               71,100,000            
Fair Value [2],[13],[29]               66,400,000            
Investment, Identifier [Axis]: Opendoor Labs Inc, Structured Mezzanine, Real Estate Management & Development                            
Rate, stated interest rate [8],[9],[34] 10.00% 10.00% 10.00% 10.00% 10.00% 10.00% 10.00%              
Principal Amount [9],[15],[34] $ 56,900,000                          
Amortized Cost [9],[34] 56,900,000                          
Fair Value [1],[9],[34] $ 53,400,000                          
Investment, Identifier [Axis]: Orchard Marine Limited, Class B Common Stock, Asset Based Finance                            
Fair Value               0           0
Investment, Identifier [Axis]: Orchard Marine Limited, Series A Preferred Stock, Asset Based Finance                            
Fair Value               $ 0           64,600,000
Investment, Identifier [Axis]: Oxford Global Resources LLC, Commercial & Professional Services 1                            
Rate, basis spread on variable rate [8],[9],[18],[23],[24],[43] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%              
Floor [8],[9],[18],[23],[24],[43] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [9],[15],[18],[23],[24],[43] $ 94,100,000                          
Amortized Cost [9],[18],[23],[24],[43] 93,500,000                          
Fair Value [1],[9],[18],[23],[24],[43] $ 95,000,000.0                          
Investment, Identifier [Axis]: Oxford Global Resources LLC, Commercial & Professional Services 1                            
Rate, basis spread on variable rate [10],[11],[12],[13],[21],[22],[42]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Floor [11],[12],[13],[21],[22],[42]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [11],[12],[13],[16],[21],[22],[42]               $ 94,500,000            
Amortized Cost [11],[12],[13],[21],[22],[42]               93,700,000            
Fair Value [2],[11],[12],[13],[21],[22],[42]               $ 94,100,000            
Investment, Identifier [Axis]: Oxford Global Resources LLC, Commercial & Professional Services 2                            
Rate, basis spread on variable rate 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [10],[13] 6.00% [10],[13] 6.00% [10],[13] 6.00% [10],[13] 6.00% [10],[13] 6.00% [10],[13]  
Floor 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13]  
Principal Amount $ 8,000,000.0 [15],[20]             $ 3,500,000 [13],[16]            
Amortized Cost 8,000,000.0 [20]             3,500,000 [13]            
Fair Value $ 8,100,000 [1],[20]             $ 3,500,000 [2],[13]            
Investment, Identifier [Axis]: Oxford Global Resources LLC, Commercial & Professional Services 3                            
Rate, basis spread on variable rate 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [10],[19] 6.00% [10],[19] 6.00% [10],[19] 6.00% [10],[19] 6.00% [10],[19] 6.00% [10],[19]  
Floor 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19]  
Principal Amount $ 7,600,000 [15],[20]             $ 8,300,000 [16],[19]            
Amortized Cost 7,600,000 [20]             8,300,000 [19]            
Fair Value $ 7,600,000 [1],[20]             $ 8,300,000 [2],[19]            
Investment, Identifier [Axis]: Oxford Global Resources LLC, Commercial & Professional Services 4                            
Rate, basis spread on variable rate [10],[19]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Floor [19]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [16],[19]               $ 4,100,000            
Amortized Cost [19]               4,100,000            
Fair Value [2],[19]               4,100,000            
Investment, Identifier [Axis]: PRG III LLC, Preferred Stock, Series A PIK                            
Fair Value               $ 105,700,000           17,400,000
Investment, Identifier [Axis]: PRG III LLC, Preferred Stock, Series A PIK, Media & Entertainment                            
Principal (in shares) | shares 434,250 [9],[33],[35] 434,250 [9],[33],[35] 434,250 [9],[33],[35] 434,250 [9],[33],[35] 434,250 [9],[33],[35] 434,250 [9],[33],[35] 434,250 [9],[33],[35] 434,250 [13],[28],[36] 434,250 [13],[28],[36] 434,250 [13],[28],[36] 434,250 [13],[28],[36] 434,250 [13],[28],[36] 434,250 [13],[28],[36]  
Amortized Cost $ 18,100,000 [9],[33],[35]             $ 18,100,000 [13],[28],[36]            
Fair Value $ 124,800,000 [1],[9],[33],[35]             105,700,000 [2],[13],[28],[36]            
Investment, Identifier [Axis]: PRG III LLC, Preferred Stock, Series B PIK                            
Fair Value               $ 0           0
Investment, Identifier [Axis]: PRG III LLC, Preferred Stock, Series B PIK, Media & Entertainment                            
Principal (in shares) | shares 140 [9],[33],[35] 140 [9],[33],[35] 140 [9],[33],[35] 140 [9],[33],[35] 140 [9],[33],[35] 140 [9],[33],[35] 140 [9],[33],[35] 140 [13],[28],[36] 140 [13],[28],[36] 140 [13],[28],[36] 140 [13],[28],[36] 140 [13],[28],[36] 140 [13],[28],[36]  
Amortized Cost $ 0 [9],[33],[35]             $ 0 [13],[28],[36]            
Fair Value $ 0 [1],[9],[33],[35]             $ 0 [2],[13],[28],[36]            
Investment, Identifier [Axis]: PSKW LLC (dba ConnectiveRx), Health Care Equipment & Services                            
Rate, basis spread on variable rate 6.25% [8],[9],[17],[18],[24],[37],[43] 6.25% [8],[9],[17],[18],[24],[37],[43] 6.25% [8],[9],[17],[18],[24],[37],[43] 6.25% [8],[9],[17],[18],[24],[37],[43] 6.25% [8],[9],[17],[18],[24],[37],[43] 6.25% [8],[9],[17],[18],[24],[37],[43] 6.25% [8],[9],[17],[18],[24],[37],[43] 6.25% [10],[12],[13],[14],[22],[38] 6.25% [10],[12],[13],[14],[22],[38] 6.25% [10],[12],[13],[14],[22],[38] 6.25% [10],[12],[13],[14],[22],[38] 6.25% [10],[12],[13],[14],[22],[38] 6.25% [10],[12],[13],[14],[22],[38]  
Floor 1.00% [8],[9],[17],[18],[24],[37],[43] 1.00% [8],[9],[17],[18],[24],[37],[43] 1.00% [8],[9],[17],[18],[24],[37],[43] 1.00% [8],[9],[17],[18],[24],[37],[43] 1.00% [8],[9],[17],[18],[24],[37],[43] 1.00% [8],[9],[17],[18],[24],[37],[43] 1.00% [8],[9],[17],[18],[24],[37],[43] 1.00% [12],[13],[14],[22],[38] 1.00% [12],[13],[14],[22],[38] 1.00% [12],[13],[14],[22],[38] 1.00% [12],[13],[14],[22],[38] 1.00% [12],[13],[14],[22],[38] 1.00% [12],[13],[14],[22],[38]  
Principal Amount $ 264,600,000 [9],[15],[17],[18],[24],[37],[43]             $ 291,800,000 [12],[13],[14],[16],[22],[38]            
Amortized Cost 258,400,000 [9],[17],[18],[24],[37],[43]             282,800,000 [12],[13],[14],[22],[38]            
Fair Value $ 264,600,000 [1],[9],[17],[18],[24],[37],[43]             $ 291,800,000 [2],[12],[13],[14],[22],[38]            
Investment, Identifier [Axis]: Parts Town LLC                            
Rate, basis spread on variable rate [8],[9],[43] 5.98% 5.98% 5.98% 5.98% 5.98% 5.98% 5.98%              
Floor [8],[9],[43] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%              
Principal Amount [9],[15],[43] $ 12,000,000.0                          
Amortized Cost [9],[43] 11,900,000                          
Fair Value [1],[9],[43] $ 11,800,000                          
Investment, Identifier [Axis]: Parts Town LLC, Consumer Discretionary Distribution & Retail 2                            
Rate, basis spread on variable rate [8],[9] 5.98% 5.98% 5.98% 5.98% 5.98% 5.98% 5.98%              
Floor [8],[9] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%              
Principal Amount [9],[15] $ 62,800,000                          
Amortized Cost [9] 62,300,000                          
Fair Value [1],[9] $ 62,000,000.0                          
Investment, Identifier [Axis]: Parts Town LLC, Retailing 1                            
Rate, basis spread on variable rate [10],[13],[22]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%  
Floor [13],[22]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%  
Principal Amount [13],[16],[22]               $ 37,100,000            
Amortized Cost [13],[22]               36,800,000            
Fair Value [2],[13],[22]               $ 35,900,000            
Investment, Identifier [Axis]: Parts Town LLC, Retailing 2                            
Rate, basis spread on variable rate [10],[13]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%  
Floor [13]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%  
Principal Amount [13],[16]               $ 63,200,000            
Amortized Cost [13]               62,700,000            
Fair Value [2],[13]               $ 61,100,000            
Investment, Identifier [Axis]: PartsSource Inc, Health Care Equipment & Services 1                            
Rate, basis spread on variable rate 5.75% [8],[9] 5.75% [8],[9] 5.75% [8],[9] 5.75% [8],[9] 5.75% [8],[9] 5.75% [8],[9] 5.75% [8],[9] 5.75% [10],[13] 5.75% [10],[13] 5.75% [10],[13] 5.75% [10],[13] 5.75% [10],[13] 5.75% [10],[13]  
Floor 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13]  
Principal Amount $ 700,000 [9],[15]             $ 65,100,000 [13],[16]            
Amortized Cost 600,000 [9]             64,500,000 [13]            
Fair Value $ 700,000 [1],[9]             $ 62,900,000 [2],[13]            
Investment, Identifier [Axis]: PartsSource Inc, Health Care Equipment & Services 2                            
Rate, basis spread on variable rate 5.75% [8],[9] 5.75% [8],[9] 5.75% [8],[9] 5.75% [8],[9] 5.75% [8],[9] 5.75% [8],[9] 5.75% [8],[9] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19]  
Floor 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19]  
Principal Amount $ 69,300,000 [9],[15]             $ 4,300,000 [16],[19]            
Amortized Cost 68,600,000 [9]             4,300,000 [19]            
Fair Value $ 68,600,000 [1],[9]             $ 4,100,000 [2],[19]            
Investment, Identifier [Axis]: PartsSource Inc, Health Care Equipment & Services 3                            
Rate, basis spread on variable rate 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19]  
Floor 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19]  
Principal Amount $ 3,600,000 [15],[20]             $ 22,900,000 [16],[19]            
Amortized Cost 3,600,000 [20]             22,700,000 [19]            
Fair Value $ 3,600,000 [1],[20]             $ 22,100,000 [2],[19]            
Investment, Identifier [Axis]: PartsSource Inc, Health Care Equipment & Services 4                            
Rate, basis spread on variable rate [8],[20] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%              
Floor [8],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%              
Principal Amount [15],[20] $ 18,100,000                          
Amortized Cost [20] 18,100,000                          
Fair Value [1],[20] $ 17,900,000                          
Investment, Identifier [Axis]: PayPal Europe Sarl et Cie SCA, Private Equity, Financial Services                            
Principal (in shares) | shares [9],[15],[33],[34] 1,883,473 1,883,473 1,883,473 1,883,473 1,883,473 1,883,473 1,883,473              
Amortized Cost [9],[33],[34] $ 2,100,000                          
Fair Value [1],[9],[33],[34] $ 2,000,000.0                          
Investment, Identifier [Axis]: Peraton Corp, Capital Goods 1                            
Rate, basis spread on variable rate 8.00% [8],[9],[37] 8.00% [8],[9],[37] 8.00% [8],[9],[37] 8.00% [8],[9],[37] 8.00% [8],[9],[37] 8.00% [8],[9],[37] 8.00% [8],[9],[37] 8.00% [10],[13],[38] 8.00% [10],[13],[38] 8.00% [10],[13],[38] 8.00% [10],[13],[38] 8.00% [10],[13],[38] 8.00% [10],[13],[38]  
Floor 1.00% [8],[9],[37] 1.00% [8],[9],[37] 1.00% [8],[9],[37] 1.00% [8],[9],[37] 1.00% [8],[9],[37] 1.00% [8],[9],[37] 1.00% [8],[9],[37] 1.00% [13],[38] 1.00% [13],[38] 1.00% [13],[38] 1.00% [13],[38] 1.00% [13],[38] 1.00% [13],[38]  
Principal Amount $ 175,000,000.0 [9],[15],[37]             $ 175,000,000.0 [13],[16],[38]            
Amortized Cost 166,900,000 [9],[37]             166,200,000 [13],[38]            
Fair Value $ 175,300,000 [1],[9],[37]             $ 174,700,000 [2],[13],[38]            
Investment, Identifier [Axis]: Peraton Corp, Capital Goods 2                            
Rate, basis spread on variable rate 7.75% [8],[9] 7.75% [8],[9] 7.75% [8],[9] 7.75% [8],[9] 7.75% [8],[9] 7.75% [8],[9] 7.75% [8],[9] 7.75% [10],[13] 7.75% [10],[13] 7.75% [10],[13] 7.75% [10],[13] 7.75% [10],[13] 7.75% [10],[13]  
Floor 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13]  
Principal Amount $ 129,800,000 [9],[15]             $ 130,400,000 [13],[16]            
Amortized Cost 124,600,000 [9]             124,800,000 [13]            
Fair Value $ 128,700,000 [1],[9]             $ 128,800,000 [2],[13]            
Investment, Identifier [Axis]: Performance Health Holdings Inc, Health Care Equipment & Services                            
Rate, basis spread on variable rate [8],[9],[17],[23],[43] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%              
Floor [8],[9],[17],[23],[43] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [9],[15],[17],[23],[43] $ 108,300,000                          
Amortized Cost [9],[17],[23],[43] 107,500,000                          
Fair Value [1],[9],[17],[23],[43] $ 107,600,000                          
Investment, Identifier [Axis]: Performance Health Holdings Inc, Health Care Equipment & Services                            
Rate, basis spread on variable rate [10],[13],[14],[21],[42]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Floor [13],[14],[21],[42]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [13],[14],[16],[21],[42]               $ 108,300,000            
Amortized Cost [13],[14],[21],[42]               107,400,000            
Fair Value [2],[13],[14],[21],[42]               105,400,000            
Investment, Identifier [Axis]: Petroplex Acidizing Inc, Preferred Stock A, Equity/Other                            
Fair Value               0           0
Investment, Identifier [Axis]: Petroplex Acidizing Inc, Senior Secured Loans—First Lien                            
Fair Value               $ 0           9,700,000
Investment, Identifier [Axis]: Petroplex Acidizing Inc, Trade Claim, Energy                            
Principal (in shares) | shares [9],[33] 589,656 589,656 589,656 589,656 589,656 589,656 589,656 646,309 646,309 646,309 646,309 646,309 646,309  
Amortized Cost [9],[33] $ 600,000             $ 600,000            
Fair Value [9],[33] $ 300,000 [1]             $ 600,000 [2]            
Investment, Identifier [Axis]: Polyconcept North America Inc, Class A - 1 Units, Household & Personal Products                            
Principal (in shares) | shares 30,000 [9] 30,000 [9] 30,000 [9] 30,000 [9] 30,000 [9] 30,000 [9] 30,000 [9] 30,000 [13] 30,000 [13] 30,000 [13] 30,000 [13] 30,000 [13] 30,000 [13]  
Amortized Cost $ 3,000,000.0 [9]             $ 3,000,000.0 [13]            
Fair Value $ 8,300,000 [1],[9]             $ 10,300,000 [2],[13]            
Investment, Identifier [Axis]: Pretium Partners LLC P2, Term Loan, Real Estate                            
Rate, stated interest rate [10],[13],[29]               11.00% 11.00% 11.00% 11.00% 11.00% 11.00%  
Principal Amount [13],[16],[29]               $ 33,500,000            
Amortized Cost [13],[29]               33,000,000.0            
Fair Value [2],[13],[29]               $ 32,900,000            
Investment, Identifier [Axis]: Prime ST LLC, Private Equity, Equity Real Estate Investment Trusts (REITs)                            
Principal (in shares) | shares [9],[15],[33],[34],[35] 5,612,193 5,612,193 5,612,193 5,612,193 5,612,193 5,612,193 5,612,193              
Amortized Cost [9],[33],[34],[35] $ 7,300,000                          
Fair Value [1],[9],[33],[34],[35] $ 0                          
Investment, Identifier [Axis]: Prime ST LLC, Private Equity, Real Estate                            
Principal (in shares) | shares [13],[16],[28],[29],[36]               5,666,079 5,666,079 5,666,079 5,666,079 5,666,079 5,666,079  
Amortized Cost [13],[28],[29],[36]               $ 7,400,000            
Fair Value [2],[13],[28],[29],[36]               $ 0            
Investment, Identifier [Axis]: Prime ST LLC, Structured Mezzanine, Equity Real Estate Investment Trusts (REITs)                            
Rate, PIK [8],[9],[34],[35] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%              
Rate, Max PIK [8],[9],[34],[35] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%              
Rate, stated interest rate [8],[9],[34],[35] 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%              
Principal Amount [9],[15],[34],[35] $ 55,500,000                          
Amortized Cost [9],[34],[35] 53,800,000                          
Fair Value [1],[9],[34],[35] 30,300,000                          
Investment, Identifier [Axis]: Prime ST LLC, Structured Mezzanine, Real Estate                            
Rate, PIK [10],[13],[29],[36]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Rate, Max PIK [10],[13],[29],[36]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Rate, stated interest rate [10],[13],[29],[36]               5.00% 5.00% 5.00% 5.00% 5.00% 5.00%  
Principal Amount [13],[16],[29],[36]               $ 55,500,000            
Amortized Cost [13],[29],[36]               53,700,000            
Fair Value [2],[13],[29],[36]               43,500,000            
Investment, Identifier [Axis]: Prime St LLC, Private Equity                            
Fair Value 0             0           9,100,000
Investment, Identifier [Axis]: Prime St LLC, Structured Mezzanine                            
Fair Value 30,300,000             43,500,000           52,400,000
Investment, Identifier [Axis]: Production Resource Group LLC 1                            
Fair Value 164,400,000             152,500,000           133,300,000
Investment, Identifier [Axis]: Production Resource Group LLC 2                            
Fair Value 100,000             100,000           100,000
Investment, Identifier [Axis]: Production Resource Group LLC 3                            
Fair Value 63,800,000             68,100,000           64,400,000
Investment, Identifier [Axis]: Production Resource Group LLC 4                            
Fair Value $ 34,300,000             $ 31,300,000           20,200,000
Investment, Identifier [Axis]: Production Resource Group LLC, Media & Entertainment 1                            
Rate, basis spread on variable rate 5.00% [8],[9],[35] 5.00% [8],[9],[35] 5.00% [8],[9],[35] 5.00% [8],[9],[35] 5.00% [8],[9],[35] 5.00% [8],[9],[35] 5.00% [8],[9],[35] 5.00% [10],[13],[36] 5.00% [10],[13],[36] 5.00% [10],[13],[36] 5.00% [10],[13],[36] 5.00% [10],[13],[36] 5.00% [10],[13],[36]  
Rate, PIK 3.10% [8],[9],[35] 3.10% [8],[9],[35] 3.10% [8],[9],[35] 3.10% [8],[9],[35] 3.10% [8],[9],[35] 3.10% [8],[9],[35] 3.10% [8],[9],[35] 3.10% [10],[13],[36] 3.10% [10],[13],[36] 3.10% [10],[13],[36] 3.10% [10],[13],[36] 3.10% [10],[13],[36] 3.10% [10],[13],[36]  
Rate, Max PIK 3.10% [8],[9],[35] 3.10% [8],[9],[35] 3.10% [8],[9],[35] 3.10% [8],[9],[35] 3.10% [8],[9],[35] 3.10% [8],[9],[35] 3.10% [8],[9],[35] 3.10% [10],[13],[36] 3.10% [10],[13],[36] 3.10% [10],[13],[36] 3.10% [10],[13],[36] 3.10% [10],[13],[36] 3.10% [10],[13],[36]  
Floor 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [13],[36] 1.00% [13],[36] 1.00% [13],[36] 1.00% [13],[36] 1.00% [13],[36] 1.00% [13],[36]  
Principal Amount $ 62,000,000.0 [9],[15],[35]             $ 62,700,000 [13],[16],[36]            
Amortized Cost 60,400,000 [9],[35]             59,900,000 [13],[36]            
Fair Value $ 63,800,000 [1],[9],[35]             $ 64,600,000 [2],[13],[36]            
Investment, Identifier [Axis]: Production Resource Group LLC, Media & Entertainment 2                            
Rate, basis spread on variable rate 3.00% [8],[9],[35] 3.00% [8],[9],[35] 3.00% [8],[9],[35] 3.00% [8],[9],[35] 3.00% [8],[9],[35] 3.00% [8],[9],[35] 3.00% [8],[9],[35] 3.00% [10],[13],[36] 3.00% [10],[13],[36] 3.00% [10],[13],[36] 3.00% [10],[13],[36] 3.00% [10],[13],[36] 3.00% [10],[13],[36]  
Rate, PIK 5.50% [8],[9],[35] 5.50% [8],[9],[35] 5.50% [8],[9],[35] 5.50% [8],[9],[35] 5.50% [8],[9],[35] 5.50% [8],[9],[35] 5.50% [8],[9],[35] 5.50% [10],[13],[36] 5.50% [10],[13],[36] 5.50% [10],[13],[36] 5.50% [10],[13],[36] 5.50% [10],[13],[36] 5.50% [10],[13],[36]  
Rate, Max PIK 5.50% [8],[9],[35] 5.50% [8],[9],[35] 5.50% [8],[9],[35] 5.50% [8],[9],[35] 5.50% [8],[9],[35] 5.50% [8],[9],[35] 5.50% [8],[9],[35] 5.50% [10],[13],[36] 5.50% [10],[13],[36] 5.50% [10],[13],[36] 5.50% [10],[13],[36] 5.50% [10],[13],[36] 5.50% [10],[13],[36]  
Floor 0.30% [8],[9],[35] 0.30% [8],[9],[35] 0.30% [8],[9],[35] 0.30% [8],[9],[35] 0.30% [8],[9],[35] 0.30% [8],[9],[35] 0.30% [8],[9],[35] 0.30% [13],[36] 0.30% [13],[36] 0.30% [13],[36] 0.30% [13],[36] 0.30% [13],[36] 0.30% [13],[36]  
Principal Amount $ 161,200,000 [9],[15],[35]             $ 149,600,000 [13],[16],[36]            
Amortized Cost 157,800,000 [9],[35]             143,900,000 [13],[36]            
Fair Value $ 164,400,000 [1],[9],[35]             $ 152,500,000 [2],[13],[36]            
Investment, Identifier [Axis]: Production Resource Group LLC, Media & Entertainment 3                            
Rate, PIK 5.50% [8],[9],[35] 5.50% [8],[9],[35] 5.50% [8],[9],[35] 5.50% [8],[9],[35] 5.50% [8],[9],[35] 5.50% [8],[9],[35] 5.50% [8],[9],[35] 5.50% [10],[13],[36] 5.50% [10],[13],[36] 5.50% [10],[13],[36] 5.50% [10],[13],[36] 5.50% [10],[13],[36] 5.50% [10],[13],[36]  
Rate, Max PIK 5.50% [8],[9],[35] 5.50% [8],[9],[35] 5.50% [8],[9],[35] 5.50% [8],[9],[35] 5.50% [8],[9],[35] 5.50% [8],[9],[35] 5.50% [8],[9],[35] 5.50% [10],[13],[36] 5.50% [10],[13],[36] 5.50% [10],[13],[36] 5.50% [10],[13],[36] 5.50% [10],[13],[36] 5.50% [10],[13],[36]  
Floor 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [13],[36] 1.00% [13],[36] 1.00% [13],[36] 1.00% [13],[36] 1.00% [13],[36] 1.00% [13],[36]  
Principal Amount $ 100,000 [9],[15],[35]             $ 100,000 [13],[16],[36]            
Amortized Cost 100,000 [9],[35]             100,000 [13],[36]            
Fair Value $ 100,000 [1],[9],[35]             $ 100,000 [2],[13],[36]            
Investment, Identifier [Axis]: Production Resource Group LLC, Media & Entertainment 4                            
Rate, basis spread on variable rate 5.00% [8],[9],[35] 5.00% [8],[9],[35] 5.00% [8],[9],[35] 5.00% [8],[9],[35] 5.00% [8],[9],[35] 5.00% [8],[9],[35] 5.00% [8],[9],[35] 5.00% [10],[13],[36] 5.00% [10],[13],[36] 5.00% [10],[13],[36] 5.00% [10],[13],[36] 5.00% [10],[13],[36] 5.00% [10],[13],[36]  
Rate, PIK 3.10% [8],[9],[35] 3.10% [8],[9],[35] 3.10% [8],[9],[35] 3.10% [8],[9],[35] 3.10% [8],[9],[35] 3.10% [8],[9],[35] 3.10% [8],[9],[35] 3.10% [10],[13],[36] 3.10% [10],[13],[36] 3.10% [10],[13],[36] 3.10% [10],[13],[36] 3.10% [10],[13],[36] 3.10% [10],[13],[36]  
Rate, Max PIK 3.10% [8],[9],[35] 3.10% [8],[9],[35] 3.10% [8],[9],[35] 3.10% [8],[9],[35] 3.10% [8],[9],[35] 3.10% [8],[9],[35] 3.10% [8],[9],[35] 3.10% [10],[13],[36] 3.10% [10],[13],[36] 3.10% [10],[13],[36] 3.10% [10],[13],[36] 3.10% [10],[13],[36] 3.10% [10],[13],[36]  
Floor 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [13],[36] 1.00% [13],[36] 1.00% [13],[36] 1.00% [13],[36] 1.00% [13],[36] 1.00% [13],[36]  
Principal Amount $ 34,000,000.0 [9],[15],[35]             $ 34,400,000 [13],[16],[36]            
Amortized Cost 33,900,000 [9],[35]             34,300,000 [13],[36]            
Fair Value 34,300,000 [1],[9],[35]             34,800,000 [2],[13],[36]            
Investment, Identifier [Axis]: Project Marron, Consumer Services 1                            
Fair Value               52,000,000.0            
Investment, Identifier [Axis]: Project Marron, Consumer Services 2                            
Fair Value               36,300,000            
Investment, Identifier [Axis]: Proserv Acquisition LLC, Class A Common Units                            
Fair Value 4,600,000             $ 1,100,000            
Investment, Identifier [Axis]: Proserv Acquisition LLC, Class A Common Units, Energy                            
Principal (in shares) | shares [13],[28],[29],[45]               2,635,005 2,635,005 2,635,005 2,635,005 2,635,005 2,635,005  
Amortized Cost [13],[28],[29],[45]               $ 33,500,000            
Fair Value [2],[13],[28],[29],[45]               1,100,000            
Investment, Identifier [Axis]: Proserv Acquisition LLC, Class A Common Units, Equity/Other                            
Fair Value               1,100,000           100,000
Investment, Identifier [Axis]: Proserv Acquisition LLC, Class A Preferred Units                            
Fair Value $ 9,500,000             $ 9,500,000            
Investment, Identifier [Axis]: Proserv Acquisition LLC, Class A Preferred Units, Energy                            
Principal (in shares) | shares [13],[28],[29],[45]               837,780 837,780 837,780 837,780 837,780 837,780  
Amortized Cost [13],[28],[29],[45]               $ 5,400,000            
Fair Value [2],[13],[28],[29],[45]               9,500,000            
Investment, Identifier [Axis]: Proserv Acquisition LLC, Class A Preferred Units, Energy 1                            
Principal (in shares) | shares [9],[33],[34],[44] 2,635,005 2,635,005 2,635,005 2,635,005 2,635,005 2,635,005 2,635,005              
Amortized Cost [9],[33],[34],[44] $ 33,500,000                          
Fair Value [1],[9],[33],[34],[44] $ 4,600,000                          
Investment, Identifier [Axis]: Proserv Acquisition LLC, Class A Preferred Units, Energy 2                            
Principal (in shares) | shares [9],[33],[34],[44] 837,780 837,780 837,780 837,780 837,780 837,780 837,780              
Amortized Cost [9],[33],[34],[44] $ 5,400,000                          
Fair Value [1],[9],[33],[34],[44] $ 9,500,000                          
Investment, Identifier [Axis]: Proserv Acquisition LLC, Class A Preferred Units, Equity/Other                            
Fair Value               $ 9,500,000           9,300,000
Investment, Identifier [Axis]: Pure Fishing Inc, Consumer Durables & Apparel                            
Rate, basis spread on variable rate [10],[13],[42]               8.38% 8.38% 8.38% 8.38% 8.38% 8.38%  
Floor [13],[42]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [13],[16],[42]               $ 100,000,000.0            
Amortized Cost [13],[42]               95,300,000            
Fair Value [2],[13],[42]               $ 56,100,000            
Investment, Identifier [Axis]: Pure Fishing Inc, Consumer Durables & Apparel                            
Rate, basis spread on variable rate [8],[9] 4.50% 4.50% 4.50% 4.50% 4.50% 4.50% 4.50%              
Floor [8],[9] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%              
Principal Amount [9],[15] $ 33,400,000                          
Amortized Cost [9] 33,000,000.0                          
Fair Value [1],[9] 30,100,000                          
Investment, Identifier [Axis]: Pure Fishing Inc, Consumer Durables & Apparel 1                            
Rate, basis spread on variable rate [10],[13],[41]               4.50% 4.50% 4.50% 4.50% 4.50% 4.50%  
Floor [13],[41]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%  
Principal Amount [13],[16],[41]               $ 33,700,000            
Amortized Cost [13],[41]               33,200,000            
Fair Value [2],[13],[41]               22,600,000            
Investment, Identifier [Axis]: Quoizel LLC (fka NBG Home) 1                            
Fair Value 6,300,000             0            
Investment, Identifier [Axis]: Quoizel LLC (fka NBG Home) 2                            
Fair Value 6,600,000             0            
Investment, Identifier [Axis]: Quoizel LLC (fka NBG Home), Common Stock                            
Fair Value $ 8,300,000             0            
Investment, Identifier [Axis]: Quoizel LLC (fka NBG Home), Common Stock, Consumer Durables & Apparel                            
Principal (in shares) | shares [9],[33],[35] 4,563 4,563 4,563 4,563 4,563 4,563 4,563              
Amortized Cost [9],[33],[35] $ 8,300,000                          
Fair Value [1],[9],[33],[35] $ 8,300,000                          
Investment, Identifier [Axis]: Quoizel LLC (fka NBG Home), Consumer Durables & Apparel 1                            
Rate, PIK [8],[9],[35] 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%              
Rate, Max PIK [8],[9],[35] 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%              
Floor [8],[9],[35] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [9],[15],[35] $ 6,300,000                          
Amortized Cost [9],[35] 6,300,000                          
Fair Value [1],[9],[35] $ 6,300,000                          
Investment, Identifier [Axis]: Quoizel LLC (fka NBG Home), Consumer Durables & Apparel 2                            
Rate, PIK [8],[9],[35] 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%              
Rate, Max PIK [8],[9],[35] 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%              
Floor [8],[9],[35] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [9],[15],[35] $ 6,600,000                          
Amortized Cost [9],[35] 6,600,000                          
Fair Value [1],[9],[35] 6,600,000                          
Investment, Identifier [Axis]: Quorum Health Corp, Private Equity                            
Fair Value $ 1,500,000             0            
Investment, Identifier [Axis]: Quorum Health Corp, Private Equity, Health Care Equipment & Services                            
Principal (in shares) | shares [9],[33],[35] 920,188 920,188 920,188 920,188 920,188 920,188 920,188              
Amortized Cost [9],[33],[35] $ 900,000                          
Fair Value [1],[9],[33],[35] 1,500,000                          
Investment, Identifier [Axis]: Quorum Health Corp, Trade Claim 1                            
Fair Value 1,000,000.0             0            
Investment, Identifier [Axis]: Quorum Health Corp, Trade Claim 2                            
Fair Value $ 200,000             $ 0            
Investment, Identifier [Axis]: Quorum Health Corp, Trade Claim, Health Care Equipment & Services                            
Principal (in shares) | shares [9],[33] 8,301,000 [35] 8,301,000 [35] 8,301,000 [35] 8,301,000 [35] 8,301,000 [35] 8,301,000 [35] 8,301,000 [35] 8,301,000 8,301,000 8,301,000 8,301,000 8,301,000 8,301,000  
Amortized Cost [9],[33] $ 700,000 [35]             $ 700,000            
Fair Value [9],[33] $ 1,000,000.0 [1],[35]             $ 900,000 [2]            
Investment, Identifier [Axis]: Quorum Health Corp, Trust Initial Funding Units, Health Care Equipment & Services                            
Principal (in shares) | shares [9],[33] 143,400 [35] 143,400 [35] 143,400 [35] 143,400 [35] 143,400 [35] 143,400 [35] 143,400 [35] 143,400 143,400 143,400 143,400 143,400 143,400  
Amortized Cost [9],[33] $ 200,000 [35]             $ 200,000            
Fair Value [9],[33] $ 200,000 [1],[35]             $ 200,000 [2]            
Investment, Identifier [Axis]: RSC Insurance Brokerage Inc, Insurance 1                            
Rate, basis spread on variable rate 5.50% [8],[9],[17],[18] 5.50% [8],[9],[17],[18] 5.50% [8],[9],[17],[18] 5.50% [8],[9],[17],[18] 5.50% [8],[9],[17],[18] 5.50% [8],[9],[17],[18] 5.50% [8],[9],[17],[18] 5.50% [10],[11],[12],[13],[14],[38],[42] 5.50% [10],[11],[12],[13],[14],[38],[42] 5.50% [10],[11],[12],[13],[14],[38],[42] 5.50% [10],[11],[12],[13],[14],[38],[42] 5.50% [10],[11],[12],[13],[14],[38],[42] 5.50% [10],[11],[12],[13],[14],[38],[42]  
Floor 0.80% [8],[9],[17],[18] 0.80% [8],[9],[17],[18] 0.80% [8],[9],[17],[18] 0.80% [8],[9],[17],[18] 0.80% [8],[9],[17],[18] 0.80% [8],[9],[17],[18] 0.80% [8],[9],[17],[18] 0.80% [11],[12],[13],[14],[38],[42] 0.80% [11],[12],[13],[14],[38],[42] 0.80% [11],[12],[13],[14],[38],[42] 0.80% [11],[12],[13],[14],[38],[42] 0.80% [11],[12],[13],[14],[38],[42] 0.80% [11],[12],[13],[14],[38],[42]  
Principal Amount $ 187,700,000 [9],[15],[17],[18]             $ 240,000,000.0 [11],[12],[13],[14],[16],[38],[42]            
Amortized Cost 183,700,000 [9],[17],[18]             234,300,000 [11],[12],[13],[14],[38],[42]            
Fair Value $ 182,800,000 [1],[9],[17],[18]             $ 236,000,000.0 [2],[11],[12],[13],[14],[38],[42]            
Investment, Identifier [Axis]: RSC Insurance Brokerage Inc, Insurance 2                            
Rate, basis spread on variable rate 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [10],[19] 5.50% [10],[19] 5.50% [10],[19] 5.50% [10],[19] 5.50% [10],[19] 5.50% [10],[19]  
Floor 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19]  
Principal Amount $ 7,700,000 [15],[20]             $ 7,700,000 [16],[19]            
Amortized Cost 7,600,000 [20]             7,600,000 [19]            
Fair Value $ 7,500,000 [1],[20]             $ 7,600,000 [2],[19]            
Investment, Identifier [Axis]: Radwell International LLC/PA, Capital Goods 1                            
Rate, basis spread on variable rate 6.75% [8],[9] 6.75% [8],[9] 6.75% [8],[9] 6.75% [8],[9] 6.75% [8],[9] 6.75% [8],[9] 6.75% [8],[9] 6.53% [10],[13] 6.53% [10],[13] 6.53% [10],[13] 6.53% [10],[13] 6.53% [10],[13] 6.53% [10],[13]  
Floor 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13]  
Principal Amount $ 1,400,000 [9],[15]             $ 1,000,000.0 [13],[16]            
Amortized Cost 1,400,000 [9]             1,000,000.0 [13]            
Fair Value $ 1,400,000 [1],[9]             $ 1,000,000.0 [2],[13]            
Investment, Identifier [Axis]: Radwell International LLC/PA, Capital Goods 2                            
Rate, basis spread on variable rate 6.53% [8],[43] 6.53% [8],[43] 6.53% [8],[43] 6.53% [8],[43] 6.53% [8],[43] 6.53% [8],[43] 6.53% [8],[43] 6.75% [10],[11],[12],[14],[22] 6.75% [10],[11],[12],[14],[22] 6.75% [10],[11],[12],[14],[22] 6.75% [10],[11],[12],[14],[22] 6.75% [10],[11],[12],[14],[22] 6.75% [10],[11],[12],[14],[22]  
Floor 0.80% [8],[43] 0.80% [8],[43] 0.80% [8],[43] 0.80% [8],[43] 0.80% [8],[43] 0.80% [8],[43] 0.80% [8],[43] 0.80% [11],[12],[14],[22] 0.80% [11],[12],[14],[22] 0.80% [11],[12],[14],[22] 0.80% [11],[12],[14],[22] 0.80% [11],[12],[14],[22] 0.80% [11],[12],[14],[22]  
Principal Amount $ 1,000,000.0 [15],[43]             $ 92,100,000 [11],[12],[14],[16],[22]            
Amortized Cost 1,000,000.0 [43]             92,100,000 [11],[12],[14],[22]            
Fair Value $ 1,000,000.0 [1],[43]             $ 92,100,000 [2],[11],[12],[14],[22]            
Investment, Identifier [Axis]: Radwell International LLC/PA, Capital Goods 3                            
Rate, basis spread on variable rate 6.75% [8],[17],[18] 6.75% [8],[17],[18] 6.75% [8],[17],[18] 6.75% [8],[17],[18] 6.75% [8],[17],[18] 6.75% [8],[17],[18] 6.75% [8],[17],[18] 6.75% [10],[19] 6.75% [10],[19] 6.75% [10],[19] 6.75% [10],[19] 6.75% [10],[19] 6.75% [10],[19]  
Floor 0.80% [8],[17],[18] 0.80% [8],[17],[18] 0.80% [8],[17],[18] 0.80% [8],[17],[18] 0.80% [8],[17],[18] 0.80% [8],[17],[18] 0.80% [8],[17],[18] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19]  
Principal Amount $ 66,600,000 [15],[17],[18]             $ 6,900,000 [16],[19]            
Amortized Cost 66,600,000 [17],[18]             6,900,000 [19]            
Fair Value $ 67,900,000 [1],[17],[18]             $ 6,900,000 [2],[19]            
Investment, Identifier [Axis]: Radwell International LLC/PA, Capital Goods 4                            
Rate, basis spread on variable rate [8],[20] 6.75% 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%              
Floor [8],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%              
Principal Amount [15],[20] $ 5,500,000                          
Amortized Cost [20] 5,500,000                          
Fair Value [1],[20] $ 5,500,000                          
Investment, Identifier [Axis]: Reliant Rehab Hospital Cincinnati LLC, Health Care Equipment & Services                            
Rate, basis spread on variable rate 6.25% [8],[9],[17],[18],[37] 6.25% [8],[9],[17],[18],[37] 6.25% [8],[9],[17],[18],[37] 6.25% [8],[9],[17],[18],[37] 6.25% [8],[9],[17],[18],[37] 6.25% [8],[9],[17],[18],[37] 6.25% [8],[9],[17],[18],[37] 6.25% [10],[12],[13],[14],[21],[38],[42] 6.25% [10],[12],[13],[14],[21],[38],[42] 6.25% [10],[12],[13],[14],[21],[38],[42] 6.25% [10],[12],[13],[14],[21],[38],[42] 6.25% [10],[12],[13],[14],[21],[38],[42] 6.25% [10],[12],[13],[14],[21],[38],[42]  
Floor 0.00% [8],[9],[17],[18],[37] 0.00% [8],[9],[17],[18],[37] 0.00% [8],[9],[17],[18],[37] 0.00% [8],[9],[17],[18],[37] 0.00% [8],[9],[17],[18],[37] 0.00% [8],[9],[17],[18],[37] 0.00% [8],[9],[17],[18],[37] 0.00% [12],[13],[14],[21],[38],[42] 0.00% [12],[13],[14],[21],[38],[42] 0.00% [12],[13],[14],[21],[38],[42] 0.00% [12],[13],[14],[21],[38],[42] 0.00% [12],[13],[14],[21],[38],[42] 0.00% [12],[13],[14],[21],[38],[42]  
Principal Amount $ 89,000,000.0 [9],[15],[17],[18],[37]             $ 106,100,000 [12],[13],[14],[16],[21],[38],[42]            
Amortized Cost 85,600,000 [9],[17],[18],[37]             101,100,000 [12],[13],[14],[21],[38],[42]            
Fair Value $ 50,500,000 [1],[9],[17],[18],[37]             $ 84,200,000 [2],[12],[13],[14],[21],[38],[42]            
Investment, Identifier [Axis]: Revere Superior Holdings Inc, Software & Services 1                            
Rate, basis spread on variable rate 5.75% [8],[9],[43] 5.75% [8],[9],[43] 5.75% [8],[9],[43] 5.75% [8],[9],[43] 5.75% [8],[9],[43] 5.75% [8],[9],[43] 5.75% [8],[9],[43] 5.75% [10],[13],[42] 5.75% [10],[13],[42] 5.75% [10],[13],[42] 5.75% [10],[13],[42] 5.75% [10],[13],[42] 5.75% [10],[13],[42]  
Floor 1.00% [8],[9],[43] 1.00% [8],[9],[43] 1.00% [8],[9],[43] 1.00% [8],[9],[43] 1.00% [8],[9],[43] 1.00% [8],[9],[43] 1.00% [8],[9],[43] 1.00% [13],[42] 1.00% [13],[42] 1.00% [13],[42] 1.00% [13],[42] 1.00% [13],[42] 1.00% [13],[42]  
Principal Amount $ 33,200,000 [9],[15],[43]             $ 33,500,000 [13],[16],[42]            
Amortized Cost 32,700,000 [9],[43]             32,900,000 [13],[42]            
Fair Value $ 33,000,000.0 [1],[9],[43]             $ 33,500,000 [2],[13],[42]            
Investment, Identifier [Axis]: Revere Superior Holdings Inc, Software & Services 2                            
Rate, basis spread on variable rate 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [10],[13] 5.75% [10],[13] 5.75% [10],[13] 5.75% [10],[13] 5.75% [10],[13] 5.75% [10],[13]  
Floor 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13]  
Principal Amount $ 3,200,000 [15],[20]             $ 1,500,000 [13],[16]            
Amortized Cost 3,200,000 [20]             1,500,000 [13]            
Fair Value $ 3,200,000 [1],[20]             $ 1,500,000 [2],[13]            
Investment, Identifier [Axis]: Revere Superior Holdings Inc, Software & Services 3                            
Rate, basis spread on variable rate [10],[19]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%  
Floor [19]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [16],[19]               $ 1,700,000            
Amortized Cost [19]               1,700,000            
Fair Value [2],[19]               $ 1,700,000            
Investment, Identifier [Axis]: Ridgeback Resources Inc, Common Stock, Energy                            
Principal (in shares) | shares [13],[29],[54],[58]               1,969,418 1,969,418 1,969,418 1,969,418 1,969,418 1,969,418  
Amortized Cost [13],[29],[54],[58]               $ 6,400,000            
Fair Value [2],[13],[29],[54],[58]               $ 8,600,000            
Investment, Identifier [Axis]: Rise Baking Company, Food, Beverage & Tobacco 1                            
Rate, basis spread on variable rate 6.25% [8],[9],[18],[43] 6.25% [8],[9],[18],[43] 6.25% [8],[9],[18],[43] 6.25% [8],[9],[18],[43] 6.25% [8],[9],[18],[43] 6.25% [8],[9],[18],[43] 6.25% [8],[9],[18],[43] 6.50% [10],[13] 6.50% [10],[13] 6.50% [10],[13] 6.50% [10],[13] 6.50% [10],[13] 6.50% [10],[13]  
Floor 1.00% [8],[9],[18],[43] 1.00% [8],[9],[18],[43] 1.00% [8],[9],[18],[43] 1.00% [8],[9],[18],[43] 1.00% [8],[9],[18],[43] 1.00% [8],[9],[18],[43] 1.00% [8],[9],[18],[43] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13]  
Principal Amount $ 28,300,000 [9],[15],[18],[43]             $ 1,400,000 [13],[16]            
Amortized Cost 27,800,000 [9],[18],[43]             1,300,000 [13]            
Fair Value $ 28,300,000 [1],[9],[18],[43]             $ 1,300,000 [2],[13]            
Investment, Identifier [Axis]: Rise Baking Company, Food, Beverage & Tobacco 2                            
Rate, basis spread on variable rate 6.25% [8],[20] 6.25% [8],[20] 6.25% [8],[20] 6.25% [8],[20] 6.25% [8],[20] 6.25% [8],[20] 6.25% [8],[20] 6.50% [10],[12],[42] 6.50% [10],[12],[42] 6.50% [10],[12],[42] 6.50% [10],[12],[42] 6.50% [10],[12],[42] 6.50% [10],[12],[42]  
Floor 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [12],[42] 1.00% [12],[42] 1.00% [12],[42] 1.00% [12],[42] 1.00% [12],[42] 1.00% [12],[42]  
Principal Amount $ 5,300,000 [15],[20]             $ 28,500,000 [12],[16],[42]            
Amortized Cost 5,200,000 [20]             28,000,000.0 [12],[42]            
Fair Value $ 5,300,000 [1],[20]             $ 27,400,000 [2],[12],[42]            
Investment, Identifier [Axis]: Rise Baking Company, Food, Beverage & Tobacco 3                            
Rate, basis spread on variable rate [10],[19]               6.50% 6.50% 6.50% 6.50% 6.50% 6.50%  
Floor [19]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [16],[19]               $ 3,900,000            
Amortized Cost [19]               3,900,000            
Fair Value [2],[19]               3,700,000            
Investment, Identifier [Axis]: Roemanu LLC (FKA Toorak Capital Partners LLC), Private Equity                            
Fair Value               $ 261,200,000           199,300,000
Investment, Identifier [Axis]: Roemanu LLC (FKA Toorak Capital Partners LLC), Private Equity, Financial Services                            
Principal (in shares) | shares [9],[15],[35] 220,778,388 220,778,388 220,778,388 220,778,388 220,778,388 220,778,388 220,778,388              
Amortized Cost [9],[35] $ 236,500,000                          
Fair Value [1],[9],[35] $ 247,300,000                          
Investment, Identifier [Axis]: Roemanu LLC (FKA Toorak Capital Partners LLC), Private Equity, Real Estate                            
Principal (in shares) | shares [13],[16],[36]               220,778,388 220,778,388 220,778,388 220,778,388 220,778,388 220,778,388  
Amortized Cost [13],[36]               $ 236,400,000            
Fair Value [2],[13],[36]               261,200,000            
Investment, Identifier [Axis]: Roemanu LLC (FKA Toorak Capital Partners LLC), Structured Mezzanine                            
Fair Value               $ 0           22,000,000.0
Investment, Identifier [Axis]: SAMBA Safety Inc, Software & Services 1                            
Rate, basis spread on variable rate 5.25% [8],[43] 5.25% [8],[43] 5.25% [8],[43] 5.25% [8],[43] 5.25% [8],[43] 5.25% [8],[43] 5.25% [8],[43] 5.25% [10],[42] 5.25% [10],[42] 5.25% [10],[42] 5.25% [10],[42] 5.25% [10],[42] 5.25% [10],[42]  
Floor 1.00% [8],[43] 1.00% [8],[43] 1.00% [8],[43] 1.00% [8],[43] 1.00% [8],[43] 1.00% [8],[43] 1.00% [8],[43] 1.00% [42] 1.00% [42] 1.00% [42] 1.00% [42] 1.00% [42] 1.00% [42]  
Principal Amount $ 6,000,000.0 [15],[43]             $ 6,100,000 [16],[42]            
Amortized Cost 6,000,000.0 [43]             6,000,000.0 [42]            
Fair Value $ 6,000,000.0 [1],[43]             $ 6,000,000.0 [2],[42]            
Investment, Identifier [Axis]: SAMBA Safety Inc, Software & Services 2                            
Rate, basis spread on variable rate 5.25% [8],[9] 5.25% [8],[9] 5.25% [8],[9] 5.25% [8],[9] 5.25% [8],[9] 5.25% [8],[9] 5.25% [8],[9] 5.25% [10],[19] 5.25% [10],[19] 5.25% [10],[19] 5.25% [10],[19] 5.25% [10],[19] 5.25% [10],[19]  
Floor 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19]  
Principal Amount $ 1,200,000 [9],[15]             $ 2,400,000 [16],[19]            
Amortized Cost 1,200,000 [9]             2,400,000 [19]            
Fair Value $ 1,200,000 [1],[9]             $ 2,400,000 [2],[19]            
Investment, Identifier [Axis]: SAMBA Safety Inc, Software & Services 3                            
Rate, basis spread on variable rate [8],[20] 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%              
Floor [8],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [15],[20] $ 1,200,000                          
Amortized Cost [20] 1,200,000                          
Fair Value [1],[20] $ 1,200,000                          
Investment, Identifier [Axis]: Safe-Guard Products International LLC, Diversified Financials                            
Rate, basis spread on variable rate [10],[21]               5.00% 5.00% 5.00% 5.00% 5.00% 5.00%  
Floor [21]               0.50% 0.50% 0.50% 0.50% 0.50% 0.50%  
Principal Amount [16],[21]               $ 100,000            
Amortized Cost [21]               100,000            
Fair Value [2],[21]               $ 100,000            
Investment, Identifier [Axis]: Safe-Guard Products International LLC, Financial Services                            
Rate, basis spread on variable rate [8],[23] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%              
Floor [8],[23] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%              
Principal Amount [15],[23] $ 100,000                          
Amortized Cost [23] 100,000                          
Fair Value [1],[23] $ 100,000                          
Investment, Identifier [Axis]: Saluda Grade Alternative Mortgage Trust 2022-BC2, Structured Mezzanine, Real Estate 1                            
Rate, stated interest rate [10],[13],[29]               8.00% 8.00% 8.00% 8.00% 8.00% 8.00%  
Principal Amount [13],[16],[29]               $ 5,700,000            
Amortized Cost [13],[29]               5,700,000            
Fair Value [2],[13],[29]               $ 5,700,000            
Investment, Identifier [Axis]: Saluda Grade Alternative Mortgage Trust 2022-BC2, Structured Mezzanine, Real Estate 2                            
Rate, stated interest rate [10],[13],[29]               18.00% 18.00% 18.00% 18.00% 18.00% 18.00%  
Principal Amount [13],[16],[29]               $ 3,400,000            
Amortized Cost [13],[29]               2,300,000            
Fair Value [2],[13],[29]               $ 2,400,000            
Investment, Identifier [Axis]: Saluda Grade Alternative Mortgage Trust 2022-BC2, Structured Mezzanine, Real Estate Management & Development                            
Rate, stated interest rate [8],[9],[34] 18.00% 18.00% 18.00% 18.00% 18.00% 18.00% 18.00%              
Principal Amount [9],[15],[34] $ 3,400,000                          
Amortized Cost [9],[34] 2,300,000                          
Fair Value [1],[9],[34] $ 2,500,000                          
Investment, Identifier [Axis]: Saluda Grade Alternative Mortgage Trust 2022-BC2, Term Loan, Real Estate                            
Rate, stated interest rate [10],[13],[29]               7.30% 7.30% 7.30% 7.30% 7.30% 7.30%  
Principal Amount [13],[16],[29]               $ 10,500,000            
Amortized Cost [13],[29]               10,500,000            
Fair Value [2],[13],[29]               $ 10,300,000            
Investment, Identifier [Axis]: Saturn Oil & Gas Inc, Common Stock, Energy                            
Principal (in shares) | shares [9],[33],[34],[40],[53],[55] 355,993 355,993 355,993 355,993 355,993 355,993 355,993              
Amortized Cost [9],[33],[34],[40],[53],[55] $ 700,000                          
Fair Value [1],[9],[33],[34],[40],[53],[55] $ 800,000                          
Investment, Identifier [Axis]: SavATree LLC, Consumer Services 1                            
Rate, basis spread on variable rate 5.25% [8],[9] 5.25% [8],[9] 5.25% [8],[9] 5.25% [8],[9] 5.25% [8],[9] 5.25% [8],[9] 5.25% [8],[9] 5.25% [10],[13] 5.25% [10],[13] 5.25% [10],[13] 5.25% [10],[13] 5.25% [10],[13] 5.25% [10],[13]  
Floor 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13]  
Principal Amount $ 8,200,000 [9],[15]             $ 5,500,000 [13],[16]            
Amortized Cost 8,100,000 [9]             5,500,000 [13]            
Fair Value $ 8,100,000 [1],[9]             $ 5,400,000 [2],[13]            
Investment, Identifier [Axis]: SavATree LLC, Consumer Services 2                            
Rate, basis spread on variable rate 5.25% [8],[9] 5.25% [8],[9] 5.25% [8],[9] 5.25% [8],[9] 5.25% [8],[9] 5.25% [8],[9] 5.25% [8],[9] 5.25% [10],[19] 5.25% [10],[19] 5.25% [10],[19] 5.25% [10],[19] 5.25% [10],[19] 5.25% [10],[19]  
Floor 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19]  
Principal Amount $ 300,000 [9],[15]             $ 4,000,000.0 [16],[19]            
Amortized Cost 300,000 [9]             4,000,000.0 [19]            
Fair Value $ 300,000 [1],[9]             $ 3,900,000 [2],[19]            
Investment, Identifier [Axis]: SavATree LLC, Consumer Services 3                            
Rate, basis spread on variable rate 5.25% [8],[20] 5.25% [8],[20] 5.25% [8],[20] 5.25% [8],[20] 5.25% [8],[20] 5.25% [8],[20] 5.25% [8],[20] 5.25% [10],[19] 5.25% [10],[19] 5.25% [10],[19] 5.25% [10],[19] 5.25% [10],[19] 5.25% [10],[19]  
Floor 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19]  
Principal Amount $ 1,300,000 [15],[20]             $ 6,300,000 [16],[19]            
Amortized Cost 1,300,000 [20]             6,300,000 [19]            
Fair Value $ 1,300,000 [1],[20]             $ 6,200,000 [2],[19]            
Investment, Identifier [Axis]: SavATree LLC, Consumer Services 4                            
Rate, basis spread on variable rate [8],[20] 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%              
Floor [8],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%              
Principal Amount [15],[20] $ 6,000,000.0                          
Amortized Cost [20] 6,000,000.0                          
Fair Value [1],[20] $ 6,000,000.0                          
Investment, Identifier [Axis]: Sequel Youth & Family Services LLC, Class R Common Stock, Health Care Equipment & Services                            
Principal (in shares) | shares [28],[52]               900,000 900,000 900,000 900,000 900,000 900,000  
Amortized Cost [28],[52]               $ 0            
Fair Value [2],[28],[52]               $ 0            
Investment, Identifier [Axis]: Sequel Youth & Family Services LLC, Health Care Equipment & Services                            
Rate, stated interest rate 3.00% [8],[9],[30],[33] 3.00% [8],[9],[30],[33] 3.00% [8],[9],[30],[33] 3.00% [8],[9],[30],[33] 3.00% [8],[9],[30],[33] 3.00% [8],[9],[30],[33] 3.00% [8],[9],[30],[33] 3.00% [10],[13],[25],[28] 3.00% [10],[13],[25],[28] 3.00% [10],[13],[25],[28] 3.00% [10],[13],[25],[28] 3.00% [10],[13],[25],[28] 3.00% [10],[13],[25],[28]  
Principal Amount $ 57,200,000 [9],[15],[30],[33]             $ 57,200,000 [13],[16],[25],[28]            
Amortized Cost 8,900,000 [9],[30],[33]             8,900,000 [13],[25],[28]            
Fair Value $ 300,000 [1],[9],[30],[33]             $ 300,000 [2],[13],[25],[28]            
Investment, Identifier [Axis]: SitusAMC Holdings Corp, Real Estate                            
Rate, basis spread on variable rate [10],[11],[12],[22]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%  
Floor [11],[12],[22]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%  
Principal Amount [11],[12],[16],[22]               $ 55,200,000            
Amortized Cost [11],[12],[22]               54,700,000            
Fair Value [2],[11],[12],[22]               $ 53,200,000            
Investment, Identifier [Axis]: SitusAMC Holdings Corp, Real Estate Management & Development                            
Rate, basis spread on variable rate [8],[18] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%              
Floor [8],[18] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [15],[18] $ 28,100,000                          
Amortized Cost [18] 27,900,000                          
Fair Value [1],[18] $ 28,000,000.0                          
Investment, Identifier [Axis]: Solera LLC, Software & Services                            
Rate, basis spread on variable rate 9.25% [8],[9] 9.25% [8],[9] 9.25% [8],[9] 9.25% [8],[9] 9.25% [8],[9] 9.25% [8],[9] 9.25% [8],[9] 8.00% [10],[13],[41] 8.00% [10],[13],[41] 8.00% [10],[13],[41] 8.00% [10],[13],[41] 8.00% [10],[13],[41] 8.00% [10],[13],[41]  
Floor 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [13],[41] 1.00% [13],[41] 1.00% [13],[41] 1.00% [13],[41] 1.00% [13],[41] 1.00% [13],[41]  
Principal Amount $ 335,900,000 [9],[15]             $ 312,400,000 [13],[16],[41]            
Amortized Cost 321,800,000 [9]             297,300,000 [13],[41]            
Fair Value $ 335,900,000 [1],[9]             $ 307,700,000 [2],[13],[41]            
Investment, Identifier [Axis]: Solina France SASU, Food, Beverage & Tobacco                            
Rate, basis spread on variable rate 6.50% [8],[9],[34],[43] 6.50% [8],[9],[34],[43] 6.50% [8],[9],[34],[43] 6.50% [8],[9],[34],[43] 6.50% [8],[9],[34],[43] 6.50% [8],[9],[34],[43] 6.50% [8],[9],[34],[43] 6.50% [10],[13],[29],[42] 6.50% [10],[13],[29],[42] 6.50% [10],[13],[29],[42] 6.50% [10],[13],[29],[42] 6.50% [10],[13],[29],[42] 6.50% [10],[13],[29],[42]  
Floor 0.00% [8],[9],[34],[43] 0.00% [8],[9],[34],[43] 0.00% [8],[9],[34],[43] 0.00% [8],[9],[34],[43] 0.00% [8],[9],[34],[43] 0.00% [8],[9],[34],[43] 0.00% [8],[9],[34],[43] 0.00% [13],[29],[42] 0.00% [13],[29],[42] 0.00% [13],[29],[42] 0.00% [13],[29],[42] 0.00% [13],[29],[42] 0.00% [13],[29],[42]  
Principal Amount $ 19,500,000 [9],[15],[34],[43]             $ 40,000,000.0 [13],[16],[29],[42]            
Amortized Cost 19,000,000.0 [9],[34],[43]             38,800,000 [13],[29],[42]            
Fair Value $ 19,700,000 [1],[9],[34],[43]             39,100,000 [2],[13],[29],[42]            
Investment, Identifier [Axis]: Sorenson Communications LLC, Common Stock, Equity/Other                            
Fair Value [7]               $ 0           67,500,000
Investment, Identifier [Axis]: Sorenson Communications LLC, Common Stock, Telecommunication Services                            
Principal (in shares) | shares 42,731 [9],[53],[55] 42,731 [9],[53],[55] 42,731 [9],[53],[55] 42,731 [9],[53],[55] 42,731 [9],[53],[55] 42,731 [9],[53],[55] 42,731 [9],[53],[55] 42,731 [13],[28],[54],[58] 42,731 [13],[28],[54],[58] 42,731 [13],[28],[54],[58] 42,731 [13],[28],[54],[58] 42,731 [13],[28],[54],[58] 42,731 [13],[28],[54],[58]  
Amortized Cost $ 7,100,000 [9],[53],[55]             $ 7,100,000 [13],[28],[54],[58]            
Fair Value $ 0 [1],[9],[53],[55]             0 [2],[13],[28],[54],[58]            
Investment, Identifier [Axis]: Sorenson Communications LLC, Senior Secured Loans—First Lien                            
Fair Value [7]               $ 0           60,100,000
Investment, Identifier [Axis]: Sorenson Communications LLC, Telecommunication Services                            
Rate, basis spread on variable rate [8],[18],[23],[24],[40] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%              
Floor [8],[18],[23],[24],[40] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%              
Principal Amount [15],[18],[23],[24],[40] $ 30,600,000                          
Amortized Cost [18],[23],[24],[40] 29,300,000                          
Fair Value [1],[18],[23],[24],[40] 29,300,000                          
Investment, Identifier [Axis]: Sorenson Communications LLC, Telecommunication Services 1                            
Rate, basis spread on variable rate [10],[11],[21],[22],[41]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%  
Floor [11],[21],[22],[41]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%  
Principal Amount 10,400,000 [9],[15],[33],[53],[55]             $ 33,600,000 [11],[16],[21],[22],[41]            
Amortized Cost 8,900,000 [9],[33],[53],[55]             31,900,000 [11],[21],[22],[41]            
Fair Value 9,700,000 [1],[9],[33],[53],[55]             32,200,000 [2],[11],[21],[22],[41]            
Investment, Identifier [Axis]: Sorenson Communications LLC, Telecommunication Services 2                            
Principal Amount 41,900,000 [9],[15],[33],[53],[55]             9,900,000 [13],[16],[28],[54],[58]            
Amortized Cost 32,000,000.0 [9],[33],[53],[55]             8,900,000 [13],[28],[54],[58]            
Fair Value $ 35,200,000 [1],[9],[33],[53],[55]             9,300,000 [2],[13],[28],[54],[58]            
Investment, Identifier [Axis]: Sorenson Communications LLC, Telecommunication Services 3                            
Principal Amount [13],[16],[28],[54],[58]               40,300,000            
Amortized Cost [13],[28],[54],[58]               32,000,000.0            
Fair Value [2],[13],[28],[54],[58]               34,100,000            
Investment, Identifier [Axis]: Sound United LLC, Common Stock                            
Fair Value               $ 0           77,500,000
Investment, Identifier [Axis]: Sound United LLC, Common Stock, Consumer Durables & Apparel                            
Principal (in shares) | shares [13],[28]               532,768 532,768 532,768 532,768 532,768 532,768  
Amortized Cost [13],[28]               $ 700,000            
Fair Value [2],[13],[28]               $ 7,000,000.0            
Investment, Identifier [Axis]: Source Code LLC, Software & Services 1                            
Rate, basis spread on variable rate 6.50% [8],[9],[18],[24] 6.50% [8],[9],[18],[24] 6.50% [8],[9],[18],[24] 6.50% [8],[9],[18],[24] 6.50% [8],[9],[18],[24] 6.50% [8],[9],[18],[24] 6.50% [8],[9],[18],[24] 6.50% [10],[11],[12],[22] 6.50% [10],[11],[12],[22] 6.50% [10],[11],[12],[22] 6.50% [10],[11],[12],[22] 6.50% [10],[11],[12],[22] 6.50% [10],[11],[12],[22]  
Floor 1.00% [8],[9],[18],[24] 1.00% [8],[9],[18],[24] 1.00% [8],[9],[18],[24] 1.00% [8],[9],[18],[24] 1.00% [8],[9],[18],[24] 1.00% [8],[9],[18],[24] 1.00% [8],[9],[18],[24] 1.00% [11],[12],[22] 1.00% [11],[12],[22] 1.00% [11],[12],[22] 1.00% [11],[12],[22] 1.00% [11],[12],[22] 1.00% [11],[12],[22]  
Principal Amount $ 66,700,000 [9],[15],[18],[24]             $ 52,800,000 [11],[12],[16],[22]            
Amortized Cost 65,700,000 [9],[18],[24]             51,900,000 [11],[12],[22]            
Fair Value $ 66,400,000 [1],[9],[18],[24]             $ 51,300,000 [2],[11],[12],[22]            
Investment, Identifier [Axis]: Source Code LLC, Software & Services 2                            
Rate, basis spread on variable rate [10],[19]               6.50% 6.50% 6.50% 6.50% 6.50% 6.50%  
Floor [19]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [16],[19]               $ 15,300,000            
Amortized Cost [19]               15,000,000.0            
Fair Value [2],[19]               $ 14,800,000            
Investment, Identifier [Axis]: Spins LLC, Software & Services 1                            
Rate, basis spread on variable rate 5.50% [8],[9],[24],[37],[43] 5.50% [8],[9],[24],[37],[43] 5.50% [8],[9],[24],[37],[43] 5.50% [8],[9],[24],[37],[43] 5.50% [8],[9],[24],[37],[43] 5.50% [8],[9],[24],[37],[43] 5.50% [8],[9],[24],[37],[43] 5.50% [10],[13],[22],[38],[42] 5.50% [10],[13],[22],[38],[42] 5.50% [10],[13],[22],[38],[42] 5.50% [10],[13],[22],[38],[42] 5.50% [10],[13],[22],[38],[42] 5.50% [10],[13],[22],[38],[42]  
Floor 1.00% [8],[9],[24],[37],[43] 1.00% [8],[9],[24],[37],[43] 1.00% [8],[9],[24],[37],[43] 1.00% [8],[9],[24],[37],[43] 1.00% [8],[9],[24],[37],[43] 1.00% [8],[9],[24],[37],[43] 1.00% [8],[9],[24],[37],[43] 1.00% [13],[22],[38],[42] 1.00% [13],[22],[38],[42] 1.00% [13],[22],[38],[42] 1.00% [13],[22],[38],[42] 1.00% [13],[22],[38],[42] 1.00% [13],[22],[38],[42]  
Principal Amount $ 67,700,000 [9],[15],[24],[37],[43]             $ 68,200,000 [13],[16],[22],[38],[42]            
Amortized Cost 65,300,000 [9],[24],[37],[43]             65,400,000 [13],[22],[38],[42]            
Fair Value $ 67,700,000 [1],[9],[24],[37],[43]             $ 68,200,000 [2],[13],[22],[38],[42]            
Investment, Identifier [Axis]: Spins LLC, Software & Services 2                            
Rate, basis spread on variable rate 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [10],[19] 5.50% [10],[19] 5.50% [10],[19] 5.50% [10],[19] 5.50% [10],[19] 5.50% [10],[19]  
Floor 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19]  
Principal Amount $ 16,500,000 [15],[20]             $ 16,500,000 [16],[19]            
Amortized Cost 16,500,000 [20]             16,500,000 [19]            
Fair Value $ 16,500,000 [1],[20]             $ 16,500,000 [2],[19]            
Investment, Identifier [Axis]: Spins LLC, Software & Services 3                            
Rate, basis spread on variable rate 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [8],[20] 5.50% [10],[19] 5.50% [10],[19] 5.50% [10],[19] 5.50% [10],[19] 5.50% [10],[19] 5.50% [10],[19]  
Floor 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19]  
Principal Amount $ 7,900,000 [15],[20]             $ 7,900,000 [16],[19]            
Amortized Cost 7,900,000 [20]             7,900,000 [19]            
Fair Value $ 7,900,000 [1],[20]             $ 7,900,000 [2],[19]            
Investment, Identifier [Axis]: Spotless Brands LLC, Consumer Services 1                            
Rate, basis spread on variable rate [8],[9] 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%              
Floor [8],[9] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [9],[15] $ 12,400,000                          
Amortized Cost [9] 12,200,000                          
Fair Value [1],[9] $ 12,400,000                          
Investment, Identifier [Axis]: Spotless Brands LLC, Consumer Services 2                            
Rate, basis spread on variable rate [8],[20] 6.75% 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%              
Floor [8],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [15],[20] $ 18,700,000                          
Amortized Cost [20] 18,400,000                          
Fair Value [1],[20] $ 18,800,000                          
Investment, Identifier [Axis]: Staples Canada, Retailing                            
Rate, basis spread on variable rate [10],[13],[29]               7.00% 7.00% 7.00% 7.00% 7.00% 7.00%  
Floor [13],[29]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [13],[16],[29]               $ 30,500,000            
Amortized Cost [13],[29]               23,900,000            
Fair Value [2],[13],[29]               $ 22,900,000            
Investment, Identifier [Axis]: Star Mountain Diversified Credit Income Fund III, LP, Private Equity, Diversified Financials                            
Principal (in shares) | shares [16],[29],[57]               23,500,000 23,500,000 23,500,000 23,500,000 23,500,000 23,500,000  
Amortized Cost [29],[57]               $ 23,500,000            
Fair Value [2],[29],[57]               $ 23,800,000            
Investment, Identifier [Axis]: Star Mountain Diversified Credit Income Fund III, LP, Private Equity, Financial Services                            
Principal (in shares) | shares [15],[34],[56] 23,500,000 23,500,000 23,500,000 23,500,000 23,500,000 23,500,000 23,500,000              
Amortized Cost [34],[56] $ 23,500,000                          
Fair Value [1],[34],[56] $ 24,300,000                          
Investment, Identifier [Axis]: Stuart Weitzman Inc, Common Stock, Consumer Durables & Apparel                            
Principal (in shares) | shares 5,451 [9],[33] 5,451 [9],[33] 5,451 [9],[33] 5,451 [9],[33] 5,451 [9],[33] 5,451 [9],[33] 5,451 [9],[33] 5,451 [13],[28] 5,451 [13],[28] 5,451 [13],[28] 5,451 [13],[28] 5,451 [13],[28] 5,451 [13],[28]  
Amortized Cost $ 0 [9],[33]             $ 0 [13],[28]            
Fair Value $ 0 [1],[9],[33]             $ 0 [2],[13],[28]            
Investment, Identifier [Axis]: Summit Interconnect Inc, Capital Goods                            
Rate, basis spread on variable rate [8],[9],[18],[23],[24],[43] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%              
Floor [8],[9],[18],[23],[24],[43] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [9],[15],[18],[23],[24],[43] $ 135,700,000                          
Amortized Cost [9],[18],[23],[24],[43] 134,700,000                          
Fair Value [1],[9],[18],[23],[24],[43] $ 125,400,000                          
Investment, Identifier [Axis]: Summit Interconnect Inc, Capital Goods 1                            
Rate, basis spread on variable rate [10],[11],[12],[13],[21],[22],[42]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Floor [11],[12],[13],[21],[22],[42]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [11],[12],[13],[16],[21],[22],[42]               $ 136,500,000            
Amortized Cost [11],[12],[13],[21],[22],[42]               135,400,000            
Fair Value [2],[11],[12],[13],[21],[22],[42]               $ 128,700,000            
Investment, Identifier [Axis]: Summit Interconnect Inc, Capital Goods 2                            
Rate, basis spread on variable rate [10],[19]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Floor [19]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [16],[19]               $ 9,400,000            
Amortized Cost [19]               9,400,000            
Fair Value [2],[19]               8,900,000            
Investment, Identifier [Axis]: SunPower Financial, Private Equity, Financial Services                            
Principal (in shares) | shares [9],[15],[33],[34] 3,690,938 3,690,938 3,690,938 3,690,938 3,690,938 3,690,938 3,690,938              
Amortized Cost [9],[33],[34] $ 3,700,000                          
Fair Value [1],[9],[33],[34] 3,700,000                          
Investment, Identifier [Axis]: Sungard Availability Services Capital Inc 1                            
Fair Value [61] 0             500,000            
Investment, Identifier [Axis]: Sungard Availability Services Capital Inc 1, Senior Secured Loans—First Lien                            
Fair Value [7]               500,000           6,000,000.0
Investment, Identifier [Axis]: Sungard Availability Services Capital Inc 2                            
Fair Value [61] 0             2,000,000.0            
Investment, Identifier [Axis]: Sungard Availability Services Capital Inc 2, Senior Secured Loans—First Lien                            
Fair Value [7]               2,000,000.0           0
Investment, Identifier [Axis]: Sungard Availability Services Capital Inc 3                            
Fair Value [61] $ 0             $ 0            
Investment, Identifier [Axis]: Sungard Availability Services Capital Inc, Software & Services                            
Rate, basis spread on variable rate [10],[13],[25],[28],[45]               4.00% 4.00% 4.00% 4.00% 4.00% 4.00%  
Rate, PIK [10],[13],[25],[28],[45]               2.80% 2.80% 2.80% 2.80% 2.80% 2.80%  
Rate, Max PIK [10],[13],[25],[28],[45]               2.80% 2.80% 2.80% 2.80% 2.80% 2.80%  
Floor [13],[25],[28],[45]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [13],[16],[25],[28],[45]               $ 15,100,000            
Amortized Cost [13],[25],[28],[45]               13,500,000            
Fair Value [2],[13],[25],[28],[45]               $ 0            
Investment, Identifier [Axis]: Sungard Availability Services Capital Inc, Software & Services                            
Rate, basis spread on variable rate [8],[9],[30],[33] 3.75% 3.75% 3.75% 3.75% 3.75% 3.75% 3.75%              
Rate, PIK [8],[9],[30],[33] 3.80% 3.80% 3.80% 3.80% 3.80% 3.80% 3.80%              
Rate, Max PIK [8],[9],[30],[33] 3.80% 3.80% 3.80% 3.80% 3.80% 3.80% 3.80%              
Floor [8],[9],[30],[33] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [9],[15],[30],[33] $ 5,400,000                          
Amortized Cost [9],[30],[33] 5,100,000                          
Fair Value [1],[9],[30],[33] $ 400,000                          
Investment, Identifier [Axis]: Sungard Availability Services Capital Inc, Software & Services 1                            
Rate, basis spread on variable rate [10],[13],[45]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Rate, PIK [10],[13],[45]               8.50% 8.50% 8.50% 8.50% 8.50% 8.50%  
Rate, Max PIK [10],[13],[45]               8.50% 8.50% 8.50% 8.50% 8.50% 8.50%  
Floor [13],[45]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%  
Principal Amount [13],[16],[45]               $ 2,000,000.0            
Amortized Cost [13],[45]               2,000,000.0            
Fair Value [2],[13],[45]               $ 2,000,000.0            
Investment, Identifier [Axis]: Sungard Availability Services Capital Inc, Software & Services 2                            
Rate, basis spread on variable rate [10],[13],[25],[28],[45]               3.75% 3.75% 3.75% 3.75% 3.75% 3.75%  
Rate, PIK [10],[13],[25],[28],[45]               3.80% 3.80% 3.80% 3.80% 3.80% 3.80%  
Rate, Max PIK [10],[13],[25],[28],[45]               3.80% 3.80% 3.80% 3.80% 3.80% 3.80%  
Floor [13],[25],[28],[45]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [13],[16],[25],[28],[45]               $ 6,100,000            
Amortized Cost [13],[25],[28],[45]               5,800,000            
Fair Value [2],[13],[25],[28],[45]               $ 500,000            
Investment, Identifier [Axis]: Sungard Availability Services Capital Inc, Software & Services 3                            
Rate, basis spread on variable rate [10],[19],[45]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Rate, PIK [10],[19],[45]               8.50% 8.50% 8.50% 8.50% 8.50% 8.50%  
Rate, Max PIK [10],[19],[45]               8.50% 8.50% 8.50% 8.50% 8.50% 8.50%  
Floor [19],[45]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%  
Principal Amount [16],[19],[45]               $ 1,200,000            
Amortized Cost [19],[45]               1,200,000            
Fair Value [2],[19],[45]               1,200,000            
Investment, Identifier [Axis]: Sungard Availbaility Services Capital Inc, Common Stock, Equity/Other                            
Fair Value [7]               $ 0           0
Investment, Identifier [Axis]: Sweeping Corp of America Inc, Commercial & Professional Services 1                            
Rate, basis spread on variable rate 5.75% [8],[9],[43] 5.75% [8],[9],[43] 5.75% [8],[9],[43] 5.75% [8],[9],[43] 5.75% [8],[9],[43] 5.75% [8],[9],[43] 5.75% [8],[9],[43] 5.75% [10],[13],[42] 5.75% [10],[13],[42] 5.75% [10],[13],[42] 5.75% [10],[13],[42] 5.75% [10],[13],[42] 5.75% [10],[13],[42]  
Floor 1.00% [8],[9],[43] 1.00% [8],[9],[43] 1.00% [8],[9],[43] 1.00% [8],[9],[43] 1.00% [8],[9],[43] 1.00% [8],[9],[43] 1.00% [8],[9],[43] 1.00% [13],[42] 1.00% [13],[42] 1.00% [13],[42] 1.00% [13],[42] 1.00% [13],[42] 1.00% [13],[42]  
Principal Amount $ 71,700,000 [9],[15],[43]             $ 72,200,000 [13],[16],[42]            
Amortized Cost 70,000,000.0 [9],[43]             70,200,000 [13],[42]            
Fair Value $ 66,600,000 [1],[9],[43]             $ 72,200,000 [2],[13],[42]            
Investment, Identifier [Axis]: Sweeping Corp of America Inc, Commercial & Professional Services 2                            
Rate, basis spread on variable rate 5.75% [8],[9] 5.75% [8],[9] 5.75% [8],[9] 5.75% [8],[9] 5.75% [8],[9] 5.75% [8],[9] 5.75% [8],[9] 5.75% [10],[13] 5.75% [10],[13] 5.75% [10],[13] 5.75% [10],[13] 5.75% [10],[13] 5.75% [10],[13]  
Floor 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13]  
Principal Amount $ 5,600,000 [9],[15]             $ 1,000,000.0 [13],[16]            
Amortized Cost 5,500,000 [9]             1,000,000.0 [13]            
Fair Value $ 5,200,000 [1],[9]             $ 1,000,000.0 [2],[13]            
Investment, Identifier [Axis]: Sweeping Corp of America Inc, Commercial & Professional Services 3                            
Rate, basis spread on variable rate 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19]  
Floor 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19]  
Principal Amount $ 100,000 [15],[20]             $ 4,700,000 [16],[19]            
Amortized Cost 100,000 [20]             4,700,000 [19]            
Fair Value $ 100,000 [1],[20]             $ 4,700,000 [2],[19]            
Investment, Identifier [Axis]: Swift Worldwide Resources Holdco Ltd, Common Stock, Energy                            
Principal (in shares) | shares [9],[33] 1,250,000 1,250,000 1,250,000 1,250,000 1,250,000 1,250,000 1,250,000              
Amortized Cost [9],[33] $ 1,200,000                          
Fair Value [1],[9],[33] $ 1,000,000.0                          
Investment, Identifier [Axis]: Swift Worldwide Resources Holdco Ltd, Common Stock, Energy                            
Principal (in shares) | shares [13],[28]               1,250,000 1,250,000 1,250,000 1,250,000 1,250,000 1,250,000  
Amortized Cost [13],[28]               $ 1,200,000            
Fair Value [2],[13],[28]               $ 1,000,000.0            
Investment, Identifier [Axis]: Synovus Financial Corp, Private Equity, Banks                            
Principal (in shares) | shares [9],[15],[34] 9,658,318 9,658,318 9,658,318 9,658,318 9,658,318 9,658,318 9,658,318              
Amortized Cost [9],[34] $ 9,700,000                          
Fair Value [1],[9],[34] $ 9,700,000                          
Investment, Identifier [Axis]: TDC LLP, Preferred Equity, Financial Services 1                            
Rate, stated interest rate [8],[9],[34],[35] 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%              
Principal Amount | £ [9],[15],[34],[35]         £ 6.8                  
Amortized Cost [9],[34],[35] $ 8,100,000                          
Fair Value [1],[9],[34],[35] $ 8,300,000                          
Investment, Identifier [Axis]: TDC LLP, Private Equity, Financial Services 2                            
Principal (in shares) | shares [9],[15],[33],[34],[35] 1,576,060 1,576,060 1,576,060 1,576,060 1,576,060 1,576,060 1,576,060              
Amortized Cost [9],[33],[34],[35] $ 2,000,000.0                          
Fair Value [1],[9],[33],[34],[35] $ 1,900,000                          
Investment, Identifier [Axis]: TIBCO Software Inc, Preferred Stock, Software & Services                            
Rate, PIK 12.00% [8],[9] 12.00% [8],[9] 12.00% [8],[9] 12.00% [8],[9] 12.00% [8],[9] 12.00% [8],[9] 12.00% [8],[9] 12.00% [10],[13] 12.00% [10],[13] 12.00% [10],[13] 12.00% [10],[13] 12.00% [10],[13] 12.00% [10],[13]  
Rate, Max PIK 12.00% [8],[9] 12.00% [8],[9] 12.00% [8],[9] 12.00% [8],[9] 12.00% [8],[9] 12.00% [8],[9] 12.00% [8],[9] 12.00% [10],[13] 12.00% [10],[13] 12.00% [10],[13] 12.00% [10],[13] 12.00% [10],[13] 12.00% [10],[13]  
Floor 0.50% [8],[9] 0.50% [8],[9] 0.50% [8],[9] 0.50% [8],[9] 0.50% [8],[9] 0.50% [8],[9] 0.50% [8],[9] 0.50% [13] 0.50% [13] 0.50% [13] 0.50% [13] 0.50% [13] 0.50% [13]  
Principal (in shares) | shares 110,804,060 [9] 110,804,060 [9] 110,804,060 [9] 110,804,060 [9] 110,804,060 [9] 110,804,060 [9] 110,804,060 [9] 133,186,150 [13] 133,186,150 [13] 133,186,150 [13] 133,186,150 [13] 133,186,150 [13] 133,186,150 [13]  
Amortized Cost $ 105,900,000 [9]             $ 127,300,000 [13]            
Fair Value $ 116,300,000 [1],[9]             $ 129,600,000 [2],[13]            
Investment, Identifier [Axis]: TIBCO Software Inc, Software & Services                            
Rate, basis spread on variable rate [8],[9],[40] 4.50% 4.50% 4.50% 4.50% 4.50% 4.50% 4.50%              
Floor [8],[9],[40] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%              
Principal Amount [9],[15],[40] $ 39,700,000                          
Amortized Cost [9],[40] 36,500,000                          
Fair Value [1],[9],[40] $ 38,300,000                          
Investment, Identifier [Axis]: TIBCO Software Inc, Software & Services 1                            
Rate, basis spread on variable rate [10],[13],[41]               4.50% 4.50% 4.50% 4.50% 4.50% 4.50%  
Rate, stated interest rate [8],[9],[40] 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%              
Floor [13],[41]               0.50% 0.50% 0.50% 0.50% 0.50% 0.50%  
Principal Amount $ 1,000,000.0 [9],[15],[40]             $ 39,900,000 [13],[16],[41]            
Amortized Cost 900,000 [9],[40]             36,400,000 [13],[41]            
Fair Value $ 900,000 [1],[9],[40]             $ 35,700,000 [2],[13],[41]            
Investment, Identifier [Axis]: TIBCO Software Inc, Software & Services 2                            
Rate, stated interest rate 9.00% [8],[9],[40] 9.00% [8],[9],[40] 9.00% [8],[9],[40] 9.00% [8],[9],[40] 9.00% [8],[9],[40] 9.00% [8],[9],[40] 9.00% [8],[9],[40] 6.50% [10],[13],[41] 6.50% [10],[13],[41] 6.50% [10],[13],[41] 6.50% [10],[13],[41] 6.50% [10],[13],[41] 6.50% [10],[13],[41]  
Principal Amount $ 25,000,000.0 [9],[15],[40]             $ 1,000,000.0 [13],[16],[41]            
Amortized Cost 19,700,000 [9],[40]             800,000 [13],[41]            
Fair Value $ 21,800,000 [1],[9],[40]             $ 800,000 [2],[13],[41]            
Investment, Identifier [Axis]: TalkTalk Telecom Group Ltd,                            
Rate, basis spread on variable rate [8],[9],[34] 7.00% 7.00% 7.00% 7.00% 7.00% 7.00% 7.00%              
Floor [8],[9],[34] 1.50% 1.50% 1.50% 1.50% 1.50% 1.50% 1.50%              
Principal Amount | £ [9],[15],[34]         £ 31.8                  
Amortized Cost [9],[34] $ 40,100,000                          
Fair Value [1],[9],[34] $ 38,800,000                          
Investment, Identifier [Axis]: TalkTalk Telecom Group Ltd, Commercial & Professional Services 2                            
Rate, basis spread on variable rate [8],[20],[34] 7.00% 7.00% 7.00% 7.00% 7.00% 7.00% 7.00%              
Floor [8],[20],[34] 1.50% 1.50% 1.50% 1.50% 1.50% 1.50% 1.50%              
Principal Amount | £ [15],[20],[34]         £ 11.6                  
Amortized Cost [20],[34] $ 14,500,000                          
Fair Value [1],[20],[34] $ 14,600,000                          
Investment, Identifier [Axis]: Tangoe LLC, Software & Services 1                            
Rate, basis spread on variable rate 6.50% [8],[9],[37],[43] 6.50% [8],[9],[37],[43] 6.50% [8],[9],[37],[43] 6.50% [8],[9],[37],[43] 6.50% [8],[9],[37],[43] 6.50% [8],[9],[37],[43] 6.50% [8],[9],[37],[43] 6.50% [10],[13],[38],[42] 6.50% [10],[13],[38],[42] 6.50% [10],[13],[38],[42] 6.50% [10],[13],[38],[42] 6.50% [10],[13],[38],[42] 6.50% [10],[13],[38],[42]  
Floor 1.00% [8],[9],[37],[43] 1.00% [8],[9],[37],[43] 1.00% [8],[9],[37],[43] 1.00% [8],[9],[37],[43] 1.00% [8],[9],[37],[43] 1.00% [8],[9],[37],[43] 1.00% [8],[9],[37],[43] 1.00% [13],[38],[42] 1.00% [13],[38],[42] 1.00% [13],[38],[42] 1.00% [13],[38],[42] 1.00% [13],[38],[42] 1.00% [13],[38],[42]  
Principal Amount $ 179,500,000 [9],[15],[37],[43]             $ 179,500,000 [13],[16],[38],[42]            
Amortized Cost 168,000,000.0 [9],[37],[43]             165,300,000 [13],[38],[42]            
Fair Value $ 154,900,000 [1],[9],[37],[43]             $ 147,200,000 [2],[13],[38],[42]            
Investment, Identifier [Axis]: Tangoe LLC, Software & Services 2                            
Rate, PIK 12.50% [8],[9],[30],[33],[37],[43] 12.50% [8],[9],[30],[33],[37],[43] 12.50% [8],[9],[30],[33],[37],[43] 12.50% [8],[9],[30],[33],[37],[43] 12.50% [8],[9],[30],[33],[37],[43] 12.50% [8],[9],[30],[33],[37],[43] 12.50% [8],[9],[30],[33],[37],[43] 12.50% [10],[13],[38],[42] 12.50% [10],[13],[38],[42] 12.50% [10],[13],[38],[42] 12.50% [10],[13],[38],[42] 12.50% [10],[13],[38],[42] 12.50% [10],[13],[38],[42]  
Rate, Max PIK 12.50% [8],[9],[30],[33],[37],[43] 12.50% [8],[9],[30],[33],[37],[43] 12.50% [8],[9],[30],[33],[37],[43] 12.50% [8],[9],[30],[33],[37],[43] 12.50% [8],[9],[30],[33],[37],[43] 12.50% [8],[9],[30],[33],[37],[43] 12.50% [8],[9],[30],[33],[37],[43] 12.50% [10],[13],[38],[42] 12.50% [10],[13],[38],[42] 12.50% [10],[13],[38],[42] 12.50% [10],[13],[38],[42] 12.50% [10],[13],[38],[42] 12.50% [10],[13],[38],[42]  
Principal Amount $ 8,000,000.0 [9],[15],[30],[33],[37],[43]             $ 3,300,000 [13],[16],[38],[42]            
Amortized Cost 7,200,000 [9],[30],[33],[37],[43]             3,300,000 [13],[38],[42]            
Fair Value $ 0 [1],[9],[30],[33],[37],[43]             $ 2,600,000 [2],[13],[38],[42]            
Investment, Identifier [Axis]: TeamSystem SpA, Software & Services                            
Rate, basis spread on variable rate 6.25% [8],[9],[34] 6.25% [8],[9],[34] 6.25% [8],[9],[34] 6.25% [8],[9],[34] 6.25% [8],[9],[34] 6.25% [8],[9],[34] 6.25% [8],[9],[34] 6.25% [10],[13],[29],[42] 6.25% [10],[13],[29],[42] 6.25% [10],[13],[29],[42] 6.25% [10],[13],[29],[42] 6.25% [10],[13],[29],[42] 6.25% [10],[13],[29],[42]  
Floor 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [13],[29] 0.00% [13],[29] 0.00% [13],[29] 0.00% [13],[29] 0.00% [13],[29] 0.00% [13],[29]  
Principal Amount | €   € 19.8 [9],[15],[34]             € 19.8 [13],[16],[29]          
Amortized Cost $ 19,000,000.0 [9],[34]             $ 18,900,000 [13],[29]            
Fair Value 21,000,000.0 [1],[9],[34]             21,400,000 [2],[13],[29]            
Investment, Identifier [Axis]: Tekfor HoldCo (formerly Amtek Global Technology Pte Ltd)                            
Fair Value 0             3,900,000            
Investment, Identifier [Axis]: Tekfor HoldCo (formerly Amtek Global Technology Pte Ltd), Automobiles & Components                            
Principal Amount | €   € 38.2 [9],[15],[33],[34]             € 36.7 [13],[16],[28],[29],[36]          
Amortized Cost 40,100,000 [9],[33],[34]             40,100,000 [13],[28],[29],[36]            
Fair Value 4,000,000.0 [1],[9],[33],[34]             3,900,000 [2],[13],[28],[29],[36]            
Investment, Identifier [Axis]: ThermaSys Corp                            
Fair Value 0             $ 8,600,000            
Investment, Identifier [Axis]: ThermaSys Corp, Capital Goods                            
Rate, PIK [10],[13],[25],[28],[45]               11.00% 11.00% 11.00% 11.00% 11.00% 11.00%  
Rate, Max PIK [10],[13],[25],[28],[45]               11.00% 11.00% 11.00% 11.00% 11.00% 11.00%  
Floor [13],[25],[28],[45]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [13],[16],[25],[28],[45]               $ 9,700,000            
Amortized Cost [13],[25],[28],[45]               8,300,000            
Fair Value [2],[13],[25],[28],[45]               8,600,000            
Investment, Identifier [Axis]: ThermaSys Corp, Common Stock                            
Fair Value $ 0             $ 0            
Investment, Identifier [Axis]: ThermaSys Corp, Common Stock, Capital Goods                            
Principal (in shares) | shares 17,383,026 [9],[33],[44],[53] 17,383,026 [9],[33],[44],[53] 17,383,026 [9],[33],[44],[53] 17,383,026 [9],[33],[44],[53] 17,383,026 [9],[33],[44],[53] 17,383,026 [9],[33],[44],[53] 17,383,026 [9],[33],[44],[53] 17,383,026 [13],[28],[45],[54] 17,383,026 [13],[28],[45],[54] 17,383,026 [13],[28],[45],[54] 17,383,026 [13],[28],[45],[54] 17,383,026 [13],[28],[45],[54] 17,383,026 [13],[28],[45],[54]  
Amortized Cost $ 10,200,000 [9],[33],[44],[53]             $ 10,200,000 [13],[28],[45],[54]            
Fair Value 0 [1],[9],[33],[44],[53]             0 [2],[13],[28],[45],[54]            
Investment, Identifier [Axis]: ThermaSys Corp, Common Stock, Equity/Other                            
Fair Value               0           0
Investment, Identifier [Axis]: ThermaSys Corp, Preferred Stock                            
Fair Value $ 0             $ 0            
Investment, Identifier [Axis]: ThermaSys Corp, Preferred Stock, Capital Goods                            
Principal (in shares) | shares [13],[28],[45]               1,529 1,529 1,529 1,529 1,529 1,529  
Amortized Cost [13],[28],[45]               $ 1,700,000            
Fair Value [2],[13],[28],[45]               0            
Investment, Identifier [Axis]: ThermaSys Corp, Preferred Stock, Equity/Other                            
Fair Value               0           0
Investment, Identifier [Axis]: ThermaSys Corp, Senior Secured Loans—First Lien                            
Fair Value               $ 8,600,000           3,500,000
Investment, Identifier [Axis]: ThreeSixty Group, Consumer Discretionary Distribution & Retail 1                            
Rate, basis spread on variable rate [8],[9],[23] 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%              
Rate, PIK [8],[9],[23] 2.50% 2.50% 2.50% 2.50% 2.50% 2.50% 2.50%              
Rate, Max PIK [8],[9],[23] 2.50% 2.50% 2.50% 2.50% 2.50% 2.50% 2.50%              
Floor [8],[9],[23] 1.50% 1.50% 1.50% 1.50% 1.50% 1.50% 1.50%              
Principal Amount [9],[15],[23] $ 46,000,000.0                          
Amortized Cost [9],[23] 45,900,000                          
Fair Value [1],[9],[23] $ 45,500,000                          
Investment, Identifier [Axis]: ThreeSixty Group, Consumer Discretionary Distribution & Retail 2                            
Rate, basis spread on variable rate [8],[9],[23] 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%              
Rate, PIK [8],[9],[23] 2.50% 2.50% 2.50% 2.50% 2.50% 2.50% 2.50%              
Rate, Max PIK [8],[9],[23] 2.50% 2.50% 2.50% 2.50% 2.50% 2.50% 2.50%              
Floor [8],[9],[23] 1.50% 1.50% 1.50% 1.50% 1.50% 1.50% 1.50%              
Principal Amount [9],[15],[23] $ 45,800,000                          
Amortized Cost [9],[23] 45,700,000                          
Fair Value [1],[9],[23] $ 45,400,000                          
Investment, Identifier [Axis]: ThreeSixty Group, Retailing 1                            
Rate, basis spread on variable rate [10],[13],[21],[42]               5.00% 5.00% 5.00% 5.00% 5.00% 5.00%  
Rate, PIK [10],[13],[21],[42]               2.50% 2.50% 2.50% 2.50% 2.50% 2.50%  
Rate, Max PIK [10],[13],[21],[42]               2.50% 2.50% 2.50% 2.50% 2.50% 2.50%  
Floor [13],[21],[42]               1.50% 1.50% 1.50% 1.50% 1.50% 1.50%  
Principal Amount [13],[16],[21],[42]               $ 46,100,000            
Amortized Cost [13],[21],[42]               46,100,000            
Fair Value [2],[13],[21],[42]               $ 45,100,000            
Investment, Identifier [Axis]: ThreeSixty Group, Retailing 2                            
Rate, basis spread on variable rate [10],[13],[42]               5.00% 5.00% 5.00% 5.00% 5.00% 5.00%  
Rate, PIK [10],[13],[42]               2.50% 2.50% 2.50% 2.50% 2.50% 2.50%  
Rate, Max PIK [10],[13],[42]               2.50% 2.50% 2.50% 2.50% 2.50% 2.50%  
Floor [13],[42]               1.50% 1.50% 1.50% 1.50% 1.50% 1.50%  
Principal Amount [13],[16],[42]               $ 45,900,000            
Amortized Cost [13],[42]               45,900,000            
Fair Value [2],[13],[42]               $ 44,800,000            
Investment, Identifier [Axis]: Time Manufacturing Co, Capital Goods 1                            
Rate, basis spread on variable rate 6.50% [8],[9] 6.50% [8],[9] 6.50% [8],[9] 6.50% [8],[9] 6.50% [8],[9] 6.50% [8],[9] 6.50% [8],[9] 6.50% [10],[13] 6.50% [10],[13] 6.50% [10],[13] 6.50% [10],[13] 6.50% [10],[13] 6.50% [10],[13]  
Floor 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13]  
Principal Amount $ 45,100,000 [9],[15]             $ 45,400,000 [13],[16]            
Amortized Cost 44,400,000 [9]             44,500,000 [13]            
Fair Value $ 42,300,000 [1],[9]             $ 42,700,000 [2],[13]            
Investment, Identifier [Axis]: Time Manufacturing Co, Capital Goods 2                            
Rate, basis spread on variable rate 6.50% [8],[9] 6.50% [8],[9] 6.50% [8],[9] 6.50% [8],[9] 6.50% [8],[9] 6.50% [8],[9] 6.50% [8],[9] 6.50% [10],[13] 6.50% [10],[13] 6.50% [10],[13] 6.50% [10],[13] 6.50% [10],[13] 6.50% [10],[13]  
Floor 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13]  
Principal Amount $ 5,300,000 [9],[15]             $ 7,300,000 [13],[16]            
Amortized Cost 5,300,000 [9]             7,300,000 [13]            
Fair Value $ 5,000,000.0 [1],[9]             $ 6,900,000 [2],[13]            
Investment, Identifier [Axis]: Time Manufacturing Co, Capital Goods 3                            
Rate, basis spread on variable rate 6.50% [8],[9] 6.50% [8],[9] 6.50% [8],[9] 6.50% [8],[9] 6.50% [8],[9] 6.50% [8],[9] 6.50% [8],[9] 6.50% [10],[13] 6.50% [10],[13] 6.50% [10],[13] 6.50% [10],[13] 6.50% [10],[13] 6.50% [10],[13]  
Floor 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [8],[9] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13]  
Principal Amount | €   € 13.6 [9],[15]             € 13.7 [13],[16]          
Amortized Cost $ 14,400,000 [9]             $ 14,400,000 [13]            
Fair Value $ 13,500,000 [1],[9]             $ 13,800,000 [2],[13]            
Investment, Identifier [Axis]: Time Manufacturing Co, Capital Goods 4                            
Rate, basis spread on variable rate 6.50% [8],[20] 6.50% [8],[20] 6.50% [8],[20] 6.50% [8],[20] 6.50% [8],[20] 6.50% [8],[20] 6.50% [8],[20] 6.50% [10],[19] 6.50% [10],[19] 6.50% [10],[19] 6.50% [10],[19] 6.50% [10],[19] 6.50% [10],[19]  
Floor 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19]  
Principal Amount $ 16,800,000 [15],[20]             $ 14,800,000 [16],[19]            
Amortized Cost 16,800,000 [20]             14,800,000 [19]            
Fair Value $ 15,700,000 [1],[20]             13,900,000 [2],[19]            
Investment, Identifier [Axis]: Toorak Capital Funding LLC, Membership Interest                            
Fair Value               $ 0           1,700,000
Investment, Identifier [Axis]: Transaction Services Group Ltd, Software & Services 1                            
Rate, basis spread on variable rate 5.50% [8],[9],[34] 5.50% [8],[9],[34] 5.50% [8],[9],[34] 5.50% [8],[9],[34] 5.50% [8],[9],[34] 5.50% [8],[9],[34] 5.50% [8],[9],[34] 5.50% [10],[13],[29] 5.50% [10],[13],[29] 5.50% [10],[13],[29] 5.50% [10],[13],[29] 5.50% [10],[13],[29] 5.50% [10],[13],[29]  
Floor 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [13],[29] 0.00% [13],[29] 0.00% [13],[29] 0.00% [13],[29] 0.00% [13],[29] 0.00% [13],[29]  
Principal Amount           $ 48.3 [9],[15],[34]             $ 48.3 [13],[16],[29]  
Amortized Cost $ 34,500,000 [9],[34]             $ 34,200,000 [13],[29]            
Fair Value $ 31,100,000 [1],[9],[34]             $ 32,100,000 [2],[13],[29]            
Investment, Identifier [Axis]: Transaction Services Group Ltd, Software & Services 2                            
Rate, basis spread on variable rate 5.50% [8],[9],[23],[34] 5.50% [8],[9],[23],[34] 5.50% [8],[9],[23],[34] 5.50% [8],[9],[23],[34] 5.50% [8],[9],[23],[34] 5.50% [8],[9],[23],[34] 5.50% [8],[9],[23],[34] 5.50% [10],[13],[21],[29] 5.50% [10],[13],[21],[29] 5.50% [10],[13],[21],[29] 5.50% [10],[13],[21],[29] 5.50% [10],[13],[21],[29] 5.50% [10],[13],[21],[29]  
Floor 0.00% [8],[9],[23],[34] 0.00% [8],[9],[23],[34] 0.00% [8],[9],[23],[34] 0.00% [8],[9],[23],[34] 0.00% [8],[9],[23],[34] 0.00% [8],[9],[23],[34] 0.00% [8],[9],[23],[34] 0.00% [13],[21],[29] 0.00% [13],[21],[29] 0.00% [13],[21],[29] 0.00% [13],[21],[29] 0.00% [13],[21],[29] 0.00% [13],[21],[29]  
Principal Amount $ 126,200,000 [9],[15],[23],[34]             $ 126,200,000 [13],[16],[21],[29]            
Amortized Cost 123,500,000 [9],[23],[34]             122,900,000 [13],[21],[29]            
Fair Value $ 126,200,000 [1],[9],[23],[34]             $ 123,500,000 [2],[13],[21],[29]            
Investment, Identifier [Axis]: Trescal SA, Commercial & Professional Services 1                            
Rate, basis spread on variable rate [8],[9],[34] 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%              
Floor [8],[9],[34] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%              
Principal Amount | € [9],[15],[34]   € 7.9                        
Amortized Cost [9],[34] $ 8,500,000                          
Fair Value [1],[9],[34] $ 8,200,000                          
Investment, Identifier [Axis]: Trescal SA, Commercial & Professional Services 2                            
Rate, basis spread on variable rate [8],[9],[34] 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%              
Floor [8],[9],[34] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%              
Principal Amount [9],[15],[34] $ 8,600,000                          
Amortized Cost [9],[34] 8,400,000                          
Fair Value [1],[9],[34] $ 8,400,000                          
Investment, Identifier [Axis]: Trescal SA, Commercial & Professional Services 3                            
Rate, basis spread on variable rate [8],[20],[34] 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%              
Floor [8],[20],[34] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%              
Principal Amount | € [15],[20],[34]   € 4.6                        
Amortized Cost [20],[34] $ 5,000,000.0                          
Fair Value [1],[20],[34] $ 4,900,000                          
Investment, Identifier [Axis]: TruckPro LLC, Capital Goods                            
Rate, stated interest rate 11.00% [8],[9],[40] 11.00% [8],[9],[40] 11.00% [8],[9],[40] 11.00% [8],[9],[40] 11.00% [8],[9],[40] 11.00% [8],[9],[40] 11.00% [8],[9],[40] 11.00% [10],[13],[41] 11.00% [10],[13],[41] 11.00% [10],[13],[41] 11.00% [10],[13],[41] 11.00% [10],[13],[41] 11.00% [10],[13],[41]  
Principal Amount $ 9,200,000 [9],[15],[40]             $ 9,200,000 [13],[16],[41]            
Amortized Cost 9,200,000 [9],[40]             9,200,000 [13],[41]            
Fair Value $ 9,200,000 [1],[9],[40]             $ 9,100,000 [2],[13],[41]            
Investment, Identifier [Axis]: Ultra Electronics Holdings Ltd, Capital Goods 1                            
Rate, basis spread on variable rate [8],[34],[40],[43] 3.50% 3.50% 3.50% 3.50% 3.50% 3.50% 3.50%              
Floor [8],[34],[40],[43] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%              
Principal Amount [15],[34],[40],[43] $ 1,800,000                          
Amortized Cost [34],[40],[43] 1,800,000                          
Fair Value [1],[34],[40],[43] $ 1,800,000                          
Investment, Identifier [Axis]: Ultra Electronics Holdings Ltd, Capital Goods 2                            
Rate, basis spread on variable rate [8],[9],[34],[40] 3.25% 3.25% 3.25% 3.25% 3.25% 3.25% 3.25%              
Floor [8],[9],[34],[40] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%              
Principal Amount | € [9],[15],[34],[40]   € 1.4                        
Amortized Cost [9],[34],[40] $ 1,600,000                          
Fair Value [1],[9],[34],[40] $ 1,400,000                          
Investment, Identifier [Axis]: Ultra Electronics Holdings Ltd, Capital Goods 3                            
Rate, basis spread on variable rate [8],[9],[34] 7.25% 7.25% 7.25% 7.25% 7.25% 7.25% 7.25%              
Floor [8],[9],[34] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%              
Principal Amount [9],[15],[34] $ 62,900,000                          
Amortized Cost [9],[34] 61,200,000                          
Fair Value [1],[9],[34] $ 61,500,000                          
Investment, Identifier [Axis]: Ultra Electronics Holdings Ltd, Capital Goods 4                            
Rate, PIK [8],[9],[34] 9.00% 9.00% 9.00% 9.00% 9.00% 9.00% 9.00%              
Rate, Max PIK [8],[9],[34] 9.00% 9.00% 9.00% 9.00% 9.00% 9.00% 9.00%              
Floor [8],[9],[34] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%              
Principal Amount [9],[15],[34] $ 66,100,000                          
Amortized Cost [9],[34] 64,500,000                          
Fair Value [1],[9],[34] $ 63,400,000                          
Investment, Identifier [Axis]: Ultra Electronics Holdings PLC, Capital Goods 1                            
Rate, basis spread on variable rate [10],[13],[29],[41]               3.75% 3.75% 3.75% 3.75% 3.75% 3.75%  
Floor [13],[29],[41]               0.50% 0.50% 0.50% 0.50% 0.50% 0.50%  
Principal Amount [13],[16],[29],[41]               $ 1,800,000            
Amortized Cost [13],[29],[41]               1,800,000            
Fair Value [2],[13],[29],[41]               $ 1,700,000            
Investment, Identifier [Axis]: Ultra Electronics Holdings PLC, Capital Goods 2                            
Rate, basis spread on variable rate [10],[13],[29],[41]               3.75% 3.75% 3.75% 3.75% 3.75% 3.75%  
Floor [13],[29],[41]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%  
Principal Amount | € [13],[16],[29],[41]                 € 1.4          
Amortized Cost [13],[29],[41]               $ 1,600,000            
Fair Value [2],[13],[29],[41]               $ 1,400,000            
Investment, Identifier [Axis]: Ultra Electronics Holdings PLC, Capital Goods 3                            
Rate, basis spread on variable rate [10],[13],[29]               7.25% 7.25% 7.25% 7.25% 7.25% 7.25%  
Floor [13],[29]               0.50% 0.50% 0.50% 0.50% 0.50% 0.50%  
Principal Amount [13],[16],[29]               $ 62,900,000            
Amortized Cost [13],[29]               61,100,000            
Fair Value [2],[13],[29]               $ 58,200,000            
Investment, Identifier [Axis]: Ultra Electronics Holdings PLC, Capital Goods 4                            
Rate, basis spread on variable rate [10],[13],[29]               9.00% 9.00% 9.00% 9.00% 9.00% 9.00%  
Rate, PIK [10],[13],[29]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%  
Rate, Max PIK [10],[13],[29]               9.00% 9.00% 9.00% 9.00% 9.00% 9.00%  
Floor [13],[29]               0.50% 0.50% 0.50% 0.50% 0.50% 0.50%  
Principal Amount [13],[16],[29]               $ 58,200,000            
Amortized Cost [13],[29]               56,500,000            
Fair Value [2],[13],[29]               $ 53,400,000            
Investment, Identifier [Axis]: Ultra Electronics Holdings PLC, Private Equity, Capital Goods 1                            
Principal (in shares) | shares 683,240,044 [9],[33],[34] 683,240,044 [9],[33],[34] 683,240,044 [9],[33],[34] 683,240,044 [9],[33],[34] 683,240,044 [9],[33],[34] 683,240,044 [9],[33],[34] 683,240,044 [9],[33],[34] 683,240,044 [13],[28],[29] 683,240,044 [13],[28],[29] 683,240,044 [13],[28],[29] 683,240,044 [13],[28],[29] 683,240,044 [13],[28],[29] 683,240,044 [13],[28],[29]  
Amortized Cost $ 7,200,000 [9],[33],[34]             $ 7,200,000 [13],[28],[29]            
Fair Value $ 10,500,000 [1],[9],[33],[34]             $ 6,700,000 [2],[13],[28],[29]            
Investment, Identifier [Axis]: Ultra Electronics Holdings PLC, Private Equity, Capital Goods 2                            
Principal (in shares) | shares 1,272,105 [9],[33],[34] 1,272,105 [9],[33],[34] 1,272,105 [9],[33],[34] 1,272,105 [9],[33],[34] 1,272,105 [9],[33],[34] 1,272,105 [9],[33],[34] 1,272,105 [9],[33],[34] 1,272,105 [13],[28],[29] 1,272,105 [13],[28],[29] 1,272,105 [13],[28],[29] 1,272,105 [13],[28],[29] 1,272,105 [13],[28],[29] 1,272,105 [13],[28],[29]  
Amortized Cost $ 1,300,000 [9],[33],[34]             $ 1,300,000 [13],[28],[29]            
Fair Value $ 1,900,000 [1],[9],[33],[34]             $ 1,200,000 [2],[13],[28],[29]            
Investment, Identifier [Axis]: Valeo Foods Group Ltd, Food, Beverage & Tobacco 1                            
Rate, basis spread on variable rate 7.50% [8],[9],[34] 7.50% [8],[9],[34] 7.50% [8],[9],[34] 7.50% [8],[9],[34] 7.50% [8],[9],[34] 7.50% [8],[9],[34] 7.50% [8],[9],[34] 7.50% [10],[13],[29] 7.50% [10],[13],[29] 7.50% [10],[13],[29] 7.50% [10],[13],[29] 7.50% [10],[13],[29] 7.50% [10],[13],[29]  
Floor 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [8],[9],[34] 0.00% [13],[29] 0.00% [13],[29] 0.00% [13],[29] 0.00% [13],[29] 0.00% [13],[29] 0.00% [13],[29]  
Principal Amount | €   € 3.8 [9],[15],[34]             € 3.8 [13],[16],[29]          
Amortized Cost $ 4,100,000 [9],[34]             $ 4,000,000.0 [13],[29]            
Fair Value $ 3,200,000 [1],[9],[34]             $ 3,600,000 [2],[13],[29]            
Investment, Identifier [Axis]: Valeo Foods Group Ltd, Food, Beverage & Tobacco 2                            
Rate, basis spread on variable rate [34] 7.50% [8],[20] 7.50% [8],[20] 7.50% [8],[20] 7.50% [8],[20] 7.50% [8],[20] 7.50% [8],[20] 7.50% [8],[20] 7.50% [10],[19] 7.50% [10],[19] 7.50% [10],[19] 7.50% [10],[19] 7.50% [10],[19] 7.50% [10],[19]  
Floor [34] 0.00% [8],[20] 0.00% [8],[20] 0.00% [8],[20] 0.00% [8],[20] 0.00% [8],[20] 0.00% [8],[20] 0.00% [8],[20] 0.00% [19] 0.00% [19] 0.00% [19] 0.00% [19] 0.00% [19] 0.00% [19]  
Principal Amount | € [34]   € 2.3 [15],[20]             € 2.3 [16],[19]          
Amortized Cost [34] $ 3,000,000.0 [20]             $ 3,100,000 [19]            
Fair Value [34] $ 2,500,000 [1],[20]             $ 2,800,000 [2],[19]            
Investment, Identifier [Axis]: Vantage Specialty Chemicals Inc, Materials                            
Rate, basis spread on variable rate [10],[13],[41]               8.25% 8.25% 8.25% 8.25% 8.25% 8.25%  
Floor [13],[41]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [13],[16],[41]               $ 800,000            
Amortized Cost [13],[41]               700,000            
Fair Value [2],[13],[41]               $ 700,000            
Investment, Identifier [Axis]: Versatile Processing Group Inc, Class A - 2 Units, Materials                            
Principal (in shares) | shares [28],[54]               3,637,500 3,637,500 3,637,500 3,637,500 3,637,500 3,637,500  
Amortized Cost [28],[54]               $ 3,600,000            
Fair Value [2],[28],[54]               $ 0            
Investment, Identifier [Axis]: Version1 Software Ltd, Software & Services                            
Rate, basis spread on variable rate [10],[19],[29]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%  
Rate, PIK [10],[19],[29]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%  
Rate, Max PIK [10],[19],[29]               1.70% 1.70% 1.70% 1.70% 1.70% 1.70%  
Floor [19],[29]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%  
Principal Amount | € [16],[19],[29]                 € 2.4          
Amortized Cost [19],[29]               $ 2,400,000            
Fair Value [2],[19],[29]               $ 2,300,000            
Investment, Identifier [Axis]: Version1 Software Ltd, Software & Services 1                            
Rate, basis spread on variable rate [8],[9],[34] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%              
Rate, PIK [8],[9],[34] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%              
Rate, Max PIK [8],[9],[34] 1.70% 1.70% 1.70% 1.70% 1.70% 1.70% 1.70%              
Floor [8],[9],[34] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%              
Principal Amount | £ [9],[15],[34]         £ 1.1                  
Amortized Cost [9],[34] $ 1,300,000                          
Fair Value [1],[9],[34] $ 1,300,000                          
Investment, Identifier [Axis]: Version1 Software Ltd, Software & Services 2                            
Rate, basis spread on variable rate [8],[20],[34] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%              
Rate, PIK [8],[20],[34] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%              
Rate, Max PIK [8],[20],[34] 1.70% 1.70% 1.70% 1.70% 1.70% 1.70% 1.70%              
Floor [8],[20],[34] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%              
Principal Amount | € [15],[20],[34]   € 1.1                        
Amortized Cost [20],[34] $ 1,100,000                          
Fair Value [1],[20],[34] $ 1,100,000                          
Investment, Identifier [Axis]: Version1 Software Ltd, Software & Services 3                            
Rate, basis spread on variable rate [8],[20],[34] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%              
Floor [8],[20],[34] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%              
Principal Amount | € [15],[20],[34]   € 13.7                        
Amortized Cost [20],[34] $ 14,800,000                          
Fair Value [1],[20],[34] $ 14,000,000.0                          
Investment, Identifier [Axis]: VetCor Professional Practices LLC, Health Care Equipment & Services 1                            
Rate, basis spread on variable rate 5.75% [8],[9],[43] 5.75% [8],[9],[43] 5.75% [8],[9],[43] 5.75% [8],[9],[43] 5.75% [8],[9],[43] 5.75% [8],[9],[43] 5.75% [8],[9],[43] 5.75% [10],[13] 5.75% [10],[13] 5.75% [10],[13] 5.75% [10],[13] 5.75% [10],[13] 5.75% [10],[13]  
Floor 0.80% [8],[9],[43] 0.80% [8],[9],[43] 0.80% [8],[9],[43] 0.80% [8],[9],[43] 0.80% [8],[9],[43] 0.80% [8],[9],[43] 0.80% [8],[9],[43] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13]  
Principal Amount $ 68,300,000 [9],[15],[43]             $ 82,300,000 [13],[16]            
Amortized Cost 67,700,000 [9],[43]             81,500,000 [13]            
Fair Value $ 67,900,000 [1],[9],[43]             $ 80,900,000 [2],[13]            
Investment, Identifier [Axis]: VetCor Professional Practices LLC, Health Care Equipment & Services 2                            
Rate, basis spread on variable rate 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [8],[20] 5.75% [10],[13] 5.75% [10],[13] 5.75% [10],[13] 5.75% [10],[13] 5.75% [10],[13] 5.75% [10],[13]  
Floor 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13]  
Principal Amount $ 6,700,000 [15],[20]             $ 1,800,000 [13],[16]            
Amortized Cost 6,600,000 [20]             1,700,000 [13]            
Fair Value $ 6,700,000 [1],[20]             $ 1,800,000 [2],[13]            
Investment, Identifier [Axis]: VetCor Professional Practices LLC, Health Care Equipment & Services 3                            
Rate, basis spread on variable rate 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19] 5.75% [10],[19]  
Floor 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19]  
Principal Amount $ 8,400,000 [15],[20]             $ 11,000,000.0 [16],[19]            
Amortized Cost 8,400,000 [20]             10,900,000 [19]            
Fair Value $ 8,500,000 [1],[20]             $ 10,800,000 [2],[19]            
Investment, Identifier [Axis]: VetCor Professional Practices LLC, Health Care Equipment & Services 4                            
Rate, basis spread on variable rate [10],[19]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%  
Floor [19]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%  
Principal Amount [16],[19]               $ 4,900,000            
Amortized Cost [19]               4,900,000            
Fair Value [2],[19]               4,800,000            
Investment, Identifier [Axis]: Vytalogy Wellness LLC (fka Jarrow Formulas Inc), Household & Personal Products 1                            
Rate, basis spread on variable rate [8],[9] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%              
Floor [8],[9] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [9],[15] $ 5,300,000                          
Amortized Cost [9] 5,300,000                          
Fair Value [1],[9] $ 5,200,000                          
Investment, Identifier [Axis]: Vytalogy Wellness LLC (fka Jarrow Formulas Inc), Household & Personal Products 2                            
Rate, basis spread on variable rate [8],[9],[17],[18],[23],[24],[43] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%              
Floor [8],[9],[17],[18],[23],[24],[43] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [9],[15],[17],[18],[23],[24],[43] $ 117,900,000                          
Amortized Cost [9],[17],[18],[23],[24],[43] 113,900,000                          
Fair Value [1],[9],[17],[18],[23],[24],[43] 115,200,000                          
Investment, Identifier [Axis]: Warren Resources Inc                            
Fair Value 18,700,000             18,600,000           18,700,000
Investment, Identifier [Axis]: Warren Resources Inc, Common Stock                            
Fair Value $ 14,400,000             $ 29,200,000           20,400,000
Investment, Identifier [Axis]: Warren Resources Inc, Common Stock, Energy                            
Principal (in shares) | shares 3,483,788 [9],[33],[35] 3,483,788 [9],[33],[35] 3,483,788 [9],[33],[35] 3,483,788 [9],[33],[35] 3,483,788 [9],[33],[35] 3,483,788 [9],[33],[35] 3,483,788 [9],[33],[35] 3,483,788 [13],[28],[36] 3,483,788 [13],[28],[36] 3,483,788 [13],[28],[36] 3,483,788 [13],[28],[36] 3,483,788 [13],[28],[36] 3,483,788 [13],[28],[36]  
Amortized Cost $ 12,800,000 [9],[33],[35]             $ 12,800,000 [13],[28],[36]            
Fair Value $ 14,400,000 [1],[9],[33],[35]             $ 29,200,000 [2],[13],[28],[36]            
Investment, Identifier [Axis]: Warren Resources Inc, Energy                            
Rate, basis spread on variable rate 9.00% [8],[9],[35] 9.00% [8],[9],[35] 9.00% [8],[9],[35] 9.00% [8],[9],[35] 9.00% [8],[9],[35] 9.00% [8],[9],[35] 9.00% [8],[9],[35] 9.00% [10],[13],[36] 9.00% [10],[13],[36] 9.00% [10],[13],[36] 9.00% [10],[13],[36] 9.00% [10],[13],[36] 9.00% [10],[13],[36]  
Rate, PIK 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [10],[13],[36] 1.00% [10],[13],[36] 1.00% [10],[13],[36] 1.00% [10],[13],[36] 1.00% [10],[13],[36] 1.00% [10],[13],[36]  
Rate, Max PIK 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [10],[13],[36] 1.00% [10],[13],[36] 1.00% [10],[13],[36] 1.00% [10],[13],[36] 1.00% [10],[13],[36] 1.00% [10],[13],[36]  
Floor 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [8],[9],[35] 1.00% [13],[36] 1.00% [13],[36] 1.00% [13],[36] 1.00% [13],[36] 1.00% [13],[36] 1.00% [13],[36]  
Principal Amount $ 18,700,000 [9],[15],[35]             $ 18,600,000 [13],[16],[36]            
Amortized Cost 18,300,000 [9],[35]             17,800,000 [13],[36]            
Fair Value $ 18,700,000 [1],[9],[35]             $ 18,600,000 [2],[13],[36]            
Investment, Identifier [Axis]: Wealth Enhancement Group LLC, Diversified Financials 1                            
Rate, basis spread on variable rate [10],[13],[29]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Floor [13],[29]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [13],[16],[29]               $ 31,100,000            
Amortized Cost [13],[29]               31,000,000.0            
Fair Value [2],[13],[29]               $ 30,700,000            
Investment, Identifier [Axis]: Wealth Enhancement Group LLC, Diversified Financials 2                            
Rate, basis spread on variable rate [10],[19],[29]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Floor [19],[29]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [16],[19],[29]               $ 3,300,000            
Amortized Cost [19],[29]               3,300,000            
Fair Value [2],[19],[29]               $ 3,200,000            
Investment, Identifier [Axis]: Wealth Enhancement Group LLC, Diversified Financials 3                            
Rate, basis spread on variable rate [10],[19],[29]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Floor [19],[29]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [16],[19],[29]               $ 2,100,000            
Amortized Cost [19],[29]               2,100,000            
Fair Value [2],[19],[29]               $ 2,000,000.0            
Investment, Identifier [Axis]: Wealth Enhancement Group LLC, Financial Services 1                            
Rate, basis spread on variable rate [8],[9],[34] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%              
Floor [8],[9],[34] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [9],[15],[34] $ 4,400,000                          
Amortized Cost [9],[34] 4,400,000                          
Fair Value [1],[9],[34] $ 4,400,000                          
Investment, Identifier [Axis]: Wealth Enhancement Group LLC, Financial Services 2                            
Rate, basis spread on variable rate [8],[20],[34] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%              
Floor [8],[20],[34] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [15],[20],[34] $ 1,800,000                          
Amortized Cost [20],[34] 1,800,000                          
Fair Value [1],[20],[34] $ 1,800,000                          
Investment, Identifier [Axis]: Wealth Enhancement Group LLC, Financial Services 3                            
Rate, basis spread on variable rate [8],[20],[34] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%              
Floor [8],[20],[34] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Principal Amount [15],[20],[34] $ 2,100,000                          
Amortized Cost [20],[34] 2,100,000                          
Fair Value [1],[20],[34] $ 2,100,000                          
Investment, Identifier [Axis]: Wittur Holding GmbH, Capital Goods                            
Rate, basis spread on variable rate 8.50% [8],[9],[30],[33],[34] 8.50% [8],[9],[30],[33],[34] 8.50% [8],[9],[30],[33],[34] 8.50% [8],[9],[30],[33],[34] 8.50% [8],[9],[30],[33],[34] 8.50% [8],[9],[30],[33],[34] 8.50% [8],[9],[30],[33],[34] 8.50% [10],[13],[29] 8.50% [10],[13],[29] 8.50% [10],[13],[29] 8.50% [10],[13],[29] 8.50% [10],[13],[29] 8.50% [10],[13],[29]  
Rate, PIK 1.00% [8],[9],[30],[33],[34] 1.00% [8],[9],[30],[33],[34] 1.00% [8],[9],[30],[33],[34] 1.00% [8],[9],[30],[33],[34] 1.00% [8],[9],[30],[33],[34] 1.00% [8],[9],[30],[33],[34] 1.00% [8],[9],[30],[33],[34] 1.00% [10],[13],[29] 1.00% [10],[13],[29] 1.00% [10],[13],[29] 1.00% [10],[13],[29] 1.00% [10],[13],[29] 1.00% [10],[13],[29]  
Rate, Max PIK 1.00% [8],[9],[30],[33],[34] 1.00% [8],[9],[30],[33],[34] 1.00% [8],[9],[30],[33],[34] 1.00% [8],[9],[30],[33],[34] 1.00% [8],[9],[30],[33],[34] 1.00% [8],[9],[30],[33],[34] 1.00% [8],[9],[30],[33],[34] 1.00% [10],[13],[29] 1.00% [10],[13],[29] 1.00% [10],[13],[29] 1.00% [10],[13],[29] 1.00% [10],[13],[29] 1.00% [10],[13],[29]  
Floor 0.00% [8],[9],[30],[33],[34] 0.00% [8],[9],[30],[33],[34] 0.00% [8],[9],[30],[33],[34] 0.00% [8],[9],[30],[33],[34] 0.00% [8],[9],[30],[33],[34] 0.00% [8],[9],[30],[33],[34] 0.00% [8],[9],[30],[33],[34] 0.00% [13],[29] 0.00% [13],[29] 0.00% [13],[29] 0.00% [13],[29] 0.00% [13],[29] 0.00% [13],[29]  
Principal Amount | €   € 113.9 [9],[15],[30],[33],[34]             € 113.4 [13],[16],[29]          
Amortized Cost $ 122,500,000 [9],[30],[33],[34]             $ 122,500,000 [13],[29]            
Fair Value $ 37,900,000 [1],[9],[30],[33],[34]             $ 86,100,000 [2],[13],[29]            
Investment, Identifier [Axis]: Wittur Holding GmbH, Capital Goods 1                            
Rate, PIK [8],[9],[34] 10.00% 10.00% 10.00% 10.00% 10.00% 10.00% 10.00%              
Rate, Max PIK [8],[9],[34] 10.00% 10.00% 10.00% 10.00% 10.00% 10.00% 10.00%              
Floor [8],[9],[34]              
Principal Amount | € [9],[15],[34]   € 4.0                        
Amortized Cost [9],[34] $ 4,200,000                          
Fair Value [1],[9],[34] $ 4,200,000                          
Investment, Identifier [Axis]: Wittur Holding GmbH, Capital Goods 2                            
Rate, PIK [8],[20],[34] 10.00% 10.00% 10.00% 10.00% 10.00% 10.00% 10.00%              
Rate, Max PIK [8],[20],[34] 10.00% 10.00% 10.00% 10.00% 10.00% 10.00% 10.00%              
Floor [8],[20],[34]              
Principal Amount | € [15],[20],[34]   € 19.6                        
Amortized Cost [20],[34] $ 21,500,000                          
Fair Value [1],[20],[34] $ 21,400,000                          
Investment, Identifier [Axis]: Woolpert Inc, Capital Goods 1                            
Rate, basis spread on variable rate 6.00% [8],[9],[18],[23],[24],[43] 6.00% [8],[9],[18],[23],[24],[43] 6.00% [8],[9],[18],[23],[24],[43] 6.00% [8],[9],[18],[23],[24],[43] 6.00% [8],[9],[18],[23],[24],[43] 6.00% [8],[9],[18],[23],[24],[43] 6.00% [8],[9],[18],[23],[24],[43] 6.00% [10],[11],[12],[21],[22],[42] 6.00% [10],[11],[12],[21],[22],[42] 6.00% [10],[11],[12],[21],[22],[42] 6.00% [10],[11],[12],[21],[22],[42] 6.00% [10],[11],[12],[21],[22],[42] 6.00% [10],[11],[12],[21],[22],[42]  
Floor 1.00% [8],[9],[18],[23],[24],[43] 1.00% [8],[9],[18],[23],[24],[43] 1.00% [8],[9],[18],[23],[24],[43] 1.00% [8],[9],[18],[23],[24],[43] 1.00% [8],[9],[18],[23],[24],[43] 1.00% [8],[9],[18],[23],[24],[43] 1.00% [8],[9],[18],[23],[24],[43] 1.00% [11],[12],[21],[22],[42] 1.00% [11],[12],[21],[22],[42] 1.00% [11],[12],[21],[22],[42] 1.00% [11],[12],[21],[22],[42] 1.00% [11],[12],[21],[22],[42] 1.00% [11],[12],[21],[22],[42]  
Principal Amount $ 158,300,000 [9],[15],[18],[23],[24],[43]             $ 91,000,000.0 [11],[12],[16],[21],[22],[42]            
Amortized Cost 153,000,000.0 [9],[18],[23],[24],[43]             85,100,000 [11],[12],[21],[22],[42]            
Fair Value $ 154,500,000 [1],[9],[18],[23],[24],[43]             $ 88,600,000 [2],[11],[12],[21],[22],[42]            
Investment, Identifier [Axis]: Woolpert Inc, Capital Goods 2                            
Rate, basis spread on variable rate 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [8],[20] 6.00% [10],[13] 6.00% [10],[13] 6.00% [10],[13] 6.00% [10],[13] 6.00% [10],[13] 6.00% [10],[13]  
Floor 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13]  
Principal Amount $ 3,700,000 [15],[20]             $ 68,500,000 [13],[16]            
Amortized Cost 3,700,000 [20]             68,500,000 [13]            
Fair Value $ 3,600,000 [1],[20]             $ 66,700,000 [2],[13]            
Investment, Identifier [Axis]: Woolpert Inc, Capital Goods 3                            
Rate, basis spread on variable rate [10],[19]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Floor [19]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [16],[19]               $ 3,700,000            
Amortized Cost [19]               3,700,000            
Fair Value [2],[19]               $ 3,600,000            
Investment, Identifier [Axis]: Worldwise Inc, Class A Private Equity, Household & Personal Products                            
Principal (in shares) | shares 32,109 [9],[33] 32,109 [9],[33] 32,109 [9],[33] 32,109 [9],[33] 32,109 [9],[33] 32,109 [9],[33] 32,109 [9],[33] 32,109 [13],[28] 32,109 [13],[28] 32,109 [13],[28] 32,109 [13],[28] 32,109 [13],[28] 32,109 [13],[28]  
Amortized Cost $ 1,600,000 [9],[33]             $ 1,600,000 [13],[28]            
Fair Value $ 0 [1],[9],[33]             $ 1,600,000 [2],[13],[28]            
Investment, Identifier [Axis]: Worldwise Inc, Class B Private Equity, Household & Personal Products                            
Principal (in shares) | shares 43,974 [9],[33] 43,974 [9],[33] 43,974 [9],[33] 43,974 [9],[33] 43,974 [9],[33] 43,974 [9],[33] 43,974 [9],[33] 32,109 [13],[28] 32,109 [13],[28] 32,109 [13],[28] 32,109 [13],[28] 32,109 [13],[28] 32,109 [13],[28]  
Amortized Cost $ 2,100,000 [9],[33]             $ 1,600,000 [13],[28]            
Fair Value $ 0 [1],[9],[33]             $ 400,000 [2],[13],[28]            
Investment, Identifier [Axis]: Worldwise Inc, Household & Personal Products 1                            
Rate, basis spread on variable rate 6.25% [8],[9] 6.25% [8],[9] 6.25% [8],[9] 6.25% [8],[9] 6.25% [8],[9] 6.25% [8],[9] 6.25% [8],[9] 6.25% [10],[13] 6.25% [10],[13] 6.25% [10],[13] 6.25% [10],[13] 6.25% [10],[13] 6.25% [10],[13]  
Rate, PIK [8],[9] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%              
Rate, Max PIK [8],[9] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%              
Floor 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13]  
Principal Amount $ 40,800,000 [9],[15]             $ 26,300,000 [13],[16]            
Amortized Cost 40,700,000 [9]             26,300,000 [13]            
Fair Value $ 37,700,000 [1],[9]             $ 24,400,000 [2],[13]            
Investment, Identifier [Axis]: Worldwise Inc, Household & Personal Products 2                            
Rate, basis spread on variable rate 6.75% [8],[9] 6.75% [8],[9] 6.75% [8],[9] 6.75% [8],[9] 6.75% [8],[9] 6.75% [8],[9] 6.75% [8],[9] 6.25% [10],[13] 6.25% [10],[13] 6.25% [10],[13] 6.25% [10],[13] 6.25% [10],[13] 6.25% [10],[13]  
Rate, PIK [8],[9] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%              
Rate, Max PIK [8],[9] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%              
Floor 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [8],[9] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13]  
Principal Amount $ 1,700,000 [9],[15]             $ 20,000,000.0 [13],[16]            
Amortized Cost 1,700,000 [9]             19,800,000 [13]            
Fair Value $ 1,600,000 [1],[9]             $ 18,500,000 [2],[13]            
Investment, Identifier [Axis]: Worldwise Inc, Household & Personal Products 3                            
Rate, basis spread on variable rate 6.25% [8],[20] 6.25% [8],[20] 6.25% [8],[20] 6.25% [8],[20] 6.25% [8],[20] 6.25% [8],[20] 6.25% [8],[20] 6.25% [10],[13] 6.25% [10],[13] 6.25% [10],[13] 6.25% [10],[13] 6.25% [10],[13] 6.25% [10],[13]  
Rate, PIK [8],[20] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%              
Rate, Max PIK [8],[20] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%              
Floor 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13] 1.00% [13]  
Principal Amount $ 28,000,000.0 [15],[20]             $ 7,400,000 [13],[16]            
Amortized Cost 28,000,000.0 [20]             7,400,000 [13]            
Fair Value $ 25,900,000 [1],[20]             $ 6,800,000 [2],[13]            
Investment, Identifier [Axis]: Worldwise Inc, Household & Personal Products 4                            
Rate, basis spread on variable rate 6.75% [8],[20] 6.75% [8],[20] 6.75% [8],[20] 6.75% [8],[20] 6.75% [8],[20] 6.75% [8],[20] 6.75% [8],[20] 6.25% [10],[19] 6.25% [10],[19] 6.25% [10],[19] 6.25% [10],[19] 6.25% [10],[19] 6.25% [10],[19]  
Rate, PIK [8],[20] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%              
Rate, Max PIK [8],[20] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%              
Floor 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [8],[20] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19] 1.00% [19]  
Principal Amount $ 12,500,000 [15],[20]             $ 15,500,000 [16],[19]            
Amortized Cost 12,500,000 [20]             15,500,000 [19]            
Fair Value $ 11,600,000 [1],[20]             $ 14,400,000 [2],[19]            
Investment, Identifier [Axis]: Worldwise Inc, Household & Personal Products 5                            
Rate, basis spread on variable rate [10],[19]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%  
Floor [19]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Principal Amount [16],[19]               $ 6,800,000            
Amortized Cost [19]               6,800,000            
Fair Value [2],[19]               $ 6,300,000            
Investment, Identifier [Axis]: Worldwise Inc, Preferred Equity, Household & Personal Products                            
Rate, PIK [9] 20.00% 20.00% 20.00% 20.00% 20.00% 20.00% 20.00%              
Rate, Max PIK [9] 20.00% 20.00% 20.00% 20.00% 20.00% 20.00% 20.00%              
Principal (in shares) | shares [9] 830,617 830,617 830,617 830,617 830,617 830,617 830,617              
Amortized Cost [9] $ 300,000                          
Fair Value [1],[9] $ 1,200,000                          
Investment, Identifier [Axis]: Zendesk Inc, Software & Services 1                            
Rate, basis spread on variable rate 3.50% [8],[9],[43] 3.50% [8],[9],[43] 3.50% [8],[9],[43] 3.50% [8],[9],[43] 3.50% [8],[9],[43] 3.50% [8],[9],[43] 3.50% [8],[9],[43] 6.50% [10],[13] 6.50% [10],[13] 6.50% [10],[13] 6.50% [10],[13] 6.50% [10],[13] 6.50% [10],[13]  
Rate, PIK 3.30% [8],[9],[43] 3.30% [8],[9],[43] 3.30% [8],[9],[43] 3.30% [8],[9],[43] 3.30% [8],[9],[43] 3.30% [8],[9],[43] 3.30% [8],[9],[43] 0.00% [10],[13] 0.00% [10],[13] 0.00% [10],[13] 0.00% [10],[13] 0.00% [10],[13] 0.00% [10],[13]  
Rate, Max PIK 3.30% [8],[9],[43] 3.30% [8],[9],[43] 3.30% [8],[9],[43] 3.30% [8],[9],[43] 3.30% [8],[9],[43] 3.30% [8],[9],[43] 3.30% [8],[9],[43] 3.50% [10],[13] 3.50% [10],[13] 3.50% [10],[13] 3.50% [10],[13] 3.50% [10],[13] 3.50% [10],[13]  
Floor 0.80% [8],[9],[43] 0.80% [8],[9],[43] 0.80% [8],[9],[43] 0.80% [8],[9],[43] 0.80% [8],[9],[43] 0.80% [8],[9],[43] 0.80% [8],[9],[43] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13] 0.80% [13]  
Principal Amount $ 59,100,000 [9],[15],[43]             $ 58,100,000 [13],[16]            
Amortized Cost 58,600,000 [9],[43]             57,500,000 [13]            
Fair Value $ 59,600,000 [1],[9],[43]             $ 57,500,000 [2],[13]            
Investment, Identifier [Axis]: Zendesk Inc, Software & Services 2                            
Rate, basis spread on variable rate 6.50% [8],[20] 6.50% [8],[20] 6.50% [8],[20] 6.50% [8],[20] 6.50% [8],[20] 6.50% [8],[20] 6.50% [8],[20] 6.50% [10],[19] 6.50% [10],[19] 6.50% [10],[19] 6.50% [10],[19] 6.50% [10],[19] 6.50% [10],[19]  
Rate, PIK 0.00% [8],[20] 0.00% [8],[20] 0.00% [8],[20] 0.00% [8],[20] 0.00% [8],[20] 0.00% [8],[20] 0.00% [8],[20] 0.00% [10],[19] 0.00% [10],[19] 0.00% [10],[19] 0.00% [10],[19] 0.00% [10],[19] 0.00% [10],[19]  
Rate, Max PIK 3.50% [8],[20] 3.50% [8],[20] 3.50% [8],[20] 3.50% [8],[20] 3.50% [8],[20] 3.50% [8],[20] 3.50% [8],[20] 3.50% [10],[19] 3.50% [10],[19] 3.50% [10],[19] 3.50% [10],[19] 3.50% [10],[19] 3.50% [10],[19]  
Floor 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19]  
Principal Amount $ 6,000,000.0 [15],[20]             $ 14,500,000 [16],[19]            
Amortized Cost 6,000,000.0 [20]             14,400,000 [19]            
Fair Value $ 6,000,000.0 [1],[20]             $ 14,400,000 [2],[19]            
Investment, Identifier [Axis]: Zendesk Inc, Software & Services 3                            
Rate, basis spread on variable rate 6.50% [8],[20] 6.50% [8],[20] 6.50% [8],[20] 6.50% [8],[20] 6.50% [8],[20] 6.50% [8],[20] 6.50% [8],[20] 6.50% [10],[19] 6.50% [10],[19] 6.50% [10],[19] 6.50% [10],[19] 6.50% [10],[19] 6.50% [10],[19]  
Rate, PIK 0.00% [8],[20] 0.00% [8],[20] 0.00% [8],[20] 0.00% [8],[20] 0.00% [8],[20] 0.00% [8],[20] 0.00% [8],[20] 0.00% [10],[19] 0.00% [10],[19] 0.00% [10],[19] 0.00% [10],[19] 0.00% [10],[19] 0.00% [10],[19]  
Rate, Max PIK 3.50% [8],[20] 3.50% [8],[20] 3.50% [8],[20] 3.50% [8],[20] 3.50% [8],[20] 3.50% [8],[20] 3.50% [8],[20] 3.50% [10],[19] 3.50% [10],[19] 3.50% [10],[19] 3.50% [10],[19] 3.50% [10],[19] 3.50% [10],[19]  
Floor 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [8],[20] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19] 0.80% [19]  
Principal Amount $ 14,500,000 [15],[20]             $ 6,000,000.0 [16],[19]            
Amortized Cost 14,400,000 [20]             6,000,000.0 [19]            
Fair Value 14,500,000 [1],[20]             5,900,000 [2],[19]            
Investment, Identifier [Axis]: athenahealth Inc, Preferred Stock                            
Fair Value $ 248,700,000             231,200,000            
Investment, Identifier [Axis]: athenahealth Inc, Preferred Stock, Equity/Other                            
Fair Value               $ 231,200,000           0
Investment, Identifier [Axis]: athenahealth Inc, Preferred Stock, Health Care Equipment & Services                            
Rate, PIK 10.80% [8],[9],[44] 10.80% [8],[9],[44] 10.80% [8],[9],[44] 10.80% [8],[9],[44] 10.80% [8],[9],[44] 10.80% [8],[9],[44] 10.80% [8],[9],[44] 10.80% [10],[13],[45] 10.80% [10],[13],[45] 10.80% [10],[13],[45] 10.80% [10],[13],[45] 10.80% [10],[13],[45] 10.80% [10],[13],[45]  
Rate, Max PIK 10.80% [8],[9],[44] 10.80% [8],[9],[44] 10.80% [8],[9],[44] 10.80% [8],[9],[44] 10.80% [8],[9],[44] 10.80% [8],[9],[44] 10.80% [8],[9],[44] 10.80% [10],[13],[45] 10.80% [10],[13],[45] 10.80% [10],[13],[45] 10.80% [10],[13],[45] 10.80% [10],[13],[45] 10.80% [10],[13],[45]  
Principal (in shares) | shares 267,493 [9],[44] 267,493 [9],[44] 267,493 [9],[44] 267,493 [9],[44] 267,493 [9],[44] 267,493 [9],[44] 267,493 [9],[44] 267,493,473 [13],[45] 267,493,473 [13],[45] 267,493,473 [13],[45] 267,493,473 [13],[45] 267,493,473 [13],[45] 267,493,473 [13],[45]  
Amortized Cost $ 262,200,000 [9],[44]             $ 262,200,000 [13],[45]            
Fair Value $ 248,700,000 [1],[9],[44]             231,200,000 [2],[13],[45]            
Investment, Identifier [Axis]: athenahealth Inc, Senior Secured Loans—First Lien -1                            
Fair Value               0           0
Investment, Identifier [Axis]: athenahealth Inc, Subordinated Debt                            
Fair Value               $ 0           $ 0
Investment, Identifier [Axis]: iNova Pharmaceuticals (Australia) Pty Limited, Pharmaceuticals, Biotechnology & Life Sciences                            
Rate, basis spread on variable rate 6.50% [8],[20],[34] 6.50% [8],[20],[34] 6.50% [8],[20],[34] 6.50% [8],[20],[34] 6.50% [8],[20],[34] 6.50% [8],[20],[34] 6.50% [8],[20],[34] 6.50% [10],[19],[29] 6.50% [10],[19],[29] 6.50% [10],[19],[29] 6.50% [10],[19],[29] 6.50% [10],[19],[29] 6.50% [10],[19],[29]  
Floor 0.80% [8],[20],[34] 0.80% [8],[20],[34] 0.80% [8],[20],[34] 0.80% [8],[20],[34] 0.80% [8],[20],[34] 0.80% [8],[20],[34] 0.80% [8],[20],[34] 0.80% [19],[29] 0.80% [19],[29] 0.80% [19],[29] 0.80% [19],[29] 0.80% [19],[29] 0.80% [19],[29]  
Principal Amount           $ 3.5 [15],[20],[34]             $ 3.5 [16],[19],[29]  
Amortized Cost $ 2,200,000 [20],[34]             $ 2,200,000 [19],[29]            
Fair Value $ 2,200,000 [1],[20],[34]             $ 2,200,000 [2],[19],[29]            
[1] See Note 8 for additional information regarding the fair value of the Company’s financial instruments
[2] Fair value determined by the Company’s board of directors (see Note 8).
[3] Security may be an obligation of one or more entities affiliated with the named company
[4] Security may be an obligation of one or more entities affiliated with the named company.
[5] Listed investments may be treated as debt for GAAP or tax purposes.
[6] Listed investments may be treated as debt for GAAP or tax purposes.
[7] The Company held this investment as of December 31, 2021 but it was not deemed to be an “affiliated person” of the portfolio company as of December 31, 2021. Transfers in or out have been presented at amortized cost.
[8] Certain variable rate securities in the Company’s portfolio bear interest at a rate determined by a publicly disclosed base rate plus a basis point spread. As of September 30, 2023, the three-month London Interbank Offered Rate, or LIBOR or “L”, was 5.66%, the Euro Interbank Offered Rate, or EURIBOR or “E”, was 3.95%, Canadian Dollar Offer Rate, or CDOR or “C”, was 5.51%, the Australian Bank Bill Swap Bid Rate, or BBSY or “B”, was 4.19%, the Reykjavik Interbank Offered Rate, or REIBOR or “R”, was 9.96%, the Stockholm Interbank Offered Rate, or STIBOR or “SR”, was 4.06%, the Sterling Interbank Offered Rate, or SONIA or “SA”, was 5.19%, the Secured Overnight Financing Rate, or SOFR or “SF”, was 5.40% and the U.S. Prime Lending Rate, or Prime or “P”, was 8.50%. PIK means paid-in-kind. PIK income accruals may be adjusted based on the performance of the underlying investment. Variable rate securities with no floor rate use the respective benchmark rate in all cases.
[9] Security or portion thereof is pledged as collateral supporting the amounts outstanding under the Senior Secured Revolving Credit Facility (see Note 9).
[10] Certain variable rate securities in the Company’s portfolio bear interest at a rate determined by a publicly disclosed base rate plus a basis point spread. As of December 31, 2022, the three-month London Interbank Offered Rate, or LIBOR or “L”, was 4.77%, the Euro Interbank Offered Rate, or EURIBOR or “E”, was 2.13%, Canadian Dollar Offer Rate, or CDOR “C”, was 4.94%, the Bank Bill Swap Bid Rate, or BBSY or “B”, was 3.32%, the Reykjavik Interbank Offered Rate, or REIBOR or “R”, was 6.55%, the Stockholm Interbank Offered Rate, or STIBOR or “SR”, was 2.70%, the Sterling Overnight Index Average, or SONIA or “SA”, was 3.43%, the Secured Overnight Financing Rate, or SOFR or “SF”, was 4.59%, and the U.S. Prime Lending Rate, or Prime or “P”, was 7.50%. PIK means paid-in-kind. PIK income accruals may be adjusted based on the fair value of the underlying investment.
[11] Security or portion thereof held within Darby Creek LLC and is pledged as collateral supporting the amounts outstanding under a revolving credit facility with Deutsche Bank AG, New York Branch (see Note 9).
[12] Security or portion thereof held within Dunlap Funding LLC and is pledged as collateral supporting the amounts outstanding under a revolving credit facility with Deutsche Bank AG, New York Branch (see Note 9).
[13] Security or portion thereof is pledged as collateral supporting the amounts outstanding under the Senior Secured Revolving Credit Facility (see Note 9).
[14] Security or portion thereof was held within CCT Tokyo Funding LLC and was pledged as collateral supporting the amounts outstanding under the revolving credit facility with Sumitomo Mitsui Banking Corporation (see Note 9).
[15] Denominated in U.S dollars unless otherwise noted.
[16] Denominated in U.S. dollars unless otherwise noted.
[17] Security or portion thereof held within CCT Tokyo Funding LLC and pledged as collateral supporting the amounts outstanding under the revolving credit facility with Sumitomo Mitsui Banking Corporation (see Note 9).
[18] Security or portion thereof held within Darby Creek LLC and is pledged as collateral supporting the amounts outstanding under a revolving credit facility with Deutsche Bank AG, New York Branch (see Note 9).
[19] Security is an unfunded commitment. Reflects the stated spread at the time of commitment, but may not be the actual rate received upon funding.
[20] Security is an unfunded commitment. Reflects the stated spread at the time of commitment, but may not be the actual rate received upon funding
[21] Security or portion thereof held within Ambler Funding LLC and is pledged as collateral supporting the amounts outstanding under the revolving credit facility with Ally Bank (see Note 9).
[22] Security or portion thereof held within Meadowbrook Run LLC and is pledged as collateral supporting the amounts outstanding under a revolving credit facility with Morgan Stanley Senior Funding, Inc. (see Note 9).
[23] Security or portion thereof held within Ambler Funding LLC and is pledged as collateral supporting the amounts outstanding under the revolving credit facility with Ally Bank (see Note 9).
[24] Security or portion thereof held within Meadowbrook Run LLC and is pledged as collateral supporting the amounts outstanding under a revolving credit facility with Morgan Stanley Senior Funding, Inc. (see Note 9).
[25] Asset is on non-accrual status.
[26] Security held within IC Arches Investments LLC, a wholly-owned subsidiary of the Company.
[27] Security held within IC II Arches Investments, LLC, a wholly-owned subsidiary of the Company.
[28] Security is non-income producing.
[29] The investment is not a qualifying asset under the Investment Company Act of 1940, as amended. A business development company may not acquire any asset other than qualifying assets, unless, at the time the acquisition is made, qualifying assets represent at least 70% of the company’s total assets. As of December 31, 2022, 75.3% of the Company’s total assets represented qualifying assets.
[30] Asset is on non-accrual status.
[31] Security held within IC Arches Investments, LLC, a wholly-owned subsidiary of the Company.
[32] Security held within IC II Arches Investments, LLC, a wholly-owned subsidiary of the Company.
[33] Security is non-income producing.
[34] The investment, or portion of the investment is not a qualifying asset under the Investment Company Act of 1940, as amended. A business development company may not acquire any asset other than qualifying assets, unless, at the time the acquisition is made, qualifying assets represent at least 70% of the company’s total assets. As of September 30, 2023, 73.8% of the Company’s total assets represented qualifying assets.
[35] Under the Investment Company Act of 1940, as amended, the Company generally is deemed to “control” a portfolio company if it owns more than 25% of the portfolio company’s voting securities or it has the power to exercise control over the management or policies of such portfolio company. As of September 30, 2023, the Company held investments in portfolio companies of which it is deemed to be an “affiliated person” and deemed to “control”. During the nine months ended September 30, 2023, the Company disposed of investments in portfolio companies of which it was deemed to be an “affiliated person” and deemed to “control”. The following table presents certain information with respect to investments in portfolio companies of which the Company was deemed to be an affiliated person and deemed to control as of September 30, 2023:
Portfolio Company
Fair Value at December 31, 2022
Gross Additions(1)
Gross Reductions(2)
Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation)
Fair Value at September 30, 2023
Interest Income(3)
PIK Income(3)
Fee Income(3)
Dividend and Other Income(3)
Senior Secured Loans—First Lien
Tekfor HoldCo (formerly Amtek Global Technology Pte Ltd)$3.9 $— $(40.1)$— $36.2 $— $— $— $— $— 
ATX Networks Corp 40.6 27.8 (2.4)— — 66.0 5.3 — 3.8 — 
Gracent LLC— 51.1 (23.1)(4.2)(0.2)23.6 0.7 1.1 — — 
HM Dunn Co Inc35.6 1.2 (0.5)— — 36.3 2.1 1.1 — — 
HM Dunn Co Inc— 1.0 — — — 1.0 — — — — 
NBG Home— 21.6 (14.4)2.9 — 10.1 0.6 0.8 1.0 — 
NBG Home— 30.7 — — (20.2)10.5 0.7 0.1 — — 
NBG Home— 69.9 (30.4)(0.8)(38.7)— — — — — 
NCI Inc28.1 2.3 0.2 — 0.5 31.1 — 2.3 — — 
Production Resource Group LLC152.5 14.8 (0.9)— (2.0)164.4 17.2 6.3 — — 
Production Resource Group LLC0.1 — — — — 0.1 — — — — 
Production Resource Group LLC68.1 2.7 (5.7)0.1 (1.4)63.8 5.8 1.5 — — 
Production Resource Group LLC31.3 4.1 (1.1)— — 34.3 2.7 0.8 — — 
Warren Resources Inc(4)
18.6 0.5 — — (0.4)18.7 2.4 0.1 — — 
Senior Secured Loans—Second Lien
Quoizel LLC (fka NBG Home)— 6.3 — — — 6.3 0.1 0.1 — — 
Quoizel LLC (fka NBG Home)— 6.6 — — — 6.6 0.1 0.1 — — 
Other Senior Secured Debt
JW Aluminum Co 78.1 0.1 — — (2.2)76.0 6.0 — — — 
Subordinated Debt
ATX Networks Corp21.9 10.8 — — 0.2 32.9 — 2.5 — — 
Hilding Anders— — — (99.4)99.4 — — — — — 
Hilding Anders— — — — — — (0.3)— — — 
Hilding Anders— — — (26.9)26.9 — (0.1)— — — 
Asset Based Finance
 801 5th Ave, Seattle, Structure Mezzanine 58.9 0.1 — — (4.4)54.6 3.7 1.3 — — 
Portfolio Company
Fair Value at December 31, 2022
Gross Additions(1)
Gross Reductions(2)
Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation)
Fair Value at September 30, 2023
Interest Income(3)
PIK Income(3)
Fee Income(3)
Dividend and Other Income(3)
 801 5th Ave, Seattle, Private Equity $6.3 $— $— $— $(6.3)$— $— $— $— $— 
 Avenue One PropCo, Private Equity 31.0 5.3 — — (0.7)35.6 — — — — 
 Avida Holding AB, Common Stock 42.6 5.3 — — (8.6)39.3 — — — — 
 Kilter Finance, Preferred Stock 99.5 0.3 — — (0.1)99.7 8.2 — — — 
 Kilter Finance, Private Equity 0.5 — — — — 0.5 — — — — 
 KKR Altitude II Offshore Aggregator LP, Partnership Interest44.4 4.6 (0.6)— 1.6 50.0 — — — 1.1 
 KKR Rocket Loans Aggregator LLC, Partnership Interest 4.3 9.9 (3.6)— (2.2)8.4 — — — — 
 My Community Homes PropCo 2, Private Equity 79.0 — (3.2)— 3.8 79.6 — — — — 
 Prime St LLC, Private Equity — — (0.1)— 0.1 — — — — — 
 Prime St LLC, Structured Mezzanine 43.5 0.1 — — (13.3)30.3 2.2 2.5 — — 
 Roemanu LLC (FKA Toorak Capital Partners LLC), Private Equity 261.2 0.1 — — (14.0)247.3 — — — 13.1 
Credit Opportunities Partners JV, LLC
Credit Opportunities Partners JV, LLC1,428.3 — — — (25.1)1,403.2 — — — 175.0 
Equity/Other
 Amtek Global Technology Pte Ltd, Common Stock — — — — — — — — — — 
 Amtek Global Technology Pte Ltd, Ordinary Shares — — — (30.7)30.7 — — — — — 
 Amtek Global Technology Pte Ltd, Private Equity — — — — — — — — — — 
 ATX Networks Corp, Common Stock 29.2 8.2 — — 1.6 39.0 — — — — 
 ATX Networks Corp, Class B-1 Common Stock 5.0 — — — — 5.0 — — — — 
 ATX Networks Corp, Class B-2 Common Stock 9.0 — — — — 9.0 — — — — 
 Australis Maritime II, Private Equity — 9.5 — — 0.4 9.9 — — — — 
Gracent LLC, Preferred Stock A— 8.0 — — (8.0)— — — — — 
Gracent LLC, Preferred Stock B— — — — — — — — — — 
Gracent LLC, Class A Common Stock— — — — — — — — — — 
Gracent LLC, Preferred Equity— 8.2 — — (1.6)6.6 — — — — 
 Hilding Anders, Class A Common Stock — — — (0.1)0.1 — — — — — 
 Hilding Anders, Class B Common Stock — — — — — — — — — — 
 Hilding Anders, Class C Common Stock — — — — — — — — — — 
 Hilding Anders, Equity Options — — — (15.0)15.0 — — — — — 
 HM Dunn Co Inc, Preferred Stock, Series A 16.9 — — — 7.4 24.3 — — — — 
 HM Dunn Co Inc, Preferred Stock, Series B — — — — — — — — — — 
 JW Aluminum Co, Common Stock 2.4 — — — — 2.4 — — — — 
 JW Aluminum Co, Preferred Stock 112.5 13.8 — — 21.9 148.2 — 14.0 — — 
 Quoizel LLC (fka NBG Home), Common Stock— 8.3 — — — 8.3 — — — — 
 NCI Inc, Class A-1 Common Stock — — — — — — — — — — 
 NCI Inc, Class B-1 Common Stock — — — — — — — — — — 
Portfolio Company
Fair Value at December 31, 2022
Gross Additions(1)
Gross Reductions(2)
Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation)
Fair Value at September 30, 2023
Interest Income(3)
PIK Income(3)
Fee Income(3)
Dividend and Other Income(3)
 NCI Inc, Class C Common Stock $20.2 $— $— $— $(0.9)$19.3 $— $— $— $— 
 NCI Inc, Class I-1 Common Stock — — — — — — — — — — 
 PRG III LLC, Preferred Stock, Series A PIK 105.7 — — — 19.1 124.8 — — — — 
 PRG III LLC, Preferred Stock, Series B PIK — — — — — — — — — — 
Quorum Health Corp, Trade Claim— 0.7 — — 0.3 1.0 — — — — 
Quorum Health Corp, Trade Claim— 0.2 — — — 0.2 — — — — 
Quorum Health Corp, Private Equity— 0.9 — — 0.6 1.5 — — — — 
 TDC LLP, Preferred Equity — 8.1 — — 0.2 8.3 0.3 — — — 
 TDC LLP, Preferred Equity — 2.0 — — (0.1)1.9 — — — — 
Warren Resources Inc, Common Stock29.2 — — — (14.8)14.4 — — — — 
Total$2,908.4 $345.1 $(125.9)$(174.1)$100.8 $3,054.3 $57.7 $34.6 $4.8 $189.2 
______________
(1)Gross additions include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and the movement of an existing portfolio company into this category from a different category.
(2)Gross reductions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and the movement of an existing portfolio company out of this category into a different category.
(3)Interest, PIK, fee and dividend income presented for the full nine months ended September 30, 2023.
[36] Under the Investment Company Act of 1940, as amended, the Company generally is deemed to “control” a portfolio company if it owns more than 25% of the portfolio company’s voting securities or it has the power to exercise control over the management or policies of such portfolio company. As of December 31, 2022, the Company held investments in one portfolio company of which it is deemed to be an “affiliated person” and deemed to “control”. During the year ended December 31, 2022, the Company disposed of investments in one portfolio of which it was deemed to be an “affiliated person” and deemed to “control”. The following table presents certain information with respect to investments in portfolio companies of which the Company was deemed to be an affiliated person and deemed to control for the year ended December 31, 2022:
Portfolio CompanyFair Value at December 31, 2021
Gross Additions(1)
Gross Reductions(2)
Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation)Fair Value at December 31, 2022
Interest Income(3)
PIK Income(3)
Fee Income(3)
Dividend Income(3)
Senior Secured Loans—First Lien
Amtek Global Technology Pte Ltd$34.8 $— $(24.3)$(4.3)$(2.3)$3.9 $— $— $— $— 
ATX Networks Corp46.8 0.4 (6.6)— — 40.6 3.2 1.0 — — 
HM Dunn Co Inc33.6 2.0 — — — 35.6 0.8 2.1 — — 
HM Dunn Co Inc2.0 — (2.0)— — — — — — — 
NCI Inc— 79.1 (21.9)(28.5)(0.6)28.1 6.5 0.4 — — 
One Call Care Management Inc(5)
5.0 — (4.7)— (0.3)— — — — — 
Production Resource Group LLC133.3 19.3 (0.3)— 0.2 152.5 12.9 8.0 — — 
Production Resource Group LLC0.1 — — — — 0.1 — — — — 
Portfolio CompanyFair Value at December 31, 2021
Gross Additions(1)
Gross Reductions(2)
Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation)Fair Value at December 31, 2022
Interest Income(3)
PIK Income(3)
Fee Income(3)
Dividend Income(3)
Production Resource Group LLC$64.4 $3.7 $(0.6)$— $0.6 $68.1 $6.4 $2.0 $— $— 
Production Resource Group LLC20.2 11.1 (0.3)— 0.3 31.3 — 0.9 — — 
Warren Resources Inc18.7 0.6 (0.2)— (0.5)18.6 2.5 0.2 — — 
Senior Secured Loans—Second Lien
Amtek Global Technology Pte Ltd— — — (39.1)39.1 — — — — — 
Other Senior Secured Debt
JW Aluminum Co81.0 0.2 — — (3.1)78.1 8.0 — — — 
One Call Care Management Inc(5)
23.5 — (21.6)— (1.9)— — — — — 
Subordinated Debt
ATX Networks Corp7.1 3.6 — — 11.2 21.9 1.6 1.5 — — 
Hilding Anders46.6 — — — (46.6)— — — — — 
Hilding Anders— — — — — — 0.3 — — — 
Hilding Anders— — — — — — 0.1 — — — 
Asset Based Finance
801 5th Ave, Seattle, Structure Mezzanine57.2 1.9 — — (0.2)58.9 4.7 1.7 — — 
801 5th Ave, Seattle, Private Equity23.1 — (0.1)— (16.7)6.3 — — — — 
Avenue One PropCo, Private Equity— 46.3 (16.2)— 0.9 31.0 — — — — 
Avida Holding AB, Common Stock52.3 — — — (9.7)42.6 — — — — 
Kilter Finance, Preferred Stock36.1 87.3 (24.0)0.7 (0.6)99.5 7.4 1.9 — — 
Kilter Finance, Private Equity0.5 — — — — 0.5 — — — — 
KKR Altitude II Offshore Aggregator LP, Partnership Interest— 44.4 — — 44.4 — — — — 
KKR Rocket Loans Aggregator LLC, Partnership Interest1.4 2.9 — — — 4.3 — — — 1.3 
My Community Homes SFR PropCo 2, Private Equity33.0 157.0 (105.7)— (5.3)79.0 — — — — 
Prime St LLC, Private Equity9.1 — (0.3)— (8.8)— — — — — 
Prime St LLC, Structured Mezzanine52.4 3.3 — — (12.2)43.5 3.2 3.1 — — 
Toorak Capital Funding LLC, Membership Interest1.7 — (1.7)(0.2)0.2 — — — — 0.3 
Roemanu LLC (FKA Toorak Capital Partners LLC), Private Equity199.3 78.3 — — (16.4)261.2 — — — 18.8 
Roemanu LLC (FKA Toorak Capital Partners LLC), Structured Mezzanine22.0 32.0 (54.0)— — — — 0.6 — — 
Credit Opportunities Partners JV, LLC
Credit Opportunities Partners JV, LLC1,396.2 175.0 — — (142.9)1,428.3 — — — 208.3 
Equity/Other
Amtek Global Technology Pte Ltd, Common Stock— — — — — — — — — — 
Amtek Global Technology Pte Ltd, Ordinary Shares— — — — — — — — — — 
Amtek Global Technology Pte Ltd, Private Equity— — — — — — — — — — 
ATX Networks Corp, Common Stock— 1.7 — — 27.5 29.2 — — — — 
ATX Networks Corp, Class B-1 Common Stock— 5.0 — — — 5.0 — — — — 
ATX Networks Corp, Class B-2 Common Stock— 4.0 — — 5.0 9.0 — — — — 
Hilding Anders, Class A Common Stock— — — — — — — — — — 
Portfolio CompanyFair Value at December 31, 2021
Gross Additions(1)
Gross Reductions(2)
Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation)Fair Value at December 31, 2022
Interest Income(3)
PIK Income(3)
Fee Income(3)
Dividend Income(3)
Hilding Anders, Class B Common Stock— — — — — — — — — — 
Hilding Anders, Class C Common Stock— — — — — — — — — — 
Hilding Anders, Equity Options— — — — — — — — — — 
HM Dunn Co Inc, Preferred Stock, Series A7.1 — — — 9.8 16.9 — — — — 
HM Dunn Co Inc, Preferred Stock, Series B— — — — — — — — — — 
JW Aluminum Co, Common Stock— — — — 2.4 2.4 — — — — 
JW Aluminum Co, Preferred Stock122.6 22.2 — — (32.3)112.5 0.6 19.7 — — 
NCI Inc, Class A-1 Common Stock(4)
— — — — — — — — — — 
NCI Inc, Class B-1 Common Stock(4)
— — — — — — — — — — 
NCI Inc, Class C Common Stock(4)
— 20.2 — — — 20.2 — — — — 
NCI Inc, Class I-1 Common Stock(4)
— — — — — — — — — — 
One Call Care Management Inc, Common Stock(5)
2.4 — (2.1)— (0.3)— — — — — 
One Call Care Management Inc, Preferred Stock A(5)
26.1 — (22.8)— (3.3)— — — — — 
One Call Care Management Inc, Preferred Stock B(5)
9.2 — (8.0)— (1.2)— — — — — 
PRG III LLC, Preferred Stock, Series A PIK17.4 — — — 88.3 105.7 — — — — 
PRG III LLC, Preferred Stock, Series B PIK— — — — — — — — — — 
Sound United LLC, Common Stock77.5 — (17.3)— (60.2)— — — — — 
Warren Resources Inc, Common Stock20.4 — — — 8.8 29.2 — — — — 
Total$2,684.1 $801.5 $(334.7)$(71.4)$(171.1)$2,908.4 $58.2 $43.1 $— $228.7 
______________
(1)Gross additions include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and the movement of an existing portfolio company into this category from a different category.
(2)Gross reductions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and the movement of an existing portfolio company out of this category into a different category.
(3)Interest, PIK, fee and dividend income presented for the full year ended December 31, 2022.
(4)The Company held this investment as of December 31, 2021 but it was not deemed to be in “control” of the portfolio company as of December 31, 2021. Transfers in or out have been presented at amortized cost.
(5)The Company held this investment as of December 31, 2022 but it was not deemed to be in “control” of the portfolio company as of December 31, 2022. Transfers in or out have been presented at amortized cost.
[37] Security or portion thereof held within Juniata River LLC and is pledged as collateral supporting the amounts outstanding under a term loan credit facility with JPMorgan Chase Bank, N.A. (see Note 9).
[38] Security or portion thereof held within Juniata River LLC and is pledged as collateral supporting the amounts outstanding under a term loan credit facility with JPMorgan Chase Bank, N.A. (see Note 9).
[39] Position or portion thereof unsettled as of December 31, 2022.
[40] Security is classified as Level 1 or Level 2 in the Company’s fair value hierarchy (see Note 8).
[41] Security is classified as Level 1 or 2 in the Company's fair value hierarchy (see Note 8).
[42] Security or portion thereof was held within FSK CLO as of December 31, 2022.
[43] Security or portion thereof held within FS KKR MM CLO 1 LLC (see Note 9).
[44] Under the Investment Company Act of 1940, as amended, the Company generally is deemed to be an “affiliated person” of a portfolio company if it owns 5% or more of the portfolio company’s voting securities and generally is deemed to “control” a portfolio company if it owns more than 25% of the portfolio company’s voting securities or it has the power to exercise control over the management or policies of such portfolio company. As of September 30, 2023, the Company held investments in portfolio companies of which it is deemed to be an “affiliated person” but is not deemed to “control”. The following table presents certain information with respect to investments in portfolio companies of which the Company was deemed to be an affiliated person as of September 30, 2023:
Portfolio Company
Fair Value at December 31, 2022
Gross Additions(1)
Gross Reductions(2)
Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation)
Fair Value at September 30, 2023
Interest Income(3)
PIK Income(3)
Fee Income(3)
Dividend and Other Income(3)
Senior Secured Loans—First Lien
Affordable Care Inc$53.1 $6.0 $(26.3)$(0.2)$1.3 $33.9 $3.6 $0.3 $0.4 $— 
Affordable Care Inc— 4.7 — — (0.3)4.4 0.1 — — — 
Belk Inc8.8 0.1 (5.7)0.7 9.8 13.7 0.2 — — — 
Belk Inc19.4 — — — (0.5)18.9 2.2 — — — 
Constellis Holdings LLC15.0 0.5 — — (0.4)15.1 1.8 — 0.1 — 
Galaxy Universal LLC— 7.5 — — — 7.5 0.6 — 0.5 — 
Galaxy Universal LLC— 88.1 (0.7)— (1.2)86.2 7.1 — — — 
Galaxy Universal LLC— 21.4 (3.2)— (0.3)17.9 1.4 — — — 
Sungard Availability Services Capital Inc(4)
0.5 — (5.8)— 5.3 — — — — — 
Sungard Availability Services Capital Inc(4)
2.0 — (2.0)— — — — — 0.1 — 
ThermaSys Corp8.6 — (5.1)(3.2)(0.3)— — — — — 
Senior Secured Loans—Second Lien
Belk Inc 3.3 — — — (3.3)— — — — — 
Constellis Holdings LLC 13.5 0.2 — — (4.2)9.5 1.8 — 0.1 — 
Sungard Availability Services Capital Inc(4)
— — — (13.5)13.5 — — — — — 
Asset Based Finance
Home Partners JV 2, Structured Mezzanine10.2 0.9 — — — 11.1 — 0.8 — — 
Home Partners JV 2, Private Equity 0.2 — — — — 0.2 — — — — 
Home Partners JV 2, Private Equity 5.0 — — — (1.0)4.0 — — — — 
Equity/Other
Affordable Care Inc, Preferred Stock 49.9 — — — (1.4)48.5 — 4.1 — — 
athenahealth Inc, Preferred Stock 231.2 — — — 17.5 248.7 — 21.8 — — 
Belk Inc, Common Stock — — — — — — — — — — 
Borden (New Dairy Opco), Common Stock 4.8 — (4.3)0.8 12.1 13.4 — — — — 
Constellis Holdings LLC, Private Equity 6.3 — — — (6.3)— — — — — 
Fronton BV, Common Stock 1.0 — — — 0.7 1.7 — — — — 
Galaxy Universal LLC, Common Stock— 35.4 — — (35.0)0.4 — — — — 
Galaxy Universal LLC, Trade Claim— 4.6 (1.8)— (1.8)1.0 — — — — 
Galaxy Universal LLC, Preferred Stock— 4.0 — — 1.1 5.1 — 0.1 — — 
Proserv Acquisition LLC, Class A Common Units 1.1 — — — 3.5 4.6 — — — — 
Proserv Acquisition LLC, Class A Preferred Units 9.5 — — — — 9.5 — — — — 
ThermaSys Corp, Common Stock — — — — — — — — — — 
ThermaSys Corp, Preferred Stock — — (0.2)(1.5)1.7 — — — — — 
Total$443.4 $173.4 $(55.1)$(16.9)$10.5 $555.3 $18.8 $27.1 $1.2 $— 
______________
(1)Gross additions include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and the movement of an existing portfolio company into this category from a different category.
(2)Gross reductions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and the movement of an existing portfolio company out of this category into a different category.
(3)Interest, PIK, fee and dividend income presented for the full nine months ended September 30, 2023.
(4)The Company held this investment as of September 30, 2023 but it was not deemed to be an “affiliated person” of the portfolio company as of September 30, 2023.
[45] Under the Investment Company Act of 1940, as amended, the Company generally is deemed to be an “affiliated person” of a portfolio company if it owns 5% or more of the portfolio company’s voting securities and generally is deemed to “control” a portfolio company if it owns more than 25% of the portfolio company’s voting securities or it has the power to exercise control over the management or policies of such portfolio company. As of December 31, 2022, the Company held investments in portfolio companies of which it is deemed to be an “affiliated person” but is not deemed to “control”. The following table presents certain information with respect to investments in portfolio companies of which the Company was deemed to be an affiliated person for the year ended December 31, 2022:
Portfolio CompanyFair Value at December 31, 2021
Gross Additions(1)
Gross Reductions(2)
Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation)Fair Value at December 31, 2022
Interest Income(3)
PIK Income(3)
Fee Income(3)
Dividend Income(3)
Senior Secured Loans—First Lien
Affordable Care Inc$— $— $— $— $— $— $— $— $— $— 
Affordable Care Inc59.9 16.2 (21.4)— (1.6)53.1 4.1 — 0.2 — 
athenahealth Inc— 6.8 (6.1)(0.7)— — 0.2 — 0.2 — 
Belk Inc49.2 4.7 (2.2)(0.2)(42.7)8.8 3.7 2.7 — — 
Belk Inc21.9 0.1 — — (2.6)19.4 2.2 — — — 
Borden (New Dairy Opco)9.0 — (9.0)0.6 (0.6)— 0.1 — 0.3 — 
Borden (New Dairy Opco)42.0 0.1 (42.0)1.7 (1.8)— 0.9 — 1.3 — 
Borden Dairy Co— — — (25.4)25.4 — — — — — 
Constellis Holdings LLC15.0 0.4 — — (0.4)15.0 1.8 — — — 
Portfolio CompanyFair Value at December 31, 2021
Gross Additions(1)
Gross Reductions(2)
Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation)Fair Value at December 31, 2022
Interest Income(3)
PIK Income(3)
Fee Income(3)
Dividend Income(3)
Fairway Group Holdings Corp$0.7 $— $— $(1.0)$0.3 $— $— $— $— $— 
Fairway Group Holdings Corp— — — — — — — — — — 
Micronics Filtration Holdings Inc51.0 5.7 (51.7)— (5.0)— 0.2 0.3 — — 
Petroplex Acidizing Inc9.7 — (16.7)(5.3)12.3 — — — — — 
Sorenson Communications LLC(4)
60.1 — (56.9)— (3.2)— — — — — 
Sungard Availability Services Capital Inc(4)
6.0 0.1 — — (5.6)0.5 — — — — 
Sungard Availability Services Capital Inc(4)
— 4.5 (2.5)— — 2.0 0.3 0.2 0.3 — 
ThermaSys Corp3.5 — — — 5.1 8.6 — — — — 
Senior Secured Loans—Second Lien
Belk Inc6.7 — — — (3.4)3.3 — — — — 
Constellis Holdings LLC12.0 0.3 — — 1.2 13.5 2.0 — — — 
Fairway Group Holdings Corp— — — — — — — — — — 
 Sungard Availability Services Capital Inc(4)
8.3 — (0.2)— (8.1)— — — — — 
Subordinated Debt
athenahealth Inc— 5.5 (4.7)(0.8)— — 0.1 — — — 
Asset Based Finance
Home Partners JV, Structured Mezzanine90.4 7.9 (98.1)4.6 (4.8)— 0.3 7.5 — — 
Home Partners JV, Private Equity9.4 — (11.8)6.4 (4.0)— — — — 0.7 
Home Partners JV, Common Stock80.6 — (101.0)53.4 (33.0)— — — — 4.3 
Home Partners JV 2, Structured Mezzanine3.5 6.7 — 0.1 (0.1)10.2 — 0.7 — — 
Home Partners JV 2, Private Equity0.1 0.1 — — — 0.2 — — — — 
Home Partners JV 2, Private Equity1.6 2.9 — — 0.5 5.0 — — — — 
Jet Edge International LLC, Preferred Stock16.8 — (30.1)9.2 4.1 — 0.7 — — — 
Jet Edge International LLC, Warrant4.5 — (13.5)13.5 (4.5)— — — — 1.5 
Jet Edge International LLC, Term Loan75.6 — (75.9)— 0.3 — 11.6 2.3 3.3 — 
Orchard Marine Limited, Class B Common Stock— — — (3.1)3.1 — — — — — 
Orchard Marine Limited, Series A Preferred Stock64.6 0.1 (66.0)3.9 (2.6)— — — — — 
Equity/Other
Affordable Care Inc, Common Stock52.1 — — — (2.2)49.9 — 5.5 — — 
athenahealth Inc, Preferred Stock— 311.3 (47.5)(1.6)(31.0)231.2 — 29.0— — 
Belk Inc, Common Stock— — — — — — — — — — 
Borden (New Dairy Opco), Common Stock7.7 — — — (2.9)4.8 — — — — 
Constellis Holdings LLC, Private Equity0.2 — — — 6.1 6.3 — — — — 
Fairway Group Holdings Corp, Common Stock— — — — — — — — — — 
Fronton BV, Common Stock1.4 — — — (0.4)1.0 — — — — 
Micronics Filtration Holdings Inc, Common Stock— — (0.1)(0.5)0.6 — — — — — 
Micronics Filtration Holdings Inc, Preferred Stock, Series A0.1 — — (0.6)0.5 — — — — — 
Micronics Filtration Holdings Inc, Preferred Stock, Series B0.4 — (0.4)0.2 (0.2)— — — — — 
Portfolio CompanyFair Value at December 31, 2021
Gross Additions(1)
Gross Reductions(2)
Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation)Fair Value at December 31, 2022
Interest Income(3)
PIK Income(3)
Fee Income(3)
Dividend Income(3)
Micronics Filtration Holdings Inc, Preferred Stock, Series B PIK$11.9 $— $(11.9)$11.9 $(11.9)$— $— $— $— $— 
Micronics Filtration Holdings Inc, Preferred Stock, Series C PIK6.2 — (6.2)6.2 (6.2)— — — — — 
Petroplex Acidizing Inc, Preferred Stock A— — — (4.9)4.9 — — — — — 
Petroplex Acidizing Inc, Warrant— — — — — — — — — — 
Proserv Acquisition LLC, Class A Common Units0.1 0.1 — — 0.9 1.1 — — — — 
Proserv Acquisition LLC, Class A Preferred Units9.3 — — — 0.2 9.5 — — — — 
 Sorenson Communications LLC, Common Stock(4)
67.5 — (65.4)22.9 (25.0)— — — — — 
 Sungard Availability Services Capital Inc, Common Stock(4)
— — — (6.9)6.9 — — — — — 
ThermaSys Corp, Common Stock— — — — — — — — — — 
ThermaSys Corp, Preferred Stock— — — — — — — — — — 
Total$859.0 $373.5 $(741.3)$83.6 $(131.4)$443.4 $28.2 $48.2 $5.6 $6.5 
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(1)Gross additions include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and the movement of an existing portfolio company into this category from a different category.
(2)Gross reductions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and the movement of an existing portfolio company out of this category into a different category.
(3)Interest, PIK, fee and dividend income presented for the full year ended December 31, 2022.
(4)The Company held this investment as of December 31, 2021 but it was not deemed to be an “affiliated person” of the portfolio company as of December 31, 2021. Transfers in or out have been presented at amortized cost.
[46] Security or portion thereof was held within CCT Dublin Funding Limited
[47] Security held within CCT Holdings II, LLC, a wholly-owned subsidiary of the Company
[48] Security held within CCT Holdings II, LLC, a wholly-owned subsidiary of the Company.
[49] Security held within IC American Energy Investments, Inc., a wholly-owned subsidiary of the Company.
[50] Security held within IC American Energy Investments, Inc., a wholly-owned subsidiary of the Company.
[51] Security held within FSIC II Investments, Inc., a wholly-owned subsidiary of the Company.
[52] Security held within FSIC II Investments, Inc., a wholly-owned subsidiary of the Company.
[53] Security or portion thereof held within Race Street Funding LLC. Security is available as collateral to support the amounts outstanding under the Senior Secured Revolving Credit Facility (see Note 9).
[54] Security or portion thereof held within Race Street Funding LLC. Security is available as collateral supporting the amounts outstanding under the Senior Secured Revolving Credit Facility (see Note 9).
[55] Security or portion thereof held within Cobbs Creek LLC and is pledged as collateral supporting the amounts outstanding under the senior secured revolving credit facility (see Note 9).
[56] Security held within FSIC Investments, Inc., a wholly-owned subsidiary of the Company.
[57] Security held within FSIC Investments, Inc., a wholly-owned subsidiary of the Company.
[58] Security or portion thereof held within Cobbs Creek LLC and is pledged as collateral supporting the amounts outstanding under the senior secured revolving credit facility (see Note 9).
[59] The Company held this investment as of December 31, 2021 but it was not deemed to be in “control” of the portfolio company as of December 31, 2021. Transfers in or out have been presented at amortized cost.
[60] The Company held this investment as of December 31, 2022 but it was not deemed to be in “control” of the portfolio company as of December 31, 2022. Transfers in or out have been presented at amortized cost.
[61] The Company held this investment as of September 30, 2023 but it was not deemed to be an “affiliated person” of the portfolio company as of September 30, 2023.