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Investment Portfolio - Credit Opportunities Partners JV, LLC Portfolio (Details)
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Sep. 30, 2022
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Dec. 31, 2021
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Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Percent of net assets [1] 220.60% 220.60% 220.60% 220.60% 220.60% 220.60% 220.60%            
Amortized Cost $ (16,677,700,000) [1]             $ (16,056,700,000) [2]          
Fair Value $ (15,791,800,000) [1]             $ (16,101,000,000)          
Liabilities in excess of other assets percentage [1] 120.60% 120.60% 120.60% 120.60% 120.60% 120.60% 120.60%            
Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Percent of net assets 216.30% 216.30% 216.30% 216.30% 216.30% 216.30% 216.30% 204.30% 204.30% 204.30% 204.30% 204.30% 204.30%
Amortized Cost $ (3,842,700,000)             $ (3,206,200,000)          
Fair Value (3,624,500,000)             (3,260,000,000)          
Foreign currency forward contracts $ 52,200,000             $ (6,700,000)          
Liabilities in excess of other assets percentage 3.10% 3.10% 3.10% 3.10% 3.10% 3.10% 3.10% (0.40%) (0.40%) (0.40%) (0.40%) (0.40%) (0.40%)
LIBOR                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 3.75% 3.75% 3.75% 3.75% 3.75% 3.75% 3.75% 0.21% 0.21% 0.21% 0.21% 0.21% 0.21%
LIBOR | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind 3.75% 3.75% 3.75% 3.75% 3.75% 3.75% 3.75% 0.21% 0.21% 0.21% 0.21% 0.21% 0.21%
EURIBOR                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 1.17% 1.17% 1.17% 1.17% 1.17% 1.17% 1.17% (0.57%) (0.57%) (0.57%) (0.57%) (0.57%) (0.57%)
EURIBOR | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind 1.17% 1.17% 1.17% 1.17% 1.17% 1.17% 1.17% (0.57%) (0.57%) (0.57%) (0.57%) (0.57%) (0.57%)
CDOR                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 4.20% 4.20% 4.20% 4.20% 4.20% 4.20% 4.20% 0.52% 0.52% 0.52% 0.52% 0.52% 0.52%
CDOR | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind 4.20% 4.20% 4.20% 4.20% 4.20% 4.20% 4.20% 0.52% 0.52% 0.52% 0.52% 0.52% 0.52%
BBSY                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 3.11% 3.11% 3.11% 3.11% 3.11% 3.11% 3.11% 0.12% 0.12% 0.12% 0.12% 0.12% 0.12%
BBSY | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind 3.11% 3.11% 3.11% 3.11% 3.11% 3.11% 3.11% 0.12% 0.12% 0.12% 0.12% 0.12% 0.12%
REIBOR                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.30% 6.30% 6.30% 6.30% 6.30% 6.30% 6.30% 2.65% 2.65% 2.65% 2.65% 2.65% 2.65%
REIBOR | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind 6.30% 6.30% 6.30% 6.30% 6.30% 6.30% 6.30% 2.65% 2.65% 2.65% 2.65% 2.65% 2.65%
STIBOR                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 1.73% 1.73% 1.73% 1.73% 1.73% 1.73% 1.73% (0.05%) (0.05%) (0.05%) (0.05%) (0.05%) (0.05%)
STIBOR | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind 1.73% 1.73% 1.73% 1.73% 1.73% 1.73% 1.73% (0.05%) (0.05%) (0.05%) (0.05%) (0.05%) (0.05%)
SONIA | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind 2.19% 2.19% 2.19% 2.19% 2.19% 2.19% 2.19% 0.19% 0.19% 0.19% 0.19% 0.19% 0.19%
SOFR | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind 3.59% 3.59% 3.59% 3.59% 3.59% 3.59% 3.59%            
Pime                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 3.25% 3.25% 3.25% 3.25% 3.25% 3.25%
Interest rate, paid in kind               3.25% 3.25% 3.25% 3.25% 3.25% 3.25%
Pime | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Senior Secured Loans - First Lien                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Percent of net assets 136.60% [1] 136.60% [1] 136.60% [1] 136.60% [1] 136.60% [1] 136.60% [1] 136.60% [1] 126.30% [2] 126.30% [2] 126.30% [2] 126.30% [2] 126.30% [2] 126.30% [2]
Amortized Cost $ (10,023,000,000)             $ (9,695,100,000)          
Fair Value $ (9,780,500,000) [3]             $ (9,765,000,000)          
Senior Secured Loans - First Lien | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Percent of net assets 151.00% 151.00% 151.00% 151.00% 151.00% 151.00% 151.00% 135.20% 135.20% 135.20% 135.20% 135.20% 135.20%
Amortized Cost $ (2,661,000,000)             $ (2,134,500,000)          
Fair Value (2,529,400,000)             (2,157,500,000)          
Funded - Senior Secured Loans -First Lien                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Amortized Cost (10,961,600,000)             (11,165,500,000)          
Fair Value (10,719,100,000) [3]             (11,236,100,000) [4]          
Funded - Senior Secured Loans -First Lien | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Amortized Cost (2,663,800,000)             (2,136,400,000)          
Fair Value (2,532,200,000)             (2,159,400,000)          
Unfunded - Senior Secured Loans - First Lien                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Amortized Cost (938,600,000)             (1,470,400,000)          
Fair Value (938,600,000) [3]             (1,470,400,000) [4]          
Unfunded - Senior Secured Loans - First Lien | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Amortized Cost (2,800,000)             (1,900,000)          
Fair Value $ (2,800,000)             $ (1,900,000)          
Senior Secured Loans—Second Lien                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Percent of net assets 17.40% [1] 17.40% [1] 17.40% [1] 17.40% [1] 17.40% [1] 17.40% [1] 17.40% [1] 20.10% [2] 20.10% [2] 20.10% [2] 20.10% [2] 20.10% [2] 20.10% [2]
Amortized Cost $ (1,357,400,000)             $ (1,564,400,000)          
Fair Value $ (1,244,500,000) [3]             $ (1,556,500,000) [4]          
Senior Secured Loans—Second Lien | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Percent of net assets 23.40% 23.40% 23.40% 23.40% 23.40% 23.40% 23.40% 31.50% 31.50% 31.50% 31.50% 31.50% 31.50%
Amortized Cost $ (452,500,000)             $ (491,300,000)          
Fair Value (393,200,000)             (502,400,000)          
Other Senior Secured Debt                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Amortized Cost (151,000,000)             (149,000,000)          
Fair Value $ (110,000,000)             $ (120,000,000)          
Other Senior Secured Debt | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Percent of net assets 1.30% 1.30% 1.30% 1.30% 1.30% 1.30% 1.30% 1.50% 1.50% 1.50% 1.50% 1.50% 1.50%
Amortized Cost $ (24,000,000.0)             $ (22,900,000)          
Fair Value $ (21,200,000)             $ (23,500,000)          
Subordinated Debt                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Percent of net assets 3.60% [1] 3.60% [1] 3.60% [1] 3.60% [1] 3.60% [1] 3.60% [1] 3.60% [1] 1.40% [2] 1.40% [2] 1.40% [2] 1.40% [2] 1.40% [2] 1.40% [2]
Amortized Cost $ (379,800,000)             $ (188,300,000)          
Fair Value $ (255,300,000) [3]             $ (111,300,000) [4]          
Subordinated Debt | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Percent of net assets 0.20% 0.20% 0.20% 0.20% 0.20% 0.20% 0.20%            
Amortized Cost $ (4,800,000)                        
Fair Value $ (4,400,000)                        
Asset Based Finance                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Percent of net assets 25.50% [1] 25.50% [1] 25.50% [1] 25.50% [1] 25.50% [1] 25.50% [1] 25.50% [1] 29.10% [2] 29.10% [2] 29.10% [2] 29.10% [2] 29.10% [2] 29.10% [2]
Amortized Cost $ (1,941,800,000)             $ (2,132,000,000)          
Fair Value $ (1,825,700,000) [3]             $ (2,245,000,000) [4]          
Asset Based Finance | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Percent of net assets 30.00% 30.00% 30.00% 30.00% 30.00% 30.00% 30.00% 31.00% 31.00% 31.00% 31.00% 31.00% 31.00%
Amortized Cost $ (511,600,000)             $ (473,600,000)          
Fair Value (502,300,000)             (494,500,000)          
Equity/Other                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Amortized Cost (1,253,000,000)             (932,000,000)          
Fair Value $ (1,109,000,000)             $ (907,000,000)          
Equity/Other | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Percent of net assets 10.40% 10.40% 10.40% 10.40% 10.40% 10.40% 10.40% 5.10% 5.10% 5.10% 5.10% 5.10% 5.10%
Amortized Cost $ (188,800,000)             $ (83,900,000)          
Fair Value $ (174,000,000.0)             $ (82,100,000)          
Investment, Identifier [Axis]: , Asset Based Finance,                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[6],[7],[8],[9] 15.00% 15.00% 15.00% 15.00% 15.00% 15.00% 15.00%            
Investment, Identifier [Axis]: , Asset Based Finance, | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[6],[7],[8],[9] 15.00% 15.00% 15.00% 15.00% 15.00% 15.00% 15.00%            
Investment, Identifier [Axis]: 3Pillar Global Inc, Senior Secured Loans - First Lien, Software & Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[10],[11],[12] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[10],[11],[12] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [6],[10],[11],[12],[13] $ 95,500,000                        
Amortized Cost [6],[11],[12] (94,700,000)                        
Fair Value [3],[6],[11],[12] $ (92,900,000)                        
Investment, Identifier [Axis]: 3Pillar Global Inc, Senior Secured Loans—First Lien, Revolving Credit Facility, Software & Services, November, 23 2026                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Base Rate Floor [15]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [15],[16]               $ 9,200,000          
Amortized Cost [15]               (9,200,000)          
Fair Value [4],[15]               $ (9,100,000)          
Investment, Identifier [Axis]: 3Pillar Global Inc, Senior Secured Loans—First Lien, Revolving Credit Facility, Software & Services, November, 23 2027 - 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[17],[18],[19]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Base Rate Floor [17],[18],[19]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [16],[17],[18],[19]               $ 96,300,000          
Amortized Cost [17],[18],[19]               (95,300,000)          
Fair Value [4],[17],[18],[19]               $ (95,300,000)          
Investment, Identifier [Axis]: 3Pillar Global Inc, Senior Secured Loans—First Lien, Revolving Credit Facility, Software & Services, November, 23 2027 - 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Base Rate Floor [15]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [15],[16]               $ 30,600,000          
Amortized Cost [15]               (30,600,000)          
Fair Value [4],[15]               (30,200,000)          
Investment, Identifier [Axis]: 3pillar Global Inc, Senior Secured Loans - First Lien, Software & Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Base Rate Floor [5],[8] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[13] $ 5,700,000                        
Amortized Cost [8] (5,700,000)                        
Fair Value [3],[8] $ (5,500,000)                        
Investment, Identifier [Axis]: 3pillar Global Inc, Senior Secured Loans - First Lien, Software & Services 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Base Rate Floor [5],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [13],[20] $ 9,200,000                        
Amortized Cost [20] (9,200,000)                        
Fair Value [3],[20] $ (8,900,000)                        
Investment, Identifier [Axis]: 3pillar Global Inc, Senior Secured Loans - First Lien, Software & Services 4                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Base Rate Floor [5],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [13],[20] $ 24,900,000                        
Amortized Cost [20] (24,900,000)                        
Fair Value [3],[20] $ (24,200,000)                        
Investment, Identifier [Axis]: 48Forty Solutions LLC | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount $ 19,400,000                        
Amortized Cost (19,200,000)                        
Fair Value $ (19,000,000.0)                        
Investment, Identifier [Axis]: 48Forty Solutions LLC, Senior Secured Loans - First Lien, Commercial & Professional Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[11],[12],[21],[22] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[8],[11],[12],[21],[22] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[11],[12],[13],[21],[22] $ 183,200,000                        
Amortized Cost [8],[11],[12],[21],[22] (181,500,000)                        
Fair Value [3],[8],[11],[12],[21],[22] $ (179,100,000)                        
Investment, Identifier [Axis]: 48Forty Solutions LLC, Senior Secured Loans - First Lien, Commercial & Professional Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13] $ 7,400,000                        
Amortized Cost [8] (7,400,000)                        
Fair Value [3],[8] $ (7,300,000)                        
Investment, Identifier [Axis]: 48Forty Solutions LLC, Senior Secured Loans - First Lien, Commercial & Professional Services 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[20] $ 3,200,000                        
Amortized Cost [20] (3,200,000)                        
Fair Value [3],[20] (3,100,000)                        
Investment, Identifier [Axis]: 5 Arch Income Fund 2 LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Principal amount [16],[23],[24],[25],[26],[27]               111,100,000          
Amortized Cost [23],[24],[25],[26],[27]               (81,300,000)          
Fair Value [4],[23],[24],[25],[26],[27]               $ (78,300,000)          
Investment, Identifier [Axis]: 5 Arch Income Fund 2 LLC, Senior Secured Loans - First Lien, Diversified Financials                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Principal amount [9],[13],[28],[29],[30],[31] 97,500,000                        
Amortized Cost [9],[28],[29],[30],[31] (71,400,000)                        
Fair Value [3],[9],[28],[29],[30],[31] $ (62,400,000)                        
Investment, Identifier [Axis]: 801 5th Ave, Seattle, Private Equity                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[27],[32],[33]               8,554,983 8,554,983 8,554,983 8,554,983 8,554,983 8,554,983
Amortized Cost [26],[27],[32],[33]               $ (14,100,000)          
Fair Value [4],[26],[27],[32],[33]               $ (23,100,000)          
Investment, Identifier [Axis]: 801 5th Ave, Seattle, Private Equity, Asset Based Finance, Real Estate                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[9],[31],[34] 8,554,983 8,554,983 8,554,983 8,554,983 8,554,983 8,554,983 8,554,983            
Amortized Cost [8],[9],[31],[34] $ (14,100,000)                        
Fair Value [3],[8],[9],[31],[34] $ (14,300,000)                        
Investment, Identifier [Axis]: 801 5th Ave, Seattle, Structure Mezzanine                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[27],[32],[33]               8.00% 8.00% 8.00% 8.00% 8.00% 8.00%
Interest rate, paid in kind [14],[27],[32],[33]               3.00% 3.00% 3.00% 3.00% 3.00% 3.00%
Principal amount [27],[32],[33]               $ 57,200,000          
Amortized Cost [27],[32],[33]               (55,100,000)          
Fair Value [4],[27],[32],[33]               $ (57,200,000)          
Investment, Identifier [Axis]: 801 5th Ave, Seattle, Structure Mezzanine | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[27],[32],[33]               3.00% 3.00% 3.00% 3.00% 3.00% 3.00%
Investment, Identifier [Axis]: 801 5th Ave, Seattle, Structure Mezzanine, Asset Based Finance, Real Estate                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9],[34] 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%            
Interest rate, paid in kind [5],[8],[9],[34] 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00%            
Principal amount [8],[9],[13],[34] $ 57,200,000                        
Amortized Cost [8],[9],[34] (55,300,000)                        
Fair Value [3],[8],[9],[34] $ (57,200,000)                        
Investment, Identifier [Axis]: 801 5th Ave, Seattle, Structure Mezzanine, Asset Based Finance, Real Estate | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[9],[34] 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00%            
Investment, Identifier [Axis]: ABB CONCISE Optical Group LLC | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               5.00% 5.00% 5.00% 5.00% 5.00% 5.00%
Base Rate Floor               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount               $ 16,200,000          
Amortized Cost               (14,500,000)          
Fair Value               (15,700,000)          
Investment, Identifier [Axis]: ATX Networks Corp                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Principal amount [16],[23],[26],[27],[32],[33],[35]               18,300,000          
Amortized Cost [23],[26],[27],[32],[33],[35]               (4,800,000)          
Fair Value [4],[23],[26],[27],[32],[33],[35]               $ (7,100,000)          
Investment, Identifier [Axis]: ATX Networks Corp | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[23],[26],[27],[32],[33],[35]               10.00% 10.00% 10.00% 10.00% 10.00% 10.00%
Investment, Identifier [Axis]: ATX Networks Corp 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[27],[32],[33],[35]               7.50% 7.50% 7.50% 7.50% 7.50% 7.50%
Base Rate Floor [27],[32],[33],[35]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[27],[32],[33],[35]               $ 46,800,000          
Amortized Cost [27],[32],[33],[35]               (46,800,000)          
Fair Value [4],[27],[32],[33],[35]               $ (46,800,000)          
Investment, Identifier [Axis]: ATX Networks Corp 1 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[27],[32],[33],[35]               7.50% 7.50% 7.50% 7.50% 7.50% 7.50%
Investment, Identifier [Axis]: ATX Networks Corp, Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[27],[32],[33],[35]               3,483 3,483 3,483 3,483 3,483 3,483
Amortized Cost [26],[27],[32],[33],[35]               $ 0          
Fair Value [4],[26],[27],[32],[33],[35]               $ 0          
Investment, Identifier [Axis]: ATX Networks Corp, Common Stock, Equity/Other, Capital Goods                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[9],[31],[34],[36],[37] 3,773 3,773 3,773 3,773 3,773 3,773 3,773            
Amortized Cost [8],[9],[31],[34],[36],[37] $ 0                        
Fair Value [3],[8],[9],[31],[34],[36],[37] $ 0                        
Investment, Identifier [Axis]: ATX Networks Corp, Senior Secured Loans - First Lien, Capital Goods                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9],[34],[37] 7.50% 7.50% 7.50% 7.50% 7.50% 7.50% 7.50%            
Base Rate Floor [5],[8],[9],[34],[37] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[9],[13],[34],[37] $ 41,100,000                        
Amortized Cost [8],[9],[34],[37] (41,100,000)                        
Fair Value [3],[8],[9],[34],[37] $ (41,100,000)                        
Investment, Identifier [Axis]: ATX Networks Corp, Subordinated Debt, Capital Goods                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[9],[34],[36],[37] 10.00% 10.00% 10.00% 10.00% 10.00% 10.00% 10.00%            
Principal amount [8],[9],[13],[34],[36],[37] $ 21,800,000                        
Amortized Cost [8],[9],[34],[36],[37] (8,100,000)                        
Fair Value [3],[8],[9],[34],[36],[37] $ (16,600,000)                        
Investment, Identifier [Axis]: ATX Networks Corp, Subordinated Debt, Capital Goods | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[9],[34],[36],[37] 10.00% 10.00% 10.00% 10.00% 10.00% 10.00% 10.00%            
Investment, Identifier [Axis]: AVF Parent LLC, Trade Claim                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33]               44,507 44,507 44,507 44,507 44,507 44,507
Amortized Cost [26],[33]               $ 0          
Fair Value [4],[26],[33]               $ 0          
Investment, Identifier [Axis]: AVF Parent LLC, Trade Claim, Equity/Other, Retailing                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[31] 44,507 44,507 44,507 44,507 44,507 44,507 44,507            
Amortized Cost [8],[31] $ 0                        
Fair Value [3],[8],[31] $ 0                        
Investment, Identifier [Axis]: Abaco Energy Technologies LLC, Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33]               3,055,556 3,055,556 3,055,556 3,055,556 3,055,556 3,055,556
Amortized Cost [26],[33]               $ (200,000)          
Fair Value [4],[26],[33]               $ (300,000)          
Investment, Identifier [Axis]: Abaco Energy Technologies LLC, Common Stock, Equity/Other, Energy                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[31] 3,055,556 3,055,556 3,055,556 3,055,556 3,055,556 3,055,556 3,055,556            
Amortized Cost [8],[31] $ (200,000)                        
Fair Value [3],[8],[31] $ (400,000)                        
Investment, Identifier [Axis]: Abaco Energy Technologies LLC, Preferred Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33]               12,734,481 12,734,481 12,734,481 12,734,481 12,734,481 12,734,481
Amortized Cost [26],[33]               $ (1,500,000)          
Fair Value [4],[26],[33]               $ (1,700,000)          
Investment, Identifier [Axis]: Abaco Energy Technologies LLC, Preferred Stock, Equity/Other, Energy                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[31] 12,734,481 12,734,481 12,734,481 12,734,481 12,734,481 12,734,481 12,734,481            
Amortized Cost [8],[31] $ (1,500,000)                        
Fair Value [3],[8],[31] $ (2,500,000)                        
Investment, Identifier [Axis]: Abacus JV, Private Equity                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [27],[33]               44,833,382 44,833,382 44,833,382 44,833,382 44,833,382 44,833,382
Amortized Cost [27],[33]               $ (43,800,000)          
Fair Value [4],[27],[33]               $ (48,100,000)          
Investment, Identifier [Axis]: Abacus JV, Private Equity | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares 31,400,804 31,400,804 31,400,804 31,400,804 31,400,804 31,400,804 31,400,804            
Amortized Cost $ (32,200,000)                        
Fair Value $ (33,400,000)                        
Investment, Identifier [Axis]: Abacus JV, Private Equity 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares               31,916,927 31,916,927 31,916,927 31,916,927 31,916,927 31,916,927
Amortized Cost               $ (32,700,000)          
Fair Value               $ (34,200,000)          
Investment, Identifier [Axis]: Abacus JV, Private Equity, Asset Based Finance, Insurance                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[9] 49,223,047 49,223,047 49,223,047 49,223,047 49,223,047 49,223,047 49,223,047            
Amortized Cost [8],[9] $ (48,200,000)                        
Fair Value [3],[8],[9] $ (52,300,000)                        
Investment, Identifier [Axis]: Accelerator Investments Aggregator LP, Private Equity                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[27],[33]               5,397,365 5,397,365 5,397,365 5,397,365 5,397,365 5,397,365
Amortized Cost [26],[27],[33]               $ (6,300,000)          
Fair Value [4],[26],[27],[33]               $ (4,700,000)          
Investment, Identifier [Axis]: Accelerator Investments Aggregator LP, Private Equity, Asset Based Finance, Diversified Financials                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[9],[31] 3,869,291 3,869,291 3,869,291 3,869,291 3,869,291 3,869,291 3,869,291            
Amortized Cost [8],[9],[31] $ (4,500,000)                        
Fair Value [3],[8],[9],[31] $ (3,000,000.0)                        
Investment, Identifier [Axis]: Access CIG LLC | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 7.75% 7.75% 7.75% 7.75% 7.75% 7.75% 7.75% 7.75% 7.75% 7.75% 7.75% 7.75% 7.75%
Base Rate Floor 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount $ 2,500,000             $ 2,500,000          
Amortized Cost (2,300,000)             (2,200,000)          
Fair Value $ (2,400,000)             $ (2,500,000)          
Investment, Identifier [Axis]: Accuride Corp                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[26],[38]               5.25% 5.25% 5.25% 5.25% 5.25% 5.25%
Base Rate Floor [18],[38]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[18],[38]               $ 9,000,000.0          
Amortized Cost [18],[38]               (8,100,000)          
Fair Value [4],[18],[38]               $ (8,700,000)          
Investment, Identifier [Axis]: Accuride Corp | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%            
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount $ 20,800,000                        
Amortized Cost (20,300,000)                        
Fair Value $ (18,100,000)                        
Investment, Identifier [Axis]: Accuride Corp 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               5.25% 5.25% 5.25% 5.25% 5.25% 5.25%
Base Rate Floor               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount               $ 21,000,000.0          
Amortized Cost               (20,300,000)          
Fair Value               $ (20,300,000)          
Investment, Identifier [Axis]: Accuride Corp, Senior Secured Loans - First Lien 1, Capital Goods                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[12],[39] 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%            
Base Rate Floor [5],[12],[39] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [12],[13],[39] $ 8,900,000                        
Amortized Cost [12],[39] (8,400,000)                        
Fair Value [3],[12],[39] $ (7,700,000)                        
Investment, Identifier [Axis]: Advanced Dermatology & Cosmetic Surgery ,Senior Secured Loans—First Lien, Health Care Equipment & Services, Maturing May, 7 2026                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 3,600,000          
Amortized Cost [15]               (3,600,000)          
Fair Value [4],[15]               $ (3,600,000)          
Investment, Identifier [Axis]: Advanced Dermatology & Cosmetic Surgery ,Senior Secured Loans—First Lien, Health Care Equipment & Services, Maturing May, 7 2027 - 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33],[40],[41]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor [33],[40],[41]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33],[40],[41]               $ 44,800,000          
Amortized Cost [33],[40],[41]               (42,900,000)          
Fair Value [4],[33],[40],[41]               $ (45,000,000.0)          
Investment, Identifier [Axis]: Advanced Dermatology & Cosmetic Surgery ,Senior Secured Loans—First Lien, Health Care Equipment & Services, Maturing May, 7 2027- 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 4,200,000          
Amortized Cost [15]               (4,200,000)          
Fair Value [4],[15]               $ (4,200,000)          
Investment, Identifier [Axis]: Advanced Dermatology & Cosmetic Surgery, Senior Secured Loans - First Lien, Health Care Equipment & Services 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[20] $ 3,600,000                        
Amortized Cost [20] (3,600,000)                        
Fair Value [3],[20] $ (3,500,000)                        
Investment, Identifier [Axis]: Advanced Dermatology & Cosmetic Surgery, Senior Secured Loans - First Lien, Health Care Equipment & Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[22],[42] 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%            
Base Rate Floor [5],[8],[22],[42] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13],[22],[42] $ 38,600,000                        
Amortized Cost [8],[22],[42] (36,900,000)                        
Fair Value [3],[8],[22],[42] $ (38,300,000)                        
Investment, Identifier [Axis]: Advanced Dermatology & Cosmetic Surgery, Senior Secured Loans - First Lien, Health Care Equipment & Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13] $ 7,900,000                        
Amortized Cost [8] (7,900,000)                        
Fair Value [3],[8] $ (7,800,000)                        
Investment, Identifier [Axis]: Advanced Dermatology & Cosmetic Surgery, Senior Secured Loans - First Lien, Health Care Equipment & Services 4                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[20] $ 2,200,000                        
Amortized Cost [20] (2,200,000)                        
Fair Value [3],[20] $ (2,200,000)                        
Investment, Identifier [Axis]: Advanced Lighting Technologies Inc, Senior Secured Loans -Second Lien, Materials                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[28],[31] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Interest rate, paid in kind [5],[8],[28],[31] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Base Rate Floor [5],[8],[28],[31] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13],[28],[31] $ 12,800,000                        
Amortized Cost [8],[28],[31] (10,500,000)                        
Fair Value [3],[8],[28],[31] $ (3,200,000)                        
Investment, Identifier [Axis]: Advanced Lighting Technologies Inc, Senior Secured Loans -Second Lien, Materials | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[28],[31] 16.00% 16.00% 16.00% 16.00% 16.00% 16.00% 16.00%            
Investment, Identifier [Axis]: Advanced Lighting Technologies Inc, Senior Secured Loans, Second Lien                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[23],[26],[33]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Base Rate Floor [23],[26],[33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[23],[26],[33]               $ 11,300,000          
Amortized Cost [23],[26],[33]               (10,500,000)          
Fair Value [4],[23],[26],[33]               $ (6,400,000)          
Investment, Identifier [Axis]: Advania Sverige 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.10% 6.10% 6.10% 6.10% 6.10% 6.10% 6.10%            
Interest rate, paid in kind 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Base Rate Floor 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount | kr   kr 588.0                      
Amortized Cost $ (66,600,000)                        
Fair Value $ (51,300,000)                        
Investment, Identifier [Axis]: Advania Sverige 1 | Maximum | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind 3.30% 3.30% 3.30% 3.30% 3.30% 3.30% 3.30%            
Investment, Identifier [Axis]: Advania Sverige 2 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.10% 6.10% 6.10% 6.10% 6.10% 6.10% 6.10%            
Interest rate, paid in kind 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Base Rate Floor 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount | kr     kr 1,644.9                    
Amortized Cost $ (12,800,000)                        
Fair Value $ (11,100,000)                        
Investment, Identifier [Axis]: Advania Sverige 2 | Maximum | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind 3.30% 3.30% 3.30% 3.30% 3.30% 3.30% 3.30%            
Investment, Identifier [Axis]: Advania Sverige AB 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               6.10% 6.10% 6.10% 6.10% 6.10% 6.10%
Interest rate, paid in kind               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Base Rate Floor               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount | kr                 kr 588.0        
Amortized Cost               $ (66,400,000)          
Fair Value               $ (64,300,000)          
Investment, Identifier [Axis]: Advania Sverige AB 1 | Maximum | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind               330.00% 330.00% 330.00% 330.00% 330.00% 330.00%
Investment, Identifier [Axis]: Advania Sverige AB 2 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               6.10% 6.10% 6.10% 6.10% 6.10% 6.10%
Interest rate, paid in kind               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Base Rate Floor               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount | kr                   kr 1,644.9      
Amortized Cost               $ (12,800,000)          
Fair Value               $ (12,500,000)          
Investment, Identifier [Axis]: Advania Sverige AB 2 | Maximum | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind               330.00% 330.00% 330.00% 330.00% 330.00% 330.00%
Investment, Identifier [Axis]: Advania Sverige AB, Senior Secured Loans - First Lien, Software & Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9] 6.10% 6.10% 6.10% 6.10% 6.10% 6.10% 6.10%            
Interest rate, paid in kind [5],[8],[9] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Base Rate Floor [5],[8],[9] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount | kr [8],[9],[13]   kr 933.6                      
Amortized Cost [8],[9] $ (105,900,000)                        
Fair Value [3],[8],[9] $ (81,200,000)                        
Investment, Identifier [Axis]: Advania Sverige AB, Senior Secured Loans - First Lien, Software & Services 1 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[9] 3.30% 3.30% 3.30% 3.30% 3.30% 3.30% 3.30%            
Investment, Identifier [Axis]: Advania Sverige AB, Senior Secured Loans - First Lien, Software & Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9] 6.10% 6.10% 6.10% 6.10% 6.10% 6.10% 6.10%            
Interest rate, paid in kind [5],[8],[9] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Base Rate Floor [5],[8],[9] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount | kr [8],[9],[13]     kr 1,345.8                    
Amortized Cost [8],[9] $ (10,100,000)                        
Fair Value [3],[8],[9] $ (9,100,000)                        
Investment, Identifier [Axis]: Advania Sverige AB, Senior Secured Loans - First Lien, Software & Services 2 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[9] 3.30% 3.30% 3.30% 3.30% 3.30% 3.30% 3.30%            
Investment, Identifier [Axis]: Advania Sverige AB, Senior Secured Loans—First Lien, Software & Services, April 28, 2028 - 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[27],[33]               6.10% 6.10% 6.10% 6.10% 6.10% 6.10%
Interest rate, paid in kind [14],[27],[33]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Base Rate Floor [27],[33]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount | kr [16],[27],[33]                 kr 629.4        
Amortized Cost [27],[33]               $ (67,900,000)          
Fair Value [4],[27],[33]               $ (68,900,000)          
Investment, Identifier [Axis]: Advania Sverige AB, Senior Secured Loans—First Lien, Software & Services, April 28, 2028 - 1 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[27],[33]               3.30% 3.30% 3.30% 3.30% 3.30% 3.30%
Investment, Identifier [Axis]: Advania Sverige AB, Senior Secured Loans—First Lien, Software & Services, April 28, 2028 -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[27],[33]               6.10% 6.10% 6.10% 6.10% 6.10% 6.10%
Interest rate, paid in kind [14],[27],[33]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Base Rate Floor [27],[33]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount | kr [16],[27],[33]                   kr 1,345.8      
Amortized Cost [27],[33]               $ (10,000,000.0)          
Fair Value [4],[27],[33]               $ (10,300,000)          
Investment, Identifier [Axis]: Advania Sverige AB, Senior Secured Loans—First Lien, Software & Services, April 28, 2028 -2 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[27],[33]               3.30% 3.30% 3.30% 3.30% 3.30% 3.30%
Investment, Identifier [Axis]: Advania Sverige AB, Senior Secured Loans—First Lien, Software & Services, April 28, 2028 -3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15],[27]               6.10% 6.10% 6.10% 6.10% 6.10% 6.10%
Interest rate, paid in kind [14],[15],[27]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Base Rate Floor [15],[27]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount | kr [15],[16],[27]                 kr 304.1        
Amortized Cost [15],[27]               $ (37,500,000)          
Fair Value [4],[15],[27]               $ (37,200,000)          
Investment, Identifier [Axis]: Advania Sverige AB, Senior Secured Loans—First Lien, Software & Services, April 28, 2028 -3 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[15],[27]               3.30% 3.30% 3.30% 3.30% 3.30% 3.30%
Investment, Identifier [Axis]: Affordable Care Inc | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Interest rate, paid in kind 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Base Rate Floor 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount $ 76,300,000             $ 55,900,000          
Amortized Cost (76,000,000.0)             (55,600,000)          
Fair Value $ (75,600,000)             $ (55,600,000)          
Investment, Identifier [Axis]: Affordable Care Inc | Maximum | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind 1.30% 1.30% 1.30% 1.30% 1.30% 1.30% 1.30% 130.00% 130.00% 130.00% 130.00% 130.00% 130.00%
Investment, Identifier [Axis]: Affordable Care Inc, Preferred Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[33],[43]               11.80% 11.80% 11.80% 11.80% 11.80% 11.80%
Number of Shares | shares [33],[43]               49,073,000 49,073,000 49,073,000 49,073,000 49,073,000 49,073,000
Amortized Cost [33],[43]               $ (48,100,000)          
Fair Value [4],[33],[43]               $ (52,100,000)          
Investment, Identifier [Axis]: Affordable Care Inc, Preferred Stock | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[33],[43]               11.80% 11.80% 11.80% 11.80% 11.80% 11.80%
Investment, Identifier [Axis]: Affordable Care Inc, Preferred Stock, Equity/Other, Health Care Equipment & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[44] 11.80% 11.80% 11.80% 11.80% 11.80% 11.80% 11.80%            
Number of Shares | shares [8],[44] 49,073,000 49,073,000 49,073,000 49,073,000 49,073,000 49,073,000 49,073,000            
Amortized Cost [8],[44] $ (48,100,000)                        
Fair Value [3],[8],[44] $ (50,000,000.0)                        
Investment, Identifier [Axis]: Affordable Care Inc, Preferred Stock, Equity/Other, Health Care Equipment & Services | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[44] 11.80% 11.80% 11.80% 11.80% 11.80% 11.80% 11.80%            
Investment, Identifier [Axis]: Affordable Care Inc, Senior Secured Loans - First Lien, Health Care Equipment & Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[42],[44] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Interest rate, paid in kind [5],[8],[42],[44] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Base Rate Floor [5],[8],[42],[44] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[13],[42],[44] $ 38,800,000                        
Amortized Cost [8],[42],[44] (38,400,000)                        
Fair Value [3],[8],[42],[44] $ (38,300,000)                        
Investment, Identifier [Axis]: Affordable Care Inc, Senior Secured Loans - First Lien, Health Care Equipment & Services 1 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[42],[44] 1.30% 1.30% 1.30% 1.30% 1.30% 1.30% 1.30%            
Investment, Identifier [Axis]: Affordable Care Inc, Senior Secured Loans - First Lien, Health Care Equipment & Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[44] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Interest rate, paid in kind [5],[8],[44] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Base Rate Floor [5],[8],[44] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[13],[44] $ 10,300,000                        
Amortized Cost [8],[44] (10,300,000)                        
Fair Value [3],[8],[44] $ (10,200,000)                        
Investment, Identifier [Axis]: Affordable Care Inc, Senior Secured Loans - First Lien, Health Care Equipment & Services 2 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[44] 1.30% 1.30% 1.30% 1.30% 1.30% 1.30% 1.30%            
Investment, Identifier [Axis]: Affordable Care Inc, Senior Secured Loans - First Lien, Health Care Equipment & Services 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20],[44] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Interest rate, paid in kind [5],[20],[44] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Base Rate Floor [5],[20],[44] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [13],[20],[44] $ 12,800,000                        
Amortized Cost [20],[44] (12,800,000)                        
Fair Value [3],[20],[44] $ (12,700,000)                        
Investment, Identifier [Axis]: Affordable Care Inc, Senior Secured Loans - First Lien, Health Care Equipment & Services 3 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[20],[44] 1.30% 1.30% 1.30% 1.30% 1.30% 1.30% 1.30%            
Investment, Identifier [Axis]: Affordable Care Inc, Senior Secured Loans - First Lien, Health Care Equipment & Services 4                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Base Rate Floor [5],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [13],[20] $ 33,200,000                        
Amortized Cost [20] (33,200,000)                        
Fair Value [3],[20] $ (32,800,000)                        
Investment, Identifier [Axis]: Affordable Care Inc, Senior Secured Loans—First Lien, Health Care Equipment & Services, Maturing August 2, 2027                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15],[43]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Interest rate, paid in kind [14],[15],[43]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Base Rate Floor [15],[43]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [15],[16],[43]               $ 12,800,000          
Amortized Cost [15],[43]               (12,800,000)          
Fair Value [4],[15],[43]               $ (12,800,000)          
Investment, Identifier [Axis]: Affordable Care Inc, Senior Secured Loans—First Lien, Health Care Equipment & Services, Maturing August 2, 2027 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[15],[43]               1.30% 1.30% 1.30% 1.30% 1.30% 1.30%
Investment, Identifier [Axis]: Affordable Care Inc, Senior Secured Loans—First Lien, Health Care Equipment & Services, Maturing August 2, 2028 -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33],[43]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Interest rate, paid in kind [14],[33],[43]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Base Rate Floor [33],[43]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [16],[33],[43]               $ 60,400,000          
Amortized Cost [33],[43]               (59,900,000)          
Fair Value [4],[33],[43]               $ (60,100,000)          
Investment, Identifier [Axis]: Affordable Care Inc, Senior Secured Loans—First Lien, Health Care Equipment & Services, Maturing August 2, 2028 -1 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[33],[43]               1.30% 1.30% 1.30% 1.30% 1.30% 1.30%
Investment, Identifier [Axis]: Affordable Care Inc, Senior Secured Loans—First Lien, Health Care Equipment & Services, Maturing August 2, 2028 -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15],[43]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Interest rate, paid in kind [14],[15],[43]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Base Rate Floor [15],[43]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [15],[16],[43]               $ 43,100,000          
Amortized Cost [15],[43]               (43,100,000)          
Fair Value [4],[15],[43]               $ (42,900,000)          
Investment, Identifier [Axis]: Affordable Care Inc, Senior Secured Loans—First Lien, Health Care Equipment & Services, Maturing August 2, 2028 -2 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[15],[43]               1.30% 1.30% 1.30% 1.30% 1.30% 1.30%
Investment, Identifier [Axis]: Alacrity Solutions Group LLC | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%            
Base Rate Floor 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount $ 40,600,000                        
Amortized Cost (39,900,000)                        
Fair Value $ (39,600,000)                        
Investment, Identifier [Axis]: Alacrity Solutions Group LLC, Senior Secured Loans—First Lien, Insurance, Maturing December 22, 2027 -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               5.25% 5.25% 5.25% 5.25% 5.25% 5.25%
Base Rate Floor [33]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [16],[33]               $ 1,100,000          
Amortized Cost [33]               (900,000)          
Fair Value [4],[33]               $ (1,100,000)          
Investment, Identifier [Axis]: Alacrity Solutions Group LLC, Senior Secured Loans—First Lien, Insurance, Maturing December 22, 2027-2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               5.25% 5.25% 5.25% 5.25% 5.25% 5.25%
Base Rate Floor [15]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [15],[16]               $ 9,700,000          
Amortized Cost [15]               (9,700,000)          
Fair Value [4],[15]               $ (9,500,000)          
Investment, Identifier [Axis]: Alacrity Solutions Group LLC, Senior Secured Loans—First Lien, Insurance, Maturing December 22, 2028                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               5.25% 5.25% 5.25% 5.25% 5.25% 5.25%
Base Rate Floor [33]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [16],[33]               $ 69,200,000          
Amortized Cost [33]               (68,200,000)          
Fair Value [4],[33]               $ (68,200,000)          
Investment, Identifier [Axis]: Alacrity Solutions Group LLC, , Senior Secured Loans - First Lien, Insurance 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%            
Base Rate Floor [5],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [13],[20] $ 7,700,000                        
Amortized Cost [20] (7,700,000)                        
Fair Value [3],[20] $ (7,400,000)                        
Investment, Identifier [Axis]: Alacrity Solutions Group LLC, Senior Secured Loans - First Lien, Insurance 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%            
Base Rate Floor [5],[8] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[13] $ 3,100,000                        
Amortized Cost [8] (3,000,000.0)                        
Fair Value [3],[8] $ (3,000,000.0)                        
Investment, Identifier [Axis]: Alacrity Solutions Group LLC, Senior Secured Loans - First Lien, Insurance 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%            
Base Rate Floor [5],[8] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[13] $ 28,400,000                        
Amortized Cost [8] (28,000,000.0)                        
Fair Value [3],[8] $ (27,600,000)                        
Investment, Identifier [Axis]: Alera Group Intermediate Holdings Inc | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Base Rate Floor 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount $ 32,300,000             $ 20,200,000          
Amortized Cost (31,900,000)             (20,000,000.0)          
Fair Value $ (31,100,000)             $ (20,000,000.0)          
Investment, Identifier [Axis]: Alera Group Intermediate Holdings Inc, Alacrity Solutions Group LLC, Senior Secured Loans—First Lien, Insurance, Maturing October 2, 2028 -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Base Rate Floor [33]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [16],[33]               $ 21,400,000          
Amortized Cost [33]               (21,200,000)          
Fair Value [4],[33]               $ (21,200,000)          
Investment, Identifier [Axis]: Alera Group Intermediate Holdings Inc, Alacrity Solutions Group LLC, Senior Secured Loans—First Lien, Insurance, Maturing October 2, 2028 -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Base Rate Floor [15]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [15],[16]               $ 22,900,000          
Amortized Cost [15]               (22,900,000)          
Fair Value [4],[15]               $ (22,700,000)          
Investment, Identifier [Axis]: Alera Group Intermediate Holdings Inc, Senior Secured Loans - First Lien, Insurance 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Base Rate Floor [5],[8] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[13] $ 9,200,000                        
Amortized Cost [8] (9,100,000)                        
Fair Value [3],[8] $ (8,800,000)                        
Investment, Identifier [Axis]: Alera Group Intermediate Holdings Inc, Senior Secured Loans - First Lien, Insurance 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Base Rate Floor [5],[8] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[13] $ 17,000,000.0                        
Amortized Cost [8] (17,000,000.0)                        
Fair Value [3],[8] $ (16,400,000)                        
Investment, Identifier [Axis]: Alera Group Intermediate Holdings Inc, Senior Secured Loans - First Lien, Insurance 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Base Rate Floor [5],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [13],[20] $ 5,600,000                        
Amortized Cost [20] (5,600,000)                        
Fair Value [3],[20] $ (5,400,000)                        
Investment, Identifier [Axis]: Alstom SA | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Interest rate, paid in kind 2.50% 2.50% 2.50% 2.50% 2.50% 2.50% 2.50% 250.00% 250.00% 250.00% 250.00% 250.00% 250.00%
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount $ 6,200,000             $ 6,100,000          
Amortized Cost (5,700,000)             (5,300,000)          
Fair Value $ (3,500,000)             $ (5,000,000.0)          
Investment, Identifier [Axis]: Alstom SA | Maximum | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind 2.50% 2.50% 2.50% 2.50% 2.50% 2.50% 2.50% 250.00% 250.00% 250.00% 250.00% 250.00% 250.00%
Investment, Identifier [Axis]: Altavair AirFinance, Private Equity                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [27],[33]               94,679,609 94,679,609 94,679,609 94,679,609 94,679,609 94,679,609
Amortized Cost [27],[33]               $ (95,600,000)          
Fair Value [4],[27],[33]               $ (114,300,000)          
Investment, Identifier [Axis]: Altavair AirFinance, Private Equity | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares 36,500,000 36,500,000 36,500,000 36,500,000 36,500,000 36,500,000 36,500,000            
Amortized Cost $ (43,000,000.0)                        
Fair Value $ (41,500,000)                        
Investment, Identifier [Axis]: Altavair AirFinance, Private Equity 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares               36,500,000 36,500,000 36,500,000 36,500,000 36,500,000 36,500,000
Amortized Cost               $ (43,000,000.0)          
Fair Value               $ (44,100,000)          
Investment, Identifier [Axis]: Altavair AirFinance, Private Equity, Asset Based Finance, Capital Goods                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[9] 118,783,852 118,783,852 118,783,852 118,783,852 118,783,852 118,783,852 118,783,852            
Amortized Cost [8],[9] $ (119,700,000)                        
Fair Value [3],[8],[9] $ (135,100,000)                        
Investment, Identifier [Axis]: American Airlines Group Inc | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 1.75% 1.75% 1.75% 1.75% 1.75% 1.75% 1.75%            
Base Rate Floor 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount $ 2,500,000                        
Amortized Cost (2,300,000)                        
Fair Value $ (2,300,000)                        
Investment, Identifier [Axis]: American Vision Partners | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount $ 19,600,000                        
Amortized Cost (19,400,000)                        
Fair Value $ (19,100,000)                        
Investment, Identifier [Axis]: American Vision Partners, Private Equity                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33]               2,450,230 2,450,230 2,450,230 2,450,230 2,450,230 2,450,230
Amortized Cost [26],[33]               $ (2,500,000)          
Fair Value [4],[26],[33]               $ (2,400,000)          
Investment, Identifier [Axis]: American Vision Partners, Private Equity, Equity/Other, Health Care Equipment & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[31] 2,450,230 2,450,230 2,450,230 2,450,230 2,450,230 2,450,230 2,450,230            
Amortized Cost [8],[31] $ (2,500,000)                        
Fair Value [3],[8],[31] $ (2,000,000.0)                        
Investment, Identifier [Axis]: American Vision Partners, Senior Secured Loans - First Lien, Health Care Equipment & Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[10] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[8],[10] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[10],[13] $ 74,400,000                        
Amortized Cost [8],[10] (73,800,000)                        
Fair Value [3],[8],[10] $ (72,600,000)                        
Investment, Identifier [Axis]: American Vision Partners, Senior Secured Loans - First Lien, Health Care Equipment & Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[8] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[13] $ 38,800,000                        
Amortized Cost [8] (38,800,000)                        
Fair Value [3],[8] $ (37,900,000)                        
Investment, Identifier [Axis]: American Vision Partners, Senior Secured Loans—First Lien, Health Care Equipment & Services, Maturing September 30, 2026                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor [15]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [15],[16]               $ 7,800,000          
Amortized Cost [15]               (7,800,000)          
Fair Value [4],[15]               $ (7,700,000)          
Investment, Identifier [Axis]: American Vision Partners, Senior Secured Loans—First Lien, Health Care Equipment & Services, Maturing September 30, 2027 -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[19],[33]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor [19],[33]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [16],[19],[33]               $ 94,700,000          
Amortized Cost [19],[33]               (93,800,000)          
Fair Value [4],[19],[33]               $ (94,300,000)          
Investment, Identifier [Axis]: American Vision Partners, Senior Secured Loans—First Lien, Health Care Equipment & Services, Maturing September 30, 2027 -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor [15]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [15],[16]               $ 38,900,000          
Amortized Cost [15]               (38,900,000)          
Fair Value [4],[15]               $ (38,700,000)          
Investment, Identifier [Axis]: American Vision Partners,, Senior Secured Loans - First Lien, Health Care Equipment & Services 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [13],[20] $ 7,800,000                        
Amortized Cost [20] (7,800,000)                        
Fair Value [3],[20] $ (7,600,000)                        
Investment, Identifier [Axis]: Amerivet Partners Management Inc, Preferred Stock, Equity/Other, Health Care Equipment & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8] 11.50% 11.50% 11.50% 11.50% 11.50% 11.50% 11.50%            
Number of Shares | shares [8] 12,702,290 12,702,290 12,702,290 12,702,290 12,702,290 12,702,290 12,702,290            
Amortized Cost [8] $ (12,300,000)                        
Fair Value [3],[8] $ (12,100,000)                        
Investment, Identifier [Axis]: Amerivet Partners Management Inc, Preferred Stock, Equity/Other, Health Care Equipment & Services | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8] 11.50% 11.50% 11.50% 11.50% 11.50% 11.50% 11.50%            
Investment, Identifier [Axis]: Amerivet Partners Management Inc, Senior Secured Loans - First Lien, Health Care Equipment & Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[8] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[13] $ 800,000                        
Amortized Cost [8] (800,000)                        
Fair Value [3],[8] $ (800,000)                        
Investment, Identifier [Axis]: Amerivet Partners Management Inc, Senior Secured Loans - First Lien, Health Care Equipment & Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[8] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount | € [8],[13]       € 101.5                  
Amortized Cost [8] $ (100,600,000)                        
Fair Value [3],[8] $ (98,400,000)                        
Investment, Identifier [Axis]: Amerivet Partners Management Inc, Senior Secured Loans - First Lien, Health Care Equipment & Services 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount | € [13],[20]       € 7.6                  
Amortized Cost [20] $ (7,600,000)                        
Fair Value [3],[20] $ (7,400,000)                        
Investment, Identifier [Axis]: Amerivet Partners Management Inc, Senior Secured Loans - First Lien, Health Care Equipment & Services 4                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [13],[20] $ 61,400,000                        
Amortized Cost [20] (61,400,000)                        
Fair Value [3],[20] $ (59,600,000)                        
Investment, Identifier [Axis]: Ammeraal Beltech Holding BV                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[27],[33],[35],[45]               7.75% 7.75% 7.75% 7.75% 7.75% 7.75%
Base Rate Floor [27],[33],[35],[45]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount [16],[27],[33],[35],[45]               $ 44,900,000          
Amortized Cost [27],[33],[35],[45]               (40,800,000)          
Fair Value [4],[27],[33],[35],[45]               $ (44,300,000)          
Investment, Identifier [Axis]: Ammeraal Beltech Holding BV | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 3.75% 3.75% 3.75% 3.75% 3.75% 3.75% 3.75%            
Base Rate Floor 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount | €       € 4.8                  
Amortized Cost $ (4,800,000)                        
Fair Value $ (4,100,000)                        
Investment, Identifier [Axis]: Ammeraal Beltech Holding BV 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 7.75% 7.75% 7.75% 7.75% 7.75% 7.75% 7.75% 7.75% 7.75% 7.75% 7.75% 7.75% 7.75%
Base Rate Floor 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount $ 42,800,000             $ 81,500,000          
Amortized Cost (42,000,000.0)             (79,800,000)          
Fair Value $ (42,000,000.0)             $ (80,300,000)          
Investment, Identifier [Axis]: Ammeraal Beltech Holding BV, Senior Secured Loans -Second Lien, Capital Goods                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9],[21],[37] 7.75% 7.75% 7.75% 7.75% 7.75% 7.75% 7.75%            
Base Rate Floor [5],[8],[9],[21],[37] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount [8],[9],[13],[21],[37] $ 23,600,000                        
Amortized Cost [8],[9],[21],[37] (21,700,000)                        
Fair Value [3],[8],[9],[21],[37] $ (23,200,000)                        
Investment, Identifier [Axis]: Ammeraal Beltech Holding BV, Senior Secured Loans, First Lien | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               3.50% 3.50% 3.50% 3.50% 3.50% 3.50%
Base Rate Floor               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount | €                     € 4.8    
Amortized Cost               $ (4,700,000)          
Fair Value               $ (5,400,000)          
Investment, Identifier [Axis]: Amtek Global Technology Pte Ltd                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[23],[26],[27],[32],[33]               5.00% 5.00% 5.00% 5.00% 5.00% 5.00%
Base Rate Floor [23],[26],[27],[32],[33]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount | € [16],[23],[26],[27],[32],[33]                     € 34.7    
Amortized Cost [23],[26],[27],[32],[33]               $ (39,100,000)          
Fair Value [4],[23],[26],[27],[32],[33]               $ 0          
Investment, Identifier [Axis]: Amtek Global Technology Pte Ltd | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[23],[26],[27],[32],[33]               5.00% 5.00% 5.00% 5.00% 5.00% 5.00%
Investment, Identifier [Axis]: Amtek Global Technology Pte Ltd 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[23],[26],[27],[32],[33]               5.00% 5.00% 5.00% 5.00% 5.00% 5.00%
Base Rate Floor [23],[26],[27],[32],[33]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount | € [16],[23],[26],[27],[32],[33]                     € 57.2    
Amortized Cost [23],[26],[27],[32],[33]               $ (68,700,000)          
Fair Value [4],[23],[26],[27],[32],[33]               $ (34,800,000)          
Investment, Identifier [Axis]: Amtek Global Technology Pte Ltd 1 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[23],[26],[27],[32],[33]               5.00% 5.00% 5.00% 5.00% 5.00% 5.00%
Investment, Identifier [Axis]: Amtek Global Technology Pte Ltd, Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[27],[32],[33],[46]               7,046,126 7,046,126 7,046,126 7,046,126 7,046,126 7,046,126
Amortized Cost [26],[27],[32],[33],[46]               $ 0          
Fair Value [4],[26],[27],[32],[33],[46]               $ 0          
Investment, Identifier [Axis]: Amtek Global Technology Pte Ltd, Common Stock, Equity/Other, Automobiles & Components                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[9],[31],[34],[47] 7,046,126 7,046,126 7,046,126 7,046,126 7,046,126 7,046,126 7,046,126            
Amortized Cost [8],[9],[31],[34],[47] $ 0                        
Fair Value [3],[8],[9],[31],[34],[47] $ 0                        
Investment, Identifier [Axis]: Amtek Global Technology Pte Ltd, Ordinary Shares                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[27],[32],[33]               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 [26],[27],[32],[33]               $ (30,700,000)          
Fair Value [4],[26],[27],[32],[33]               $ 0          
Investment, Identifier [Axis]: Amtek Global Technology Pte Ltd, Ordinary Shares, Equity/Other, Automobiles & Components                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[9],[31],[34] 5,735,804,056 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 [8],[9],[31],[34] $ (30,700,000)                        
Fair Value [3],[8],[9],[31],[34] $ 0                        
Investment, Identifier [Axis]: Amtek Global Technology Pte Ltd, Private Equity                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[27],[32],[33]               4,097 4,097 4,097 4,097 4,097 4,097
Amortized Cost [26],[27],[32],[33]               $ 0          
Fair Value [4],[26],[27],[32],[33]               $ 0          
Investment, Identifier [Axis]: Amtek Global Technology Pte Ltd, Private Equity, Equity/Other, Automobiles & Components                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[9],[31],[34] 4,097 4,097 4,097 4,097 4,097 4,097 4,097            
Amortized Cost [8],[9],[31],[34] $ 0                        
Fair Value [3],[8],[9],[31],[34] $ 0                        
Investment, Identifier [Axis]: Angelica Corp                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14]               10.00% 10.00% 10.00% 10.00% 10.00% 10.00%
Principal amount [16],[23],[26],[48]               $ 53,400,000          
Amortized Cost [23],[26],[48]               (42,300,000)          
Fair Value [4],[23],[26],[48]               $ (5,200,000)          
Investment, Identifier [Axis]: Angelica Corp | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[23],[26],[48]               10.00% 10.00% 10.00% 10.00% 10.00% 10.00%
Investment, Identifier [Axis]: Angelica Corp, Limited Partnership Interest                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[48]               877,044 877,044 877,044 877,044 877,044 877,044
Amortized Cost [26],[48]               $ (47,600,000)          
Fair Value [4],[26],[48]               $ 0          
Investment, Identifier [Axis]: Angelica Corp, Limited Partnership Interest, Equity/Other, Health Care Equipment & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [31],[49] 877,044 877,044 877,044 877,044 877,044 877,044 877,044            
Amortized Cost [31],[49] $ (47,600,000)                        
Fair Value [3],[31],[49] $ 0                        
Investment, Identifier [Axis]: Angelica Corp, Other Senior Debt, Health Care Equipment & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[28],[31],[49] 10.00% 10.00% 10.00% 10.00% 10.00% 10.00% 10.00%            
Principal amount [13],[28],[31],[49] $ 56,100,000                        
Amortized Cost [28],[31],[49] (42,300,000)                        
Fair Value [3],[28],[31],[49] $ (900,000)                        
Investment, Identifier [Axis]: Angelica Corp, Other Senior Debt, Health Care Equipment & Services | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[28],[31],[49] 10.00% 10.00% 10.00% 10.00% 10.00% 10.00% 10.00%            
Investment, Identifier [Axis]: Apex Group Limited                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[27],[33]               6.75% 6.75% 6.75% 6.75% 6.75% 6.75%
Base Rate Floor [27],[33]               0.50% 0.50% 0.50% 0.50% 0.50% 0.50%
Principal amount [16],[27],[33]               $ 8,000,000.0          
Amortized Cost [27],[33]               (7,900,000)          
Fair Value [4],[27],[33]               $ (8,000,000.0)          
Investment, Identifier [Axis]: Apex Group Limited | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.75% 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%            
Base Rate Floor 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%            
Principal amount $ 40,000,000.0                        
Amortized Cost (39,700,000)                        
Fair Value $ (38,800,000)                        
Investment, Identifier [Axis]: Apex Group Limited 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 3.75% 3.75% 3.75% 3.75% 3.75% 3.75% 3.75% 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%
Base Rate Floor 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%
Principal amount $ 4,200,000             $ 32,000,000.0          
Amortized Cost (4,200,000)             (31,700,000)          
Fair Value $ (4,000,000.0)             $ (32,000,000.0)          
Investment, Identifier [Axis]: Apex Group Limited 2 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 4.00% 4.00% 4.00% 4.00% 4.00% 4.00% 4.00%            
Base Rate Floor 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount | €       € 1.6                  
Amortized Cost $ (1,900,000)                        
Fair Value $ (1,500,000)                        
Investment, Identifier [Axis]: Apex Group Limited E+400 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               4.00% 4.00% 4.00% 4.00% 4.00% 4.00%
Base Rate Floor               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount | €                     € 1.6    
Amortized Cost               $ (1,900,000)          
Fair Value               $ (1,800,000)          
Investment, Identifier [Axis]: Apex Group Limited L+375 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               3.75% 3.75% 3.75% 3.75% 3.75% 3.75%
Base Rate Floor               0.50% 0.50% 0.50% 0.50% 0.50% 0.50%
Principal amount               $ 4,200,000          
Amortized Cost               (4,200,000)          
Fair Value               $ (4,200,000)          
Investment, Identifier [Axis]: Apex Group Limited, Senior Secured Loans - First Lien, Diversified Financials 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9],[39] 3.75% 3.75% 3.75% 3.75% 3.75% 3.75% 3.75%            
Base Rate Floor [5],[8],[9],[39] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%            
Principal amount [8],[9],[13],[39] $ 2,500,000                        
Amortized Cost [8],[9],[39] (2,500,000)                        
Fair Value [3],[8],[9],[39] $ (2,400,000)                        
Investment, Identifier [Axis]: Apex Group Limited, Senior Secured Loans - First Lien, Diversified Financials 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9],[39] 4.00% 4.00% 4.00% 4.00% 4.00% 4.00% 4.00%            
Base Rate Floor [5],[8],[9],[39] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount [8],[9],[13],[39] $ 2,000,000.0                        
Amortized Cost [8],[9],[39] (2,300,000)                        
Fair Value [3],[8],[9],[39] $ (1,900,000)                        
Investment, Identifier [Axis]: Apex Group Limited, Senior Secured Loans -Second Lien, Diversified Financials                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9] 6.75% 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%            
Base Rate Floor [5],[8],[9] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%            
Principal amount [8],[9],[13] $ 55,000,000.0                        
Amortized Cost [8],[9] (54,000,000.0)                        
Fair Value [3],[8],[9] $ (53,400,000)                        
Investment, Identifier [Axis]: Arcfield Acquisition Corp | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount $ 8,100,000                        
Amortized Cost (8,000,000.0)                        
Fair Value $ (7,900,000)                        
Investment, Identifier [Axis]: Arcfield Acquisition Group, Senior Secured Loans - First Lien, Capital Goods 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[10] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[8],[10] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[10],[13] $ 40,400,000                        
Amortized Cost [8],[10] (40,000,000.0)                        
Fair Value [3],[8],[10] $ (39,600,000)                        
Investment, Identifier [Axis]: Arcfield Acquisition Group, Senior Secured Loans - First Lien, Capital Goods 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount | £ [13],[20]         £ 7.1                
Amortized Cost [20] $ (7,100,000)                        
Fair Value [3],[20] $ (6,900,000)                        
Investment, Identifier [Axis]: Arcos LLC/VA | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount $ 22,300,000             $ 22,400,000          
Amortized Cost (22,100,000)             (22,200,000)          
Fair Value $ (21,200,000)             $ (22,300,000)          
Investment, Identifier [Axis]: Arcos LLC/VA, Preferred Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Base Rate Floor [33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Number of Shares | shares [33]               15,000,000 15,000,000 15,000,000 15,000,000 15,000,000 15,000,000
Amortized Cost [33]               $ (14,000,000.0)          
Fair Value [4],[33]               $ (15,500,000)          
Investment, Identifier [Axis]: Arcos LLC/VA, Preferred Stock | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[33]               9.50% 9.50% 9.50% 9.50% 9.50% 9.50%
Investment, Identifier [Axis]: Arcos LLC/VA, Preferred Stock, Equity/Other, Software & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8] 9.50% 9.50% 9.50% 9.50% 9.50% 9.50% 9.50%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Number of Shares | shares [8] 15,000,000 15,000,000 15,000,000 15,000,000 15,000,000 15,000,000 15,000,000            
Amortized Cost [8] $ (14,000,000.0)                        
Fair Value [3],[8] $ (13,700,000)                        
Investment, Identifier [Axis]: Arcos LLC/VA, Preferred Stock, Equity/Other, Software & Services | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8] 9.50% 9.50% 9.50% 9.50% 9.50% 9.50% 9.50%            
Investment, Identifier [Axis]: Arcos LLC/VA, Senior Secured Loans - First Lien, Software & Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[42] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[42] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount | £ [13],[42]         £ 12.4                
Amortized Cost [42] $ (12,200,000)                        
Fair Value [3],[42] $ (11,800,000)                        
Investment, Identifier [Axis]: Arcos LLC/VA, Senior Secured Loans - First Lien, Software & Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[20]           $ 4.5              
Amortized Cost [20] $ (4,500,000)                        
Fair Value [3],[20] $ (4,300,000)                        
Investment, Identifier [Axis]: Arcos LLC/VA, Senior Secured Loans—First Lien, Software & Services, Maturing April 20, 2027                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 4,500,000          
Amortized Cost [15]               (4,500,000)          
Fair Value [4],[15]               $ (4,500,000)          
Investment, Identifier [Axis]: Arcos LLC/VA, Senior Secured Loans—First Lien, Software & Services, Maturing March 31, 2028                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[41]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor [41]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[41]               $ 12,500,000          
Amortized Cost [41]               (12,300,000)          
Fair Value [4],[41]               $ (12,400,000)          
Investment, Identifier [Axis]: Ardonagh Group Ltd                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[27],[33],[38]               12.80% 12.80% 12.80% 12.80% 12.80% 12.80%
Principal amount [16],[27],[33],[38]               $ 900,000          
Amortized Cost [27],[33],[38]               (900,000)          
Fair Value [4],[27],[33],[38]               $ (1,000,000.0)          
Investment, Identifier [Axis]: Ardonagh Group Ltd | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[27],[33],[38]               12.80% 12.80% 12.80% 12.80% 12.80% 12.80%
Investment, Identifier [Axis]: Ardonagh Group Ltd 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 7.00% 7.00% 7.00% 7.00% 7.00% 7.00% 7.00%            
Base Rate Floor 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount | £         £ 3.8                
Amortized Cost $ (4,700,000)                        
Fair Value $ (4,200,000)                        
Investment, Identifier [Axis]: Ardonagh Group Ltd 2 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 7.00% 7.00% 7.00% 7.00% 7.00% 7.00% 7.00%            
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount | €       € 0.5                  
Amortized Cost $ (500,000)                        
Fair Value $ (500,000)                        
Investment, Identifier [Axis]: Ardonagh Group Ltd 3 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount $ 54,800,000                        
Amortized Cost (54,200,000)                        
Fair Value $ (52,800,000)                        
Investment, Identifier [Axis]: Ardonagh Group Ltd E+675 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               6.75% 6.75% 6.75% 6.75% 6.75% 6.75%
Base Rate Floor               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount | €                     € 0.5    
Amortized Cost               $ (500,000)          
Fair Value               $ (600,000)          
Investment, Identifier [Axis]: Ardonagh Group Ltd L+550 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Base Rate Floor               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount               $ 40,700,000          
Amortized Cost               (40,300,000)          
Fair Value               $ (40,300,000)          
Investment, Identifier [Axis]: Ardonagh Group Ltd L+675 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               6.75% 6.75% 6.75% 6.75% 6.75% 6.75%
Base Rate Floor               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount | £                       £ 3.8  
Amortized Cost               $ (4,700,000)          
Fair Value               $ (5,200,000)          
Investment, Identifier [Axis]: Ardonagh Group Ltd, Senior Secured Loans - First Lien, Insurance 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9] 7.00% 7.00% 7.00% 7.00% 7.00% 7.00% 7.00%            
Base Rate Floor [5],[8],[9] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[9],[13]           $ 0.8              
Amortized Cost [8],[9] $ (1,000,000.0)                        
Fair Value [3],[8],[9] $ (900,000)                        
Investment, Identifier [Axis]: Ardonagh Group Ltd, Senior Secured Loans - First Lien, Insurance 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[9],[20] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[9],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [9],[13],[20] $ 16,700,000                        
Amortized Cost [9],[20] (22,800,000)                        
Fair Value [3],[9],[20] $ (21,900,000)                        
Investment, Identifier [Axis]: Ardonagh Group Ltd, Senior Secured Loans—First Lien, Insurance, Maturing July 14, 2026 - 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15],[27]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Base Rate Floor [15],[27]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount | £ [15],[16],[27]                       £ 16.7  
Amortized Cost [15],[27]               $ (22,800,000)          
Fair Value [4],[15],[27]               $ (22,100,000)          
Investment, Identifier [Axis]: Ardonagh Group Ltd, Senior Secured Loans—First Lien, Insurance, Maturing July 14, 2026 -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[27],[33]               6.75% 6.75% 6.75% 6.75% 6.75% 6.75%
Base Rate Floor [27],[33]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount | £ [16],[27],[33]                       £ 0.8  
Amortized Cost [27],[33]               $ (1,000,000.0)          
Fair Value [4],[27],[33]               $ (1,100,000)          
Investment, Identifier [Axis]: Ardonagh Group Ltd, Senior Secured Loans—First Lien, Insurance, Maturing July 14, 2026 -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[27],[33]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Base Rate Floor [27],[33]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [16],[27],[33]               $ 14,100,000          
Amortized Cost [27],[33]               (13,800,000)          
Fair Value [4],[27],[33]               $ (13,900,000)          
Investment, Identifier [Axis]: Ardonagh Group Ltd, Subordinated Debt, Insurance                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[9],[39] 12.80% 12.80% 12.80% 12.80% 12.80% 12.80% 12.80%            
Principal amount [8],[9],[13],[39] $ 1,000,000.0                        
Amortized Cost [8],[9],[39] (1,000,000.0)                        
Fair Value [3],[8],[9],[39] $ (1,000,000.0)                        
Investment, Identifier [Axis]: Ardonagh Group Ltd, Subordinated Debt, Insurance | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[9],[39] 12.80% 12.80% 12.80% 12.80% 12.80% 12.80% 12.80%            
Investment, Identifier [Axis]: Ardonagh Ltd, Ordinary Shares, Equity/Other, Insurance -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[27],[33]               16,450 16,450 16,450 16,450 16,450 16,450
Amortized Cost [26],[27],[33]               $ 0          
Fair Value [4],[26],[27],[33]               $ (2,800,000)          
Investment, Identifier [Axis]: Ardonagh Ltd, Ordinary Shares, Equity/Other, Insurance -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[27],[33]               116,814 116,814 116,814 116,814 116,814 116,814
Amortized Cost [26],[27],[33]               $ (200,000)          
Fair Value [4],[26],[27],[33]               $ (500,000)          
Investment, Identifier [Axis]: Ardonagh Ltd, Preferred Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[27],[33]               6,113,719 6,113,719 6,113,719 6,113,719 6,113,719 6,113,719
Amortized Cost [26],[27],[33]               $ (9,100,000)          
Fair Value [4],[26],[27],[33]               $ (22,000,000.0)          
Investment, Identifier [Axis]: Arena Energy LP, Warrants                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33]               68,186,525 68,186,525 68,186,525 68,186,525 68,186,525 68,186,525
Amortized Cost [26],[33]               $ (400,000)          
Fair Value [4],[26],[33]               $ (600,000)          
Investment, Identifier [Axis]: Arena Energy LP, Warrants, Equity/Other, Energy                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8] 68,186,525 68,186,525 68,186,525 68,186,525 68,186,525 68,186,525 68,186,525            
Amortized Cost [8] $ (400,000)                        
Fair Value [3],[8] $ (500,000)                        
Investment, Identifier [Axis]: Arrotex Australia Group Pty Ltd 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%            
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount           $ 109.4              
Amortized Cost $ (73,900,000)                        
Fair Value $ (70,100,000)                        
Investment, Identifier [Axis]: Arrotex Australia Group Pty Ltd 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               5.25% 5.25% 5.25% 5.25% 5.25% 5.25%
Base Rate Floor               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount                         $ 109.4
Amortized Cost               $ (73,600,000)          
Fair Value               $ (79,700,000)          
Investment, Identifier [Axis]: Arrotex Australia Group Pty Ltd 2 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount           $ 8.0             $ 8.0
Amortized Cost $ (5,700,000)             $ (5,700,000)          
Fair Value $ (5,100,000)             $ (5,800,000)          
Investment, Identifier [Axis]: Arrotex Australia Group Pty Ltd, Senior Secured Loans—First Lien, Pharmaceuticals, Biotechnology & Life Sciences, July 10, 2024 -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[27],[33]               5.25% 5.25% 5.25% 5.25% 5.25% 5.25%
Base Rate Floor [27],[33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[27],[33]                         $ 42.6
Amortized Cost [27],[33]               $ (30,400,000)          
Fair Value [4],[27],[33]               $ (30,900,000)          
Investment, Identifier [Axis]: Arrotex Australia Group Pty Ltd, Senior Secured Loans—First Lien, Pharmaceuticals, Biotechnology & Life Sciences, July 10, 2024 -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[27],[33]               5.25% 5.25% 5.25% 5.25% 5.25% 5.25%
Base Rate Floor [27],[33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[27],[33]                         $ 3.1
Amortized Cost [27],[33]               $ (2,200,000)          
Fair Value [4],[27],[33]               $ (2,300,000)          
Investment, Identifier [Axis]: Arrotex Australia Group Pty Ltd, Senior Secured Loans - First Lien, Pharmaceuticals, Biotechnology & Life Sciences 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9] 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%            
Base Rate Floor [5],[8],[9] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[9],[13] $ 42,600,000                        
Amortized Cost [8],[9] (30,900,000)                        
Fair Value [3],[8],[9] $ (27,400,000)                        
Investment, Identifier [Axis]: Arrotex Australia Group Pty Ltd, Senior Secured Loans - First Lien, Pharmaceuticals, Biotechnology & Life Sciences 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9] 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%            
Base Rate Floor [5],[8],[9] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[9],[13] $ 3,100,000                        
Amortized Cost [8],[9] (2,200,000)                        
Fair Value [3],[8],[9] $ (2,000,000.0)                        
Investment, Identifier [Axis]: Ascent Resources Utica Holdings LLC / ARU Finance Corp, Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[50]               10,193 10,193 10,193 10,193 10,193 10,193
Amortized Cost [26],[50]               $ (9,700,000)          
Fair Value [4],[26],[50]               $ (2,300,000)          
Investment, Identifier [Axis]: Ascent Resources Utica Holdings LLC / ARU Finance Corp, Common Stock | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares 13,556 13,556 13,556 13,556 13,556 13,556 13,556            
Amortized Cost $ (3,600,000)                        
Fair Value $ (3,700,000)                        
Investment, Identifier [Axis]: Ascent Resources Utica Holdings LLC / ARU Finance Corp, Common Stock 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares               13,556 13,556 13,556 13,556 13,556 13,556
Amortized Cost               $ (3,600,000)          
Fair Value               $ (3,100,000)          
Investment, Identifier [Axis]: Ascent Resources Utica Holdings LLC / ARU Finance Corp, Common Stock, Equity/Other, Energy                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [31],[51] 10,193 10,193 10,193 10,193 10,193 10,193 10,193            
Amortized Cost [31],[51] $ (9,700,000)                        
Fair Value [3],[31],[51] $ (2,800,000)                        
Investment, Identifier [Axis]: Ascent Resources Utica Holdings LLC / ARU Finance Corp, Trade Claim | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares 115,178,571 115,178,571 115,178,571 115,178,571 115,178,571 115,178,571 115,178,571 115,178,571 115,178,571 115,178,571 115,178,571 115,178,571 115,178,571
Amortized Cost $ (30,500,000)             $ (30,500,000)          
Fair Value $ (31,200,000)             $ (26,400,000)          
Investment, Identifier [Axis]: Ascent Resources Utica Holdings LLC / ARU Finance Corp, Trade Claim 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[50]               86,607,143 86,607,143 86,607,143 86,607,143 86,607,143 86,607,143
Amortized Cost [26],[50]               $ (19,400,000)          
Fair Value [4],[26],[50]               $ (19,800,000)          
Investment, Identifier [Axis]: Ascent Resources Utica Holdings LLC / ARU Finance Corp, Trade Claim, Equity/Other, Energy                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [31],[51] 86,607,143 86,607,143 86,607,143 86,607,143 86,607,143 86,607,143 86,607,143            
Amortized Cost [31],[51] $ (19,400,000)                        
Fair Value [3],[31],[51] $ (23,500,000)                        
Investment, Identifier [Axis]: Aspect Software Inc                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[33]               8.00% 8.00% 8.00% 8.00% 8.00% 8.00%
Principal amount [16],[33]               $ 300,000          
Amortized Cost [33]               (200,000)          
Fair Value [4],[33]               $ (300,000)          
Investment, Identifier [Axis]: Aspect Software Inc | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[33]               8.00% 8.00% 8.00% 8.00% 8.00% 8.00%
Investment, Identifier [Axis]: Aspect Software Inc, Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [18],[26],[33],[35]               1,309,955 1,309,955 1,309,955 1,309,955 1,309,955 1,309,955
Amortized Cost [18],[26],[33],[35]               $ (2,300,000)          
Fair Value [4],[18],[26],[33],[35]               $ (2,700,000)          
Investment, Identifier [Axis]: Aspect Software Inc, Warrant                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [18],[26],[33],[35]               181,730 181,730 181,730 181,730 181,730 181,730
Amortized Cost [18],[26],[33],[35]               $ (300,000)          
Fair Value [4],[18],[26],[33],[35]               $ (300,000)          
Investment, Identifier [Axis]: Australis Maritime, Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [27],[33]               46,781,830 46,781,830 46,781,830 46,781,830 46,781,830 46,781,830
Amortized Cost [27],[33]               $ (45,100,000)          
Fair Value [4],[27],[33]               $ (46,700,000)          
Investment, Identifier [Axis]: Australis Maritime, Common Stock, Asset Based Finance, Transportation                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[9] 43,151,590 43,151,590 43,151,590 43,151,590 43,151,590 43,151,590 43,151,590            
Amortized Cost [8],[9] $ (41,700,000)                        
Fair Value [3],[8],[9] $ (43,600,000)                        
Investment, Identifier [Axis]: Avenue One PropCo, Private Equity, Asset Based Finance, Real Estate                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[9] 41,348,722 41,348,722 41,348,722 41,348,722 41,348,722 41,348,722 41,348,722            
Amortized Cost [8],[9] $ (41,300,000)                        
Fair Value [3],[8],[9] $ (41,300,000)                        
Investment, Identifier [Axis]: Avida Holding AB, Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[27],[32],[33]               405,023,756 405,023,756 405,023,756 405,023,756 405,023,756 405,023,756
Amortized Cost [26],[27],[32],[33]               $ (44,600,000)          
Fair Value [4],[26],[27],[32],[33]               $ (52,300,000)          
Investment, Identifier [Axis]: Avida Holding AB, Common Stock, Asset Based Finance, Diversified Financials                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[9],[31],[34] 405,023,756 405,023,756 405,023,756 405,023,756 405,023,756 405,023,756 405,023,756            
Amortized Cost [8],[9],[31],[34] $ (44,600,000)                        
Fair Value [3],[8],[9],[31],[34] $ (37,700,000)                        
Investment, Identifier [Axis]: AxiomSL Ltd, Senior Secured Loans - First Lien, Software & Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[21],[22],[42] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Base Rate Floor [5],[8],[21],[22],[42] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13],[21],[22],[42] $ 34,800,000                        
Amortized Cost [8],[21],[22],[42] (34,200,000)                        
Fair Value [3],[8],[21],[22],[42] $ (34,100,000)                        
Investment, Identifier [Axis]: AxiomSL Ltd, Senior Secured Loans - First Lien, Software & Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[20] $ 2,500,000                        
Amortized Cost [20] (2,400,000)                        
Fair Value [3],[20] $ (2,400,000)                        
Investment, Identifier [Axis]: AxiomSL Ltd, Senior Secured Loans - First Lien, Software & Services 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[20] $ 2,300,000                        
Amortized Cost [20] (2,300,000)                        
Fair Value [3],[20] $ (2,200,000)                        
Investment, Identifier [Axis]: AxiomSL Ltd, Senior Secured Loans—First Lien, Software & Services, Maturing December 3, 2025                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 2,500,000          
Amortized Cost [15]               (2,400,000)          
Fair Value [4],[15]               $ (2,400,000)          
Investment, Identifier [Axis]: AxiomSL Ltd, Senior Secured Loans—First Lien, Software & Services, Maturing December 3, 2027 -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33],[40],[41],[45]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Base Rate Floor [33],[40],[41],[45]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33],[40],[41],[45]               $ 35,100,000          
Amortized Cost [33],[40],[41],[45]               (34,400,000)          
Fair Value [4],[33],[40],[41],[45]               $ (34,400,000)          
Investment, Identifier [Axis]: AxiomSL Ltd, Senior Secured Loans—First Lien, Software & Services, Maturing December 3, 2027- 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 2,300,000          
Amortized Cost [15]               (2,300,000)          
Fair Value [4],[15]               $ (2,200,000)          
Investment, Identifier [Axis]: BGB Group LLC | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount               $ 48,500,000          
Amortized Cost               (48,200,000)          
Fair Value               $ (48,300,000)          
Investment, Identifier [Axis]: BGB Group LLC | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount $ 54,500,000                        
Amortized Cost (54,100,000)                        
Fair Value $ (53,700,000)                        
Investment, Identifier [Axis]: BGB Group LLC, Senior Secured Loans - First Lien, Media & Entertainment 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[10],[11],[12],[21],[22],[42] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[10],[11],[12],[21],[22],[42] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [10],[11],[12],[13],[21],[22],[42] $ 111,400,000                        
Amortized Cost [10],[11],[12],[21],[22],[42] (110,400,000)                        
Fair Value [3],[10],[11],[12],[21],[22],[42] $ (109,700,000)                        
Investment, Identifier [Axis]: BGB Group LLC, Senior Secured Loans - First Lien, Media & Entertainment 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[20] $ 19,900,000                        
Amortized Cost [20] (19,900,000)                        
Fair Value [3],[20] $ (19,600,000)                        
Investment, Identifier [Axis]: BGB Group LLC, Senior Secured Loans—First Lien, Media & Entertainment -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[17],[18],[19],[33],[40],[41],[45]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor [17],[18],[19],[33],[40],[41],[45]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[17],[18],[19],[33],[40],[41],[45]               $ 118,600,000          
Amortized Cost [17],[18],[19],[33],[40],[41],[45]               (117,500,000)          
Fair Value [4],[17],[18],[19],[33],[40],[41],[45]               $ (118,000,000.0)          
Investment, Identifier [Axis]: BGB Group LLC, Senior Secured Loans—First Lien, Media & Entertainment -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 19,900,000          
Amortized Cost [15]               (19,900,000)          
Fair Value [4],[15]               $ (19,800,000)          
Investment, Identifier [Axis]: Bank of Ireland, Class B Credit Linked Floating Rate Note                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[27],[46]               11.85% 11.85% 11.85% 11.85% 11.85% 11.85%
Principal amount [27],[46]               $ 14,700,000          
Amortized Cost [27],[46]               (14,700,000)          
Fair Value [4],[27],[46]               $ (14,700,000)          
Investment, Identifier [Axis]: Barbri Inc | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount           $ 47.4   $ 47,700,000          
Amortized Cost $ (47,400,000)             (47,700,000)          
Fair Value $ (47,400,000)             $ (47,700,000)          
Investment, Identifier [Axis]: Barbri Inc, Senior Secured Loans - First Lien, Consumer Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[11],[12],[21],[22],[42] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[8],[11],[12],[21],[22],[42] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[11],[12],[13],[21],[22],[42] $ 132,100,000                        
Amortized Cost [8],[11],[12],[21],[22],[42] (127,900,000)                        
Fair Value [3],[8],[11],[12],[21],[22],[42] $ (132,100,000)                        
Investment, Identifier [Axis]: Barbri Inc, Senior Secured Loans - First Lien, Consumer Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [13],[20] $ 9,100,000                        
Amortized Cost [20] (9,100,000)                        
Fair Value [3],[20] $ (9,100,000)                        
Investment, Identifier [Axis]: Barbri Inc, Senior Secured Loans—First Lien, Consumer Services, Maturing April 28, 2028                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[17],[18]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor [17],[18],[33],[40],[41],[45]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [16],[17],[18],[33],[40],[41],[45]               $ 92,400,000          
Amortized Cost [17],[18],[33],[40],[41],[45]               (88,100,000)          
Fair Value [4],[17],[18],[33],[40],[41],[45]               $ (92,400,000)          
Investment, Identifier [Axis]: Barbri Inc, Senior Secured Loans—First Lien, Consumer Services, Maturing April 30, 2028 - 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Base Rate Floor [17],[18]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [16],[17],[18]               $ 35,100,000          
Amortized Cost [17],[18]               (34,800,000)          
Fair Value [4],[17],[18]               $ (34,800,000)          
Investment, Identifier [Axis]: Barbri Inc, Senior Secured Loans—First Lien, Consumer Services, Maturing April 30, 2028 -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor [15]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [15],[16]               $ 14,800,000          
Amortized Cost [15]               (14,800,000)          
Fair Value [4],[15]               $ (14,600,000)          
Investment, Identifier [Axis]: BearCom Acquisition Corp 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount           $ 2.2   $ 14,400,000          
Amortized Cost $ (2,200,000)             (10,500,000)          
Fair Value $ (2,100,000)             $ (11,000,000.0)          
Investment, Identifier [Axis]: BearCom Acquisition Corp 2 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount             $ 14.3 $ 1,300,000          
Amortized Cost $ (10,600,000)             (1,000,000.0)          
Fair Value $ (10,100,000)             $ (1,000,000.0)          
Investment, Identifier [Axis]: BearCom Acquisition Corp 3 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount             $ 1.3            
Amortized Cost $ (1,000,000.0)                        
Fair Value $ (900,000)                        
Investment, Identifier [Axis]: BearCom Acquisition Corp L+600 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Base Rate Floor               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount               $ 2,200,000          
Amortized Cost               (2,200,000)          
Fair Value               $ (2,100,000)          
Investment, Identifier [Axis]: Belk Inc                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[23],[26],[33],[43]               10.00% 10.00% 10.00% 10.00% 10.00% 10.00%
Base Rate Floor [23],[26],[33],[43]              
Principal amount [16],[23],[26],[33],[43]               $ 25,500,000          
Amortized Cost [23],[26],[33],[43]               (4,200,000)          
Fair Value [4],[23],[26],[33],[43]               $ (6,700,000)          
Investment, Identifier [Axis]: Belk Inc | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[23],[26],[33],[43]               10.00% 10.00% 10.00% 10.00% 10.00% 10.00%
Investment, Identifier [Axis]: Belk Inc 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 7.50% 7.50% 7.50% 7.50% 7.50% 7.50% 7.50% 7.50% 7.50% 7.50% 7.50% 7.50% 7.50%
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount $ 600,000             $ 600,000          
Amortized Cost (600,000)             (600,000)          
Fair Value $ (600,000)             $ (600,000)          
Investment, Identifier [Axis]: Belk Inc 2 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 500.00% 500.00% 500.00% 500.00% 500.00% 500.00%
Interest rate, paid in kind 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 800.00% 800.00% 800.00% 800.00% 800.00% 800.00%
Principal amount $ 3,000,000.0             $ 2,900,000          
Amortized Cost (1,700,000)             (1,500,000)          
Fair Value $ (600,000)             $ (2,100,000)          
Investment, Identifier [Axis]: Belk Inc 2 | Maximum | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 800.00% 800.00% 800.00% 800.00% 800.00% 800.00%
Investment, Identifier [Axis]: Belk Inc, Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33],[43]               94,950 94,950 94,950 94,950 94,950 94,950
Amortized Cost [26],[33],[43]               $ 0          
Fair Value [4],[26],[33],[43]               $ 0          
Investment, Identifier [Axis]: Belk Inc, Common Stock | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares 381 381 381 381 381 381 381            
Amortized Cost $ 0                        
Fair Value $ 0                        
Investment, Identifier [Axis]: Belk Inc, Common Stock 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares               381 381 381 381 381 381
Amortized Cost               $ 0          
Fair Value               $ 0          
Investment, Identifier [Axis]: Belk Inc, Common Stock, Equity/Other, Retailing                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[44] 94,950 94,950 94,950 94,950 94,950 94,950 94,950            
Amortized Cost [8],[44] $ 0                        
Fair Value [3],[8],[44] $ 0                        
Investment, Identifier [Axis]: Belk Inc, Senior Secured Loans - First Lien, Retailing 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[39],[44] 7.50% 7.50% 7.50% 7.50% 7.50% 7.50% 7.50%            
Base Rate Floor [5],[8],[39],[44] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13],[39],[44] $ 21,900,000                        
Amortized Cost [8],[39],[44] (21,800,000)                        
Fair Value [3],[8],[39],[44] $ (19,600,000)                        
Investment, Identifier [Axis]: Belk Inc, Senior Secured Loans - First Lien, Retailing 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[28],[31],[39],[44] 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%            
Interest rate, paid in kind [5],[8],[28],[31],[39],[44] 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%            
Principal amount [8],[13],[28],[31],[39],[44] $ 69,900,000                        
Amortized Cost [8],[28],[31],[39],[44] (43,500,000)                        
Fair Value [3],[8],[28],[31],[39],[44] $ (12,900,000)                        
Investment, Identifier [Axis]: Belk Inc, Senior Secured Loans - First Lien, Retailing 2 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[28],[31],[39],[44] 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%            
Investment, Identifier [Axis]: Belk Inc, Senior Secured Loans -Second Lien, Retailing                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[28],[31],[44] 10.00% 10.00% 10.00% 10.00% 10.00% 10.00% 10.00%            
Base Rate Floor [5],[8],[28],[31],[44]            
Principal amount [8],[13],[28],[31],[44] $ 27,500,000                        
Amortized Cost [8],[28],[31],[44] (4,200,000)                        
Fair Value [3],[8],[28],[31],[44] $ (3,700,000)                        
Investment, Identifier [Axis]: Belk Inc, Senior Secured Loans -Second Lien, Retailing | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[28],[31],[44] 10.00% 10.00% 10.00% 10.00% 10.00% 10.00% 10.00%            
Investment, Identifier [Axis]: Belk Inc, Senior Secured Loans—First Lien, Retailing, Maturing July 31, 2025 -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33],[38],[43]               7.50% 7.50% 7.50% 7.50% 7.50% 7.50%
Base Rate Floor [33],[38],[43]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33],[38],[43]               $ 21,900,000          
Amortized Cost [33],[38],[43]               (21,700,000)          
Fair Value [4],[33],[38],[43]               $ (21,900,000)          
Investment, Identifier [Axis]: Belk Inc, Senior Secured Loans—First Lien, Retailing, Maturing July 31, 2025 -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33],[38],[43]               5.00% 5.00% 5.00% 5.00% 5.00% 5.00%
Interest rate, paid in kind [14],[33],[38],[43]               8.00% 8.00% 8.00% 8.00% 8.00% 8.00%
Principal amount [16],[33],[38],[43]               $ 66,700,000          
Amortized Cost [33],[38],[43]               (40,200,000)          
Fair Value [4],[33],[38],[43]               $ (49,200,000)          
Investment, Identifier [Axis]: Belk Inc, Senior Secured Loans—First Lien, Retailing, Maturing July 31, 2025 -2 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[33],[38],[43]               8.00% 8.00% 8.00% 8.00% 8.00% 8.00%
Investment, Identifier [Axis]: Big Bus Tours Ltd 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 8.50% 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%            
Interest rate, paid in kind 8.50% 8.50% 8.50% 8.50% 8.50% 8.50% 8.50% 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount $ 17,600,000             $ 16,400,000          
Amortized Cost (17,600,000)             (16,400,000)          
Fair Value $ (14,400,000)             $ (10,300,000)          
Investment, Identifier [Axis]: Big Bus Tours Ltd 1 | Maximum | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind               8.50% 8.50% 8.50% 8.50% 8.50% 8.50%
Investment, Identifier [Axis]: Big Bus Tours Ltd 2 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 8.50% 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%            
Interest rate, paid in kind 8.50% 8.50% 8.50% 8.50% 8.50% 8.50% 8.50% 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount | €       € 12.4             € 11.5    
Amortized Cost $ (13,800,000)             $ (12,900,000)          
Fair Value $ (9,900,000)             $ (8,300,000)          
Investment, Identifier [Axis]: Big Bus Tours Ltd 2 | Maximum | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind               8.50% 8.50% 8.50% 8.50% 8.50% 8.50%
Investment, Identifier [Axis]: Borden (New Dairy Opco) 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33],[43]               7.00% 7.00% 7.00% 7.00% 7.00% 7.00%
Interest rate, paid in kind [14],[33],[43]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Base Rate Floor [33],[43]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33],[43]               $ 42,000,000.0          
Amortized Cost [33],[43]               (40,200,000)          
Fair Value [4],[33],[43]               $ (42,000,000.0)          
Investment, Identifier [Axis]: Borden (New Dairy Opco) 1 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[33],[43]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Investment, Identifier [Axis]: Borden (New Dairy Opco) 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33],[43]               2.50% 2.50% 2.50% 2.50% 2.50% 2.50%
Base Rate Floor [33],[43]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33],[43]               $ 9,000,000.0          
Amortized Cost [33],[43]               (8,400,000)          
Fair Value [4],[33],[43]               $ (9,000,000.0)          
Investment, Identifier [Axis]: Borden (New Dairy Opco), Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[43],[48],[52]               11,167,000 11,167,000 11,167,000 11,167,000 11,167,000 11,167,000
Amortized Cost [26],[43],[48],[52]               $ (9,100,000)          
Fair Value [4],[26],[43],[48],[52]               $ (7,700,000)          
Investment, Identifier [Axis]: Borden (New Dairy Opco), Common Stock, Equity/Other, Food, Beverage & Tobacco                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [31],[44],[49],[53] 11,167,000 11,167,000 11,167,000 11,167,000 11,167,000 11,167,000 11,167,000            
Amortized Cost [31],[44],[49],[53] $ (9,100,000)                        
Fair Value [3],[31],[44],[49],[53] $ (4,900,000)                        
Investment, Identifier [Axis]: Borden Dairy Co                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[23],[26],[33],[43]               8.25% 8.25% 8.25% 8.25% 8.25% 8.25%
Base Rate Floor [23],[26],[33],[43]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[23],[26],[33],[43]               $ 65,000,000.0          
Amortized Cost [23],[26],[33],[43]               (25,400,000)          
Fair Value [4],[23],[26],[33],[43]               $ 0          
Investment, Identifier [Axis]: Bowery Farming Inc                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               10.00% 10.00% 10.00% 10.00% 10.00% 10.00%
Base Rate Floor [33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33]               $ 75,000,000.0          
Amortized Cost [33]               (74,300,000)          
Fair Value [4],[33]               $ (69,300,000)          
Investment, Identifier [Axis]: Bowery Farming Inc, Senior Secured Loans - First Lien, Food, Beverage & Tobacco                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 10.00% 10.00% 10.00% 10.00% 10.00% 10.00% 10.00%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13] $ 75,000,000.0                        
Amortized Cost [8] (74,400,000)                        
Fair Value [3],[8] $ (70,000,000.0)                        
Investment, Identifier [Axis]: Bowery Farming Inc, Warrants                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33]               161,828 161,828 161,828 161,828 161,828 161,828
Amortized Cost [26],[33]               $ (0.0)          
Fair Value [4],[26],[33]               $ (5,200,000)          
Investment, Identifier [Axis]: Bowery Farming Inc, Warrants, Equity/Other, Food, Beverage & Tobacco                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[31] 161,828 161,828 161,828 161,828 161,828 161,828 161,828            
Amortized Cost [8],[31] $ (0.0)                        
Fair Value [3],[8],[31] $ (3,000,000.0)                        
Investment, Identifier [Axis]: Bugaboo International BV | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               7.00% 7.00% 7.00% 7.00% 7.00% 7.00%
Interest rate, paid in kind               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Base Rate Floor               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount | €                     € 35.0    
Amortized Cost               $ (40,800,000)          
Fair Value               $ (39,800,000)          
Investment, Identifier [Axis]: Bugaboo International BV | Maximum | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind               780.00% 780.00% 780.00% 780.00% 780.00% 780.00%
Investment, Identifier [Axis]: Bugaboo International BV 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 7.00% 7.00% 7.00% 7.00% 7.00% 7.00% 7.00%            
Interest rate, paid in kind 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Base Rate Floor 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount | €       € 30.1                  
Amortized Cost $ (35,500,000)                        
Fair Value $ (29,400,000)                        
Investment, Identifier [Axis]: Bugaboo International BV 1 | Maximum | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind 7.80% 7.80% 7.80% 7.80% 7.80% 7.80% 7.80%            
Investment, Identifier [Axis]: Bugaboo International BV 2 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 7.00% 7.00% 7.00% 7.00% 7.00% 7.00% 7.00%            
Interest rate, paid in kind 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Base Rate Floor 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount | €       € 4.9                  
Amortized Cost $ (5,400,000)                        
Fair Value $ (4,800,000)                        
Investment, Identifier [Axis]: Bugaboo International BV 2 | Maximum | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind 7.80% 7.80% 7.80% 7.80% 7.80% 7.80% 7.80%            
Investment, Identifier [Axis]: Byrider Finance LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33],[54]               10.00% 10.00% 10.00% 10.00% 10.00% 10.00%
Interest rate, paid in kind [14],[33],[54]               0.50% 0.50% 0.50% 0.50% 0.50% 0.50%
Base Rate Floor [33],[54]               1.30% 1.30% 1.30% 1.30% 1.30% 1.30%
Principal amount [16],[33],[54]               $ 54,300,000          
Amortized Cost [33],[54]               (52,800,000)          
Fair Value [4],[33],[54]               $ (54,400,000)          
Investment, Identifier [Axis]: Byrider Finance LLC | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[33],[54]               0.50% 0.50% 0.50% 0.50% 0.50% 0.50%
Investment, Identifier [Axis]: Byrider Finance LLC, Senior Secured Loans -Second Lien, Automobiles & Components                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[7],[8],[28],[31] 16.00% 16.00% 16.00% 16.00% 16.00% 16.00% 16.00%            
Base Rate Floor [5],[7],[8],[28],[31] 1.30% 1.30% 1.30% 1.30% 1.30% 1.30% 1.30%            
Principal amount [7],[8],[13],[28],[31] $ 54,400,000                        
Amortized Cost [7],[8],[28],[31] (53,200,000)                        
Fair Value [3],[7],[8],[28],[31] $ (14,800,000)                        
Investment, Identifier [Axis]: Byrider Finance LLC, Structured Mezzanine                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               10.50% 10.50% 10.50% 10.50% 10.50% 10.50%
Base Rate Floor [15]               0.30% 0.30% 0.30% 0.30% 0.30% 0.30%
Principal amount [15]               $ 23,000,000.0          
Amortized Cost [15]               (23,000,000.0)          
Fair Value [4],[15]               $ (23,000,000.0)          
Investment, Identifier [Axis]: Byrider Finance LLC, Structured Mezzanine, Asset Based Finance, Automobiles & Components 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 10.50% 10.50% 10.50% 10.50% 10.50% 10.50% 10.50%            
Base Rate Floor [5],[8] 0.30% 0.30% 0.30% 0.30% 0.30% 0.30% 0.30%            
Principal amount [8],[13] $ 10,600,000                        
Amortized Cost [8] (10,600,000)                        
Fair Value [3],[8] $ (10,600,000)                        
Investment, Identifier [Axis]: Byrider Finance LLC, Structured Mezzanine, Asset Based Finance, Automobiles & Components 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 10.50% 10.50% 10.50% 10.50% 10.50% 10.50% 10.50%            
Base Rate Floor [5],[20] 0.30% 0.30% 0.30% 0.30% 0.30% 0.30% 0.30%            
Principal amount [13],[20] $ 12,400,000                        
Amortized Cost [20] (12,400,000)                        
Fair Value [3],[20] $ (12,300,000)                        
Investment, Identifier [Axis]: CDS US Intermediate Holdings Inc, Warrant                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[27],[33]               2,023,714 2,023,714 2,023,714 2,023,714 2,023,714 2,023,714
Amortized Cost [26],[27],[33]               $ 0          
Fair Value [4],[26],[27],[33]               $ 0          
Investment, Identifier [Axis]: CDS US Intermediate Holdings Inc, Warrant, Equity/Other, Media & Entertainment                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[9],[31],[39] 2,023,714 2,023,714 2,023,714 2,023,714 2,023,714 2,023,714 2,023,714            
Amortized Cost [8],[9],[31],[39] $ 0                        
Fair Value [3],[8],[9],[31],[39] $ (5,800,000)                        
Investment, Identifier [Axis]: CFC Underwriting Ltd, Senior Secured Loans - First Lien, Insurance 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Interest rate, paid in kind [5],[8],[9] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Base Rate Floor [5],[8],[9] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%            
Principal amount | € [8],[9],[13]       € 39.5                  
Amortized Cost [8],[9] $ (38,500,000)                        
Fair Value [3],[8],[9] $ (38,300,000)                        
Investment, Identifier [Axis]: CFC Underwriting Ltd, Senior Secured Loans - First Lien, Insurance 1 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[9] 2.80% 2.80% 2.80% 2.80% 2.80% 2.80% 2.80%            
Investment, Identifier [Axis]: CFC Underwriting Ltd, Senior Secured Loans - First Lien, Insurance 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[9],[20] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Interest rate, paid in kind [5],[9],[20] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Base Rate Floor [5],[9],[20] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount [9],[13],[20] $ 4,700,000                        
Amortized Cost [9],[20] (5,700,000)                        
Fair Value [3],[9],[20] $ (5,600,000)                        
Investment, Identifier [Axis]: CFC Underwriting Ltd, Senior Secured Loans - First Lien, Insurance 2 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[9],[20] 2.80% 2.80% 2.80% 2.80% 2.80% 2.80% 2.80%            
Investment, Identifier [Axis]: CSafe Global 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount $ 59,500,000             $ 60,000,000.0          
Amortized Cost (59,400,000)             (59,900,000)          
Fair Value $ (59,500,000)             $ (60,000,000.0)          
Investment, Identifier [Axis]: CSafe Global 2 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount $ 17,300,000             $ 17,500,000          
Amortized Cost (17,300,000)             (17,500,000)          
Fair Value $ (17,300,000)             $ (17,500,000)          
Investment, Identifier [Axis]: CSafe Global, Senior Secured Loans - First Lien, Capital Goods                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor [5],[8] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[13] $ 27,200,000                        
Amortized Cost [8] (36,000,000.0)                        
Fair Value [3],[8] $ (30,300,000)                        
Investment, Identifier [Axis]: CSafe Global, Senior Secured Loans - First Lien, Capital Goods 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[10],[11],[12],[21],[22],[42] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor [5],[8],[10],[11],[12],[21],[22],[42] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[10],[11],[12],[13],[21],[22],[42] $ 187,300,000                        
Amortized Cost [8],[10],[11],[12],[21],[22],[42] (181,800,000)                        
Fair Value [3],[8],[10],[11],[12],[21],[22],[42] $ (187,300,000)                        
Investment, Identifier [Axis]: CSafe Global, Senior Secured Loans - First Lien, Capital Goods 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor [5],[8] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[13] $ 11,800,000                        
Amortized Cost [8] (11,800,000)                        
Fair Value [3],[8] $ (11,800,000)                        
Investment, Identifier [Axis]: CSafe Global, Senior Secured Loans - First Lien, Capital Goods 4                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor [5],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [13],[20] $ 34,900,000                        
Amortized Cost [20] (34,900,000)                        
Fair Value [3],[20] $ (34,700,000)                        
Investment, Identifier [Axis]: CSafe Global, Senior Secured Loans—First Lien, Capital Goods, August 13, 2028                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor [33]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [16],[33]               $ 11,900,000          
Amortized Cost [33]               (11,900,000)          
Fair Value [4],[33]               $ (11,900,000)          
Investment, Identifier [Axis]: CSafe Global, Senior Secured Loans—First Lien, Capital Goods, December 23, 2026                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor [15]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [15],[16]               $ 34,900,000          
Amortized Cost [15]               (34,900,000)          
Fair Value [4],[15]               $ (34,600,000)          
Investment, Identifier [Axis]: CSafe Global, Senior Secured Loans—First Lien, Capital Goods, December 23, 2027 -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[17],[18],[19],[33],[40],[41],[45]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor [17],[18],[19],[33],[40],[41],[45]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [16],[17],[18],[19],[33],[40],[41],[45]               $ 188,700,000          
Amortized Cost [17],[18],[19],[33],[40],[41],[45]               (182,500,000)          
Fair Value [4],[17],[18],[19],[33],[40],[41],[45]               $ (188,700,000)          
Investment, Identifier [Axis]: CSafe Global, Senior Secured Loans—First Lien, Capital Goods, December 23, 2027 -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor [33]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount | £ [16],[33]                       £ 27.4  
Amortized Cost [33]               $ (36,300,000)          
Fair Value [4],[33]               $ (37,100,000)          
Investment, Identifier [Axis]: CTI Foods Holding Co LLC, Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33]               5,892 5,892 5,892 5,892 5,892 5,892
Amortized Cost [26],[33]               $ (700,000)          
Fair Value [4],[26],[33]               $ 0          
Investment, Identifier [Axis]: CTI Foods Holding Co LLC, Common Stock, Equity/Other, Food, Beverage & Tobacco                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[31] 5,892 5,892 5,892 5,892 5,892 5,892 5,892            
Amortized Cost [8],[31] $ (700,000)                        
Fair Value [3],[8],[31] $ 0                        
Investment, Identifier [Axis]: Caldic BV, Senior Secured Loans - First Lien, Retailing                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9],[39] 3.75% 3.75% 3.75% 3.75% 3.75% 3.75% 3.75%            
Base Rate Floor [5],[8],[9],[39] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%            
Principal amount [8],[9],[13],[39] $ 1,400,000                        
Amortized Cost [8],[9],[39] (1,400,000)                        
Fair Value [3],[8],[9],[39] $ (1,300,000)                        
Investment, Identifier [Axis]: Caldic BV, Senior Secured Loans - First Lien, Retailing 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9],[39] 3.50% 3.50% 3.50% 3.50% 3.50% 3.50% 3.50%            
Base Rate Floor [5],[8],[9],[39] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount [8],[9],[13],[39] $ 800,000                        
Amortized Cost [8],[9],[39] (900,000)                        
Fair Value [3],[8],[9],[39] $ (700,000)                        
Investment, Identifier [Axis]: Caldic BV, Senior Secured Loans -Second Lien, Retailing                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9] 7.25% 7.25% 7.25% 7.25% 7.25% 7.25% 7.25%            
Base Rate Floor [5],[8],[9] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%            
Principal amount [8],[9],[13] $ 40,000,000.0                        
Amortized Cost [8],[9] (39,000,000.0)                        
Fair Value [3],[8],[9] $ (38,400,000)                        
Investment, Identifier [Axis]: Callodine Commercial Finance LLC, 2L Term Loan A                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[33]               9.00% 9.00% 9.00% 9.00% 9.00% 9.00%
Base Rate Floor [33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [33]               $ 125,000,000.0          
Amortized Cost [33]               (118,000,000.0)          
Fair Value [4],[33]               $ (125,600,000)          
Investment, Identifier [Axis]: Callodine Commercial Finance LLC, 2L Term Loan A, Asset Based Finance, Diversified Financials                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 9.00% 9.00% 9.00% 9.00% 9.00% 9.00% 9.00%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13] $ 125,000,000.0                        
Amortized Cost [8] (119,000,000.0)                        
Fair Value [3],[8] $ (126,000,000.0)                        
Investment, Identifier [Axis]: Callodine Commercial Finance LLC, 2L Term Loan B                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[15]               9.00% 9.00% 9.00% 9.00% 9.00% 9.00%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15]               $ 40,300,000          
Amortized Cost [15]               (40,300,000)          
Fair Value [4],[15]               $ (40,500,000)          
Investment, Identifier [Axis]: Callodine Commercial Finance LLC, 2L Term Loan B, Asset Based Finance, Diversified Financials 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 9.00% 9.00% 9.00% 9.00% 9.00% 9.00% 9.00%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13] $ 12,000,000.0                        
Amortized Cost [8] (12,000,000.0)                        
Fair Value [3],[8] $ (12,100,000)                        
Investment, Identifier [Axis]: Callodine Commercial Finance LLC, 2L Term Loan B, Asset Based Finance, Diversified Financials 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 9.00% 9.00% 9.00% 9.00% 9.00% 9.00% 9.00%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[20] $ 36,100,000                        
Amortized Cost [20] (36,100,000)                        
Fair Value [3],[20] $ (36,300,000)                        
Investment, Identifier [Axis]: Capital Automotive LP, Private Equity                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [27],[33]               21,640,936 21,640,936 21,640,936 21,640,936 21,640,936 21,640,936
Amortized Cost [27],[33]               $ (23,700,000)          
Fair Value [4],[27],[33]               $ (28,100,000)          
Investment, Identifier [Axis]: Capital Automotive LP, Private Equity, Asset Based Finance, Real Estate                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[9] 21,640,936 21,640,936 21,640,936 21,640,936 21,640,936 21,640,936 21,640,936            
Amortized Cost [8],[9] $ (23,700,000)                        
Fair Value [3],[8],[9] $ (27,200,000)                        
Investment, Identifier [Axis]: Capital Automotive LP, Structured Mezzanine                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[27],[33]               11.00% 11.00% 11.00% 11.00% 11.00% 11.00%
Principal amount [27],[33]               $ 42,700,000          
Amortized Cost [27],[33]               (41,900,000)          
Fair Value [4],[27],[33]               $ (42,700,000)          
Investment, Identifier [Axis]: Capital Automotive LP, Structured Mezzanine, Asset Based Finance, Real Estate                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9] 11.00% 11.00% 11.00% 11.00% 11.00% 11.00% 11.00%            
Principal amount [8],[9],[13] $ 42,700,000                        
Amortized Cost [8],[9] (41,900,000)                        
Fair Value [3],[8],[9] $ (42,700,000)                        
Investment, Identifier [Axis]: Caprock Midstream LLC | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               4.75% 4.75% 4.75% 4.75% 4.75% 4.75%
Base Rate Floor               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount               $ 13,300,000          
Amortized Cost               (13,000,000.0)          
Fair Value               $ (13,200,000)          
Investment, Identifier [Axis]: Catalina Marketing Corp, Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33]               6,522 6,522 6,522 6,522 6,522 6,522
Amortized Cost [26],[33]               $ 0          
Fair Value [4],[26],[33]               $ 0          
Investment, Identifier [Axis]: Catalina Marketing Corp, Common Stock, Equity/Other, Media & Entertainment                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[31] 6,522 6,522 6,522 6,522 6,522 6,522 6,522            
Amortized Cost [8],[31] $ 0                        
Fair Value [3],[8],[31] $ 0                        
Investment, Identifier [Axis]: Cengage Learning, Inc, Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33]               227,802 227,802 227,802 227,802 227,802 227,802
Amortized Cost [26],[33]               $ (7,500,000)          
Fair Value [4],[26],[33]               $ (4,200,000)          
Investment, Identifier [Axis]: Cengage Learning, Inc, Common Stock, Equity/Other, Media & Entertainment                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[31] 227,802 227,802 227,802 227,802 227,802 227,802 227,802            
Amortized Cost [8],[31] $ (7,500,000)                        
Fair Value [3],[8],[31] $ (3,500,000)                        
Investment, Identifier [Axis]: Cimarron Energy Inc                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[23],[26],[33]               9.00% 9.00% 9.00% 9.00% 9.00% 9.00%
Base Rate Floor [23],[26],[33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[23],[26],[33]               $ 7,500,000          
Amortized Cost [23],[26],[33]               (5,500,000)          
Fair Value [4],[23],[26],[33]               $ (3,600,000)          
Investment, Identifier [Axis]: Cimarron Energy Inc, Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33]               4,302,293 4,302,293 4,302,293 4,302,293 4,302,293 4,302,293
Amortized Cost [26],[33]               $ 0          
Fair Value [4],[26],[33]               $ 0          
Investment, Identifier [Axis]: Cimarron Energy Inc, Common Stock, Equity/Other, Energy                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[31] 4,302,293 4,302,293 4,302,293 4,302,293 4,302,293 4,302,293 4,302,293            
Amortized Cost [8],[31] $ 0                        
Fair Value [3],[8],[31] $ 0                        
Investment, Identifier [Axis]: Cimarron Energy Inc, Participation Option                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33]               25,000,000 25,000,000 25,000,000 25,000,000 25,000,000 25,000,000
Amortized Cost [26],[33]               $ 0          
Fair Value [4],[26],[33]               $ 0          
Investment, Identifier [Axis]: Cimarron Energy Inc, Participation Option, Equity/Other, Energy                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[31] 25,000,000 25,000,000 25,000,000 25,000,000 25,000,000 25,000,000 25,000,000            
Amortized Cost [8],[31] $ 0                        
Fair Value [3],[8],[31] $ 0                        
Investment, Identifier [Axis]: Cimarron Energy Inc, Senior Secured Loans - First Lien, Energy                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[28],[31] 9.00% 9.00% 9.00% 9.00% 9.00% 9.00% 9.00%            
Base Rate Floor [5],[8],[28],[31] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13],[28],[31] $ 7,500,000                        
Amortized Cost [8],[28],[31] (5,000,000.0)                        
Fair Value [3],[8],[28],[31] $ (3,500,000)                        
Investment, Identifier [Axis]: Cision Ltd 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 3.75% 3.75% 3.75% 3.75% 3.75% 3.75% 3.75%            
Base Rate Floor 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount $ 3,800,000                        
Amortized Cost (3,400,000)                        
Fair Value $ (3,100,000)                        
Investment, Identifier [Axis]: Clarience Technologies LLC, Senior Secured Loans - First Lien, Capital Goods 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13] $ 1,800,000                        
Amortized Cost [8] (1,700,000)                        
Fair Value [3],[8] $ (1,800,000)                        
Investment, Identifier [Axis]: Clarience Technologies LLC, Senior Secured Loans - First Lien, Capital Goods 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[10],[11],[21],[37],[42] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor [5],[8],[10],[11],[21],[37],[42] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[10],[11],[13],[21],[37],[42] $ 294,700,000                        
Amortized Cost [8],[10],[11],[21],[37],[42] (284,900,000)                        
Fair Value [3],[8],[10],[11],[21],[37],[42] $ (292,100,000)                        
Investment, Identifier [Axis]: Clarience Technologies LLC, Senior Secured Loans - First Lien, Capital Goods 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[20] $ 23,600,000                        
Amortized Cost [20] (23,600,000)                        
Fair Value [3],[20] $ (23,400,000)                        
Investment, Identifier [Axis]: Clarience Technologies LLC, Senior Secured Loans—First Lien, Capital Goods, December 13, 2024                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 25,400,000          
Amortized Cost [15]               (25,200,000)          
Fair Value [4],[15]               $ (25,400,000)          
Investment, Identifier [Axis]: Clarience Technologies LLC, Senior Secured Loans—First Lien, Capital Goods, December 14, 2026                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[17],[19],[33],[35],[41],[45]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor [17],[19],[33],[35],[41],[45]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[17],[19],[33],[35],[41],[45]               $ 268,000,000.0          
Amortized Cost [17],[19],[33],[35],[41],[45]               (257,200,000)          
Fair Value [4],[17],[19],[33],[35],[41],[45]               $ (270,700,000)          
Investment, Identifier [Axis]: Clarience Technologies LLC, Senior Secured Loans—First Lien, Capital Goods, December 31, 2026 -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor [33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33]               $ 18,100,000          
Amortized Cost [33]               (17,600,000)          
Fair Value [4],[33]               $ (18,400,000)          
Investment, Identifier [Axis]: Clarience Technologies LLC, Senior Secured Loans—First Lien, Capital Goods, December 31, 2026 -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 10,800,000          
Amortized Cost [15]               (10,800,000)          
Fair Value [4],[15]               (11,100,000)          
Investment, Identifier [Axis]: ClubCorp Club Operations Inc                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Principal amount [16],[33],[38]               37,300,000          
Amortized Cost [33],[38]               (35,400,000)          
Fair Value [4],[33],[38]               $ (35,700,000)          
Investment, Identifier [Axis]: ClubCorp Club Operations Inc | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 2.75% 2.75% 2.75% 2.75% 2.75% 2.75% 2.75%            
Base Rate Floor 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount $ 32,000,000.0                        
Amortized Cost (29,900,000)                        
Fair Value $ (29,600,000)                        
Investment, Identifier [Axis]: Community Brands Inc, Senior Secured Loans - First Lien, Software & Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[8] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[13] $ 32,800,000                        
Amortized Cost [8] (32,200,000)                        
Fair Value [3],[8] $ (31,900,000)                        
Investment, Identifier [Axis]: Community Brands Inc, Senior Secured Loans - First Lien, Software & Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [13],[20] $ 3,900,000                        
Amortized Cost [20] (3,800,000)                        
Fair Value [3],[20] $ (3,800,000)                        
Investment, Identifier [Axis]: Community Brands Inc, Senior Secured Loans - First Lien, Software & Services 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [13],[20] $ 1,900,000                        
Amortized Cost [20] (1,900,000)                        
Fair Value [3],[20] $ (1,900,000)                        
Investment, Identifier [Axis]: Connecticut Avenue Securities Trust 2022-R08, Structured Mezzanine | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.60% 5.60% 5.60% 5.60% 5.60% 5.60% 5.60%            
Base Rate Floor 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount $ 2,300,000                        
Amortized Cost (2,300,000)                        
Fair Value $ (2,200,000)                        
Investment, Identifier [Axis]: Constellis Holdings LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33],[43],[45]               11.00% 11.00% 11.00% 11.00% 11.00% 11.00%
Interest rate, paid in kind [14],[33],[43],[45]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Base Rate Floor [33],[43],[45]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33],[43],[45]               $ 13,500,000          
Amortized Cost [33],[43],[45]               (12,500,000)          
Fair Value [4],[33],[43],[45]               $ (12,000,000.0)          
Investment, Identifier [Axis]: Constellis Holdings LLC | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[33],[43],[45]               10.00% 10.00% 10.00% 10.00% 10.00% 10.00%
Investment, Identifier [Axis]: Constellis Holdings LLC 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33],[43]               7.50% 7.50% 7.50% 7.50% 7.50% 7.50%
Base Rate Floor [33],[43]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33],[43]               $ 15,000,000.0          
Amortized Cost [33],[43]               (14,000,000.0)          
Fair Value [4],[33],[43]               $ (15,000,000.0)          
Investment, Identifier [Axis]: Constellis Holdings LLC, Private Equity                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33],[43],[45]               849,702 849,702 849,702 849,702 849,702 849,702
Amortized Cost [26],[33],[43],[45]               $ (10,300,000)          
Fair Value [4],[26],[33],[43],[45]               $ (200,000)          
Investment, Identifier [Axis]: Constellis Holdings LLC, Private Equity, Equity/Other, Capital Goods                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[21],[31],[44] 849,702 849,702 849,702 849,702 849,702 849,702 849,702            
Amortized Cost [8],[21],[31],[44] $ (10,300,000)                        
Fair Value [3],[8],[21],[31],[44] $ (5,900,000)                        
Investment, Identifier [Axis]: Constellis Holdings LLC, Senior Secured Loans - First Lien, Capital Goods                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[44] 7.50% 7.50% 7.50% 7.50% 7.50% 7.50% 7.50%            
Base Rate Floor [5],[8],[44] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13],[44] $ 15,000,000.0                        
Amortized Cost [8],[44] (14,300,000)                        
Fair Value [3],[8],[44] $ (15,000,000.0)                        
Investment, Identifier [Axis]: Constellis Holdings LLC, Senior Secured Loans -Second Lien, Capital Goods                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[44] 11.00% 11.00% 11.00% 11.00% 11.00% 11.00% 11.00%            
Interest rate, paid in kind [5],[8],[44] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Base Rate Floor [5],[8],[44] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13],[44] $ 13,500,000                        
Amortized Cost [8],[44] (12,700,000)                        
Fair Value [3],[8],[44] $ (13,500,000)                        
Investment, Identifier [Axis]: Constellis Holdings LLC, Senior Secured Loans -Second Lien, Capital Goods | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[44] 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%            
Investment, Identifier [Axis]: Corsearch Intermediate Inc, Senior Secured Loans - First Lien, Software & Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[42] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[8],[42] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13],[42] $ 30,100,000                        
Amortized Cost [8],[42] (28,500,000)                        
Fair Value [3],[8],[42] $ (29,800,000)                        
Investment, Identifier [Axis]: Corsearch Intermediate Inc, Senior Secured Loans - First Lien, Software & Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[20] $ 4,400,000                        
Amortized Cost [20] (4,400,000)                        
Fair Value [3],[20] $ (4,400,000)                        
Investment, Identifier [Axis]: Corsearch Intermediate Inc, Senior Secured Loans—First Lien, Software & Services -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33],[41]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Base Rate Floor [33],[41]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33],[41]               $ 30,100,000          
Amortized Cost [33],[41]               (28,300,000)          
Fair Value [4],[33],[41]               $ (30,100,000)          
Investment, Identifier [Axis]: Corsearch Intermediate Inc, Senior Secured Loans—First Lien, Software & Services -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 4,400,000          
Amortized Cost [15]               (4,400,000)          
Fair Value [4],[15]               $ (4,400,000)          
Investment, Identifier [Axis]: Creation Technologies Inc | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%            
Principal amount $ 2,300,000                        
Amortized Cost (2,100,000)                        
Fair Value (1,900,000)                        
Investment, Identifier [Axis]: Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Principal amount [8],[9],[13],[34] 1,637,300,000                        
Number of Shares | shares [27],[32],[33]               1,462 1,462 1,462 1,462 1,462 1,462
Amortized Cost (1,571,700,000) [8],[9],[34]             $ (1,396,700,000) [27],[32],[33]          
Fair Value $ (1,466,100,000) [3],[8],[9],[34]             $ (1,396,200,000) [4],[27],[32],[33]          
Investment, Identifier [Axis]: Cubic Corp                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               7.63% 7.63% 7.63% 7.63% 7.63% 7.63%
Base Rate Floor [33]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [16],[33]               $ 54,800,000          
Amortized Cost [33]               (51,800,000)          
Fair Value [4],[33]               $ (55,600,000)          
Investment, Identifier [Axis]: Cubic Corp | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 7.63% 7.63% 7.63% 7.63% 7.63% 7.63% 7.63%            
Base Rate Floor 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount $ 10,000,000.0                        
Amortized Cost (9,700,000)                        
Fair Value $ (9,200,000)                        
Investment, Identifier [Axis]: Cubic Corp 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 4.25% 4.25% 4.25% 4.25% 4.25% 4.25% 4.25% 4.25% 4.25% 4.25% 4.25% 4.25% 4.25%
Base Rate Floor 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount $ 9,100,000             $ 9,200,000          
Amortized Cost (9,100,000)             (9,200,000)          
Fair Value $ (8,000,000.0)             $ (9,200,000)          
Investment, Identifier [Axis]: Cubic Corp, Preferred Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[33]               11.00% 11.00% 11.00% 11.00% 11.00% 11.00%
Number of Shares | shares [33]               42,141,600 42,141,600 42,141,600 42,141,600 42,141,600 42,141,600
Amortized Cost [33]               $ (39,600,000)          
Fair Value [4],[33]               $ (42,300,000)          
Investment, Identifier [Axis]: Cubic Corp, Preferred Stock | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[33]               11.00% 11.00% 11.00% 11.00% 11.00% 11.00%
Investment, Identifier [Axis]: Cubic Corp, Preferred Stock, Equity/Other, Software & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8] 11.00% 11.00% 11.00% 11.00% 11.00% 11.00% 11.00%            
Number of Shares | shares [8] 42,141,600 42,141,600 42,141,600 42,141,600 42,141,600 42,141,600 42,141,600            
Amortized Cost [8] $ (39,700,000)                        
Fair Value [3],[8] $ (35,100,000)                        
Investment, Identifier [Axis]: Cubic Corp, Preferred Stock, Equity/Other, Software & Services | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8] 11.00% 11.00% 11.00% 11.00% 11.00% 11.00% 11.00%            
Investment, Identifier [Axis]: Cubic Corp, Senior Secured Loans -Second Lien, Software & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 7.63% 7.63% 7.63% 7.63% 7.63% 7.63% 7.63%            
Base Rate Floor [5],[8] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[13] $ 44,800,000                        
Amortized Cost [8] (42,100,000)                        
Fair Value [3],[8] $ (41,000,000.0)                        
Investment, Identifier [Axis]: Datatel Inc                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               8.00% 8.00% 8.00% 8.00% 8.00% 8.00%
Base Rate Floor [33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33]               $ 179,200,000          
Amortized Cost [33]               (170,100,000)          
Fair Value [4],[33]               $ (184,600,000)          
Investment, Identifier [Axis]: Dental Care Alliance Inc, Senior Secured Loans - First Lien, Health Care Equipment & Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[11],[21],[22],[42] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Base Rate Floor [5],[8],[11],[21],[22],[42] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[11],[13],[21],[22],[42] $ 131,300,000                        
Amortized Cost [8],[11],[21],[22],[42] (127,400,000)                        
Fair Value [3],[8],[11],[21],[22],[42] $ (129,500,000)                        
Investment, Identifier [Axis]: Dental Care Alliance Inc, Senior Secured Loans - First Lien, Health Care Equipment & Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Base Rate Floor [5],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount | £ [13],[20]         £ 6.1                
Amortized Cost [20] $ (6,100,000)                        
Fair Value [3],[20] $ (6,000,000.0)                        
Investment, Identifier [Axis]: Dental Care Alliance Inc, Senior Secured Loans—First Lien, Health Care Equipment & Services -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[17],[33],[40],[41],[45]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor [17],[33],[40],[41],[45]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [16],[17],[33],[40],[41],[45]               $ 90,300,000          
Amortized Cost [17],[33],[40],[41],[45]               (86,100,000)          
Fair Value [4],[17],[33],[40],[41],[45]               $ (90,400,000)          
Investment, Identifier [Axis]: Dental Care Alliance Inc, Senior Secured Loans—First Lien, Health Care Equipment & Services -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor [33]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [16],[33]               $ 8,700,000          
Amortized Cost [33]               (8,700,000)          
Fair Value [4],[33]               $ (8,700,000)          
Investment, Identifier [Axis]: Dental Care Alliance Inc, Senior Secured Loans—First Lien, Health Care Equipment & Services -3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor [15]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [15],[16]               $ 13,600,000          
Amortized Cost [15]               (13,600,000)          
Fair Value [4],[15]               $ (13,700,000)          
Investment, Identifier [Axis]: EIF Van Hook Holdings LLC | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%
Base Rate Floor 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount $ 7,700,000             $ 8,100,000          
Amortized Cost (7,400,000)             (7,800,000)          
Fair Value $ (7,400,000)             $ (7,800,000)          
Investment, Identifier [Axis]: EaglePicher Technologies LLC | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 7.25% 7.25% 7.25% 7.25% 7.25% 7.25% 7.25% 7.25% 7.25% 7.25% 7.25% 7.25% 7.25%
Base Rate Floor 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount $ 400,000             $ 400,000          
Amortized Cost (400,000)             (400,000)          
Fair Value $ (300,000)             $ (400,000)          
Investment, Identifier [Axis]: Eagleclaw Midstream Ventures LLC | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               4.25% 4.25% 4.25% 4.25% 4.25% 4.25%
Base Rate Floor               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount               $ 11,100,000          
Amortized Cost               (10,600,000)          
Fair Value               $ (11,100,000)          
Investment, Identifier [Axis]: Element Materials Technology Group US Holdings Inc                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[27],[33],[38]               3.50% 3.50% 3.50% 3.50% 3.50% 3.50%
Base Rate Floor [27],[33],[38]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[27],[33],[38]               $ 1,900,000          
Amortized Cost [27],[33],[38]               (1,900,000)          
Fair Value [4],[27],[33],[38]               $ (1,900,000)          
Investment, Identifier [Axis]: Element Materials Technology Group US Holdings Inc | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 7.25% 7.25% 7.25% 7.25% 7.25% 7.25% 7.25%            
Base Rate Floor 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%            
Principal amount | £         £ 16.0                
Amortized Cost $ (17,100,000)                        
Fair Value $ (17,200,000)                        
Investment, Identifier [Axis]: Element Materials Technology Group US Holdings Inc, Senior Secured Loans - First Lien, Commercial & Professional Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9],[39] 4.25% 4.25% 4.25% 4.25% 4.25% 4.25% 4.25%            
Base Rate Floor [5],[8],[9],[39] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount [8],[9],[13],[39] $ 300,000                        
Amortized Cost [8],[9],[39] (400,000)                        
Fair Value [3],[8],[9],[39] $ (300,000)                        
Investment, Identifier [Axis]: Element Materials Technology Group US Holdings Inc, Senior Secured Loans - First Lien, Commercial & Professional Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9],[39] 4.25% 4.25% 4.25% 4.25% 4.25% 4.25% 4.25%            
Base Rate Floor [5],[8],[9],[39] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%            
Principal amount [8],[9],[13],[39] $ 1,400,000                        
Amortized Cost [8],[9],[39] (1,400,000)                        
Fair Value [3],[8],[9],[39] $ (1,300,000)                        
Investment, Identifier [Axis]: Element Materials Technology Group US Holdings Inc, Senior Secured Loans -Second Lien, Commercial & Professional Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9] 7.25% 7.25% 7.25% 7.25% 7.25% 7.25% 7.25%            
Base Rate Floor [5],[8],[9] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%            
Principal amount [8],[9],[13] $ 5,000,000.0                        
Amortized Cost [8],[9] (5,700,000)                        
Fair Value [3],[8],[9] $ (5,300,000)                        
Investment, Identifier [Axis]: Element Materials Technology Group US Holdings Inc, Subordinated Debt, Commercial & Professional Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[9] 8.50% 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%            
Base Rate Floor [5],[8],[9] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%            
Principal amount [8],[9],[13] $ 65,900,000                        
Amortized Cost [8],[9] (64,400,000)                        
Fair Value [3],[8],[9] $ (63,200,000)                        
Investment, Identifier [Axis]: Element Materials Technology Group US Holdings Inc, Subordinated Debt, Commercial & Professional Services | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[9] 8.50% 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%            
Investment, Identifier [Axis]: Ellucian Inc, Senior Secured Loans -Second Lien, Software & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13] $ 179,200,000                        
Amortized Cost [8] (170,800,000)                        
Fair Value [3],[8] $ (178,100,000)                        
Investment, Identifier [Axis]: Emerald Expositions Holding Inc | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 2.75% 2.75% 2.75% 2.75% 2.75% 2.75% 2.75%            
Base Rate Floor 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount $ 1,700,000                        
Amortized Cost (1,600,000)                        
Fair Value $ (1,700,000)                        
Investment, Identifier [Axis]: Encora Digital Inc                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[33]               9.80% 9.80% 9.80% 9.80% 9.80% 9.80%
Principal amount [16],[33]               $ 21,600,000          
Amortized Cost [33]               (20,900,000)          
Fair Value [4],[33]               $ (20,900,000)          
Investment, Identifier [Axis]: Encora Digital Inc | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[33]               9.80% 9.80% 9.80% 9.80% 9.80% 9.80%
Investment, Identifier [Axis]: Encora Digital Inc 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Interest rate, paid in kind 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Base Rate Floor 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount $ 16,300,000                        
Amortized Cost (15,900,000)                        
Fair Value $ (15,500,000)                        
Investment, Identifier [Axis]: Encora Digital Inc 1 | Maximum | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind 2.40% 2.40% 2.40% 2.40% 2.40% 2.40% 2.40%            
Investment, Identifier [Axis]: Encora Digital Inc, Senior Secured Loans - First Lien, Software & Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Interest rate, paid in kind [5],[8] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Base Rate Floor [5],[8] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[13] $ 65,100,000                        
Amortized Cost [8] (63,900,000)                        
Fair Value [3],[8] $ (62,100,000)                        
Investment, Identifier [Axis]: Encora Digital Inc, Senior Secured Loans - First Lien, Software & Services 1 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8] 2.40% 2.40% 2.40% 2.40% 2.40% 2.40% 2.40%            
Investment, Identifier [Axis]: Encora Digital Inc, Senior Secured Loans - First Lien, Software & Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [13],[20] $ 19,600,000                        
Amortized Cost [20] (19,400,000)                        
Fair Value [3],[20] $ (18,700,000)                        
Investment, Identifier [Axis]: Encora Digital Inc, Senior Secured Loans—First Lien, Software & Services -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Interest rate, paid in kind [14],[33]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Base Rate Floor [33]               0.50% 0.50% 0.50% 0.50% 0.50% 0.50%
Principal amount [16],[33]               $ 81,300,000          
Amortized Cost [33]               (79,700,000)          
Fair Value [4],[33]               $ (79,700,000)          
Investment, Identifier [Axis]: Encora Digital Inc, Senior Secured Loans—First Lien, Software & Services -1 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[33]               2.40% 2.40% 2.40% 2.40% 2.40% 2.40%
Investment, Identifier [Axis]: Encora Digital Inc, Senior Secured Loans—First Lien, Software & Services -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Base Rate Floor [15]               0.50% 0.50% 0.50% 0.50% 0.50% 0.50%
Principal amount [15],[16]               $ 19,600,000          
Amortized Cost [15]               (19,400,000)          
Fair Value [4],[15]               $ (19,200,000)          
Investment, Identifier [Axis]: Encora Digital Inc, Subordinated Debt, Software & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8] 9.80% 9.80% 9.80% 9.80% 9.80% 9.80% 9.80%            
Principal amount | € [8],[13]       € 22.6                  
Amortized Cost [8] $ (22,000,000.0)                        
Fair Value [3],[8] $ (21,400,000)                        
Investment, Identifier [Axis]: Encora Digital Inc, Subordinated Debt, Software & Services | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8] 9.80% 9.80% 9.80% 9.80% 9.80% 9.80% 9.80%            
Investment, Identifier [Axis]: Entertainment Benefits Group LLC | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Interest rate, paid in kind               250.00% 250.00% 250.00% 250.00% 250.00% 250.00%
Base Rate Floor               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount               $ 2,600,000          
Amortized Cost               (2,600,000)          
Fair Value               $ (2,500,000)          
Investment, Identifier [Axis]: Entertainment Benefits Group LLC | Maximum | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind               250.00% 250.00% 250.00% 250.00% 250.00% 250.00%
Investment, Identifier [Axis]: Entertainment Benefits Group LLC, Senior Secured Loans—First Lien Media & Entertainment, September 30, 2024 -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Interest rate, paid in kind [14],[33]               2.50% 2.50% 2.50% 2.50% 2.50% 2.50%
Base Rate Floor [33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33]               $ 400,000          
Amortized Cost [33]               (400,000)          
Fair Value [4],[33]               $ (400,000)          
Investment, Identifier [Axis]: Entertainment Benefits Group LLC, Senior Secured Loans—First Lien Media & Entertainment, September 30, 2024 -1 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[33]               2.50% 2.50% 2.50% 2.50% 2.50% 2.50%
Investment, Identifier [Axis]: Entertainment Benefits Group LLC, Senior Secured Loans—First Lien Media & Entertainment, September 30, 2024 -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Interest rate, paid in kind [14],[15]               2.50% 2.50% 2.50% 2.50% 2.50% 2.50%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 10,200,000          
Amortized Cost [15]               (9,600,000)          
Fair Value [4],[15]               $ (9,900,000)          
Investment, Identifier [Axis]: Entertainment Benefits Group LLC, Senior Secured Loans—First Lien Media & Entertainment, September 30, 2024 -2 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[15]               2.50% 2.50% 2.50% 2.50% 2.50% 2.50%
Investment, Identifier [Axis]: Entertainment Benefits Group LLC, Senior Secured Loans—First Lien Media & Entertainment, September 30, 2025                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[17],[18],[33],[41],[45]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Interest rate, paid in kind [14],[17],[18],[33],[41],[45]               2.50% 2.50% 2.50% 2.50% 2.50% 2.50%
Base Rate Floor [17],[18],[33],[41],[45]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[17],[18],[33],[41],[45]               $ 64,000,000.0          
Amortized Cost [17],[18],[33],[41],[45]               (59,100,000)          
Fair Value [4],[17],[18],[33],[41],[45]               $ (61,700,000)          
Investment, Identifier [Axis]: Entertainment Benefits Group LLC, Senior Secured Loans—First Lien Media & Entertainment, September 30, 2025 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[17],[18],[33],[41],[45]               2.50% 2.50% 2.50% 2.50% 2.50% 2.50%
Investment, Identifier [Axis]: Envigo Laboratories Inc, Series A Warrant                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[35]               10,924 10,924 10,924 10,924 10,924 10,924
Amortized Cost [26],[35]               $ 0          
Fair Value [4],[26],[35]               $ 0          
Investment, Identifier [Axis]: Envigo Laboratories Inc, Series A Warrant, Equity/Other, Health Care Equipment & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [31],[37] 10,924 10,924 10,924 10,924 10,924 10,924 10,924            
Amortized Cost [31],[37] $ 0                        
Fair Value [3],[31],[37] $ 0                        
Investment, Identifier [Axis]: Envigo Laboratories Inc, Series B Warrant                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[35]               17,515 17,515 17,515 17,515 17,515 17,515
Amortized Cost [26],[35]               $ 0          
Fair Value [4],[26],[35]               $ 0          
Investment, Identifier [Axis]: Envigo Laboratories Inc, Series B Warrant, Equity/Other, Health Care Equipment & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [31],[37] 17,515 17,515 17,515 17,515 17,515 17,515 17,515            
Amortized Cost [31],[37] $ 0                        
Fair Value [3],[31],[37] $ 0                        
Investment, Identifier [Axis]: Envirotainer Ltd | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Interest rate, paid in kind 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Base Rate Floor 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount | €       € 14.9                  
Amortized Cost $ (13,900,000)                        
Fair Value $ (14,300,000)                        
Investment, Identifier [Axis]: Envirotainer Ltd | Maximum | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00%            
Investment, Identifier [Axis]: Envirotainer Ltd 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Interest rate, paid in kind 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Base Rate Floor 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount $ 7,600,000                        
Amortized Cost (7,400,000)                        
Fair Value $ (7,400,000)                        
Investment, Identifier [Axis]: Envirotainer Ltd 1 | Maximum | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00%            
Investment, Identifier [Axis]: Envirotainer Ltd, Senior Secured Loans - First Lien, Transportation                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[9],[20] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Interest rate, paid in kind [5],[9],[20] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Base Rate Floor [5],[9],[20] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount [9],[13],[20] $ 2,700,000                        
Amortized Cost [9],[20] (2,700,000)                        
Fair Value [3],[9],[20] $ (2,700,000)                        
Investment, Identifier [Axis]: Envirotainer Ltd, Senior Secured Loans - First Lien, Transportation | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[9],[20] 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00%            
Investment, Identifier [Axis]: Excelitas Technologies Corp | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 7.50% 7.50% 7.50% 7.50% 7.50% 7.50%
Base Rate Floor 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount $ 24,500,000             $ 22,600,000          
Amortized Cost (23,500,000)             (19,700,000)          
Fair Value $ (24,300,000)             $ (22,700,000)          
Investment, Identifier [Axis]: Excelitas Technologies Corp, Senior Secured Loans - First Lien, Technology Hardware & Equipment 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[8] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[13] $ 1,000,000.0                        
Amortized Cost [8] (1,000,000.0)                        
Fair Value [3],[8] $ (1,000,000.0)                        
Investment, Identifier [Axis]: Excelitas Technologies Corp, Senior Secured Loans - First Lien, Technology Hardware & Equipment 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[8] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount | € [8],[13]       € 4.1                  
Amortized Cost [8] $ (4,100,000)                        
Fair Value [3],[8] $ (3,900,000)                        
Investment, Identifier [Axis]: Excelitas Technologies Corp, Senior Secured Loans - First Lien, Technology Hardware & Equipment 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [13],[20] $ 1,400,000                        
Amortized Cost [20] (1,400,000)                        
Fair Value [3],[20] $ (1,400,000)                        
Investment, Identifier [Axis]: Excelitas Technologies Corp, Senior Secured Loans - First Lien, Technology Hardware & Equipment 4                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [13],[20] $ 4,700,000                        
Amortized Cost [20] (4,700,000)                        
Fair Value [3],[20] $ (4,700,000)                        
Investment, Identifier [Axis]: Fairway Group Holdings Corp                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[23],[26],[33],[43]               11.00% 11.00% 11.00% 11.00% 11.00% 11.00%
Principal amount [16],[23],[26],[33],[43]               $ 6,900,000          
Amortized Cost [23],[26],[33],[43]               0          
Fair Value [4],[23],[26],[33],[43]               $ 0          
Investment, Identifier [Axis]: Fairway Group Holdings Corp | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[23],[26],[33],[43]               11.00% 11.00% 11.00% 11.00% 11.00% 11.00%
Investment, Identifier [Axis]: Fairway Group Holdings Corp, Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33],[43]               103,091 103,091 103,091 103,091 103,091 103,091
Amortized Cost [26],[33],[43]               $ 0          
Fair Value [4],[26],[33],[43]               $ 0          
Investment, Identifier [Axis]: Fairway Group Holdings Corp, Senior Secured Loans—First Lien, Food & Staples Retailing, November 27, 2023                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[23],[26],[33],[43]               12.00% 12.00% 12.00% 12.00% 12.00% 12.00%
Principal amount [16],[23],[26],[33],[43]               $ 11,700,000          
Amortized Cost [23],[26],[33],[43]               (1,000,000.0)          
Fair Value [4],[23],[26],[33],[43]               $ (700,000)          
Investment, Identifier [Axis]: Fairway Group Holdings Corp, Senior Secured Loans—First Lien, Food & Staples Retailing, November 27, 2023 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[23],[26],[33],[43]               12.00% 12.00% 12.00% 12.00% 12.00% 12.00%
Investment, Identifier [Axis]: Fairway Group Holdings Corp, Senior Secured Loans—First Lien, Food & Staples Retailing, November 28, 2023                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[23],[26],[33],[43]               10.00% 10.00% 10.00% 10.00% 10.00% 10.00%
Principal amount [16],[23],[26],[33],[43]               $ 7,600,000          
Amortized Cost [23],[26],[33],[43]               0          
Fair Value [4],[23],[26],[33],[43]               $ 0          
Investment, Identifier [Axis]: Fairway Group Holdings Corp, Senior Secured Loans—First Lien, Food & Staples Retailing, November 28, 2023 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[23],[26],[33],[43]               10.00% 10.00% 10.00% 10.00% 10.00% 10.00%
Investment, Identifier [Axis]: Follett Software Co | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount               $ 37,900,000          
Amortized Cost               (37,500,000)          
Fair Value               $ (37,700,000)          
Investment, Identifier [Axis]: Follett Software Co 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount $ 37,600,000                        
Amortized Cost (37,300,000)                        
Fair Value $ (36,800,000)                        
Investment, Identifier [Axis]: Follett Software Co, Senior Secured Loans - First Lien, Software & Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[11],[12],[21],[22] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[11],[12],[21],[22] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [11],[12],[13],[21],[22] $ 73,900,000                        
Amortized Cost [11],[12],[21],[22] (73,200,000)                        
Fair Value [3],[11],[12],[21],[22] $ (72,300,000)                        
Investment, Identifier [Axis]: Follett Software Co, Senior Secured Loans - First Lien, Software & Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [13],[20] $ 9,900,000                        
Amortized Cost [20] (9,900,000)                        
Fair Value [3],[20] $ (9,700,000)                        
Investment, Identifier [Axis]: Follett Software Co, Senior Secured Loans—First Lien, Software & Services, August 31, 2027t 2027                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor [15]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [15],[16]               $ 9,900,000          
Amortized Cost [15]               (9,900,000)          
Fair Value [4],[15]               $ (9,800,000)          
Investment, Identifier [Axis]: Follett Software Co, Senior Secured Loans—First Lien, Software & Services, August 31, 2028                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor [17],[18],[40],[45]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [16],[17],[18],[40],[45]               $ 74,400,000          
Amortized Cost [17],[18],[40],[45]               (73,700,000)          
Fair Value [4],[17],[18],[40],[45]               $ (74,100,000)          
Investment, Identifier [Axis]: Foundation Consumer Brands LLC, Senior Secured Loans - First Lien, Pharmaceuticals, Biotechnology & Life Sciences 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[42] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[8],[42] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13],[42] $ 85,600,000                        
Amortized Cost [8],[42] (82,100,000)                        
Fair Value [3],[8],[42] $ (86,500,000)                        
Investment, Identifier [Axis]: Foundation Consumer Brands LLC, Senior Secured Loans - First Lien, Pharmaceuticals, Biotechnology & Life Sciences 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[20] $ 6,600,000                        
Amortized Cost [20] (6,600,000)                        
Fair Value [3],[20] $ (6,600,000)                        
Investment, Identifier [Axis]: Foundation Consumer Brands LLC, Senior Secured Loans—First Lien, Pharmaceuticals, Biotechnology & Life Sciences, February 12, 2027 -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33],[41]               6.38% 6.38% 6.38% 6.38% 6.38% 6.38%
Base Rate Floor [33],[41]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33],[41]               $ 97,100,000          
Amortized Cost [33],[41]               (93,000,000.0)          
Fair Value [4],[33],[41]               $ (98,000,000.0)          
Investment, Identifier [Axis]: Foundation Consumer Brands LLC, Senior Secured Loans—First Lien, Pharmaceuticals, Biotechnology & Life Sciences, February 12, 2027 -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               6.38% 6.38% 6.38% 6.38% 6.38% 6.38%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 6,600,000          
Amortized Cost [15]               (6,600,000)          
Fair Value [4],[15]               $ (6,600,000)          
Investment, Identifier [Axis]: Foundation Risk Partners Corp, Senior Secured Loans - First Lien, Insurance 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[8] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[13] $ 400,000                        
Amortized Cost [8] (300,000)                        
Fair Value [3],[8] $ (400,000)                        
Investment, Identifier [Axis]: Foundation Risk Partners Corp, Senior Secured Loans - First Lien, Insurance 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[8] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[13] $ 65,800,000                        
Amortized Cost [8] (64,900,000)                        
Fair Value [3],[8] $ (64,000,000.0)                        
Investment, Identifier [Axis]: Foundation Risk Partners Corp, Senior Secured Loans - First Lien, Insurance 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[8] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[13] $ 14,300,000                        
Amortized Cost [8] (14,200,000)                        
Fair Value [3],[8] $ (13,900,000)                        
Investment, Identifier [Axis]: Foundation Risk Partners Corp, Senior Secured Loans - First Lien, Insurance 4                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [13],[20] $ 6,600,000                        
Amortized Cost [20] (6,600,000)                        
Fair Value [3],[20] $ (6,400,000)                        
Investment, Identifier [Axis]: Foundation Risk Partners Corp, Senior Secured Loans—First Lien, Insurance, Maturing October 29, 2027                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor [15]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [15],[16]               $ 7,000,000.0          
Amortized Cost [15]               (6,900,000)          
Fair Value [4],[15]               $ (6,900,000)          
Investment, Identifier [Axis]: Foundation Risk Partners Corp, Senior Secured Loans—First Lien, Insurance, Maturing October 29, 2028 -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor [33]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [16],[33]               $ 74,300,000          
Amortized Cost [33]               (73,200,000)          
Fair Value [4],[33]               $ (73,300,000)          
Investment, Identifier [Axis]: Foundation Risk Partners Corp, Senior Secured Loans—First Lien, Insurance, Maturing October 29, 2028 -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor [15]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [15],[16]               $ 6,200,000          
Amortized Cost [15]               (6,200,000)          
Fair Value [4],[15]               $ (6,100,000)          
Investment, Identifier [Axis]: Fox Head Inc, Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33],[55]               10,000,000 10,000,000 10,000,000 10,000,000 10,000,000 10,000,000
Amortized Cost [26],[33],[55]               $ (8,000,000.0)          
Fair Value [4],[26],[33],[55]               $ (10,900,000)          
Investment, Identifier [Axis]: Fox Head Inc, Common Stock, Equity/Other, Consumer Durables & Apparel                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [6],[8] 10,000,000 10,000,000 10,000,000 10,000,000 10,000,000 10,000,000 10,000,000            
Amortized Cost [6],[8] $ (2,900,000)                        
Fair Value [3],[6],[8] $ (600,000)                        
Investment, Identifier [Axis]: Frontline Technologies Group LLC | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount $ 35,800,000             $ 19,700,000          
Amortized Cost (35,800,000)             (19,800,000)          
Fair Value $ (35,800,000)             $ (19,700,000)          
Investment, Identifier [Axis]: Frontline Technologies Group LLC, Senior Secured Loans - First Lien, Software & Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[10],[42] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[8],[10],[42] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[10],[13],[42] $ 22,900,000                        
Amortized Cost [8],[10],[42] (22,800,000)                        
Fair Value [3],[8],[10],[42] $ (22,900,000)                        
Investment, Identifier [Axis]: Frontline Technologies Group LLC, Senior Secured Loans - First Lien, Software & Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[37] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[37] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[37] $ 26,700,000                        
Amortized Cost [37] (25,800,000)                        
Fair Value [3],[37] $ (26,900,000)                        
Investment, Identifier [Axis]: Frontline Technologies Group LLC, Senior Secured Loans - First Lien, Software & Services 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13] $ 10,900,000                        
Amortized Cost [8] (10,500,000)                        
Fair Value [3],[8] $ (11,000,000.0)                        
Investment, Identifier [Axis]: Frontline Technologies Group LLC, Senior Secured Loans—First Lien, Software & Services -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[19],[33],[41]               5.25% 5.25% 5.25% 5.25% 5.25% 5.25%
Base Rate Floor [19],[33],[41]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[19],[33],[41]               $ 78,700,000          
Amortized Cost [19],[33],[41]               (78,100,000)          
Fair Value [4],[19],[33],[41]               $ (78,700,000)          
Investment, Identifier [Axis]: Frontline Technologies Group LLC, Senior Secured Loans—First Lien, Software & Services -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33],[35]               5.25% 5.25% 5.25% 5.25% 5.25% 5.25%
Base Rate Floor [33],[35]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33],[35]               $ 75,600,000          
Amortized Cost [33],[35]               (71,700,000)          
Fair Value [4],[33],[35]               $ (76,200,000)          
Investment, Identifier [Axis]: Fronton BV, Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[43],[56]               14,943 14,943 14,943 14,943 14,943 14,943
Amortized Cost [26],[43],[56]               $ 0          
Fair Value [4],[26],[43],[56]               $ (1,400,000)          
Investment, Identifier [Axis]: Fronton BV, Common Stock, Equity/Other, Consumer Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [31],[44],[57] 14,943 14,943 14,943 14,943 14,943 14,943 14,943            
Amortized Cost [31],[44],[57] $ 0                        
Fair Value [3],[31],[44],[57] (1,100,000)                        
Investment, Identifier [Axis]: GA Capital Specialty Lending Fund, Limited Partnership Interest | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares               1 1 1 1 1 1
Amortized Cost               $ 0          
Fair Value               $ (4,500,000)          
Investment, Identifier [Axis]: GA Capital Specialty Lending Fund, Limited Partnership Interest | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Principal amount 1,000,000.0                        
Amortized Cost 0                        
Fair Value $ (4,800,000)                        
Investment, Identifier [Axis]: Galaxy Universal LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               5.00% 5.00% 5.00% 5.00% 5.00% 5.00%
Base Rate Floor [33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33]               $ 36,200,000          
Amortized Cost [33]               (35,800,000)          
Fair Value [4],[33]               $ (35,800,000)          
Investment, Identifier [Axis]: Galaxy Universal LLC | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%            
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount $ 8,800,000                        
Amortized Cost (8,800,000)                        
Fair Value $ (8,800,000)                        
Investment, Identifier [Axis]: Galaxy Universal LLC, Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33]               228,806 228,806 228,806 228,806 228,806 228,806
Amortized Cost [26],[33]               $ (35,500,000)          
Fair Value [4],[26],[33]               $ (35,500,000)          
Investment, Identifier [Axis]: Galaxy Universal LLC, Common Stock, Equity/Other, Consumer Durables & Apparel                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [31],[53] 228,806 228,806 228,806 228,806 228,806 228,806 228,806            
Amortized Cost [31],[53] $ (35,500,000)                        
Fair Value [3],[31],[53] $ (14,900,000)                        
Investment, Identifier [Axis]: Galaxy Universal LLC, Senior Secured Loans - First Lien, Consumer Durables & Apparel 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[8] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount [8],[13] $ 7,500,000                        
Amortized Cost [8] (7,500,000)                        
Fair Value [3],[8] $ (7,500,000)                        
Investment, Identifier [Axis]: Galaxy Universal LLC, Senior Secured Loans - First Lien, Consumer Durables & Apparel 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13] $ 88,300,000                        
Amortized Cost [8] (88,300,000)                        
Fair Value [3],[8] $ (86,800,000)                        
Investment, Identifier [Axis]: Galaxy Universal LLC, Senior Secured Loans - First Lien, Consumer Durables & Apparel 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13] $ 22,500,000                        
Amortized Cost [8] (22,300,000)                        
Fair Value [3],[8] $ (22,300,000)                        
Investment, Identifier [Axis]: Galaxy Universal LLC, Senior Secured Loans—First Lien, Consumer Durables & Apparel, Maturing February 4,2022 -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               5.00% 5.00% 5.00% 5.00% 5.00% 5.00%
Principal amount [16],[33]               $ 900,000          
Amortized Cost [33]               (900,000)          
Fair Value [4],[33]               $ (900,000)          
Investment, Identifier [Axis]: Galaxy Universal LLC, Senior Secured Loans—First Lien, Consumer Durables & Apparel, Maturing February 4,2022 -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               5.00% 5.00% 5.00% 5.00% 5.00% 5.00%
Principal amount [15],[16]               $ 7,700,000          
Amortized Cost [15]               (7,700,000)          
Fair Value [4],[15]               $ (7,700,000)          
Investment, Identifier [Axis]: Galaxy Universal LLC, Senior Secured Loans—First Lien, Consumer Durables & Apparel, November 1, 2026                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor [33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33]               $ 88,900,000          
Amortized Cost [33]               (88,900,000)          
Fair Value [4],[33]               $ (88,900,000)          
Investment, Identifier [Axis]: Galaxy Universal LLC, Trade Claim                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33]               27,256,114 27,256,114 27,256,114 27,256,114 27,256,114 27,256,114
Amortized Cost [26],[33]               $ (16,400,000)          
Fair Value [4],[26],[33]               $ (16,400,000)          
Investment, Identifier [Axis]: Galaxy Universal LLC, Trade Claim, Equity/Other, Consumer Durables & Apparel                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[31] 6,723,167 6,723,167 6,723,167 6,723,167 6,723,167 6,723,167 6,723,167            
Amortized Cost [8],[31] $ (4,000,000.0)                        
Fair Value [3],[8],[31] $ (1,500,000)                        
Investment, Identifier [Axis]: Galway Partners Holdings LLC | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%
Interest rate, paid in kind 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Base Rate Floor 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount $ 37,000,000.0             $ 20,300,000          
Amortized Cost (36,200,000)             (20,000,000.0)          
Fair Value $ (36,400,000)             $ (20,000,000.0)          
Investment, Identifier [Axis]: Galway Partners Holdings LLC | Maximum | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind 1.30% 1.30% 1.30% 1.30% 1.30% 1.30% 1.30% 130.00% 130.00% 130.00% 130.00% 130.00% 130.00%
Investment, Identifier [Axis]: Galway Partners Holdings LLC, Senior Secured Loans - First Lien, Insurance 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[11],[12],[22],[42] 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%            
Interest rate, paid in kind [5],[8],[11],[12],[22],[42] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Base Rate Floor [5],[8],[11],[12],[22],[42] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[11],[12],[13],[22],[42] $ 105,600,000                        
Amortized Cost [8],[11],[12],[22],[42] (103,800,000)                        
Fair Value [3],[8],[11],[12],[22],[42] $ (103,800,000)                        
Investment, Identifier [Axis]: Galway Partners Holdings LLC, Senior Secured Loans - First Lien, Insurance 1 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[11],[12],[22],[42] 1.30% 1.30% 1.30% 1.30% 1.30% 1.30% 1.30%            
Investment, Identifier [Axis]: Galway Partners Holdings LLC, Senior Secured Loans - First Lien, Insurance 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%            
Interest rate, paid in kind [5],[20] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Base Rate Floor [5],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [13],[20] $ 12,000,000.0                        
Amortized Cost [20] (11,800,000)                        
Fair Value [3],[20] $ (11,800,000)                        
Investment, Identifier [Axis]: Galway Partners Holdings LLC, Senior Secured Loans - First Lien, Insurance 2 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[20] 1.30% 1.30% 1.30% 1.30% 1.30% 1.30% 1.30%            
Investment, Identifier [Axis]: Galway Partners Holdings LLC, Senior Secured Loans - First Lien, Insurance 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%            
Interest rate, paid in kind [5],[20] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Base Rate Floor [5],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [13],[20] $ 7,100,000                        
Amortized Cost [20] (7,100,000)                        
Fair Value [3],[20] $ (7,000,000.0)                        
Investment, Identifier [Axis]: Galway Partners Holdings LLC, Senior Secured Loans - First Lien, Insurance 3 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[20] 1.30% 1.30% 1.30% 1.30% 1.30% 1.30% 1.30%            
Investment, Identifier [Axis]: Galway Partners Holdings LLC, Senior Secured Loans—First Lien, Insurance, Maturing September 29, 2028 -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[17],[18],[33],[40]               5.25% 5.25% 5.25% 5.25% 5.25% 5.25%
Interest rate, paid in kind [14],[17],[18],[33],[40]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Base Rate Floor [17],[18],[33],[40]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [16],[17],[18],[33],[40]               $ 128,100,000          
Amortized Cost [17],[18],[33],[40]               (125,500,000)          
Fair Value [4],[17],[18],[33],[40]               $ (126,000,000.0)          
Investment, Identifier [Axis]: Galway Partners Holdings LLC, Senior Secured Loans—First Lien, Insurance, Maturing September 29, 2028 -1 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[17],[18],[33],[40]               1.30% 1.30% 1.30% 1.30% 1.30% 1.30%
Investment, Identifier [Axis]: Galway Partners Holdings LLC, Senior Secured Loans—First Lien, Insurance, Maturing September 29, 2028 -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[15]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Base Rate Floor [15]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [15],[16]               $ 22,400,000          
Amortized Cost [15]               (22,400,000)          
Fair Value [4],[15]               $ (22,000,000.0)          
Investment, Identifier [Axis]: Galway Partners Holdings LLC, Senior Secured Loans—First Lien, Insurance, Maturing September 29, 2028 -2 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[15]               1.30% 1.30% 1.30% 1.30% 1.30% 1.30%
Investment, Identifier [Axis]: Galway Partners Holdings LLC, Senior Secured Loans—First Lien, Insurance, Maturing September 30, 2027                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               5.25% 5.25% 5.25% 5.25% 5.25% 5.25%
Interest rate, paid in kind [14],[15]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Base Rate Floor [15]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [15],[16]               $ 12,000,000.0          
Amortized Cost [15]               (11,700,000)          
Fair Value [4],[15]               $ (11,800,000)          
Investment, Identifier [Axis]: Galway Partners Holdings LLC, Senior Secured Loans—First Lien, Insurance, Maturing September 30, 2027 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[15]               1.30% 1.30% 1.30% 1.30% 1.30% 1.30%
Investment, Identifier [Axis]: General Datatech LP                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[17],[18],[33],[40],[41],[45]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor [17],[18],[33],[40],[41],[45]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[17],[18],[33],[40],[41],[45]               $ 169,100,000          
Amortized Cost [17],[18],[33],[40],[41],[45]               (167,500,000)          
Fair Value [4],[17],[18],[33],[40],[41],[45]               $ (166,500,000)          
Investment, Identifier [Axis]: General Datatech LP | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount $ 18,400,000                        
Amortized Cost (17,800,000)                        
Fair Value $ (17,400,000)                        
Investment, Identifier [Axis]: General Datatech LP 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount               $ 10,200,000          
Amortized Cost               (10,000,000.0)          
Fair Value               $ (10,000,000.0)          
Investment, Identifier [Axis]: General Datatech LP, Senior Secured Loans - First Lien, Software & Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[11],[12],[21],[22],[42] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor [5],[8],[11],[12],[21],[22],[42] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[11],[12],[13],[21],[22],[42] $ 157,400,000                        
Amortized Cost [8],[11],[12],[21],[22],[42] (156,100,000)                        
Fair Value [3],[8],[11],[12],[21],[22],[42] $ (148,700,000)                        
Investment, Identifier [Axis]: Genesys Telecommunications Laboratories Inc, Class A Shares                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33]               40,529 40,529 40,529 40,529 40,529 40,529
Amortized Cost [26],[33]               $ 0          
Fair Value [4],[26],[33]               $ 0          
Investment, Identifier [Axis]: Genesys Telecommunications Laboratories Inc, Class A Shares, Equity/Other, Technology Hardware & Equipment                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8] 40,529 40,529 40,529 40,529 40,529 40,529 40,529            
Amortized Cost [8] $ 0                        
Fair Value [3],[8] $ 0                        
Investment, Identifier [Axis]: Genesys Telecommunications Laboratories Inc, Ordinary Shares                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33]               41,339 41,339 41,339 41,339 41,339 41,339
Amortized Cost [26],[33]               $ 0          
Fair Value [4],[26],[33]               $ 0          
Investment, Identifier [Axis]: Genesys Telecommunications Laboratories Inc, Ordinary Shares, Equity/Other, Technology Hardware & Equipment                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [31] 41,339 41,339 41,339 41,339 41,339 41,339 41,339            
Amortized Cost [31] $ 0                        
Fair Value [3],[31] $ 0                        
Investment, Identifier [Axis]: Genesys Telecommunications Laboratories Inc, Preferred Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33]               1,050,465 1,050,465 1,050,465 1,050,465 1,050,465 1,050,465
Amortized Cost [26],[33]               $ 0          
Fair Value [4],[26],[33]               $ 0          
Investment, Identifier [Axis]: Genesys Telecommunications Laboratories Inc, Preferred Stock, Equity/Other, Technology Hardware & Equipment                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [31] 1,050,465 1,050,465 1,050,465 1,050,465 1,050,465 1,050,465 1,050,465            
Amortized Cost [31] $ 0                        
Fair Value [3],[31] $ 0                        
Investment, Identifier [Axis]: Gigamon Inc, Senior Secured Loans - First Lien, Health Care Equipment & Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13] $ 25,900,000                        
Amortized Cost [8] (26,800,000)                        
Fair Value [3],[8] $ (23,600,000)                        
Investment, Identifier [Axis]: Gigamon Inc, Senior Secured Loans - First Lien, Health Care Equipment & Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8] 12.00% 12.00% 12.00% 12.00% 12.00% 12.00% 12.00%            
Principal amount [8],[13] $ 22,200,000                        
Amortized Cost [8] (22,800,000)                        
Fair Value [3],[8] $ (15,900,000)                        
Investment, Identifier [Axis]: Gigamon Inc, Senior Secured Loans - First Lien, Health Care Equipment & Services 2 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8] 12.00% 12.00% 12.00% 12.00% 12.00% 12.00% 12.00%            
Investment, Identifier [Axis]: Gigamon Inc, Senior Secured Loans - First Lien, Software & Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[8] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[13] $ 170,900,000                        
Amortized Cost [8] (169,300,000)                        
Fair Value [3],[8] $ (165,300,000)                        
Investment, Identifier [Axis]: Gigamon Inc, Senior Secured Loans - First Lien, Software & Services 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [13],[20] $ 9,300,000                        
Amortized Cost [20] (9,300,000)                        
Fair Value [3],[20] $ (9,000,000.0)                        
Investment, Identifier [Axis]: Global Jet Capital LLC, Preferred Stock, Asset Based Finance, Commercial & Professional Services -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33],[54],[55]               149,494,590 149,494,590 149,494,590 149,494,590 149,494,590 149,494,590
Amortized Cost [26],[33],[54],[55]               $ (69,400,000)          
Fair Value [4],[26],[33],[54],[55]               $ 0          
Investment, Identifier [Axis]: Global Jet Capital LLC, Preferred Stock, Asset Based Finance, Commercial & Professional Services -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[33],[54],[55]               9.00% 9.00% 9.00% 9.00% 9.00% 9.00%
Principal amount [16],[33],[54],[55]               $ 414,000,000.0          
Amortized Cost [33],[54],[55]               (304,800,000)          
Fair Value [4],[33],[54],[55]               $ (302,200,000)          
Investment, Identifier [Axis]: Global Jet Capital LLC, Preferred Stock, Asset Based Finance, Commercial & Professional Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[6],[7],[8],[28],[31] 9.00% 9.00% 9.00% 9.00% 9.00% 9.00% 9.00%            
Number of Shares | shares [6],[7],[8],[31] 149,494,590 149,494,590 149,494,590 149,494,590 149,494,590 149,494,590 149,494,590            
Amortized Cost [6],[7],[8],[31] $ (69,400,000)                        
Fair Value [3],[6],[7],[8],[31] $ 0                        
Investment, Identifier [Axis]: Global Jet Capital LLC, Preferred Stock, Asset Based Finance, Commercial & Professional Services 1 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[6],[7],[8],[28],[31] 9.00% 9.00% 9.00% 9.00% 9.00% 9.00% 9.00%            
Investment, Identifier [Axis]: Global Jet Capital LLC, Preferred Stock, Asset Based Finance, Commercial & Professional Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Principal amount [6],[7],[8],[13],[28],[31] $ 442,900,000                        
Amortized Cost [6],[7],[8],[28],[31] (309,400,000)                        
Fair Value [3],[6],[7],[8],[28],[31] $ (232,000,000.0)                        
Investment, Identifier [Axis]: Global Jet Capital LLC, Structured Mezzanine, Asset Based Finance, Commercial & Professional Services -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[27],[33],[54],[55]               15.00% 15.00% 15.00% 15.00% 15.00% 15.00%
Principal amount [16],[27],[33],[54],[55]               $ 53,600,000          
Amortized Cost [27],[33],[54],[55]               (36,900,000)          
Fair Value [4],[27],[33],[54],[55]               $ (53,600,000)          
Investment, Identifier [Axis]: Global Jet Capital LLC, Structured Mezzanine, Asset Based Finance, Commercial & Professional Services -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[27],[33],[54],[55]               15.00% 15.00% 15.00% 15.00% 15.00% 15.00%
Principal amount [16],[27],[33],[54],[55]               $ 39,200,000          
Amortized Cost [27],[33],[54],[55]               (26,900,000)          
Fair Value [4],[27],[33],[54],[55]               $ (39,200,000)          
Investment, Identifier [Axis]: Global Jet Capital LLC, Structured Mezzanine, Asset Based Finance, Commercial & Professional Services -3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[27],[33],[54],[55]               15.00% 15.00% 15.00% 15.00% 15.00% 15.00%
Principal amount [16],[27],[33],[54],[55]               $ 4,600,000          
Amortized Cost [27],[33],[54],[55]               (3,100,000)          
Fair Value [4],[27],[33],[54],[55]               $ (4,600,000)          
Investment, Identifier [Axis]: Global Jet Capital LLC, Structured Mezzanine, Asset Based Finance, Commercial & Professional Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[6],[7],[8],[9] 15.00% 15.00% 15.00% 15.00% 15.00% 15.00% 15.00%            
Principal amount [6],[7],[8],[9],[13] $ 27,000,000.0                        
Amortized Cost [6],[7],[8],[9] (20,200,000)                        
Fair Value [3],[6],[7],[8],[9] $ (27,000,000.0)                        
Investment, Identifier [Axis]: Global Jet Capital LLC, Structured Mezzanine, Asset Based Finance, Commercial & Professional Services 1 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[6],[7],[8],[9] 15.00% 15.00% 15.00% 15.00% 15.00% 15.00% 15.00%            
Investment, Identifier [Axis]: Global Jet Capital LLC, Structured Mezzanine, Asset Based Finance, Commercial & Professional Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[6],[7],[8],[9] 15.00% 15.00% 15.00% 15.00% 15.00% 15.00% 15.00%            
Principal amount [6],[7],[8],[9],[13] $ 19,800,000                        
Amortized Cost [6],[7],[8],[9] (14,400,000)                        
Fair Value [3],[6],[7],[8],[9] $ (19,800,000)                        
Investment, Identifier [Axis]: Global Jet Capital LLC, Structured Mezzanine, Asset Based Finance, Commercial & Professional Services 2 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[6],[7],[8],[9] 15.00% 15.00% 15.00% 15.00% 15.00% 15.00% 15.00%            
Investment, Identifier [Axis]: Global Jet Capital LLC, Structured Mezzanine, Asset Based Finance, Commercial & Professional Services 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Principal amount [6],[7],[8],[9],[13] $ 2,300,000                        
Amortized Cost [6],[7],[8],[9] (1,600,000)                        
Fair Value [3],[6],[7],[8],[9] $ (2,300,000)                        
Investment, Identifier [Axis]: Global Lending Services LLC, Asset Based Finance, Diversified Financials -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [27],[33]               12,222,437 12,222,437 12,222,437 12,222,437 12,222,437 12,222,437
Amortized Cost [27],[33]               $ (14,200,000)          
Fair Value [4],[27],[33]               $ (15,500,000)          
Investment, Identifier [Axis]: Global Lending Services LLC, Asset Based Finance, Diversified Financials -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [27],[33]               22,352,639 22,352,639 22,352,639 22,352,639 22,352,639 22,352,639
Amortized Cost [27],[33]               $ (24,200,000)          
Fair Value [4],[27],[33]               $ (28,500,000)          
Investment, Identifier [Axis]: Global Lending Services LLC, Private Equity | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares               3,653,142 3,653,142 3,653,142 3,653,142 3,653,142 3,653,142
Amortized Cost               $ (3,700,000)          
Fair Value               $ (4,600,000)          
Investment, Identifier [Axis]: Global Lending Services LLC, Private Equity 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares 2,577,072 2,577,072 2,577,072 2,577,072 2,577,072 2,577,072 2,577,072            
Amortized Cost $ (2,600,000)                        
Fair Value $ (2,700,000)                        
Investment, Identifier [Axis]: Global Lending Services LLC, Private Equity 2 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares 19,329,296 19,329,296 19,329,296 19,329,296 19,329,296 19,329,296 19,329,296            
Amortized Cost $ (25,400,000)                        
Fair Value $ (20,300,000)                        
Investment, Identifier [Axis]: Global Lending Services LLC, Private Equity, Asset Based Finance, Diversified Financials 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[9] 8,622,196 8,622,196 8,622,196 8,622,196 8,622,196 8,622,196 8,622,196            
Amortized Cost [8],[9] $ (10,000,000.0)                        
Fair Value [3],[8],[9] $ (9,200,000)                        
Investment, Identifier [Axis]: Global Lending Services LLC, Private Equity, Asset Based Finance, Diversified Financials 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[9] 11,471,468 11,471,468 11,471,468 11,471,468 11,471,468 11,471,468 11,471,468            
Amortized Cost [8],[9] $ (11,500,000)                        
Fair Value [3],[8],[9] $ (12,000,000.0)                        
Investment, Identifier [Axis]: Global Lending Services LLC, Private Equity, Asset Based Finance, Diversified Financials 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[9],[44] 3,736,989 3,736,989 3,736,989 3,736,989 3,736,989 3,736,989 3,736,989            
Amortized Cost [8],[9],[44] $ (3,700,000)                        
Fair Value [3],[8],[9],[44] $ (3,700,000)                        
Investment, Identifier [Axis]: Gracent LLC, NP-1 Common Stock, Equity/Other, Health Care Equipment & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [31],[53] 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000            
Amortized Cost [31],[53] $ (4,200,000)                        
Fair Value [3],[31],[53] $ 0                        
Investment, Identifier [Axis]: Greystone Equity Member Corp                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[27],[33]               7.25% 7.25% 7.25% 7.25% 7.25% 7.25%
Base Rate Floor [27],[33]               3.80% 3.80% 3.80% 3.80% 3.80% 3.80%
Principal amount [16],[27],[33]               $ 194,800,000          
Amortized Cost [27],[33]               (182,700,000)          
Fair Value [4],[27],[33]               $ (192,600,000)          
Investment, Identifier [Axis]: Greystone Equity Member Corp 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 7.25% 7.25% 7.25% 7.25% 7.25% 7.25% 7.25% 7.25% 7.25% 7.25% 7.25% 7.25% 7.25%
Base Rate Floor 3.80% 3.80% 3.80% 3.80% 3.80% 3.80% 3.80% 3.80% 3.80% 3.80% 3.80% 3.80% 3.80%
Principal amount $ 30,200,000             $ 30,200,000          
Amortized Cost (30,000,000.0)             (30,000,000.0)          
Fair Value $ (29,300,000)             $ (29,900,000)          
Investment, Identifier [Axis]: Greystone Equity Member Corp, Senior Secured Loans - First Lien, Diversified Financials                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9] 7.25% 7.25% 7.25% 7.25% 7.25% 7.25% 7.25%            
Base Rate Floor [5],[8],[9] 3.80% 3.80% 3.80% 3.80% 3.80% 3.80% 3.80%            
Principal amount [8],[9],[13] $ 194,800,000                        
Amortized Cost [8],[9] (184,400,000)                        
Fair Value [3],[8],[9] $ (188,900,000)                        
Investment, Identifier [Axis]: HKA, Senior Secured Loans - First Lien, Commercial & Professional Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Interest rate, paid in kind [5],[8],[9] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Base Rate Floor [5],[8],[9] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%            
Principal amount [8],[9],[13] $ 3,500,000                        
Amortized Cost [8],[9] (3,400,000)                        
Fair Value [3],[8],[9] $ (3,400,000)                        
Investment, Identifier [Axis]: HKA, Senior Secured Loans - First Lien, Commercial & Professional Services 1 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[9] 1.80% 1.80% 1.80% 1.80% 1.80% 1.80% 1.80%            
Investment, Identifier [Axis]: HKA, Senior Secured Loans - First Lien, Commercial & Professional Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[9],[20] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Interest rate, paid in kind [5],[9],[20] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Base Rate Floor [5],[9],[20] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%            
Principal amount [9],[13],[20] $ 1,100,000                        
Amortized Cost [9],[20] (1,100,000)                        
Fair Value [3],[9],[20] $ (1,100,000)                        
Investment, Identifier [Axis]: HKA, Senior Secured Loans - First Lien, Commercial & Professional Services 2 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[9],[20] 1.80% 1.80% 1.80% 1.80% 1.80% 1.80% 1.80%            
Investment, Identifier [Axis]: HM Dunn Co Inc, Preferred Stock, Series A                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[32],[33],[35]               85,385 85,385 85,385 85,385 85,385 85,385
Amortized Cost [26],[32],[33],[35]               $ (7,100,000)          
Fair Value [4],[26],[32],[33],[35]               $ (7,100,000)          
Investment, Identifier [Axis]: HM Dunn Co Inc, Preferred Stock, Series A, Equity/Other, Capital Goods                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[31],[34],[37] 85,385 85,385 85,385 85,385 85,385 85,385 85,385            
Amortized Cost [8],[31],[34],[37] $ (7,100,000)                        
Fair Value [3],[8],[31],[34],[37] $ (10,900,000)                        
Investment, Identifier [Axis]: HM Dunn Co Inc, Preferred Stock, Series B                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[32],[33],[35]               15,000 15,000 15,000 15,000 15,000 15,000
Amortized Cost [26],[32],[33],[35]               $ 0          
Fair Value [4],[26],[32],[33],[35]               $ 0          
Investment, Identifier [Axis]: HM Dunn Co Inc, Preferred Stock, Series B, Equity/Other, Capital Goods                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[31],[34],[37] 15,000 15,000 15,000 15,000 15,000 15,000 15,000            
Amortized Cost [8],[31],[34],[37] $ 0                        
Fair Value [3],[8],[31],[34],[37] $ 0                        
Investment, Identifier [Axis]: HM Dunn Co Inc, Senior Secured Loans - First Lien, Capital Goods 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[34] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Base Rate Floor [5],[8],[34] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13],[34] $ 35,600,000                        
Amortized Cost [8],[34] (35,600,000)                        
Fair Value [3],[8],[34] $ (35,600,000)                        
Investment, Identifier [Axis]: HM Dunn Co Inc, Senior Secured Loans - First Lien, Capital Goods 1 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[34] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Investment, Identifier [Axis]: HM Dunn Co Inc, Senior Secured Loans - First Lien, Capital Goods 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20],[34] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Base Rate Floor [5],[20],[34] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount | € [13],[20],[34]       € 2.0                  
Amortized Cost [20],[34] $ (2,000,000.0)                        
Fair Value [3],[20],[34] $ (2,000,000.0)                        
Investment, Identifier [Axis]: HM Dunn Co Inc, Senior Secured Loans—First Lien, Capital Goods -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[32],[33]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Base Rate Floor [32],[33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[32],[33]               $ 33,600,000          
Amortized Cost [32],[33]               (33,600,000)          
Fair Value [4],[32],[33]               $ (33,600,000)          
Investment, Identifier [Axis]: HM Dunn Co Inc, Senior Secured Loans—First Lien, Capital Goods -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[32],[33]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Base Rate Floor [32],[33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[32],[33]               $ 2,000,000.0          
Amortized Cost [32],[33]               (2,000,000.0)          
Fair Value [4],[32],[33]               $ (2,000,000.0)          
Investment, Identifier [Axis]: Harvey Industries Inc, Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [33]               5,000,000 5,000,000 5,000,000 5,000,000 5,000,000 5,000,000
Amortized Cost [33]               $ (2,200,000)          
Fair Value [4],[33]               $ (3,300,000)          
Investment, Identifier [Axis]: Harvey Industries Inc, Common Stock, Equity/Other, Capital Goods                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8] 5,000,000 5,000,000 5,000,000 5,000,000 5,000,000 5,000,000 5,000,000            
Amortized Cost [8] $ (2,200,000)                        
Fair Value [3],[8] $ (4,500,000)                        
Investment, Identifier [Axis]: HealthChannels LLC | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 4.50% 4.50% 4.50% 4.50% 4.50% 4.50% 4.50% 4.50% 4.50% 4.50% 4.50% 4.50% 4.50%
Base Rate Floor 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount $ 15,500,000             $ 15,600,000          
Amortized Cost (15,400,000)             (15,500,000)          
Fair Value $ (13,100,000)             $ (14,300,000)          
Investment, Identifier [Axis]: Heniff Transportation Systems LLC, Senior Secured Loans - First Lien, Transportation 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13] $ 6,500,000                        
Amortized Cost [8] (6,300,000)                        
Fair Value [3],[8] $ (6,300,000)                        
Investment, Identifier [Axis]: Heniff Transportation Systems LLC, Senior Secured Loans - First Lien, Transportation 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13] $ 19,200,000                        
Amortized Cost [8] (18,500,000)                        
Fair Value [3],[8] $ (18,900,000)                        
Investment, Identifier [Axis]: Heniff Transportation Systems LLC, Senior Secured Loans - First Lien, Transportation 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[20] $ 11,300,000                        
Amortized Cost [20] (11,300,000)                        
Fair Value [3],[20] $ (10,900,000)                        
Investment, Identifier [Axis]: Heniff Transportation Systems LLC, Senior Secured Loans - First Lien, Transportation 4                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[10],[11],[12],[21],[42] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[8],[10],[11],[12],[21],[42] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[10],[11],[12],[13],[21],[42] $ 136,600,000                        
Amortized Cost [8],[10],[11],[12],[21],[42] (130,400,000)                        
Fair Value [3],[8],[10],[11],[12],[21],[42] $ (131,900,000)                        
Investment, Identifier [Axis]: Heniff Transportation Systems LLC, Senior Secured Loans—First Lien, Transportation, Maturing December 3 2024 -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor [33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33]               $ 5,900,000          
Amortized Cost [33]               (5,600,000)          
Fair Value [4],[33]               $ (5,600,000)          
Investment, Identifier [Axis]: Heniff Transportation Systems LLC, Senior Secured Loans—First Lien, Transportation, Maturing December 3 2024 -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 11,900,000          
Amortized Cost [15]               (11,900,000)          
Fair Value [4],[15]               $ (11,100,000)          
Investment, Identifier [Axis]: Heniff Transportation Systems LLC, Senior Secured Loans—First Lien, Transportation, Maturing December 3 2026 -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[17],[18],[19],[33],[41],[45]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor [17],[18],[19],[33],[41],[45]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[17],[18],[19],[33],[41],[45]               $ 137,700,000          
Amortized Cost [17],[18],[19],[33],[41],[45]               (130,500,000)          
Fair Value [4],[17],[18],[19],[33],[41],[45]               $ (128,700,000)          
Investment, Identifier [Axis]: Heniff Transportation Systems LLC, Senior Secured Loans—First Lien, Transportation, Maturing December 3 2026 -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor [33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33]               $ 19,400,000          
Amortized Cost [33]               (18,600,000)          
Fair Value [4],[33]               $ (18,500,000)          
Investment, Identifier [Axis]: Hermes UK Ltd | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%
Base Rate Floor 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount | £         £ 14.7             £ 14.7  
Amortized Cost $ (19,500,000)             $ (19,500,000)          
Fair Value $ (15,300,000)             $ (19,300,000)          
Investment, Identifier [Axis]: Hibu Inc, Senior Secured Loans - First Lien, Commercial & Professional Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[11],[12],[21],[22],[42] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor [5],[8],[11],[12],[21],[22],[42] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[11],[12],[13],[21],[22],[42] $ 99,600,000                        
Amortized Cost [8],[11],[12],[21],[22],[42] (95,300,000)                        
Fair Value [3],[8],[11],[12],[21],[22],[42] $ (100,900,000)                        
Investment, Identifier [Axis]: Higginbotham Insurance Agency Inc | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Base Rate Floor 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount $ 37,700,000             $ 38,000,000.0          
Amortized Cost (38,100,000)             (38,400,000)          
Fair Value $ (37,800,000)             $ (38,800,000)          
Investment, Identifier [Axis]: Higginbotham Insurance Agency Inc, Insurance -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Base Rate Floor [33]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [16],[33]               $ 25,300,000          
Amortized Cost [33]               (24,600,000)          
Fair Value [4],[33]               $ (25,800,000)          
Investment, Identifier [Axis]: Higginbotham Insurance Agency Inc, Insurance -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               5.25% 5.25% 5.25% 5.25% 5.25% 5.25%
Base Rate Floor [33]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [16],[33]               $ 4,500,000          
Amortized Cost [33]               (4,300,000)          
Fair Value [4],[33]               $ (4,600,000)          
Investment, Identifier [Axis]: Higginbotham Insurance Agency Inc, Insurance -3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               5.25% 5.25% 5.25% 5.25% 5.25% 5.25%
Base Rate Floor [15]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [15],[16]               $ 32,600,000          
Amortized Cost [15]               (32,600,000)          
Fair Value [4],[15]               $ (33,300,000)          
Investment, Identifier [Axis]: Higginbotham Insurance Agency Inc, Senior Secured Loans - First Lien, Insurance 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[8] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[13] $ 1,400,000                        
Amortized Cost [8] (1,400,000)                        
Fair Value [3],[8] $ (1,400,000)                        
Investment, Identifier [Axis]: Higginbotham Insurance Agency Inc, Senior Secured Loans - First Lien, Insurance 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%            
Base Rate Floor [5],[8] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[13] $ 7,000,000.0                        
Amortized Cost [8] (6,600,000)                        
Fair Value [3],[8] $ (7,000,000.0)                        
Investment, Identifier [Axis]: Higginbotham Insurance Agency Inc, Senior Secured Loans - First Lien, Insurance 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [13],[20] $ 8,900,000                        
Amortized Cost [20] (8,900,000)                        
Fair Value [3],[20] $ (9,000,000.0)                        
Investment, Identifier [Axis]: Hilding Anders                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[23],[26],[27],[32],[33]               13.00% 13.00% 13.00% 13.00% 13.00% 13.00%
Investment, Identifier [Axis]: Hilding Anders | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[23],[26],[27],[32],[33]               13.00% 13.00% 13.00% 13.00% 13.00% 13.00%
Investment, Identifier [Axis]: Hilding Anders, Class A Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[27],[32],[33]               4,503,411 4,503,411 4,503,411 4,503,411 4,503,411 4,503,411
Amortized Cost [26],[27],[32],[33]               $ (100,000)          
Fair Value [4],[26],[27],[32],[33]               $ 0          
Investment, Identifier [Axis]: Hilding Anders, Class A Common Stock, Equity/Other, Consumer Durables & Apparel                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[9],[31],[34] 4,503,411 4,503,411 4,503,411 4,503,411 4,503,411 4,503,411 4,503,411            
Amortized Cost [8],[9],[31],[34] $ (100,000)                        
Fair Value [3],[8],[9],[31],[34] $ 0                        
Investment, Identifier [Axis]: Hilding Anders, Class B Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[27],[32],[33]               574,791 574,791 574,791 574,791 574,791 574,791
Amortized Cost [26],[27],[32],[33]               $ (0.0)          
Fair Value [4],[26],[27],[32],[33]               $ 0          
Investment, Identifier [Axis]: Hilding Anders, Class B Common Stock, Equity/Other, Consumer Durables & Apparel                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[9],[31],[34] 574,791 574,791 574,791 574,791 574,791 574,791 574,791            
Amortized Cost [8],[9],[31],[34] $ (0.0)                        
Fair Value [3],[8],[9],[31],[34] $ 0                        
Investment, Identifier [Axis]: Hilding Anders, Class C Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[27],[32],[33]               213,201 213,201 213,201 213,201 213,201 213,201
Amortized Cost [26],[27],[32],[33]               $ 0          
Fair Value [4],[26],[27],[32],[33]               $ 0          
Investment, Identifier [Axis]: Hilding Anders, Class C Common Stock, Equity/Other, Consumer Durables & Apparel                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[9],[31],[34] 213,201 213,201 213,201 213,201 213,201 213,201 213,201            
Amortized Cost [8],[9],[31],[34] $ 0                        
Fair Value [3],[8],[9],[31],[34] $ 0                        
Investment, Identifier [Axis]: Hilding Anders, Equity Options                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[27],[32],[33]               236,160,807 236,160,807 236,160,807 236,160,807 236,160,807 236,160,807
Amortized Cost [26],[27],[32],[33]               $ (15,000,000.0)          
Fair Value [4],[26],[27],[32],[33]               0          
Investment, Identifier [Axis]: Hilding Anders, Equity Options, Equity/Other, Consumer Durables & Apparel                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[9],[31],[34] 236,160,807 236,160,807 236,160,807 236,160,807 236,160,807 236,160,807 236,160,807            
Amortized Cost [8],[9],[31],[34] $ (15,000,000.0)                        
Fair Value [3],[8],[9],[31],[34] 0                        
Investment, Identifier [Axis]: Hilding Anders, Subordinated Debt, Consumer Durables & Apparel - 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Principal amount [16],[23],[26],[27],[32],[33]               134,400,000          
Amortized Cost [23],[26],[27],[32],[33]               (99,400,000)          
Fair Value [4],[23],[26],[27],[32],[33]               (46,600,000)          
Investment, Identifier [Axis]: Hilding Anders, Subordinated Debt, Consumer Durables & Apparel -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Principal amount | € [16],[26],[27],[32],[33]                     € 24.8    
Amortized Cost [26],[27],[32],[33]               (26,900,000)          
Fair Value [4],[26],[27],[32],[33]               0          
Investment, Identifier [Axis]: Hilding Anders, Subordinated Debt, Consumer Durables & Apparel -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Principal amount [16],[26],[27],[32],[33]               110,500,000          
Amortized Cost [26],[27],[32],[33]               0          
Fair Value [4],[26],[27],[32],[33]               $ 0          
Investment, Identifier [Axis]: Hilding Anders, Subordinated Debt, Consumer Durables & Apparel 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Principal amount | € [8],[9],[13],[31],[34]       € 135.2                  
Amortized Cost [8],[9],[31],[34] (26,900,000)                        
Fair Value [3],[8],[9],[31],[34] $ 0                        
Investment, Identifier [Axis]: Hilding Anders, Subordinated Debt, Consumer Durables & Apparel 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[9],[28],[31],[34] 13.00% 13.00% 13.00% 13.00% 13.00% 13.00% 13.00%            
Principal amount [8],[9],[13],[28],[31],[34] $ 143,200,000                        
Amortized Cost [8],[9],[28],[31],[34] (99,400,000)                        
Fair Value [3],[8],[9],[28],[31],[34] $ 0                        
Investment, Identifier [Axis]: Hilding Anders, Subordinated Debt, Consumer Durables & Apparel 2 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[9],[28],[31],[34] 13.00% 13.00% 13.00% 13.00% 13.00% 13.00% 13.00%            
Investment, Identifier [Axis]: Home Partners JV 2, , Asset Based Finance, Real Estate -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[27],[33],[43]               1,585,353 1,585,353 1,585,353 1,585,353 1,585,353 1,585,353
Amortized Cost [26],[27],[33],[43]               $ (1,500,000)          
Fair Value [4],[26],[27],[33],[43]               $ (1,600,000)          
Investment, Identifier [Axis]: Home Partners JV 2, , Asset Based Finance, Real Estate -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[27],[33],[43]               59,815 59,815 59,815 59,815 59,815 59,815
Amortized Cost [26],[27],[33],[43]               $ (100,000)          
Fair Value [4],[26],[27],[33],[43]               $ (100,000)          
Investment, Identifier [Axis]: Home Partners JV 2, Private Equity, Asset Based Finance, Real Estate 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[9],[44] 4,471,509 4,471,509 4,471,509 4,471,509 4,471,509 4,471,509 4,471,509            
Amortized Cost [8],[9],[44] $ (4,400,000)                        
Fair Value [3],[8],[9],[44] $ (5,200,000)                        
Investment, Identifier [Axis]: Home Partners JV 2, Private Equity, Asset Based Finance, Real Estate 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[9],[44] 168,710 168,710 168,710 168,710 168,710 168,710 168,710            
Amortized Cost [8],[9],[44] $ (200,000)                        
Fair Value [3],[8],[9],[44] $ (200,000)                        
Investment, Identifier [Axis]: Home Partners JV 2, Structured Mezzanine, Asset Based Finance, Real Estate                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[9],[44] 11.00% 11.00% 11.00% 11.00% 11.00% 11.00% 11.00%            
Principal amount [8],[9],[13],[44] $ 10,000,000.0                        
Amortized Cost [8],[9],[44] (10,000,000.0)                        
Fair Value [3],[8],[9],[44] $ (10,000,000.0)                        
Investment, Identifier [Axis]: Home Partners JV 2, Structured Mezzanine, Asset Based Finance, Real Estate | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[9],[44] 11.00% 11.00% 11.00% 11.00% 11.00% 11.00% 11.00%            
Investment, Identifier [Axis]: Home Partners JV 2, Structured Mezzanine, Asset Based Finance, Real Estate -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[27],[33],[43]               11.00% 11.00% 11.00% 11.00% 11.00% 11.00%
Principal amount [16],[27],[33],[43]               $ 3,500,000          
Amortized Cost [27],[33],[43]               (3,400,000)          
Fair Value [4],[27],[33],[43]               $ (3,500,000)          
Investment, Identifier [Axis]: Home Partners JV 2, Structured Mezzanine, Asset Based Finance, Real Estate -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[15],[27],[43]               11.00% 11.00% 11.00% 11.00% 11.00% 11.00%
Principal amount [15],[16],[27],[43]               $ 13,600,000          
Amortized Cost [15],[27],[43]               (13,600,000)          
Fair Value [4],[15],[27],[43]               $ (13,600,000)          
Investment, Identifier [Axis]: Home Partners JV, Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[27],[33],[43]               32,659,547 32,659,547 32,659,547 32,659,547 32,659,547 32,659,547
Amortized Cost [26],[27],[33],[43]               $ (47,600,000)          
Fair Value [4],[26],[27],[33],[43]               $ (80,600,000)          
Investment, Identifier [Axis]: Home Partners JV, Common Stock 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares               15,249,687 15,249,687 15,249,687 15,249,687 15,249,687 15,249,687
Amortized Cost               $ (22,900,000)          
Fair Value               $ (37,600,000)          
Investment, Identifier [Axis]: Home Partners JV, Private Equity                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[27],[33],[43]               4,127,355 4,127,355 4,127,355 4,127,355 4,127,355 4,127,355
Amortized Cost [26],[27],[33],[43]               $ (5,400,000)          
Fair Value [4],[26],[27],[33],[43]               $ (9,400,000)          
Investment, Identifier [Axis]: Home Partners JV, Structured Mezzanine                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[27],[33],[43]               11.00% 11.00% 11.00% 11.00% 11.00% 11.00%
Principal amount [16],[27],[33],[43]               $ 90,400,000          
Amortized Cost [27],[33],[43]               (85,600,000)          
Fair Value [4],[27],[33],[43]               $ (90,400,000)          
Investment, Identifier [Axis]: Home Partners JV, Structured Mezzanine 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind               1100.00% 1100.00% 1100.00% 1100.00% 1100.00% 1100.00%
Principal amount               $ 38,400,000          
Amortized Cost               (38,400,000)          
Fair Value               $ (38,400,000)          
Investment, Identifier [Axis]: Home Partners JV, Structured Mezzanine 1 | Maximum | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind               1100.00% 1100.00% 1100.00% 1100.00% 1100.00% 1100.00%
Investment, Identifier [Axis]: Hudson Technologies Co                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[27],[33]               10.25% 10.25% 10.25% 10.25% 10.25% 10.25%
Base Rate Floor [27],[33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[27],[33]               $ 79,900,000          
Amortized Cost [27],[33]               (72,300,000)          
Fair Value [4],[27],[33]               $ (82,100,000)          
Investment, Identifier [Axis]: Imagine Communications Corp, Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33]               33,034 33,034 33,034 33,034 33,034 33,034
Amortized Cost [26],[33]               $ (3,800,000)          
Fair Value [4],[26],[33]               $ (2,500,000)          
Investment, Identifier [Axis]: Imagine Communications Corp, Common Stock, Equity/Other, Media & Entertainment                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[31] 33,034 33,034 33,034 33,034 33,034 33,034 33,034            
Amortized Cost [8],[31] $ (3,800,000)                        
Fair Value [3],[8],[31] $ (2,500,000)                        
Investment, Identifier [Axis]: Individual FoodService, Senior Secured Loans - First Lien, Capital Goods 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[37],[42] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor [5],[37],[42] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[37],[42] $ 69,600,000                        
Amortized Cost [37],[42] (66,000,000.0)                        
Fair Value [3],[37],[42] $ (69,400,000)                        
Investment, Identifier [Axis]: Individual FoodService, Senior Secured Loans - First Lien, Capital Goods 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13] $ 5,300,000                        
Amortized Cost [8] (5,200,000)                        
Fair Value [3],[8] $ (5,200,000)                        
Investment, Identifier [Axis]: Individual FoodService, Senior Secured Loans - First Lien, Capital Goods 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[42] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor [5],[8],[42] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13],[42] $ 16,800,000                        
Amortized Cost [8],[42] (16,800,000)                        
Fair Value [3],[8],[42] $ (16,700,000)                        
Investment, Identifier [Axis]: Individual FoodService, Senior Secured Loans - First Lien, Capital Goods 4                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13] $ 4,000,000.0                        
Amortized Cost [8] (4,000,000.0)                        
Fair Value [3],[8] $ (4,000,000.0)                        
Investment, Identifier [Axis]: Individual FoodService, Senior Secured Loans - First Lien, Capital Goods 5                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13] $ 8,000,000.0                        
Amortized Cost [8] (8,000,000.0)                        
Fair Value [3],[8] $ (8,000,000.0)                        
Investment, Identifier [Axis]: Individual FoodService, Senior Secured Loans - First Lien, Capital Goods 6                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[20] $ 4,800,000                        
Amortized Cost [20] (4,700,000)                        
Fair Value [3],[20] $ (4,700,000)                        
Investment, Identifier [Axis]: Individual FoodService, Senior Secured Loans - First Lien, Capital Goods 7                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[20] $ 1,800,000                        
Amortized Cost [20] (1,800,000)                        
Fair Value [3],[20] $ (1,800,000)                        
Investment, Identifier [Axis]: Individual FoodService, Senior Secured Loans—First Lien, Capital Goods , Maturing November 22, 2024 -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor [33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33]               $ 200,000          
Amortized Cost [33]               (200,000)          
Fair Value [4],[33]               $ (200,000)          
Investment, Identifier [Axis]: Individual FoodService, Senior Secured Loans—First Lien, Capital Goods , Maturing November 22, 2024 -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 4,500,000          
Amortized Cost [15]               (4,500,000)          
Fair Value [4],[15]               $ (4,500,000)          
Investment, Identifier [Axis]: Individual FoodService, Senior Secured Loans—First Lien, Capital Goods , Maturing November 22, 2025 - 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor [15]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount [15],[16]               $ 5,600,000          
Amortized Cost [15]               (5,600,000)          
Fair Value [4],[15]               $ (5,700,000)          
Investment, Identifier [Axis]: Individual FoodService, Senior Secured Loans—First Lien, Capital Goods , Maturing November 22, 2025 -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33],[35],[41]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor [33],[35],[41]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33],[35],[41]               $ 90,800,000          
Amortized Cost [33],[35],[41]               (86,500,000)          
Fair Value [4],[33],[35],[41]               $ (91,700,000)          
Investment, Identifier [Axis]: Industria Chimica Emiliana Srl                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[27],[33]               7.25% 7.25% 7.25% 7.25% 7.25% 7.25%
Base Rate Floor [27],[33]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount | € [16],[27],[33]                     € 88.8    
Amortized Cost [27],[33]               $ (101,300,000)          
Fair Value [4],[27],[33]               $ (103,900,000)          
Investment, Identifier [Axis]: Industria Chimica Emiliana Srl | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 7.25% 7.25% 7.25% 7.25% 7.25% 7.25% 7.25%            
Base Rate Floor 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount | €       € 113.9                  
Amortized Cost $ (125,300,000)                        
Fair Value $ (109,900,000)                        
Investment, Identifier [Axis]: Industria Chimica Emiliana Srl 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               7.25% 7.25% 7.25% 7.25% 7.25% 7.25%
Base Rate Floor               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount | €                     € 113.9    
Amortized Cost               $ (125,000,000.0)          
Fair Value               $ (133,300,000)          
Investment, Identifier [Axis]: Industria Chimica Emiliana Srl, Senior Secured Loans - First Lien, Pharmaceuticals, Biotechnology & Life Sciences                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9] 7.25% 7.25% 7.25% 7.25% 7.25% 7.25% 7.25%            
Base Rate Floor [5],[8],[9] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount [8],[9],[13] $ 88,800,000                        
Amortized Cost [8],[9] (101,900,000)                        
Fair Value [3],[8],[9] $ (85,600,000)                        
Investment, Identifier [Axis]: Industry City TI Lessor LP                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33],[35]               10.80% 10.80% 10.80% 10.80% 10.80% 10.80%
Interest rate, paid in kind [14],[33],[35]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33],[35]               $ 29,900,000          
Amortized Cost [33],[35]               (30,000,000.0)          
Fair Value [4],[33],[35]               $ (32,500,000)          
Investment, Identifier [Axis]: Industry City TI Lessor LP | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[33],[35]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Investment, Identifier [Axis]: Industry City TI Lessor LP, Senior Secured Loans - First Lien, Consumer Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[37] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13],[37] $ 26,700,000                        
Amortized Cost [8],[37] (26,800,000)                        
Fair Value [3],[8],[37] $ (27,500,000)                        
Investment, Identifier [Axis]: Industry City TI Lessor LP, Senior Secured Loans - First Lien, Consumer Services | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[37] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Investment, Identifier [Axis]: Insight Global LLC | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Base Rate Floor 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount $ 63,900,000             $ 37,900,000          
Amortized Cost (63,100,000)             (37,500,000)          
Fair Value $ (62,900,000)             $ (37,400,000)          
Investment, Identifier [Axis]: Insight Global LLC, Senior Secured Loans - First Lien, Commercial & Professional Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[10] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Base Rate Floor [5],[8],[10] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[10],[13] $ 203,800,000                        
Amortized Cost [8],[10] (202,000,000.0)                        
Fair Value [3],[8],[10] $ (200,700,000)                        
Investment, Identifier [Axis]: Insight Global LLC, Senior Secured Loans - First Lien, Commercial & Professional Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Base Rate Floor [5],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [13],[20] $ 21,100,000                        
Amortized Cost [20] (21,100,000)                        
Fair Value [3],[20] $ (20,700,000)                        
Investment, Identifier [Axis]: Insight Global LLC, Senior Secured Loans - First Lien, Commercial & Professional Services 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Base Rate Floor [5],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [13],[20] $ 26,800,000                        
Amortized Cost [20] (26,800,000)                        
Fair Value [3],[20] $ (26,400,000)                        
Investment, Identifier [Axis]: Insight Global LLC, Senior Secured Loans—First Lien, Commercial & Professional Services, Maturing September 22, 2027 -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Base Rate Floor [33]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [16],[33]               $ 10,500,000          
Amortized Cost [33]               (10,500,000)          
Fair Value [4],[33]               $ (10,400,000)          
Investment, Identifier [Axis]: Insight Global LLC, Senior Secured Loans—First Lien, Commercial & Professional Services, Maturing September 22, 2027 -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Base Rate Floor [15]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [15],[16]               $ 10,500,000          
Amortized Cost [15]               (10,500,000)          
Fair Value [4],[15]               $ (10,400,000)          
Investment, Identifier [Axis]: Insight Global LLC, Senior Secured Loans—First Lien, Commercial & Professional Services, Maturing September 22, 2028                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[19],[33]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Base Rate Floor [19],[33]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [16],[19],[33]               $ 230,000,000.0          
Amortized Cost [19],[33]               (227,800,000)          
Fair Value [4],[19],[33]               $ (227,200,000)          
Investment, Identifier [Axis]: Insight Global LLC, Senior Secured Loans—First Lien, Commercial & Professional Services, Maturing November 15, 2028                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Base Rate Floor [15]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [15],[16]               $ 20,000,000.0          
Amortized Cost [15]               (20,000,000.0)          
Fair Value [4],[15]               $ (19,800,000)          
Investment, Identifier [Axis]: Integrity Marketing Group LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Base Rate Floor [15]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [15],[16]               $ 145,300,000          
Amortized Cost [15]               (145,300,000)          
Fair Value [4],[15]               $ (143,200,000)          
Investment, Identifier [Axis]: Integrity Marketing Group LLC, Senior Secured Loans - First Lien, Insurance                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[8] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[13] $ 124,700,000                        
Amortized Cost [8] (124,700,000)                        
Fair Value [3],[8] $ (122,400,000)                        
Investment, Identifier [Axis]: J S Held LLC, Senior Secured Loans - First Lien, Insurance 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[10],[21],[37],[42] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[8],[10],[21],[37],[42] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[10],[13],[21],[37],[42] $ 125,500,000                        
Amortized Cost [8],[10],[21],[37],[42] (123,300,000)                        
Fair Value [3],[8],[10],[21],[37],[42] $ (125,000,000.0)                        
Investment, Identifier [Axis]: J S Held LLC, Senior Secured Loans - First Lien, Insurance 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13] $ 1,700,000                        
Amortized Cost [8] (1,500,000)                        
Fair Value [3],[8] $ (1,700,000)                        
Investment, Identifier [Axis]: J S Held LLC, Senior Secured Loans - First Lien, Insurance 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[21] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[8],[21] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13],[21] $ 23,200,000                        
Amortized Cost [8],[21] (23,200,000)                        
Fair Value [3],[8],[21] $ (23,100,000)                        
Investment, Identifier [Axis]: J S Held LLC, Senior Secured Loans - First Lien, Insurance 4                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[20] $ 12,400,000                        
Amortized Cost [20] (12,400,000)                        
Fair Value [3],[20] $ (12,400,000)                        
Investment, Identifier [Axis]: J S Held LLC, Senior Secured Loans - First Lien, Insurance 5                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[20] $ 21,000,000.0                        
Amortized Cost [20] (21,000,000.0)                        
Fair Value [3],[20] $ (20,900,000)                        
Investment, Identifier [Axis]: J S Held LLC,, Senior Secured Loans—First Lien, Insurance -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[19],[33],[35],[41],[45]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Base Rate Floor [19],[33],[35],[41],[45]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[19],[33],[35],[41],[45]               $ 165,400,000          
Amortized Cost [19],[33],[35],[41],[45]               (159,800,000)          
Fair Value [4],[19],[33],[35],[41],[45]               $ (167,100,000)          
Investment, Identifier [Axis]: J S Held LLC,, Senior Secured Loans—First Lien, Insurance -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Base Rate Floor [33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33]               $ 2,800,000          
Amortized Cost [33]               (2,600,000)          
Fair Value [4],[33]               $ (2,800,000)          
Investment, Identifier [Axis]: J S Held LLC,, Senior Secured Loans—First Lien, Insurance -3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 16,700,000          
Amortized Cost [15]               (16,700,000)          
Fair Value [4],[15]               $ (16,900,000)          
Investment, Identifier [Axis]: J S Held LLC,, Senior Secured Loans—First Lien, Insurance -4                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 11,300,000          
Amortized Cost [15]               (11,300,000)          
Fair Value [4],[15]               (11,300,000)          
Investment, Identifier [Axis]: JW Aluminum Co                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Principal amount [16],[32],[33],[35],[38]               76,500,000          
Amortized Cost [32],[33],[35],[38]               (75,500,000)          
Fair Value [4],[32],[33],[35],[38]               $ (81,000,000.0)          
Investment, Identifier [Axis]: JW Aluminum Co, Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[32],[33],[54],[55]               2,105 2,105 2,105 2,105 2,105 2,105
Amortized Cost [26],[32],[33],[54],[55]               $ (0.0)          
Fair Value [4],[26],[32],[33],[54],[55]               $ 0          
Investment, Identifier [Axis]: JW Aluminum Co, Common Stock, Equity/Other, Materials                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [6],[7],[8],[31],[34] 2,105 2,105 2,105 2,105 2,105 2,105 2,105            
Amortized Cost [6],[7],[8],[31],[34] $ (0.0)                        
Fair Value [3],[6],[7],[8],[31],[34] $ (2,200,000)                        
Investment, Identifier [Axis]: JW Aluminum Co, Other Senior Debt, Materials                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[34],[37],[39] 10.30% 10.30% 10.30% 10.30% 10.30% 10.30% 10.30%            
Principal amount [8],[13],[34],[37],[39] $ 76,500,000                        
Amortized Cost [8],[34],[37],[39] (75,600,000)                        
Fair Value [3],[8],[34],[37],[39] $ (78,500,000)                        
Investment, Identifier [Axis]: JW Aluminum Co, Preferred Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[32],[33],[54],[55]               12.50% 12.50% 12.50% 12.50% 12.50% 12.50%
Number of Shares | shares [32],[33],[54],[55]               15,279 15,279 15,279 15,279 15,279 15,279
Amortized Cost [32],[33],[54],[55]               $ (177,900,000)          
Fair Value [4],[32],[33],[54],[55]               $ (122,600,000)          
Investment, Identifier [Axis]: JW Aluminum Co, Preferred Stock | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[32],[33],[54],[55]               12.50% 12.50% 12.50% 12.50% 12.50% 12.50%
Investment, Identifier [Axis]: JW Aluminum Co, Preferred Stock, Equity/Other, Materials                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[6],[7],[8],[34] 6.30% 6.30% 6.30% 6.30% 6.30% 6.30% 6.30%            
Number of Shares | shares [6],[7],[8],[34] 15,279 15,279 15,279 15,279 15,279 15,279 15,279            
Amortized Cost [6],[7],[8],[34] $ (195,600,000)                        
Fair Value [3],[6],[7],[8],[34] $ (105,400,000)                        
Investment, Identifier [Axis]: JW Aluminum Co, Preferred Stock, Equity/Other, Materials | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[6],[7],[8],[34] 12.50% 12.50% 12.50% 12.50% 12.50% 12.50% 12.50%            
Investment, Identifier [Axis]: Jarrow Formulas Inc                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[17],[18],[19],[33],[35],[40],[41],[45]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor [17],[18],[19],[33],[35],[40],[41],[45]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[17],[18],[19],[33],[35],[40],[41],[45]               $ 186,600,000          
Amortized Cost [17],[18],[19],[33],[35],[40],[41],[45]               (177,100,000)          
Fair Value [4],[17],[18],[19],[33],[35],[40],[41],[45]               $ (190,300,000)          
Investment, Identifier [Axis]: Jarrow Formulas Inc, Senior Secured Loans - First Lien, Household & Personal Products                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[10],[11],[12],[21],[22],[37],[42] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor [5],[8],[10],[11],[12],[21],[22],[37],[42] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[10],[11],[12],[13],[21],[22],[37],[42] $ 183,000,000.0                        
Amortized Cost [8],[10],[11],[12],[21],[22],[37],[42] (174,900,000)                        
Fair Value [3],[8],[10],[11],[12],[21],[22],[37],[42] $ (184,900,000)                        
Investment, Identifier [Axis]: Jet Edge International LLC, Preferred Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[43],[50]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Number of Shares | shares [43],[50]               20,878,236 20,878,236 20,878,236 20,878,236 20,878,236 20,878,236
Amortized Cost [43],[50]               $ (20,900,000)          
Fair Value [4],[43],[50]               $ (16,800,000)          
Investment, Identifier [Axis]: Jet Edge International LLC, Preferred Stock | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[43],[50]               8.00% 8.00% 8.00% 8.00% 8.00% 8.00%
Investment, Identifier [Axis]: Jet Edge International LLC, Term Loan, Asset Based Finance, Transportation -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[33],[43]               2.00% 2.00% 2.00% 2.00% 2.00% 2.00%
Principal amount [16],[33],[43]               $ 76,600,000          
Amortized Cost [33],[43]               (75,900,000)          
Fair Value [4],[33],[43]               $ (76,100,000)          
Investment, Identifier [Axis]: Jet Edge International LLC, Term Loan, Asset Based Finance, Transportation -1 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[33],[43]               2.00% 2.00% 2.00% 2.00% 2.00% 2.00%
Investment, Identifier [Axis]: Jet Edge International LLC, Term Loan, Asset Based Finance, Transportation -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[15],[43]               2.00% 2.00% 2.00% 2.00% 2.00% 2.00%
Principal amount [15],[16],[43]               $ 75,000,000.0          
Amortized Cost [15],[43]               (75,000,000.0)          
Fair Value [4],[15],[43]               $ (74,500,000)          
Investment, Identifier [Axis]: Jet Edge International LLC, Term Loan, Asset Based Finance, Transportation -2 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[15],[43]               2.00% 2.00% 2.00% 2.00% 2.00% 2.00%
Investment, Identifier [Axis]: Jet Edge International LLC, Term Loan, Asset Based Finance, Transportation 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8] 2.00% 2.00% 2.00% 2.00% 2.00% 2.00% 2.00%            
Principal amount [8],[13] $ 94,200,000                        
Amortized Cost [8] (94,200,000)                        
Fair Value [3],[8] $ (97,000,000.0)                        
Investment, Identifier [Axis]: Jet Edge International LLC, Term Loan, Asset Based Finance, Transportation 1 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8] 2.00% 2.00% 2.00% 2.00% 2.00% 2.00% 2.00%            
Investment, Identifier [Axis]: Jet Edge International LLC, Term Loan, Asset Based Finance, Transportation 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[20] 2.00% 2.00% 2.00% 2.00% 2.00% 2.00% 2.00%            
Principal amount [13],[20] $ 700,000                        
Amortized Cost [20] (700,000)                        
Fair Value [3],[20] $ (700,000)                        
Investment, Identifier [Axis]: Jet Edge International LLC, Term Loan, Asset Based Finance, Transportation 2 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[20] 2.00% 2.00% 2.00% 2.00% 2.00% 2.00% 2.00%            
Investment, Identifier [Axis]: Jet Edge International LLC, Warrant                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[43],[48]               3,963 3,963 3,963 3,963 3,963 3,963
Amortized Cost [26],[43],[48]               $ 0          
Fair Value [4],[26],[43],[48]               $ (4,500,000)          
Investment, Identifier [Axis]: Jones Apparel Holdings, Inc., Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33]               5,451 5,451 5,451 5,451 5,451 5,451
Amortized Cost [26],[33]               $ (900,000)          
Fair Value [4],[26],[33]               $ 0          
Investment, Identifier [Axis]: Jones Apparel Holdings, Inc., Common Stock, Equity/Other, Consumer Durables & Apparel                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[31] 5,451 5,451 5,451 5,451 5,451 5,451 5,451            
Amortized Cost [8],[31] $ (900,000)                        
Fair Value [3],[8],[31] $ 0                        
Investment, Identifier [Axis]: KBP Investments LLC | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               5.00% 5.00% 5.00% 5.00% 5.00% 5.00%
Base Rate Floor               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount               $ 23,700,000          
Amortized Cost               (23,600,000)          
Fair Value               $ (23,500,000)          
Investment, Identifier [Axis]: KBP Investments LLC 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount $ 23,600,000                        
Amortized Cost (23,500,000)                        
Fair Value $ (22,300,000)                        
Investment, Identifier [Axis]: KBP Investments LLC, Senior Secured Loans—First Lien, Food & Staples Retailing -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               5.00% 5.00% 5.00% 5.00% 5.00% 5.00%
Base Rate Floor [33]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [16],[33]               $ 23,600,000          
Amortized Cost [33]               (22,900,000)          
Fair Value [4],[33]               $ (23,300,000)          
Investment, Identifier [Axis]: KBP Investments LLC, Senior Secured Loans—First Lien, Food & Staples Retailing -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               5.00% 5.00% 5.00% 5.00% 5.00% 5.00%
Base Rate Floor [15]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [15],[16]               $ 3,900,000          
Amortized Cost [15]               (3,900,000)          
Fair Value [4],[15]               (3,800,000)          
Investment, Identifier [Axis]: KKR Central Park Leasing Aggregator L.P., Partnership Interest                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Principal amount [16],[23],[26],[27],[33]               39,100,000          
Amortized Cost [23],[26],[27],[33]               (39,100,000)          
Fair Value [4],[23],[26],[27],[33]               $ (25,800,000)          
Investment, Identifier [Axis]: KKR Central Park Leasing Aggregator L.P., Partnership Interest, Asset Based Finance, Capital Goods                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9],[28],[31] 14.30% 14.30% 14.30% 14.30% 14.30% 14.30% 14.30%            
Principal amount [8],[9],[13],[28],[31] $ 39,100,000                        
Amortized Cost [8],[9],[28],[31] (39,100,000)                        
Fair Value [3],[8],[9],[28],[31] $ (16,300,000)                        
Investment, Identifier [Axis]: KKR Chord IP Aggregator LP, Partnership Interest                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [27],[33]               114,193,861 114,193,861 114,193,861 114,193,861 114,193,861 114,193,861
Amortized Cost [27],[33]               $ (112,600,000)          
Fair Value [4],[27],[33]               (131,500,000)          
Investment, Identifier [Axis]: KKR Chord IP Aggregator LP, Partnership Interest Common Stock | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares 19,625,000 19,625,000 19,625,000 19,625,000 19,625,000 19,625,000 19,625,000            
Amortized Cost $ (22,900,000)                        
Fair Value $ (21,600,000)                        
Investment, Identifier [Axis]: KKR Chord IP Aggregator LP, Partnership Interest, Asset Based Finance, Insurance                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares 62,294,586 62,294,586 62,294,586 62,294,586 62,294,586 62,294,586 62,294,586            
Amortized Cost $ (62,300,000)                        
Fair Value $ (68,500,000)                        
Investment, Identifier [Axis]: KKR Chord IP Aggregator LP, Structured Mezzanine                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Principal amount [16],[27],[33]               167,300,000          
Amortized Cost [27],[33]               (164,900,000)          
Fair Value [4],[27],[33]               $ (167,300,000)          
Investment, Identifier [Axis]: KKR Rocket Loans Aggregator LLC, Partnership Interest                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [27],[32],[33]               1,387,913 1,387,913 1,387,913 1,387,913 1,387,913 1,387,913
Amortized Cost [27],[32],[33]               $ (1,400,000)          
Fair Value [4],[27],[32],[33]               $ (1,400,000)          
Investment, Identifier [Axis]: KKR Rocket Loans Aggregator LLC, Partnership Interest, Asset Based Finance, Diversified Financials                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[9],[34] 2,977,627 2,977,627 2,977,627 2,977,627 2,977,627 2,977,627 2,977,627            
Amortized Cost [8],[9],[34] $ (3,000,000.0)                        
Fair Value [3],[8],[9],[34] $ (3,000,000.0)                        
Investment, Identifier [Axis]: KKR Zeno Aggregator LP (K2 Aviation), Partnership Interest                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[27],[33]               23,664,954 23,664,954 23,664,954 23,664,954 23,664,954 23,664,954
Amortized Cost [26],[27],[33]               $ (23,000,000.0)          
Fair Value [4],[26],[27],[33]               $ (19,100,000)          
Investment, Identifier [Axis]: KKR Zeno Aggregator LP (K2 Aviation), Partnership Interest | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares 19,642,734,000,000 19,642,734,000,000 19,642,734,000,000 19,642,734,000,000 19,642,734,000,000 19,642,734,000,000 19,642,734,000,000            
Amortized Cost $ (24,400,000)                        
Fair Value $ (16,300,000)                        
Investment, Identifier [Axis]: KKR Zeno Aggregator LP (K2 Aviation), Partnership Interest 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares               19,642,734 19,642,734 19,642,734 19,642,734 19,642,734 19,642,734
Amortized Cost               $ (24,400,000)          
Fair Value               $ (15,900,000)          
Investment, Identifier [Axis]: KKR Zeno Aggregator LP (K2 Aviation), Partnership Interest, Asset Based Finance, Capital Goods                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[9],[31] 23,664,954 23,664,954 23,664,954 23,664,954 23,664,954 23,664,954 23,664,954            
Amortized Cost [8],[9],[31] $ (23,000,000.0)                        
Fair Value [3],[8],[9],[31] $ (19,600,000)                        
Investment, Identifier [Axis]: Kaman Space Inc, Senior Secured Loans - First Lien, Capital Goods 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[42] 7.00% 7.00% 7.00% 7.00% 7.00% 7.00% 7.00%            
Base Rate Floor [5],[8],[42] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13],[42] $ 52,500,000                        
Amortized Cost [8],[42] (50,100,000)                        
Fair Value [3],[8],[42] $ (52,700,000)                        
Investment, Identifier [Axis]: Kaman Space Inc, Senior Secured Loans - First Lien, Capital Goods 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 7.00% 7.00% 7.00% 7.00% 7.00% 7.00% 7.00%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13] $ 5,200,000                        
Amortized Cost [8] (5,000,000.0)                        
Fair Value [3],[8] $ (5,200,000)                        
Investment, Identifier [Axis]: Kaman Space Inc, Senior Secured Loans - First Lien, Capital Goods 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 7.00% 7.00% 7.00% 7.00% 7.00% 7.00% 7.00%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13] $ 38,100,000                        
Amortized Cost [8] (37,500,000)                        
Fair Value [3],[8] $ (38,200,000)                        
Investment, Identifier [Axis]: Kaman Space Inc, Senior Secured Loans - First Lien, Capital Goods 4                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 7.00% 7.00% 7.00% 7.00% 7.00% 7.00% 7.00%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[20] $ 300,000                        
Amortized Cost [20] (300,000)                        
Fair Value [3],[20] $ (300,000)                        
Investment, Identifier [Axis]: Karman Space Inc, Senior Secured Loans—First Lien, Capital Goods -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33],[41]               6.75% 6.75% 6.75% 6.75% 6.75% 6.75%
Base Rate Floor [33],[41]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33],[41]               $ 92,400,000          
Amortized Cost [33],[41]               (88,800,000)          
Fair Value [4],[33],[41]               $ (94,200,000)          
Investment, Identifier [Axis]: Karman Space Inc, Senior Secured Loans—First Lien, Capital Goods -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               6.75% 6.75% 6.75% 6.75% 6.75% 6.75%
Base Rate Floor [33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33]               $ 4,400,000          
Amortized Cost [33]               (4,200,000)          
Fair Value [4],[33]               $ (4,400,000)          
Investment, Identifier [Axis]: Karman Space Inc, Senior Secured Loans—First Lien, Capital Goods -3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               6.75% 6.75% 6.75% 6.75% 6.75% 6.75%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 1,100,000          
Amortized Cost [15]               (1,100,000)          
Fair Value [4],[15]               $ (1,100,000)          
Investment, Identifier [Axis]: Kellermeyer Bergensons Services LLC | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount               $ 29,500,000          
Amortized Cost               (28,100,000)          
Fair Value               $ (29,600,000)          
Investment, Identifier [Axis]: Kellermeyer Bergensons Services LLC 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount $ 29,200,000                        
Amortized Cost (28,100,000)                        
Fair Value $ (27,900,000)                        
Investment, Identifier [Axis]: Kellermeyer Bergensons Services LLC, Senior Secured Loans - First Lien, Commercial & Professional Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[10],[11],[12],[21],[22],[37],[42] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Base Rate Floor [5],[8],[10],[11],[12],[21],[22],[37],[42] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[10],[11],[12],[13],[21],[22],[37],[42] $ 369,900,000                        
Amortized Cost [8],[10],[11],[12],[21],[22],[37],[42] (359,300,000)                        
Fair Value [3],[8],[10],[11],[12],[21],[22],[37],[42] $ (353,200,000)                        
Investment, Identifier [Axis]: Kellermeyer Bergensons Services LLC, Senior Secured Loans—First Lien, Commercial & Professional Services -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[17],[18],[19],[33],[35],[40],[41],[45]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor [17],[18],[19],[33],[35],[40],[41],[45]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[17],[18],[19],[33],[35],[40],[41],[45]               $ 341,700,000          
Amortized Cost [17],[18],[19],[33],[35],[40],[41],[45]               (329,600,000)          
Fair Value [4],[17],[18],[19],[33],[35],[40],[41],[45]               $ (342,800,000)          
Investment, Identifier [Axis]: Kellermeyer Bergensons Services LLC, Senior Secured Loans—First Lien, Commercial & Professional Services -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 31,000,000.0          
Amortized Cost [15]               (31,000,000.0)          
Fair Value [4],[15]               $ (31,100,000)          
Investment, Identifier [Axis]: Kettle Cuisine LLC | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 3.75% 3.75% 3.75% 3.75% 3.75% 3.75% 3.75% 3.75% 3.75% 3.75% 3.75% 3.75% 3.75%
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount $ 16,300,000             $ 16,400,000          
Amortized Cost (16,300,000)             (16,400,000)          
Fair Value $ (15,200,000)             $ (15,600,000)          
Investment, Identifier [Axis]: Kilter Finance, Preferred Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[27],[32],[33]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Number of Shares | shares [27],[32],[33]               36,108,611 36,108,611 36,108,611 36,108,611 36,108,611 36,108,611
Amortized Cost [27],[32],[33]               $ (34,600,000)          
Fair Value [4],[27],[32],[33]               $ (36,100,000)          
Investment, Identifier [Axis]: Kilter Finance, Preferred Stock, Asset Based Finance, Insurance                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[9],[34] 12.00% 12.00% 12.00% 12.00% 12.00% 12.00% 12.00%            
Principal amount [8],[9],[13],[34] $ 75,900,000                        
Amortized Cost [8],[9],[34] (74,400,000)                        
Fair Value [3],[8],[9],[34] $ (75,900,000)                        
Investment, Identifier [Axis]: Kilter Finance, Private Equity                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[27],[32],[33]               536,709 536,709 536,709 536,709 536,709 536,709
Amortized Cost [26],[27],[32],[33]               $ (500,000)          
Fair Value [4],[26],[27],[32],[33]               $ (500,000)          
Investment, Identifier [Axis]: Kilter Finance, Private Equity, Asset Based Finance, Insurance                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[9],[31],[34] 536,709 536,709 536,709 536,709 536,709 536,709 536,709            
Amortized Cost [8],[9],[31],[34] $ (500,000)                        
Fair Value [3],[8],[9],[31],[34] $ (500,000)                        
Investment, Identifier [Axis]: Lakefield Veterinary Group | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount $ 27,100,000                        
Amortized Cost (26,800,000)                        
Fair Value $ (26,400,000)                        
Investment, Identifier [Axis]: Lakefield Veterinary Group, Senior Secured Loans - First Lien, Commercial & Professional Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[10],[21] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[8],[10],[21] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[10],[13],[21] $ 103,800,000                        
Amortized Cost [8],[10],[21] (103,000,000.0)                        
Fair Value [3],[8],[10],[21] $ (100,800,000)                        
Investment, Identifier [Axis]: Lakefield Veterinary Group, Senior Secured Loans - First Lien, Commercial & Professional Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [13],[20] $ 40,000,000.0                        
Amortized Cost [20] (40,000,000.0)                        
Fair Value [3],[20] $ (38,900,000)                        
Investment, Identifier [Axis]: Lakefield Veterinary Group, Senior Secured Loans—First Lien, Consumer Services -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[19],[33],[45]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Base Rate Floor [19],[33],[45]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [16],[19],[33],[45]               $ 115,600,000          
Amortized Cost [19],[33],[45]               (114,500,000)          
Fair Value [4],[19],[33],[45]               $ (114,600,000)          
Investment, Identifier [Axis]: Lakefield Veterinary Group, Senior Secured Loans—First Lien, Consumer Services -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Base Rate Floor [15]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [15],[16]               $ 56,300,000          
Amortized Cost [15]               (56,300,000)          
Fair Value [4],[15]               $ (55,700,000)          
Investment, Identifier [Axis]: Lakeview Farms Inc | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount $ 15,600,000             $ 15,700,000          
Amortized Cost (15,500,000)             (15,600,000)          
Fair Value $ (14,900,000)             $ (15,600,000)          
Investment, Identifier [Axis]: Lakeview Farms Inc, Senior Secured Loans - First Lien, Food, Beverage & Tobacco 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[12],[42] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor [5],[8],[12],[42] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[12],[13],[42] $ 76,400,000                        
Amortized Cost [8],[12],[42] (74,700,000)                        
Fair Value [3],[8],[12],[42] $ (73,200,000)                        
Investment, Identifier [Axis]: Lakeview Farms Inc, Senior Secured Loans - First Lien, Food, Beverage & Tobacco 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13] $ 5,000,000.0                        
Amortized Cost [8] (5,000,000.0)                        
Fair Value [3],[8] $ (4,800,000)                        
Investment, Identifier [Axis]: Lakeview Farms Inc, Senior Secured Loans - First Lien, Food, Beverage & Tobacco 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[20] $ 10,800,000                        
Amortized Cost [20] (10,800,000)                        
Fair Value [3],[20] $ (10,400,000)                        
Investment, Identifier [Axis]: Lakeview Farms Inc, Senior Secured Loans - First Lien, Food, Beverage & Tobacco 4                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[20] $ 1,800,000                        
Amortized Cost [20] (1,800,000)                        
Fair Value [3],[20] $ (1,700,000)                        
Investment, Identifier [Axis]: Lakeview Farms Inc, Senior Secured Loans—First Lien, Food, Beverage & Tobacco -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[18],[33],[41]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor [18],[33],[41]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[18],[33],[41]               $ 77,000,000.0          
Amortized Cost [18],[33],[41]               (75,100,000)          
Fair Value [4],[18],[33],[41]               $ (76,500,000)          
Investment, Identifier [Axis]: Lakeview Farms Inc, Senior Secured Loans—First Lien, Food, Beverage & Tobacco -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor [33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33]               $ 3,400,000          
Amortized Cost [33]               (3,400,000)          
Fair Value [4],[33]               $ (3,400,000)          
Investment, Identifier [Axis]: Lakeview Farms Inc, Senior Secured Loans—First Lien, Food, Beverage & Tobacco -3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 10,800,000          
Amortized Cost [15]               (10,800,000)          
Fair Value [4],[15]               $ (10,800,000)          
Investment, Identifier [Axis]: Lakeview Farms Inc, Senior Secured Loans—First Lien, Food, Beverage & Tobacco -4                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 3,400,000          
Amortized Cost [15]               (3,400,000)          
Fair Value [4],[15]               $ (3,400,000)          
Investment, Identifier [Axis]: Lenovo Group Ltd, Structured Mezzanine 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 10.75% 10.75% 10.75% 10.75% 10.75% 10.75% 10.75% 780.00% 780.00% 780.00% 780.00% 780.00% 780.00%
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount $ 4,700,000                   € 6.9    
Amortized Cost (4,700,000)             $ (8,100,000)          
Fair Value $ (4,700,000)             $ (7,900,000)          
Investment, Identifier [Axis]: Lenovo Group Ltd, Structured Mezzanine 2 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 10.75% 10.75% 10.75% 10.75% 10.75% 10.75% 10.75% 780.00% 780.00% 780.00% 780.00% 780.00% 780.00%
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount       € 3.6       $ 10,700,000          
Amortized Cost $ (3,600,000)             (10,700,000)          
Fair Value $ (3,500,000)             $ (10,700,000)          
Investment, Identifier [Axis]: Lenovo Group Ltd, Structured Mezzanine 3 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.75% 6.75% 6.75% 6.75% 6.75% 6.75% 6.75% 1180.00% 1180.00% 1180.00% 1180.00% 1180.00% 1180.00%
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount | €       € 5.0             € 4.8    
Amortized Cost $ (5,000,000.0)             $ (5,600,000)          
Fair Value $ (4,900,000)             $ (5,400,000)          
Investment, Identifier [Axis]: Lenovo Group Ltd, Structured Mezzanine 4 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.75% 6.75% 6.75% 6.75% 6.75% 6.75% 6.75% 1180.00% 1180.00% 1180.00% 1180.00% 1180.00% 1180.00%
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount | £         £ 1.1             £ 1.3  
Amortized Cost $ (1,300,000)                     (1.8)  
Fair Value $ (1,300,000)                     £ (1.7)  
Investment, Identifier [Axis]: Lenovo Group Ltd, Structured Mezzanine 5 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.75% 6.75% 6.75% 6.75% 6.75% 6.75% 6.75% 780.00% 780.00% 780.00% 780.00% 780.00% 780.00%
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount $ 6,500,000                     £ 1.9  
Amortized Cost (6,500,000)                     (2.6)  
Fair Value $ (6,500,000)                     £ (2.5)  
Investment, Identifier [Axis]: Lenovo Group Ltd, Structured Mezzanine 6 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 10.75% 10.75% 10.75% 10.75% 10.75% 10.75% 10.75% 1180.00% 1180.00% 1180.00% 1180.00% 1180.00% 1180.00%
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount         £ 0.8     $ 7,400,000          
Amortized Cost $ (900,000)             (7,400,000)          
Fair Value $ (900,000)             (7,400,000)          
Investment, Identifier [Axis]: Lenovo Group Ltd, Structured Mezzanine, Asset Based Finance, Technology Hardware & Equipment -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Principal amount | € [16],[27],[33]                     € 7.8    
Amortized Cost [27],[33]               (9,200,000)          
Fair Value [4],[27],[33]               (8,900,000)          
Investment, Identifier [Axis]: Lenovo Group Ltd, Structured Mezzanine, Asset Based Finance, Technology Hardware & Equipment -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Principal amount [16],[27],[33]               12,100,000          
Amortized Cost [27],[33]               (12,100,000)          
Fair Value [4],[27],[33]               (12,100,000)          
Investment, Identifier [Axis]: Lenovo Group Ltd, Structured Mezzanine, Asset Based Finance, Technology Hardware & Equipment -3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Principal amount | € [16],[27],[33]                     € 5.9    
Amortized Cost [27],[33]               (6,900,000)          
Fair Value [4],[27],[33]               (6,700,000)          
Investment, Identifier [Axis]: Lenovo Group Ltd, Structured Mezzanine, Asset Based Finance, Technology Hardware & Equipment -4                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Principal amount | £ [16],[27],[33]                       £ 1.6  
Amortized Cost [27],[33]               (2,200,000)          
Fair Value [4],[27],[33]               (2,100,000)          
Investment, Identifier [Axis]: Lenovo Group Ltd, Structured Mezzanine, Asset Based Finance, Technology Hardware & Equipment -5                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Principal amount | £ [16],[27],[33]                       £ 2.1  
Amortized Cost [27],[33]               (2,900,000)          
Fair Value [4],[27],[33]               (2,900,000)          
Investment, Identifier [Axis]: Lenovo Group Ltd, Structured Mezzanine, Asset Based Finance, Technology Hardware & Equipment -6                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Principal amount [16],[27],[33]               9,100,000          
Amortized Cost [27],[33]               (9,100,000)          
Fair Value [4],[27],[33]               $ (9,100,000)          
Investment, Identifier [Axis]: Lexitas Inc | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount $ 18,500,000                        
Amortized Cost (18,500,000)                        
Fair Value $ (18,200,000)                        
Investment, Identifier [Axis]: Lexitas Inc 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Base Rate Floor               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount               $ 8,000,000.0          
Amortized Cost               (7,900,000)          
Fair Value               $ (8,100,000)          
Investment, Identifier [Axis]: Lexitas Inc 2 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Base Rate Floor               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount               $ 10,700,000          
Amortized Cost               (10,700,000)          
Fair Value               $ (10,800,000)          
Investment, Identifier [Axis]: Lexitas Inc, Senior Secured Loans - First Lien, Commercial & Professional Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13] $ 6,400,000                        
Amortized Cost [8] (6,400,000)                        
Fair Value [3],[8] $ (6,300,000)                        
Investment, Identifier [Axis]: Lexitas Inc, Senior Secured Loans - First Lien, Commercial & Professional Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[10],[11],[12],[42] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor [5],[8],[10],[11],[12],[42] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[10],[11],[12],[13],[42] $ 121,200,000                        
Amortized Cost [8],[10],[11],[12],[42] (118,200,000)                        
Fair Value [3],[8],[10],[11],[12],[42] $ (119,400,000)                        
Investment, Identifier [Axis]: Lexitas Inc, Senior Secured Loans - First Lien, Commercial & Professional Services 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount | £ [13],[20]         £ 8.4                
Amortized Cost [20] $ (8,400,000)                        
Fair Value [3],[20] $ (8,300,000)                        
Investment, Identifier [Axis]: Lexitas Inc, Senior Secured Loans - First Lien, Commercial & Professional Services 4                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount | £ [13],[20]         £ 5.9                
Amortized Cost [20] $ (5,900,000)                        
Fair Value [3],[20] $ (5,800,000)                        
Investment, Identifier [Axis]: Lexitas Inc, Senior Secured Loans—First Lien, Commercial & Professional Services -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[17],[18],[19],[33],[41]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Base Rate Floor [17],[18],[19],[33],[41]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[17],[18],[19],[33],[41]               $ 106,800,000          
Amortized Cost [17],[18],[19],[33],[41]               (103,300,000)          
Fair Value [4],[17],[18],[19],[33],[41]               $ (107,800,000)          
Investment, Identifier [Axis]: Lexitas Inc, Senior Secured Loans—First Lien, Commercial & Professional Services -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 10,300,000          
Amortized Cost [15]               (10,300,000)          
Fair Value [4],[15]               $ (10,400,000)          
Investment, Identifier [Axis]: Lexitas Inc, Senior Secured Loans—First Lien, Commercial & Professional Services -3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 5,400,000          
Amortized Cost [15]               (5,400,000)          
Fair Value [4],[15]               $ (5,400,000)          
Investment, Identifier [Axis]: Lionbridge Technologies Inc                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[17],[35],[40],[45]               7.00% 7.00% 7.00% 7.00% 7.00% 7.00%
Base Rate Floor [17],[35],[40],[45]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[17],[35],[40],[45]               $ 68,900,000          
Amortized Cost [17],[35],[40],[45]               (64,000,000.0)          
Fair Value [4],[17],[35],[40],[45]               $ (70,300,000)          
Investment, Identifier [Axis]: Lionbridge Technologies Inc | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 7.00% 7.00% 7.00% 7.00% 7.00% 7.00% 7.00%            
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount $ 27,200,000                        
Amortized Cost (26,700,000)                        
Fair Value $ (27,400,000)                        
Investment, Identifier [Axis]: Lionbridge Technologies Inc | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               7.00% 7.00% 7.00% 7.00% 7.00% 7.00%
Base Rate Floor               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount               $ 28,300,000          
Amortized Cost               (27,700,000)          
Fair Value               $ (28,900,000)          
Investment, Identifier [Axis]: Lionbridge Technologies Inc, Senior Secured Loans - First Lien, Media & Entertainment                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[11],[21],[22],[37],[42] 7.00% 7.00% 7.00% 7.00% 7.00% 7.00% 7.00%            
Base Rate Floor [5],[8],[11],[21],[22],[37],[42] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[11],[13],[21],[22],[37],[42] $ 124,400,000                        
Amortized Cost [8],[11],[21],[22],[37],[42] (120,400,000)                        
Fair Value [3],[8],[11],[21],[22],[37],[42] $ (125,600,000)                        
Investment, Identifier [Axis]: Lipari Foods LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33],[35],[41],[45]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor [33],[35],[41],[45]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33],[35],[41],[45]               $ 272,000,000.0          
Amortized Cost [33],[35],[41],[45]               (261,200,000)          
Fair Value [4],[33],[35],[41],[45]               $ (272,000,000.0)          
Investment, Identifier [Axis]: Lipari Foods LLC 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount $ 42,800,000             $ 65,300,000          
Amortized Cost (42,800,000)             (65,200,000)          
Fair Value $ (42,800,000)             $ (65,400,000)          
Investment, Identifier [Axis]: Lipari Foods LLC 2 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount $ 21,700,000                        
Amortized Cost (21,700,000)                        
Fair Value $ (21,700,000)                        
Investment, Identifier [Axis]: Lipari Foods LLC, Senior Secured Loans - First Lien, Food & Staples Retailing 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[21],[37],[42] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[8],[21],[37],[42] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13],[21],[37],[42] $ 228,500,000                        
Amortized Cost [8],[21],[37],[42] (221,100,000)                        
Fair Value [3],[8],[21],[37],[42] $ (228,500,000)                        
Investment, Identifier [Axis]: Lipari Foods LLC, Senior Secured Loans - First Lien, Food & Staples Retailing 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[21],[37] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[8],[21],[37] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13],[21],[37] $ 40,000,000.0                        
Amortized Cost [8],[21],[37] (38,900,000)                        
Fair Value [3],[8],[21],[37] $ (40,000,000.0)                        
Investment, Identifier [Axis]: Lloyd's Register Quality Assurance Ltd                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15],[27]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Interest rate, paid in kind [14],[15],[27]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Base Rate Floor [15],[27]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount | £ [15],[16],[27]                       £ 15.0  
Amortized Cost [15],[27]               $ (20,000,000.0)          
Fair Value [4],[15],[27]               $ (19,700,000)          
Investment, Identifier [Axis]: Lloyd's Register Quality Assurance Ltd | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[15],[27]               6.30% 6.30% 6.30% 6.30% 6.30% 6.30%
Investment, Identifier [Axis]: Lloyd's Register Quality Assurance Ltd 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Interest rate, paid in kind               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Base Rate Floor               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount | €                     € 44.3    
Amortized Cost               $ (48,600,000)          
Fair Value               $ (48,900,000)          
Investment, Identifier [Axis]: Lloyd's Register Quality Assurance Ltd 1 | Maximum | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind               630.00% 630.00% 630.00% 630.00% 630.00% 630.00%
Investment, Identifier [Axis]: Lrqa Ltd | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Interest rate, paid in kind 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Base Rate Floor 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount | €       € 44.3                  
Amortized Cost $ (48,700,000)                        
Fair Value $ (42,400,000)                        
Investment, Identifier [Axis]: Lrqa Ltd | Maximum | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind 6.30% 6.30% 6.30% 6.30% 6.30% 6.30% 6.30%            
Investment, Identifier [Axis]: Lrqa Ltd, Senior Secured Loans - First Lien, Consumer Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Interest rate, paid in kind [5],[8],[9] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Base Rate Floor [5],[8],[9] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount [8],[9],[13] $ 5,700,000                        
Amortized Cost [8],[9] (7,400,000)                        
Fair Value [3],[8],[9] $ (6,200,000)                        
Investment, Identifier [Axis]: Lrqa Ltd, Senior Secured Loans - First Lien, Consumer Services 1 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[9] 6.30% 6.30% 6.30% 6.30% 6.30% 6.30% 6.30%            
Investment, Identifier [Axis]: Lrqa Ltd, Senior Secured Loans - First Lien, Consumer Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[9],[20] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Interest rate, paid in kind [5],[9],[20] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Base Rate Floor [5],[9],[20] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount [9],[13],[20] $ 9,300,000                        
Amortized Cost [9],[20] (12,600,000)                        
Fair Value [3],[9],[20] $ (12,400,000)                        
Investment, Identifier [Axis]: Lrqa Ltd, Senior Secured Loans - First Lien, Consumer Services 2 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[9],[20] 6.30% 6.30% 6.30% 6.30% 6.30% 6.30% 6.30%            
Investment, Identifier [Axis]: Luxembourg Life Fund - Absolute Return Fund I, 1L Term Loan | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               7.50% 7.50% 7.50% 7.50% 7.50% 7.50%
Base Rate Floor               1.50% 1.50% 1.50% 1.50% 1.50% 1.50%
Principal amount               $ 26,800,000          
Amortized Cost               (26,900,000)          
Fair Value               $ (27,100,000)          
Investment, Identifier [Axis]: Luxembourg Life Fund - Absolute Return Fund I, 1L Term Loan | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 7.50% 7.50% 7.50% 7.50% 7.50% 7.50% 7.50%            
Base Rate Floor 1.50% 1.50% 1.50% 1.50% 1.50% 1.50% 1.50%            
Principal amount $ 21,400,000                        
Amortized Cost (21,400,000)                        
Fair Value $ (21,300,000)                        
Investment, Identifier [Axis]: Luxembourg Life Fund - Absolute Return Fund II, Structured Mezzanine, Asset Based Finance, Insurance                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9] 7.50% 7.50% 7.50% 7.50% 7.50% 7.50% 7.50%            
Base Rate Floor [5],[8],[9] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%            
Principal amount [8],[9],[13] $ 26,200,000                        
Amortized Cost [8],[9] (26,200,000)                        
Fair Value [3],[8],[9] $ (26,000,000.0)                        
Investment, Identifier [Axis]: Luxembourg Life Fund - Absolute Return Fund III, Term Loan | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 9.25% 9.25% 9.25% 9.25% 9.25% 9.25% 9.25% 9.25% 9.25% 9.25% 9.25% 9.25% 9.25%
Base Rate Floor 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount $ 56,600,000             $ 57,500,000          
Amortized Cost (56,200,000)             (57,000,000.0)          
Fair Value $ (57,600,000)             $ (57,000,000.0)          
Investment, Identifier [Axis]: Luxembourg Life Fund - Long Term Growth Fund, Term Loan | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 9.25% 9.25% 9.25% 9.25% 9.25% 9.25% 9.25%            
Base Rate Floor 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount $ 90,100,000             $ 94,600,000          
Amortized Cost (89,900,000)             (94,100,000)          
Fair Value $ (91,000,000.0)             $ (94,500,000)          
Investment, Identifier [Axis]: MB Precision Holdings LLC, Class A - 2 Units                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[52],[56]               8,081,288 8,081,288 8,081,288 8,081,288 8,081,288 8,081,288
Amortized Cost [26],[52],[56]               $ (500,000)          
Fair Value [4],[26],[52],[56]               $ 0          
Investment, Identifier [Axis]: MB Precision Holdings LLC, Class A - 2 Units, Equity/Other, Capital Goods                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [31],[53],[57] 8,081,288 8,081,288 8,081,288 8,081,288 8,081,288 8,081,288 8,081,288            
Amortized Cost [31],[53],[57] $ (500,000)                        
Fair Value [3],[31],[53],[57] $ 0                        
Investment, Identifier [Axis]: MB2 Dental Solutions LLC | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount $ 12,000,000.0                        
Amortized Cost (11,800,000)                        
Fair Value $ (11,800,000)                        
Investment, Identifier [Axis]: MB2 Dental Solutions LLC, Senior Secured Loans - First Lien, Health Care Equipment & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[11],[12],[22],[42] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Base Rate Floor [5],[8],[11],[12],[22],[42] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[11],[12],[13],[22],[42] $ 273,700,000                        
Amortized Cost [8],[11],[12],[22],[42] (264,400,000)                        
Fair Value [3],[8],[11],[12],[22],[42] $ (270,200,000)                        
Investment, Identifier [Axis]: MB2 Dental Solutions LLC, Senior Secured Loans—First Lien, Health Care Equipment & Services -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[17],[18],[33],[40],[41]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Base Rate Floor [17],[18],[33],[40],[41]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[17],[18],[33],[40],[41]               $ 231,000,000.0          
Amortized Cost [17],[18],[33],[40],[41]               (220,300,000)          
Fair Value [4],[17],[18],[33],[40],[41]               $ (231,700,000)          
Investment, Identifier [Axis]: MB2 Dental Solutions LLC, Senior Secured Loans—First Lien, Health Care Equipment & Services -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 56,700,000          
Amortized Cost [15]               (56,700,000)          
Fair Value [4],[15]               $ (56,900,000)          
Investment, Identifier [Axis]: Matchesfashion Ltd                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[27],[33]               4.63% 4.63% 4.63% 4.63% 4.63% 4.63%
Interest rate, paid in kind [14],[27],[33]               3.00% 3.00% 3.00% 3.00% 3.00% 3.00%
Base Rate Floor [27],[33]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount [16],[27],[33]               $ 12,900,000          
Amortized Cost [27],[33]               (12,400,000)          
Fair Value [4],[27],[33]               $ (8,200,000)          
Investment, Identifier [Axis]: Matchesfashion Ltd | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[27],[33]               3.00% 3.00% 3.00% 3.00% 3.00% 3.00%
Investment, Identifier [Axis]: Matchesfashion Ltd, Senior Secured Loans - First Lien, Consumer Durables & Apparel                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9],[28],[31] 4.63% 4.63% 4.63% 4.63% 4.63% 4.63% 4.63%            
Interest rate, paid in kind [5],[8],[9],[28],[31] 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00%            
Base Rate Floor [5],[8],[9],[28],[31] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount [8],[9],[13],[28],[31] $ 13,100,000                        
Amortized Cost [8],[9],[28],[31] (12,700,000)                        
Fair Value [3],[8],[9],[28],[31] $ (6,200,000)                        
Investment, Identifier [Axis]: Matchesfashion Ltd, Senior Secured Loans - First Lien, Consumer Durables & Apparel | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[9],[28],[31] 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00%            
Investment, Identifier [Axis]: Maverick Natural Resources LLC, Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[52],[56]               259,211 259,211 259,211 259,211 259,211 259,211
Amortized Cost [26],[52],[56]               $ (84,500,000)          
Fair Value [4],[26],[52],[56]               $ (143,600,000)          
Investment, Identifier [Axis]: Maverick Natural Resources LLC, Common Stock, Equity/Other, Energy                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [31],[53],[57] 259,211 259,211 259,211 259,211 259,211 259,211 259,211            
Amortized Cost [31],[53],[57] $ (84,500,000)                        
Fair Value [3],[31],[53],[57] $ (192,600,000)                        
Investment, Identifier [Axis]: Med-Metrix | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount $ 11,900,000                        
Amortized Cost (11,900,000)                        
Fair Value $ (11,900,000)                        
Investment, Identifier [Axis]: Med-Metrix, Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[48]               29,403 29,403 29,403 29,403 29,403 29,403
Amortized Cost [26],[48]               $ (1,500,000)          
Fair Value [4],[26],[48]               $ (1,600,000)          
Investment, Identifier [Axis]: Med-Metrix, Common Stock, Equity/Other, Software & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [31],[49] 29,403 29,403 29,403 29,403 29,403 29,403 29,403            
Amortized Cost [31],[49] $ (1,500,000)                        
Fair Value [3],[31],[49] $ (2,500,000)                        
Investment, Identifier [Axis]: Med-Metrix, Preferred Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[48]               8.00% 8.00% 8.00% 8.00% 8.00% 8.00%
Number of Shares | shares [48]               29,403 29,403 29,403 29,403 29,403 29,403
Amortized Cost [48]               $ (1,500,000)          
Fair Value [4],[48]               $ (1,500,000)          
Investment, Identifier [Axis]: Med-Metrix, Preferred Stock | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[48]               8.00% 8.00% 8.00% 8.00% 8.00% 8.00%
Investment, Identifier [Axis]: Med-Metrix, Preferred Stock, Equity/Other, Software & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[49] 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%            
Number of Shares | shares [49] 29,403 29,403 29,403 29,403 29,403 29,403 29,403            
Amortized Cost [49] $ (1,500,000)                        
Fair Value [3],[49] $ (1,500,000)                        
Investment, Identifier [Axis]: Med-Metrix, Preferred Stock, Equity/Other, Software & Services | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[49] 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%            
Investment, Identifier [Axis]: Med-Metrix, Senior Secured Loans - First Lien, Software & Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13] $ 56,300,000                        
Amortized Cost [8] (55,800,000)                        
Fair Value [3],[8] $ (56,400,000)                        
Investment, Identifier [Axis]: Med-Metrix, Senior Secured Loans - First Lien, Software & Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[20] $ 25,000,000.0                        
Amortized Cost [20] (25,000,000.0)                        
Fair Value [3],[20] $ (25,100,000)                        
Investment, Identifier [Axis]: Med-Metrix, Senior Secured Loans - First Lien, Software & Services 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[20] $ 7,800,000                        
Amortized Cost [20] (7,800,000)                        
Fair Value [3],[20] $ (7,800,000)                        
Investment, Identifier [Axis]: Med-Metrix, Senior Secured Loans—First Lien, Software & Services -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Base Rate Floor [33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33]               $ 62,400,000          
Amortized Cost [33]               (61,800,000)          
Fair Value [4],[33]               $ (61,900,000)          
Investment, Identifier [Axis]: Med-Metrix, Senior Secured Loans—First Lien, Software & Services -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 31,300,000          
Amortized Cost [15]               (31,300,000)          
Fair Value [4],[15]               $ (31,000,000.0)          
Investment, Identifier [Axis]: Med-Metrix, Senior Secured Loans—First Lien, Software & Services -3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 7,800,000          
Amortized Cost [15]               (7,800,000)          
Fair Value [4],[15]               $ (7,800,000)          
Investment, Identifier [Axis]: Medallia Inc                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[33]               6.75% 6.75% 6.75% 6.75% 6.75% 6.75%
Base Rate Floor [33]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [16],[33]               $ 147,900,000          
Amortized Cost [33]               (146,500,000)          
Fair Value [4],[33]               $ (146,500,000)          
Investment, Identifier [Axis]: Medallia Inc | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[33]               6.75% 6.75% 6.75% 6.75% 6.75% 6.75%
Investment, Identifier [Axis]: Medallia Inc, Senior Secured Loans - First Lien, Software & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 6.75% 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%            
Base Rate Floor [5],[8] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[13] $ 205,100,000                        
Amortized Cost [8] (203,100,000)                        
Fair Value [3],[8] $ (203,100,000)                        
Investment, Identifier [Axis]: Medallia Inc, Senior Secured Loans - First Lien, Software & Services | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 6.75% 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%            
Investment, Identifier [Axis]: Miami Beach Medical Group LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[17],[18],[33],[40],[41]               6.50% 6.50% 6.50% 6.50% 6.50% 6.50%
Base Rate Floor [17],[18],[33],[40],[41]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[17],[18],[33],[40],[41]               $ 180,600,000          
Amortized Cost [17],[18],[33],[40],[41]               (171,400,000)          
Fair Value [4],[17],[18],[33],[40],[41]               $ (178,600,000)          
Investment, Identifier [Axis]: Miami Beach Medical Group LLC, Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33]               5,000,000 5,000,000 5,000,000 5,000,000 5,000,000 5,000,000
Amortized Cost [26],[33]               $ (4,800,000)          
Fair Value [4],[26],[33]               $ (3,900,000)          
Investment, Identifier [Axis]: Miami Beach Medical Group LLC, Common Stock, Equity/Other, Health Care Equipment & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[31] 5,000,000 5,000,000 5,000,000 5,000,000 5,000,000 5,000,000 5,000,000            
Amortized Cost [8],[31] $ (4,800,000)                        
Fair Value [3],[8],[31] $ (1,600,000)                        
Investment, Identifier [Axis]: Miami Beach Medical Group LLC, Senior Secured Loans - First Lien, Health Care Equipment & Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[11],[12],[22],[42] 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%            
Interest rate, paid in kind [5],[8],[11],[12],[22],[42] 1.50% 1.50% 1.50% 1.50% 1.50% 1.50% 1.50%            
Base Rate Floor [5],[8],[11],[12],[22],[42] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[11],[12],[13],[22],[42] $ 140,500,000                        
Amortized Cost [8],[11],[12],[22],[42] (134,100,000)                        
Fair Value [3],[8],[11],[12],[22],[42] $ (130,800,000)                        
Investment, Identifier [Axis]: Miami Beach Medical Group LLC, Senior Secured Loans - First Lien, Health Care Equipment & Services 1 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[11],[12],[22],[42] 1.50% 1.50% 1.50% 1.50% 1.50% 1.50% 1.50%            
Investment, Identifier [Axis]: Miami Beach Medical Group LLC, Senior Secured Loans - First Lien, Health Care Equipment & Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%            
Interest rate, paid in kind [5],[8] 1.50% 1.50% 1.50% 1.50% 1.50% 1.50% 1.50%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13] $ 23,300,000                        
Amortized Cost [8] (22,100,000)                        
Fair Value [3],[8] $ (21,700,000)                        
Investment, Identifier [Axis]: Miami Beach Medical Group LLC, Senior Secured Loans - First Lien, Health Care Equipment & Services 2 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8] 1.50% 1.50% 1.50% 1.50% 1.50% 1.50% 1.50%            
Investment, Identifier [Axis]: Micronics Filtration Holdings Inc                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[33],[43]               7.50% 7.50% 7.50% 7.50% 7.50% 7.50%
Principal amount [16],[33],[43]               $ 51,400,000          
Amortized Cost [33],[43]               (46,000,000.0)          
Fair Value [4],[33],[43]               $ (51,000,000.0)          
Investment, Identifier [Axis]: Micronics Filtration Holdings Inc | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[33],[43]               7.50% 7.50% 7.50% 7.50% 7.50% 7.50%
Investment, Identifier [Axis]: Micronics Filtration Holdings Inc, Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33],[43]               53,073 53,073 53,073 53,073 53,073 53,073
Amortized Cost [26],[33],[43]               $ (600,000)          
Fair Value [4],[26],[33],[43]               $ 0          
Investment, Identifier [Axis]: Micronics Filtration Holdings Inc, Preferred Stock, Series A                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33],[43]               55 55 55 55 55 55
Amortized Cost [26],[33],[43]               $ (600,000)          
Fair Value [4],[26],[33],[43]               $ (100,000)          
Investment, Identifier [Axis]: Micronics Filtration Holdings Inc, Preferred Stock, Series B                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33],[43]               23 23 23 23 23 23
Amortized Cost [26],[33],[43]               $ (200,000)          
Fair Value [4],[26],[33],[43]               $ (400,000)          
Investment, Identifier [Axis]: Micronics Filtration Holdings Inc, Preferred Stock, Series B PIK                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33],[43]               112,780 112,780 112,780 112,780 112,780 112,780
Amortized Cost [26],[33],[43]               $ 0          
Fair Value [4],[26],[33],[43]               $ (11,900,000)          
Investment, Identifier [Axis]: Micronics Filtration Holdings Inc, Preferred Stock, Series C PIK                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33],[43]               54,000 54,000 54,000 54,000 54,000 54,000
Amortized Cost [26],[33],[43]               $ 0          
Fair Value [4],[26],[33],[43]               $ (6,200,000)          
Investment, Identifier [Axis]: Misys Ltd                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[27],[33],[38]               7.25% 7.25% 7.25% 7.25% 7.25% 7.25%
Base Rate Floor [27],[33],[38]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[27],[33],[38]               $ 21,800,000          
Amortized Cost [27],[33],[38]               (20,500,000)          
Fair Value [4],[27],[33],[38]               $ (21,800,000)          
Investment, Identifier [Axis]: Misys Ltd | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 7.25% 7.25% 7.25% 7.25% 7.25% 7.25% 7.25%            
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount $ 46,600,000                        
Amortized Cost (44,600,000)                        
Fair Value $ (38,400,000)                        
Investment, Identifier [Axis]: Misys Ltd 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 3.50% 3.50% 3.50% 3.50% 3.50% 3.50% 3.50% 7.25% 7.25% 7.25% 7.25% 7.25% 7.25%
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount $ 2,300,000             $ 41,200,000          
Amortized Cost (2,100,000)             (38,800,000)          
Fair Value $ (2,000,000.0)             $ (41,200,000)          
Investment, Identifier [Axis]: Misys Ltd, Preferred Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind 10.25% 10.25% 10.25% 10.25% 10.25% 10.25% 10.25% 10.25% [14],[27],[33] 10.25% [14],[27],[33] 10.25% [14],[27],[33] 10.25% [14],[27],[33] 10.25% [14],[27],[33] 10.25% [14],[27],[33]
Number of Shares | shares [27],[33]               79,782,377 79,782,377 79,782,377 79,782,377 79,782,377 79,782,377
Amortized Cost [27],[33]               $ (73,500,000)          
Fair Value [4],[27],[33]               $ (78,900,000)          
Investment, Identifier [Axis]: Misys Ltd, Preferred Stock | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Base Rate Floor 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Number of Shares | shares 24,436,083 24,436,083 24,436,083 24,436,083 24,436,083 24,436,083 24,436,083            
Amortized Cost $ (24,000,000.0)                        
Fair Value $ (21,700,000)                        
Investment, Identifier [Axis]: Misys Ltd, Preferred Stock | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind 10.25% 10.25% 10.25% 10.25% 10.25% 10.25% 10.25% 10.25% [14],[27],[33] 10.25% [14],[27],[33] 10.25% [14],[27],[33] 10.25% [14],[27],[33] 10.25% [14],[27],[33] 10.25% [14],[27],[33]
Investment, Identifier [Axis]: Misys Ltd, Preferred Stock, Equity/Other, Software & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[9] 10.25% 10.25% 10.25% 10.25% 10.25% 10.25% 10.25%            
Base Rate Floor [5],[8],[9] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Number of Shares | shares [8],[9] 62,923,634 62,923,634 62,923,634 62,923,634 62,923,634 62,923,634 62,923,634            
Amortized Cost [8],[9] $ (58,800,000)                        
Fair Value [3],[8],[9] $ (60,200,000)                        
Investment, Identifier [Axis]: Misys Ltd, Preferred Stock, Equity/Other, Software & Services | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[9] 10.25% 10.25% 10.25% 10.25% 10.25% 10.25% 10.25%            
Investment, Identifier [Axis]: Misys Ltd, Senior Secured Loans -Second Lien, Software & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9],[39] 7.25% 7.25% 7.25% 7.25% 7.25% 7.25% 7.25%            
Base Rate Floor [5],[8],[9],[39] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[9],[13],[39] $ 16,300,000                        
Amortized Cost [8],[9],[39] (15,500,000)                        
Fair Value [3],[8],[9],[39] $ (13,400,000)                        
Investment, Identifier [Axis]: Monitronics International Inc | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               5.00% 5.00% 5.00% 5.00% 5.00% 5.00%
Base Rate Floor               1.50% 1.50% 1.50% 1.50% 1.50% 1.50%
Principal amount               $ 35,500,000          
Amortized Cost               (32,900,000)          
Fair Value               $ (35,600,000)          
Investment, Identifier [Axis]: Monitronics International Inc | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Base Rate Floor 1.50% 1.50% 1.50% 1.50% 1.50% 1.50% 1.50%            
Principal amount $ 35,500,000                        
Amortized Cost (33,500,000)                        
Fair Value $ (34,200,000)                        
Investment, Identifier [Axis]: Monitronics International Inc, Senior Secured Loans - First Lien, Commercial & Professional Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[21],[39] 7.50% 7.50% 7.50% 7.50% 7.50% 7.50% 7.50%            
Base Rate Floor [5],[8],[21],[39] 1.30% 1.30% 1.30% 1.30% 1.30% 1.30% 1.30%            
Principal amount [8],[13],[21],[39] $ 18,700,000                        
Amortized Cost [8],[21],[39] (17,500,000)                        
Fair Value [3],[8],[21],[39] $ (12,500,000)                        
Investment, Identifier [Axis]: Monitronics International Inc, Senior Secured Loans - First Lien, Commercial & Professional Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Base Rate Floor [5],[8] 1.50% 1.50% 1.50% 1.50% 1.50% 1.50% 1.50%            
Principal amount [8],[13] $ 58,400,000                        
Amortized Cost [8] (56,400,000)                        
Fair Value [3],[8] $ (54,600,000)                        
Investment, Identifier [Axis]: Monitronics International Inc, Senior Secured Loans - First Lien, Commercial & Professional Services 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Base Rate Floor [5],[20] 1.50% 1.50% 1.50% 1.50% 1.50% 1.50% 1.50%            
Principal amount [13],[20] $ 11,600,000                        
Amortized Cost [20] (11,600,000)                        
Fair Value [3],[20] $ (10,800,000)                        
Investment, Identifier [Axis]: Monitronics International Inc, Senior Secured Loans—First Lien, Commercial & Professional Services -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33],[38],[45]               6.50% 6.50% 6.50% 6.50% 6.50% 6.50%
Base Rate Floor [33],[38],[45]               1.30% 1.30% 1.30% 1.30% 1.30% 1.30%
Principal amount [16],[33],[38],[45]               $ 18,800,000          
Amortized Cost [33],[38],[45]               (17,200,000)          
Fair Value [4],[33],[38],[45]               $ (17,700,000)          
Investment, Identifier [Axis]: Monitronics International Inc, Senior Secured Loans—First Lien, Commercial & Professional Services -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               5.00% 5.00% 5.00% 5.00% 5.00% 5.00%
Base Rate Floor [33]               1.50% 1.50% 1.50% 1.50% 1.50% 1.50%
Principal amount [16],[33]               $ 47,300,000          
Amortized Cost [33]               (44,800,000)          
Fair Value [4],[33]               $ (45,100,000)          
Investment, Identifier [Axis]: Monitronics International Inc, Senior Secured Loans—First Lien, Commercial & Professional Services -3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               5.00% 5.00% 5.00% 5.00% 5.00% 5.00%
Base Rate Floor [15]               1.50% 1.50% 1.50% 1.50% 1.50% 1.50%
Principal amount [15],[16]               $ 22,700,000          
Amortized Cost [15]               (22,700,000)          
Fair Value [4],[15]               $ (21,600,000)          
Investment, Identifier [Axis]: Motion Recruitment Partners LLC | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount $ 24,800,000             $ 25,000,000.0          
Amortized Cost (24,600,000)             (24,700,000)          
Fair Value $ (24,800,000)             $ (24,700,000)          
Investment, Identifier [Axis]: Motion Recruitment Partners LLC, Senior Secured Loans - First Lien, Commercial & Professional Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[10],[21] 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%            
Base Rate Floor [5],[8],[10],[21] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[10],[13],[21] $ 64,200,000                        
Amortized Cost [8],[10],[21] (64,200,000)                        
Fair Value [3],[8],[10],[21] $ (64,000,000.0)                        
Investment, Identifier [Axis]: Motion Recruitment Partners LLC, Senior Secured Loans - First Lien, Commercial & Professional Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[22],[42] 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%            
Base Rate Floor [5],[8],[22],[42] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13],[22],[42] $ 54,800,000                        
Amortized Cost [8],[22],[42] (51,200,000)                        
Fair Value [3],[8],[22],[42] $ (54,700,000)                        
Investment, Identifier [Axis]: Motion Recruitment Partners LLC, Senior Secured Loans - First Lien, Commercial & Professional Services 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13] $ 4,700,000                        
Amortized Cost [8] (4,500,000)                        
Fair Value [3],[8] $ (4,700,000)                        
Investment, Identifier [Axis]: Motion Recruitment Partners LLC, Senior Secured Loans - First Lien, Commercial & Professional Services 4                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[20] $ 59,600,000                        
Amortized Cost [20] (59,600,000)                        
Fair Value [3],[20] $ (59,500,000)                        
Investment, Identifier [Axis]: Motion Recruitment Partners LLC, Senior Secured Loans—First Lien, Commercial & Professional Services - 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[19],[33],[40],[41],[45]               6.50% 6.50% 6.50% 6.50% 6.50% 6.50%
Base Rate Floor [19],[33],[40],[41],[45]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[19],[33],[40],[41],[45]               $ 119,900,000          
Amortized Cost [19],[33],[40],[41],[45]               (115,500,000)          
Fair Value [4],[19],[33],[40],[41],[45]               $ (118,400,000)          
Investment, Identifier [Axis]: Motion Recruitment Partners LLC, Senior Secured Loans—First Lien, Commercial & Professional Services -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               6.50% 6.50% 6.50% 6.50% 6.50% 6.50%
Base Rate Floor [33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33]               $ 4,800,000          
Amortized Cost [33]               (4,500,000)          
Fair Value [4],[33]               $ (4,700,000)          
Investment, Identifier [Axis]: Motion Recruitment Partners LLC, Senior Secured Loans—First Lien, Commercial & Professional Services -3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               6.50% 6.50% 6.50% 6.50% 6.50% 6.50%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 59,600,000          
Amortized Cost [15]               (59,600,000)          
Fair Value [4],[15]               $ (58,900,000)          
Investment, Identifier [Axis]: My Community Homes PropCo 2, Private Equity | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares 35,000,000 35,000,000 35,000,000 35,000,000 35,000,000 35,000,000 35,000,000            
Amortized Cost $ (35,000,000.0)                        
Fair Value $ (35,000,000.0)                        
Investment, Identifier [Axis]: My Community Homes PropCo 2, Private Equity, Asset Based Finance, Real Estate                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[9],[31],[34] 85,000,000 85,000,000 85,000,000 85,000,000 85,000,000 85,000,000 85,000,000            
Amortized Cost [8],[9],[31],[34] $ (85,000,000.0)                        
Fair Value [3],[8],[9],[31],[34] $ (85,000,000.0)                        
Investment, Identifier [Axis]: My Community Homes SFR PropCo 2, Private Equity                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[27],[32],[33]               33,000,000 33,000,000 33,000,000 33,000,000 33,000,000 33,000,000
Amortized Cost [26],[27],[32],[33]               $ (33,000,000.0)          
Fair Value [4],[26],[27],[32],[33]               $ (33,000,000.0)          
Investment, Identifier [Axis]: NBG Home                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Base Rate Floor [33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33]               $ 67,700,000          
Amortized Cost [33]               (67,600,000)          
Fair Value [4],[33]               $ (53,300,000)          
Investment, Identifier [Axis]: NBG Home 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[23],[26],[33]               12.75% 12.75% 12.75% 12.75% 12.75% 12.75%
Base Rate Floor [23],[26],[33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[23],[26],[33]               $ 31,400,000          
Amortized Cost [23],[26],[33]               (28,200,000)          
Fair Value [4],[23],[26],[33]               $ (8,500,000)          
Investment, Identifier [Axis]: NBG Home, Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33]               1,903 1,903 1,903 1,903 1,903 1,903
Amortized Cost [26],[33]               $ (2,600,000)          
Fair Value [4],[26],[33]               $ 0          
Investment, Identifier [Axis]: NBG Home, Common Stock, Equity/Other, Consumer Durables & Apparel                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[31] 1,903 1,903 1,903 1,903 1,903 1,903 1,903            
Amortized Cost [8],[31] $ (2,400,000)                        
Fair Value [3],[8],[31] $ 0                        
Investment, Identifier [Axis]: NBG Home, Senior Secured Loans - First Lien, Consumer Durables & Apparel                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[28],[31] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[8],[28],[31] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13],[28],[31] $ 76,400,000                        
Amortized Cost [8],[28],[31] (71,900,000)                        
Fair Value [3],[8],[28],[31] $ (28,000,000.0)                        
Investment, Identifier [Axis]: NBG Home, Senior Secured Loans -Second Lien, Consumer Durables & Apparel                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[28],[31] 12.75% 12.75% 12.75% 12.75% 12.75% 12.75% 12.75%            
Base Rate Floor [5],[8],[28],[31] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13],[28],[31] $ 34,600,000                        
Amortized Cost [8],[28],[31] (29,400,000)                        
Fair Value [3],[8],[28],[31] $ (100,000)                        
Investment, Identifier [Axis]: NCI Inc                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               7.50% 7.50% 7.50% 7.50% 7.50% 7.50%
Interest rate, paid in kind [14],[33]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Base Rate Floor [33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33]               $ 78,800,000          
Amortized Cost [33]               (77,700,000)          
Fair Value [4],[33]               $ (72,000,000.0)          
Investment, Identifier [Axis]: NCI Inc | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[33]               2.50% 2.50% 2.50% 2.50% 2.50% 2.50%
Investment, Identifier [Axis]: NCI Inc, Senior Secured Loans - First Lien, Software & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 7.50% 7.50% 7.50% 7.50% 7.50% 7.50% 7.50%            
Interest rate, paid in kind [5],[8] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13] $ 77,300,000                        
Amortized Cost [8] (76,400,000)                        
Fair Value [3],[8] $ (55,200,000)                        
Investment, Identifier [Axis]: NCI Inc, Senior Secured Loans - First Lien, Software & Services | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8] 2.50% 2.50% 2.50% 2.50% 2.50% 2.50% 2.50%            
Investment, Identifier [Axis]: NEP Broadcasting LLC | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 7.00% 7.00% 7.00% 7.00% 7.00% 7.00% 7.00% 7.00% 7.00% 7.00% 7.00% 7.00% 7.00%
Base Rate Floor 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount $ 6,800,000             $ 6,800,000          
Amortized Cost (6,700,000)             (6,700,000)          
Fair Value $ (6,300,000)             $ (6,700,000)          
Investment, Identifier [Axis]: NPD Group Inc/The, Senior Secured Loans - First Lien, Consumer Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 3.50% 3.50% 3.50% 3.50% 3.50% 3.50% 3.50%            
Interest rate, paid in kind [5],[8] 2.80% 2.80% 2.80% 2.80% 2.80% 2.80% 2.80%            
Base Rate Floor [5],[8] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[13] $ 19,000,000.0                        
Amortized Cost [8] (19,000,000.0)                        
Fair Value [3],[8] $ (19,000,000.0)                        
Investment, Identifier [Axis]: NPD Group Inc/The, Senior Secured Loans - First Lien, Consumer Services 1 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8] 2.80% 2.80% 2.80% 2.80% 2.80% 2.80% 2.80%            
Investment, Identifier [Axis]: NPD Group Inc/The, Senior Secured Loans - First Lien, Consumer Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [13],[20] $ 1,000,000.0                        
Amortized Cost [20] (1,000,000.0)                        
Fair Value [3],[20] $ (1,000,000.0)                        
Investment, Identifier [Axis]: Net Documents, Senior Secured Loans - First Lien, Software & Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13] $ 24,600,000                        
Amortized Cost [8] (24,400,000)                        
Fair Value [3],[8] $ (24,000,000.0)                        
Investment, Identifier [Axis]: Net Documents, Senior Secured Loans - First Lien, Software & Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13] $ 2,000,000.0                        
Amortized Cost [8] (2,000,000.0)                        
Fair Value [3],[8] $ (2,000,000.0)                        
Investment, Identifier [Axis]: Net Documents, Senior Secured Loans - First Lien, Software & Services 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[20] $ 7,400,000                        
Amortized Cost [20] (7,300,000)                        
Fair Value [3],[20] $ (7,200,000)                        
Investment, Identifier [Axis]: Net Documents, Senior Secured Loans - First Lien, Software & Services 4                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[20] $ 900,000                        
Amortized Cost [20] (900,000)                        
Fair Value [3],[20] $ (900,000)                        
Investment, Identifier [Axis]: Net Documents, Senior Secured Loans—First Lien, Software & Services -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               6.50% 6.50% 6.50% 6.50% 6.50% 6.50%
Base Rate Floor [33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33]               $ 24,600,000          
Amortized Cost [33]               (24,400,000)          
Fair Value [4],[33]               $ (24,300,000)          
Investment, Identifier [Axis]: Net Documents, Senior Secured Loans—First Lien, Software & Services -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               6.75% 6.75% 6.75% 6.75% 6.75% 6.75%
Base Rate Floor [33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33]               $ 900,000          
Amortized Cost [33]               (900,000)          
Fair Value [4],[33]               $ (900,000)          
Investment, Identifier [Axis]: Net Documents, Senior Secured Loans—First Lien, Software & Services -3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               6.75% 6.75% 6.75% 6.75% 6.75% 6.75%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 2,100,000          
Amortized Cost [15]               (2,100,000)          
Fair Value [4],[15]               $ (2,000,000.0)          
Investment, Identifier [Axis]: Net Documents, Senior Secured Loans—First Lien, Software & Services -4                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               6.75% 6.75% 6.75% 6.75% 6.75% 6.75%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 7,400,000          
Amortized Cost [15]               (7,300,000)          
Fair Value [4],[15]               $ (7,300,000)          
Investment, Identifier [Axis]: New Era Technology Inc | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount $ 34,400,000             $ 10,000,000.0          
Amortized Cost (33,900,000)             (10,000,000.0)          
Fair Value $ (33,800,000)             $ (10,000,000.0)          
Investment, Identifier [Axis]: New Era Technology Inc, Senior Secured Loans - First Lien, Software & Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[10],[12],[22],[42] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor [5],[8],[10],[12],[22],[42] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[10],[12],[13],[22],[42] $ 51,200,000                        
Amortized Cost [8],[10],[12],[22],[42] (49,700,000)                        
Fair Value [3],[8],[10],[12],[22],[42] $ (50,300,000)                        
Investment, Identifier [Axis]: New Era Technology Inc, Senior Secured Loans - First Lien, Software & Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13] $ 2,100,000                        
Amortized Cost [8] (2,100,000)                        
Fair Value [3],[8] $ (2,100,000)                        
Investment, Identifier [Axis]: New Era Technology Inc, Senior Secured Loans - First Lien, Software & Services 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[20] $ 2,600,000                        
Amortized Cost [20] (2,600,000)                        
Fair Value [3],[20] $ (2,500,000)                        
Investment, Identifier [Axis]: New Era Technology Inc, Senior Secured Loans—First Lien, Software & Services - 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 13,800,000          
Amortized Cost [15]               (13,800,000)          
Fair Value [4],[15]               $ (13,700,000)          
Investment, Identifier [Axis]: New Era Technology Inc, Senior Secured Loans—First Lien, Software & Services - 4                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 3,100,000          
Amortized Cost [15]               (3,100,000)          
Fair Value [4],[15]               $ (3,100,000)          
Investment, Identifier [Axis]: New Era Technology Inc, Senior Secured Loans—First Lien, Software & Services -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[18],[19],[33],[40],[41]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor [18],[19],[33],[40],[41]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[18],[19],[33],[40],[41]               $ 82,500,000          
Amortized Cost [18],[19],[33],[40],[41]               (78,600,000)          
Fair Value [4],[18],[19],[33],[40],[41]               $ (82,100,000)          
Investment, Identifier [Axis]: New Era Technology Inc, Senior Secured Loans—First Lien, Software & Services -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor [33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33]               $ 1,600,000          
Amortized Cost [33]               (1,500,000)          
Fair Value [4],[33]               (1,600,000)          
Investment, Identifier [Axis]: NewStar Clarendon 2014-1A Class D                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Principal amount [16],[27],[33]               8,300,000          
Amortized Cost [27],[33]               (2,500,000)          
Fair Value [4],[27],[33]               $ (4,200,000)          
Investment, Identifier [Axis]: NewStar Clarendon 2014-1A Class D | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 18.20% 18.20% 18.20% 18.20% 18.20% 18.20% 18.20%            
Principal amount $ 30,000,000.0                        
Amortized Cost (9,300,000)                        
Fair Value $ (12,600,000)                        
Investment, Identifier [Axis]: NewStar Clarendon 2014-1A Class D 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               1830.00% 1830.00% 1830.00% 1830.00% 1830.00% 1830.00%
Investment, Identifier [Axis]: NewStar Clarendon 2014-1A Class D 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Principal amount               $ 30,000,000.0          
Amortized Cost               (9,300,000)          
Fair Value               $ (15,300,000)          
Investment, Identifier [Axis]: NewStar Clarendon 2014-1A Class D, Asset Based Finance, Diversified Financials                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9] 19.70% 19.70% 19.70% 19.70% 19.70% 19.70% 19.70%            
Principal amount | € [8],[9],[13]       € 8.3                  
Amortized Cost [8],[9] $ (2,500,000)                        
Fair Value [3],[8],[9] $ (3,500,000)                        
Investment, Identifier [Axis]: Nine West Holdings Inc, Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33]               5,451 5,451 5,451 5,451 5,451 5,451
Amortized Cost [26],[33]               $ (6,500,000)          
Fair Value [4],[26],[33]               $ 0          
Investment, Identifier [Axis]: Nine West Holdings Inc, Common Stock, Equity/Other, Consumer Durables & Apparel                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[31] 5,451 5,451 5,451 5,451 5,451 5,451 5,451            
Amortized Cost [8],[31] $ (6,400,000)                        
Fair Value [3],[8],[31] $ 0                        
Investment, Identifier [Axis]: Novotech Pty Ltd 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%            
Base Rate Floor 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%            
Principal amount $ 24,400,000                        
Amortized Cost (23,900,000)                        
Fair Value $ (23,900,000)                        
Investment, Identifier [Axis]: Novotech Pty Ltd 2 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%            
Base Rate Floor 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%            
Principal amount           $ 33.7              
Amortized Cost $ (24,800,000)                        
Fair Value $ (21,000,000.0)                        
Investment, Identifier [Axis]: Novotech Pty Ltd, Senior Secured Loans - First Lien, Health Care Equipment & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[9],[20] 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%            
Base Rate Floor [5],[9],[20] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%            
Principal amount [9],[13],[20] $ 5,700,000                        
Amortized Cost [9],[20] (5,600,000)                        
Fair Value [3],[9],[20] $ (5,500,000)                        
Investment, Identifier [Axis]: OEConnection LLC | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 7.00% 7.00% 7.00% 7.00% 7.00% 7.00% 7.00% 8.25% 8.25% 8.25% 8.25% 8.25% 8.25%
Base Rate Floor 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount $ 50,000,000.0             $ 50,000,000.0          
Amortized Cost (50,000,000.0)             (50,000,000.0)          
Fair Value $ (48,500,000)             $ (49,100,000)          
Investment, Identifier [Axis]: OEConnection LLC, Senior Secured Loans -Second Lien, Software & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[21] 7.00% 7.00% 7.00% 7.00% 7.00% 7.00% 7.00%            
Base Rate Floor [5],[8],[21] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%            
Principal amount [8],[13],[21] $ 76,100,000                        
Amortized Cost [8],[21] (75,700,000)                        
Fair Value [3],[8],[21] $ (73,800,000)                        
Investment, Identifier [Axis]: OEConnection LLC, Senior Secured Loans—Second Lien, Software & Services - 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               7.00% 7.00% 7.00% 7.00% 7.00% 7.00%
Base Rate Floor [33]               0.50% 0.50% 0.50% 0.50% 0.50% 0.50%
Principal amount [16],[33]               $ 49,000,000.0          
Amortized Cost [33]               (49,000,000.0)          
Fair Value [4],[33]               $ (48,100,000)          
Investment, Identifier [Axis]: OEConnection LLC, Senior Secured Loans—Second Lien, Software & Services -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33],[45]               8.25% 8.25% 8.25% 8.25% 8.25% 8.25%
Base Rate Floor [33],[45]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount [16],[33],[45]               $ 27,000,000.0          
Amortized Cost [33],[45]               (26,600,000)          
Fair Value [4],[33],[45]               $ (26,500,000)          
Investment, Identifier [Axis]: Omnimax International Inc                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[17],[18],[19],[33],[41],[45]               7.25% 7.25% 7.25% 7.25% 7.25% 7.25%
Base Rate Floor [17],[18],[19],[33],[41],[45]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[17],[18],[19],[33],[41],[45]               $ 218,500,000          
Amortized Cost [17],[18],[19],[33],[41],[45]               (209,200,000)          
Fair Value [4],[17],[18],[19],[33],[41],[45]               $ (217,000,000.0)          
Investment, Identifier [Axis]: Omnimax International Inc, Senior Secured Loans - First Lien, Capital Goods 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[10],[11],[12],[21],[42] 8.50% 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%            
Base Rate Floor [5],[8],[10],[11],[12],[21],[42] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[10],[11],[12],[13],[21],[42] $ 155,600,000                        
Amortized Cost [8],[10],[11],[12],[21],[42] (149,700,000)                        
Fair Value [3],[8],[10],[11],[12],[21],[42] $ (148,600,000)                        
Investment, Identifier [Axis]: Omnimax International Inc, Senior Secured Loans - First Lien, Capital Goods 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13] $ 22,100,000                        
Amortized Cost [8] (21,100,000)                        
Fair Value [3],[8] $ (21,100,000)                        
Investment, Identifier [Axis]: Omnimax International Inc, Senior Secured Loans - First Lien, Capital Goods 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13] $ 14,600,000                        
Amortized Cost [8] (13,900,000)                        
Fair Value [3],[8] $ (14,000,000.0)                        
Investment, Identifier [Axis]: One Call Care Management Inc | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind 8.50% 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%            
Principal amount $ 24,500,000                        
Amortized Cost (24,000,000.0)                        
Fair Value $ (21,200,000)                        
Investment, Identifier [Axis]: One Call Care Management Inc | Maximum | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind 8.50% 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%            
Investment, Identifier [Axis]: One Call Care Management Inc 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[32],[33],[38]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Base Rate Floor [32],[33],[38]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [16],[32],[33],[38]               $ 5,000,000.0          
Amortized Cost [32],[33],[38]               (4,700,000)          
Fair Value [4],[32],[33],[38]               $ (5,000,000.0)          
Investment, Identifier [Axis]: One Call Care Management Inc 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount $ 4,900,000                        
Amortized Cost (5,000,000.0)                        
Fair Value $ (3,700,000)                        
Investment, Identifier [Axis]: One Call Care Management Inc 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[32],[33]               8.50% 8.50% 8.50% 8.50% 8.50% 8.50%
Principal amount [16],[32],[33]               $ 23,500,000          
Amortized Cost [32],[33]               (21,600,000)          
Fair Value [4],[32],[33]               $ (23,500,000)          
Investment, Identifier [Axis]: One Call Care Management Inc 2 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 4.00% 4.00% 4.00% 4.00% 4.00% 4.00% 4.00%            
Interest rate, paid in kind               850.00% 850.00% 850.00% 850.00% 850.00% 850.00%
Base Rate Floor 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount $ 2,100,000             $ 23,500,000          
Amortized Cost (1,900,000)             (22,900,000)          
Fair Value $ (2,100,000)             $ (23,500,000)          
Investment, Identifier [Axis]: One Call Care Management Inc 2 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[32],[33]               8.50% 8.50% 8.50% 8.50% 8.50% 8.50%
Investment, Identifier [Axis]: One Call Care Management Inc 2 | Maximum | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind               850.00% 850.00% 850.00% 850.00% 850.00% 850.00%
Investment, Identifier [Axis]: One Call Care Management Inc 3 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Base Rate Floor               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount               $ 5,000,000.0          
Amortized Cost               (5,000,000.0)          
Fair Value               $ (5,000,000.0)          
Investment, Identifier [Axis]: One Call Care Management Inc, Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[32],[33]               34,872 34,872 34,872 34,872 34,872 34,872
Amortized Cost [26],[32],[33]               $ (2,100,000)          
Fair Value [4],[26],[32],[33]               $ (2,400,000)          
Investment, Identifier [Axis]: One Call Care Management Inc, Common Stock | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares 34,873 34,873 34,873 34,873 34,873 34,873 34,873            
Amortized Cost $ (2,200,000)                        
Fair Value $ (2,100,000)                        
Investment, Identifier [Axis]: One Call Care Management Inc, Common Stock 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares               34,873 34,873 34,873 34,873 34,873 34,873
Amortized Cost               $ (2,200,000)          
Fair Value               $ (2,400,000)          
Investment, Identifier [Axis]: One Call Care Management Inc, Common Stock, Equity/Other, Health Care Equipment & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[31],[34] 34,872 34,872 34,872 34,872 34,872 34,872 34,872            
Amortized Cost [8],[31],[34] $ (2,100,000)                        
Fair Value [3],[8],[31],[34] $ (2,100,000)                        
Investment, Identifier [Axis]: One Call Care Management Inc, Other Senior Debt, Health Care Equipment & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[34] 8.50% 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%            
Principal amount [8],[13],[34] $ 24,500,000                        
Amortized Cost [8],[34] (22,800,000)                        
Fair Value [3],[8],[34] $ (21,200,000)                        
Investment, Identifier [Axis]: One Call Care Management Inc, Other Senior Debt, Health Care Equipment & Services | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[34] 8.50% 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%            
Investment, Identifier [Axis]: One Call Care Management Inc, Preferred Stock A                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[32],[33]               371,992 371,992 371,992 371,992 371,992 371,992
Amortized Cost [26],[32],[33]               $ (22,800,000)          
Fair Value [4],[26],[32],[33]               $ (26,100,000)          
Investment, Identifier [Axis]: One Call Care Management Inc, Preferred Stock A | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares 371,993 371,993 371,993 371,993 371,993 371,993 371,993            
Amortized Cost $ (23,700,000)                        
Fair Value $ (22,500,000)                        
Investment, Identifier [Axis]: One Call Care Management Inc, Preferred Stock A 2 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares               371,993 371,993 371,993 371,993 371,993 371,993
Amortized Cost               $ (23,700,000)          
Fair Value               $ (26,100,000)          
Investment, Identifier [Axis]: One Call Care Management Inc, Preferred Stock A, Equity/Other, Health Care Equipment & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[31],[34] 371,992 371,992 371,992 371,992 371,992 371,992 371,992            
Amortized Cost [8],[31],[34] $ (22,800,000)                        
Fair Value [3],[8],[31],[34] $ (22,500,000)                        
Investment, Identifier [Axis]: One Call Care Management Inc, Preferred Stock B                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 9.00% 9.00% 9.00% 9.00% 9.00% 9.00% 9.00%            
Investment, Identifier [Axis]: One Call Care Management Inc, Preferred Stock B | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares 7,672,346 7,672,346 7,672,346 7,672,346 7,672,346 7,672,346 7,672,346            
Amortized Cost $ (8,700,000)                        
Fair Value $ (7,700,000)                        
Investment, Identifier [Axis]: One Call Care Management Inc, Preferred Stock B | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 9.00% 9.00% 9.00% 9.00% 9.00% 9.00% 9.00%            
Investment, Identifier [Axis]: One Call Care Management Inc, Preferred Stock B 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[32],[33]               9.00% 9.00% 9.00% 9.00% 9.00% 9.00%
Number of Shares | shares [32],[33]               7,672,347 7,672,347 7,672,347 7,672,347 7,672,347 7,672,347
Amortized Cost [32],[33]               $ (8,000,000.0)          
Fair Value [4],[32],[33]               $ (9,200,000)          
Investment, Identifier [Axis]: One Call Care Management Inc, Preferred Stock B 1 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[32],[33]               9.00% 9.00% 9.00% 9.00% 9.00% 9.00%
Investment, Identifier [Axis]: One Call Care Management Inc, Preferred Stock B 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind               900.00% 900.00% 900.00% 900.00% 900.00% 900.00%
Investment, Identifier [Axis]: One Call Care Management Inc, Preferred Stock B 2 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares               7,672,346 7,672,346 7,672,346 7,672,346 7,672,346 7,672,346
Amortized Cost               $ (8,800,000)          
Fair Value               $ (9,200,000)          
Investment, Identifier [Axis]: One Call Care Management Inc, Preferred Stock B 2 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind               900.00% 900.00% 900.00% 900.00% 900.00% 900.00%
Investment, Identifier [Axis]: One Call Care Management Inc, Preferred Stock B, Equity/Other, Health Care Equipment & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[34] 9.00% 9.00% 9.00% 9.00% 9.00% 9.00% 9.00%            
Number of Shares | shares [8],[34] 7,672,347 7,672,347 7,672,347 7,672,347 7,672,347 7,672,347 7,672,347            
Amortized Cost [8],[34] $ (8,000,000.0)                        
Fair Value [3],[8],[34] $ (7,700,000)                        
Investment, Identifier [Axis]: One Call Care Management Inc, Preferred Stock B, Equity/Other, Health Care Equipment & Services | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[34] 9.00% 9.00% 9.00% 9.00% 9.00% 9.00% 9.00%            
Investment, Identifier [Axis]: One Call Care Management Inc, Senior Secured Loans - First Lien, Health Care Equipment & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[34],[39] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[8],[34],[39] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[13],[34],[39] $ 4,900,000                        
Amortized Cost [8],[34],[39] (4,700,000)                        
Fair Value [3],[8],[34],[39] $ (3,700,000)                        
Investment, Identifier [Axis]: Ontic Engineering & Manufacturing Inc | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               4.00% 4.00% 4.00% 4.00% 4.00% 4.00%
Base Rate Floor               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount               $ 2,100,000          
Amortized Cost               (1,900,000)          
Fair Value               (2,100,000)          
Investment, Identifier [Axis]: Opendoor Labs Inc, Structured Mezzanine, Asset Based Finance, Real Estate - 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Principal amount [15],[16],[27]               88,900,000          
Amortized Cost [15],[27]               (88,900,000)          
Fair Value [4],[15],[27]               (88,900,000)          
Investment, Identifier [Axis]: Opendoor Labs Inc, Structured Mezzanine, Asset Based Finance, Real Estate -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Principal amount [16],[27],[33]               71,100,000          
Amortized Cost [27],[33]               (71,100,000)          
Fair Value [4],[27],[33]               $ (71,100,000)          
Investment, Identifier [Axis]: Opendoor Labs Inc, Structured Mezzanine, Asset Based Finance, Real Estate 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9] 10.00% 10.00% 10.00% 10.00% 10.00% 10.00% 10.00%            
Principal amount [8],[9],[13] $ 106,600,000                        
Amortized Cost [8],[9] (106,600,000)                        
Fair Value [3],[8],[9] $ (101,600,000)                        
Investment, Identifier [Axis]: Opendoor Labs Inc, Structured Mezzanine, Asset Based Finance, Real Estate 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[9],[20] 10.00% 10.00% 10.00% 10.00% 10.00% 10.00% 10.00%            
Principal amount [9],[13],[20] $ 53,400,000                        
Amortized Cost [9],[20] (53,400,000)                        
Fair Value [3],[9],[20] $ (50,900,000)                        
Investment, Identifier [Axis]: Orchard Marine Limited, Class B Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[27],[33],[43]               1,964 1,964 1,964 1,964 1,964 1,964
Amortized Cost [26],[27],[33],[43]               $ (3,100,000)          
Fair Value [4],[26],[27],[33],[43]               $ 0          
Investment, Identifier [Axis]: Orchard Marine Limited, Series A Preferred Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[27],[33],[43]               62,976 62,976 62,976 62,976 62,976 62,976
Amortized Cost [26],[27],[33],[43]               $ (62,000,000.0)          
Fair Value [4],[26],[27],[33],[43]               $ (64,600,000)          
Investment, Identifier [Axis]: Oxford Global Resources LLC, Senior Secured Loans - First Lien, Commercial & Professional Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[11],[12],[21],[22],[42] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Base Rate Floor [5],[11],[12],[21],[22],[42] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [11],[12],[13],[21],[22],[42] $ 87,700,000                        
Amortized Cost [11],[12],[21],[22],[42] (87,000,000.0)                        
Fair Value [3],[11],[12],[21],[22],[42] $ (87,200,000)                        
Investment, Identifier [Axis]: Oxford Global Resources LLC, Senior Secured Loans - First Lien, Commercial & Professional Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13] $ 3,200,000                        
Amortized Cost [8] (3,200,000)                        
Fair Value [3],[8] $ (3,200,000)                        
Investment, Identifier [Axis]: Oxford Global Resources LLC, Senior Secured Loans - First Lien, Commercial & Professional Services 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[20] $ 15,300,000                        
Amortized Cost [20] (15,300,000)                        
Fair Value [3],[20] $ (15,200,000)                        
Investment, Identifier [Axis]: Oxford Global Resources LLC, Senior Secured Loans - First Lien, Commercial & Professional Services 4                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[20] $ 4,400,000                        
Amortized Cost [20] (4,400,000)                        
Fair Value [3],[20] $ (4,400,000)                        
Investment, Identifier [Axis]: Oxford Global Resources LLC, Senior Secured Loans—First Lien, Commercial & Professional Services - 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 15,300,000          
Amortized Cost [15]               (15,300,000)          
Fair Value [4],[15]               $ (15,300,000)          
Investment, Identifier [Axis]: Oxford Global Resources LLC, Senior Secured Loans—First Lien, Commercial & Professional Services - 4                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 3,700,000          
Amortized Cost [15]               (3,700,000)          
Fair Value [4],[15]               $ (3,700,000)          
Investment, Identifier [Axis]: Oxford Global Resources LLC, Senior Secured Loans—First Lien, Commercial & Professional Services -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[17],[18],[40],[41],[45]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Base Rate Floor [17],[18],[40],[41],[45]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[17],[18],[40],[41],[45]               $ 88,400,000          
Amortized Cost [17],[18],[40],[41],[45]               (87,600,000)          
Fair Value [4],[17],[18],[40],[41],[45]               $ (88,200,000)          
Investment, Identifier [Axis]: Oxford Global Resources LLC, Senior Secured Loans—First Lien, Commercial & Professional Services -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Base Rate Floor [33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33]               $ 4,000,000.0          
Amortized Cost [33]               (4,000,000.0)          
Fair Value [4],[33]               $ (4,000,000.0)          
Investment, Identifier [Axis]: P2 Energy Solutions Inc., Senior Secured Loans - First Lien, Software & Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 6.75% 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13] $ 3,700,000                        
Amortized Cost [8] (3,500,000)                        
Fair Value [3],[8] $ (3,700,000)                        
Investment, Identifier [Axis]: P2 Energy Solutions Inc., Senior Secured Loans - First Lien, Software & Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[10],[11],[22],[37],[42] 6.75% 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%            
Base Rate Floor [5],[8],[10],[11],[22],[37],[42] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[10],[11],[13],[22],[37],[42] $ 247,200,000                        
Amortized Cost [8],[10],[11],[22],[37],[42] (233,200,000)                        
Fair Value [3],[8],[10],[11],[22],[37],[42] $ (242,600,000)                        
Investment, Identifier [Axis]: P2 Energy Solutions Inc., Senior Secured Loans - First Lien, Software & Services 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 6.75% 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[20] $ 11,400,000                        
Amortized Cost [20] (11,400,000)                        
Fair Value [3],[20] $ (11,200,000)                        
Investment, Identifier [Axis]: P2 Energy Solutions Inc., Senior Secured Loans—First Lien, Software & Services - 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               6.75% 6.75% 6.75% 6.75% 6.75% 6.75%
Base Rate Floor [33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33]               $ 4,600,000          
Amortized Cost [33]               (4,300,000)          
Fair Value [4],[33]               $ (4,200,000)          
Investment, Identifier [Axis]: P2 Energy Solutions Inc., Senior Secured Loans—First Lien, Software & Services - 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[17],[19],[33],[35],[40],[41],[45]               6.75% 6.75% 6.75% 6.75% 6.75% 6.75%
Base Rate Floor [17],[19],[33],[35],[40],[41],[45]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[17],[19],[33],[35],[40],[41],[45]               $ 249,100,000          
Amortized Cost [17],[19],[33],[35],[40],[41],[45]               (232,700,000)          
Fair Value [4],[17],[19],[33],[35],[40],[41],[45]               $ (232,000,000.0)          
Investment, Identifier [Axis]: P2 Energy Solutions Inc., Senior Secured Loans—First Lien, Software & Services - 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               6.75% 6.75% 6.75% 6.75% 6.75% 6.75%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 10,600,000          
Amortized Cost [15]               (10,600,000)          
Fair Value [4],[15]               $ (9,900,000)          
Investment, Identifier [Axis]: PRG III LLC, Preferred Stock, Series A PIK                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[32],[33]               434,250 434,250 434,250 434,250 434,250 434,250
Amortized Cost [26],[32],[33]               $ (18,100,000)          
Fair Value [4],[26],[32],[33]               $ (17,400,000)          
Investment, Identifier [Axis]: PRG III LLC, Preferred Stock, Series A PIK, Equity/Other, Media & Entertainment                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[31],[34] 434,250 434,250 434,250 434,250 434,250 434,250 434,250            
Amortized Cost [8],[31],[34] $ (18,100,000)                        
Fair Value [3],[8],[31],[34] $ (63,400,000)                        
Investment, Identifier [Axis]: PRG III LLC, Preferred Stock, Series B PIK                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[32],[33]               140 140 140 140 140 140
Amortized Cost [26],[32],[33]               $ 0          
Fair Value [4],[26],[32],[33]               $ 0          
Investment, Identifier [Axis]: PRG III LLC, Preferred Stock, Series B PIK, Equity/Other, Media & Entertainment                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[31],[34] 140 140 140 140 140 140 140            
Amortized Cost [8],[31],[34] $ 0                        
Fair Value [3],[8],[31],[34] $ 0                        
Investment, Identifier [Axis]: PSKW LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[18],[19],[33],[35],[40]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor [18],[19],[33],[35],[40]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[18],[19],[33],[35],[40]               $ 294,700,000          
Amortized Cost [18],[19],[33],[35],[40]               (283,500,000)          
Fair Value [4],[18],[19],[33],[35],[40]               $ (294,700,000)          
Investment, Identifier [Axis]: PSKW LLC (dba ConnectiveRx), Senior Secured Loans - First Lien, Health Care Equipment & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[10],[12],[22],[37] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor [5],[8],[10],[12],[22],[37] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[10],[12],[13],[22],[37] $ 292,500,000                        
Amortized Cost [8],[10],[12],[22],[37] (283,000,000.0)                        
Fair Value [3],[8],[10],[12],[22],[37] $ (292,500,000)                        
Investment, Identifier [Axis]: Pantherx Specialty LLC | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%            
Principal amount $ 15,900,000                        
Amortized Cost (14,800,000)                        
Fair Value $ (14,900,000)                        
Investment, Identifier [Axis]: Paradigm Acquisition Corp | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 7.50% 7.50% 7.50% 7.50% 7.50% 7.50% 7.50% 7.50% 7.50% 7.50% 7.50% 7.50% 7.50%
Base Rate Floor 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount $ 2,500,000             $ 2,500,000          
Amortized Cost (2,500,000)             (2,500,000)          
Fair Value $ (2,500,000)             $ (2,500,000)          
Investment, Identifier [Axis]: Parata Systems | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount               $ 57,900,000          
Amortized Cost               (57,700,000)          
Fair Value               $ (58,000,000.0)          
Investment, Identifier [Axis]: Parata Systems, Senior Secured Loans—First Lien, Health Care Equipment & Services -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33],[41],[45]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor [33],[41],[45]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33],[41],[45]               $ 73,900,000          
Amortized Cost [33],[41],[45]               (73,400,000)          
Fair Value [4],[33],[41],[45]               $ (74,100,000)          
Investment, Identifier [Axis]: Parata Systems, Senior Secured Loans—First Lien, Health Care Equipment & Services -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 22,000,000.0          
Amortized Cost [15]               (22,000,000.0)          
Fair Value [4],[15]               $ (22,100,000)          
Investment, Identifier [Axis]: Parata Systems, Senior Secured Loans—First Lien, Health Care Equipment & Services -3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 5,500,000          
Amortized Cost [15]               (5,500,000)          
Fair Value [4],[15]               $ (5,500,000)          
Investment, Identifier [Axis]: Parts Town LLC | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount $ 49,600,000                        
Amortized Cost (48,500,000)                        
Fair Value $ (48,000,000.0)                        
Investment, Identifier [Axis]: Parts Town LLC, Senior Secured Loans - First Lien, Retailing                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[8] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[13] $ 100,600,000                        
Amortized Cost [8] (99,700,000)                        
Fair Value [3],[8] $ (97,400,000)                        
Investment, Identifier [Axis]: Parts Town LLC, Senior Secured Loans—First Lien, Retailing - 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Base Rate Floor [33]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [16],[33]               $ 87,400,000          
Amortized Cost [33]               (86,600,000)          
Fair Value [4],[33]               $ (86,600,000)          
Investment, Identifier [Axis]: Parts Town LLC, Senior Secured Loans—First Lien, Retailing - 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Base Rate Floor [15]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [15],[16]               $ 63,900,000          
Amortized Cost [15]               (63,900,000)          
Fair Value [4],[15]               $ (63,300,000)          
Investment, Identifier [Axis]: PartsSource Inc, Senior Secured Loans - First Lien, Health Care Equipment & Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[8] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[13] $ 65,300,000                        
Amortized Cost [8] (64,600,000)                        
Fair Value [3],[8] $ (64,100,000)                        
Investment, Identifier [Axis]: PartsSource Inc, Senior Secured Loans - First Lien, Health Care Equipment & Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [13],[20] $ 4,300,000                        
Amortized Cost [20] (4,200,000)                        
Fair Value [3],[20] $ (4,200,000)                        
Investment, Identifier [Axis]: PartsSource Inc, Senior Secured Loans - First Lien, Health Care Equipment & Services 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [13],[20] $ 22,900,000                        
Amortized Cost [20] (22,600,000)                        
Fair Value [3],[20] $ (22,500,000)                        
Investment, Identifier [Axis]: PartsSource Inc, Senior Secured Loans—First Lien, Health Care Equipment & Services -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor [33]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [16],[33]               $ 65,800,000          
Amortized Cost [33]               (65,000,000.0)          
Fair Value [4],[33]               $ (64,700,000)          
Investment, Identifier [Axis]: PartsSource Inc, Senior Secured Loans—First Lien, Health Care Equipment & Services -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor [15]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [15],[16]               $ 4,300,000          
Amortized Cost [15]               (4,200,000)          
Fair Value [4],[15]               $ (4,200,000)          
Investment, Identifier [Axis]: PartsSource Inc, Senior Secured Loans—First Lien, Health Care Equipment & Services -3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor [15]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [15],[16]               $ 22,900,000          
Amortized Cost [15]               (22,600,000)          
Fair Value [4],[15]               $ (22,500,000)          
Investment, Identifier [Axis]: Peraton Corp                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33],[38]               3.75% 3.75% 3.75% 3.75% 3.75% 3.75%
Base Rate Floor [33],[38]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [16],[33],[38]               $ 9,000,000.0          
Amortized Cost [33],[38]               (8,700,000)          
Fair Value [4],[33],[38]               $ (9,000,000.0)          
Investment, Identifier [Axis]: Peraton Corp | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 3.75% 3.75% 3.75% 3.75% 3.75% 3.75% 3.75%            
Base Rate Floor 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount $ 8,800,000                        
Amortized Cost (8,400,000)                        
Fair Value $ (8,400,000)                        
Investment, Identifier [Axis]: Peraton Corp 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 7.75% 7.75% 7.75% 7.75% 7.75% 7.75% 7.75%            
Base Rate Floor 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount $ 21,500,000                        
Amortized Cost (21,300,000)                        
Fair Value $ (21,300,000)                        
Investment, Identifier [Axis]: Peraton Corp, Senior Secured Loans -Second Lien, Capital Goods 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[37] 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%            
Base Rate Floor [5],[8],[37] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13],[37] $ 175,000,000.0                        
Amortized Cost [8],[37] (166,000,000.0)                        
Fair Value [3],[8],[37] $ (172,000,000.0)                        
Investment, Identifier [Axis]: Peraton Corp, Senior Secured Loans -Second Lien, Capital Goods 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 7.75% 7.75% 7.75% 7.75% 7.75% 7.75% 7.75%            
Base Rate Floor [5],[8] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[13] $ 130,400,000                        
Amortized Cost [8] (124,700,000)                        
Fair Value [3],[8] $ (129,400,000)                        
Investment, Identifier [Axis]: Peraton Corp, Senior Secured Loans—Second Lien, Capital Goods - 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33],[35]               8.00% 8.00% 8.00% 8.00% 8.00% 8.00%
Base Rate Floor [33],[35]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33],[35]               $ 175,000,000.0          
Amortized Cost [33],[35]               (165,300,000)          
Fair Value [4],[33],[35]               $ (178,500,000)          
Investment, Identifier [Axis]: Peraton Corp, Senior Secured Loans—Second Lien, Capital Goods - 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               7.75% 7.75% 7.75% 7.75% 7.75% 7.75%
Base Rate Floor [33]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [16],[33]               $ 156,400,000          
Amortized Cost [33]               (149,900,000)          
Fair Value [4],[33]               $ (158,700,000)          
Investment, Identifier [Axis]: Performance Health Holdings Inc                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[19],[33],[45]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Base Rate Floor [19],[33],[45]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[19],[33],[45]               $ 120,700,000          
Amortized Cost [19],[33],[45]               (119,500,000)          
Fair Value [4],[19],[33],[45]               $ (120,200,000)          
Investment, Identifier [Axis]: Performance Health Holdings Inc, Senior Secured Loans - First Lien, Health Care Equipment & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[10],[21],[42] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Base Rate Floor [5],[8],[10],[21],[42] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[10],[13],[21],[42] $ 108,300,000                        
Amortized Cost [8],[10],[21],[42] (107,400,000)                        
Fair Value [3],[8],[10],[21],[42] $ (107,300,000)                        
Investment, Identifier [Axis]: Petrochoice Holdings Inc                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               8.75% 8.75% 8.75% 8.75% 8.75% 8.75%
Base Rate Floor [33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33]               $ 65,000,000.0          
Amortized Cost [33]               (64,400,000)          
Fair Value [4],[33]               $ (57,600,000)          
Investment, Identifier [Axis]: Petroplex Acidizing Inc                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[23],[26],[33],[43]               8.25% 8.25% 8.25% 8.25% 8.25% 8.25%
Interest rate, paid in kind [14],[23],[26],[33],[43]               1.80% 1.80% 1.80% 1.80% 1.80% 1.80%
Base Rate Floor [23],[26],[33],[43]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[23],[26],[33],[43]               $ 27,000,000.0          
Amortized Cost [23],[26],[33],[43]               (22,000,000.0)          
Fair Value [4],[23],[26],[33],[43]               $ (9,700,000)          
Investment, Identifier [Axis]: Petroplex Acidizing Inc | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[23],[26],[33],[43]               1.80% 1.80% 1.80% 1.80% 1.80% 1.80%
Investment, Identifier [Axis]: Petroplex Acidizing Inc, Preferred Stock A                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33],[43]               25,138,631 25,138,631 25,138,631 25,138,631 25,138,631 25,138,631
Amortized Cost [26],[33],[43]               $ (4,900,000)          
Fair Value [4],[26],[33],[43]               $ 0          
Investment, Identifier [Axis]: Petroplex Acidizing Inc, Trade Claim, Equity/Other, Energy                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[31] 646,309 646,309 646,309 646,309 646,309 646,309 646,309            
Amortized Cost [8],[31] $ (600,000)                        
Fair Value [3],[8],[31] $ (600,000)                        
Investment, Identifier [Axis]: Petroplex Acidizing Inc, Warrant                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33],[43]               8 8 8 8 8 8
Amortized Cost [26],[33],[43]               $ 0          
Fair Value [4],[26],[33],[43]               $ 0          
Investment, Identifier [Axis]: Plaskolite, LLC | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 4.00% 4.00% 4.00% 4.00% 4.00% 4.00% 4.00%            
Base Rate Floor 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount $ 1,100,000                        
Amortized Cost (1,100,000)                        
Fair Value $ (1,000,000.0)                        
Investment, Identifier [Axis]: Polyconcept North America Inc                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33],[38]               4.50% 4.50% 4.50% 4.50% 4.50% 4.50%
Interest rate, paid in kind [14],[33]               11.00% 11.00% 11.00% 11.00% 11.00% 11.00%
Base Rate Floor [33],[38]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33],[38]               $ 22,800,000          
Amortized Cost [33],[38]               (22,600,000)          
Fair Value [4],[33],[38]               $ (22,700,000)          
Investment, Identifier [Axis]: Polyconcept North America Inc | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33],[38]               4.50% 4.50% 4.50% 4.50% 4.50% 4.50%
Interest rate, paid in kind [14],[33]               11.00% 11.00% 11.00% 11.00% 11.00% 11.00%
Investment, Identifier [Axis]: Polyconcept North America Inc 2/16/24                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Principal amount [16],[33]               $ 10,000,000.0          
Amortized Cost [33]               (9,900,000)          
Fair Value [4],[33]               $ (10,000,000.0)          
Investment, Identifier [Axis]: Polyconcept North America Inc, Class A - 1 Units                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33]               30,000 30,000 30,000 30,000 30,000 30,000
Amortized Cost [26],[33]               $ (3,000,000.0)          
Fair Value [4],[26],[33]               $ (4,300,000)          
Investment, Identifier [Axis]: Polyconcept North America Inc, Class A - 1 Units, Equity/Other, Household & Personal Products                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8] 30,000 30,000 30,000 30,000 30,000 30,000 30,000            
Amortized Cost [8] $ (3,000,000.0)                        
Fair Value [3],[8] $ (9,000,000.0)                        
Investment, Identifier [Axis]: Precision Global Corp | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 4.75% 4.75% 4.75% 4.75% 4.75% 4.75% 4.75% 4.75% 4.75% 4.75% 4.75% 4.75% 4.75%
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount $ 8,900,000             $ 9,000,000.0          
Amortized Cost (8,700,000)             (8,700,000)          
Fair Value $ (8,800,000)             $ (8,700,000)          
Investment, Identifier [Axis]: Premium Credit Ltd | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%
Base Rate Floor 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount | £         £ 49.4             £ 49.4  
Amortized Cost $ (64,100,000)             $ (63,900,000)          
Fair Value $ (55,000,000.0)             $ (67,000,000.0)          
Investment, Identifier [Axis]: Premium Credit Ltd 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[27],[33]               6.50% 6.50% 6.50% 6.50% 6.50% 6.50%
Base Rate Floor [27],[33]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount | £ [16],[27],[33]                       £ 55.9  
Amortized Cost [27],[33]               $ (72,600,000)          
Fair Value [4],[27],[33]               $ (75,700,000)          
Investment, Identifier [Axis]: Premium Credit Ltd, Senior Secured Loans - First Lien, Diversified Financials                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9] 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%            
Base Rate Floor [5],[8],[9] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount | £ [8],[9],[13]         £ 55.9                
Amortized Cost [8],[9] $ (73,100,000)                        
Fair Value [3],[8],[9] $ (62,200,000)                        
Investment, Identifier [Axis]: Pretium Packaging LLC | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.75% 6.75% 6.75% 6.75% 6.75% 6.75% 6.75% 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%
Base Rate Floor 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%
Principal amount $ 39,900,000             $ 39,900,000          
Amortized Cost (39,700,000)             (39,700,000)          
Fair Value $ (36,200,000)             $ (39,500,000)          
Investment, Identifier [Axis]: Pretium Packaging LLC 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 4.00% 4.00% 4.00% 4.00% 4.00% 4.00% 4.00% 4.00% 4.00% 4.00% 4.00% 4.00% 4.00%
Base Rate Floor 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%
Principal amount $ 1,600,000             $ 1,600,000          
Amortized Cost (1,600,000)             (1,600,000)          
Fair Value $ (1,500,000)             $ (1,600,000)          
Investment, Identifier [Axis]: Pretium Partners LLC P1, Structured Mezzanine                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[27],[33]               5.30% 5.30% 5.30% 5.30% 5.30% 5.30%
Principal amount [16],[27],[33]               $ 6,700,000          
Amortized Cost [27],[33]               (6,200,000)          
Fair Value [4],[27],[33]               $ (6,800,000)          
Investment, Identifier [Axis]: Pretium Partners LLC P1, Structured Mezzanine | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 2.80% 2.80% 2.80% 2.80% 2.80% 2.80% 2.80%            
Interest rate, paid in kind 5.30% 5.30% 5.30% 5.30% 5.30% 5.30% 5.30%            
Principal amount $ 29,400,000                        
Amortized Cost (28,500,000)                        
Fair Value $ (29,200,000)                        
Investment, Identifier [Axis]: Pretium Partners LLC P1, Structured Mezzanine | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[27],[33]               5.30% 5.30% 5.30% 5.30% 5.30% 5.30%
Investment, Identifier [Axis]: Pretium Partners LLC P1, Structured Mezzanine | Maximum | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind 5.30% 5.30% 5.30% 5.30% 5.30% 5.30% 5.30%            
Investment, Identifier [Axis]: Pretium Partners LLC P1, Structured Mezzanine 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               280.00% 280.00% 280.00% 280.00% 280.00% 280.00%
Interest rate, paid in kind               530.00% 530.00% 530.00% 530.00% 530.00% 530.00%
Investment, Identifier [Axis]: Pretium Partners LLC P1, Structured Mezzanine 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Principal amount               $ 18,900,000          
Amortized Cost               (18,600,000)          
Fair Value               $ (19,100,000)          
Investment, Identifier [Axis]: Pretium Partners LLC P1, Structured Mezzanine 1 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind               530.00% 530.00% 530.00% 530.00% 530.00% 530.00%
Investment, Identifier [Axis]: Pretium Partners LLC P2, Private Equity                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[27],[33]               16,772,368 16,772,368 16,772,368 16,772,368 16,772,368 16,772,368
Amortized Cost [26],[27],[33]               $ (16,400,000)          
Fair Value [4],[26],[27],[33]               (16,400,000)          
Investment, Identifier [Axis]: Pretium Partners LLC P2, Private Equity | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares 16,772,368 16,772,368 16,772,368 16,772,368 16,772,368 16,772,368 16,772,368            
Amortized Cost $ (16,200,000)                        
Fair Value $ (14,400,000)                        
Investment, Identifier [Axis]: Pretium Partners LLC P2, Term Loan                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Principal amount [8],[9],[16],[27],[33]               33,500,000          
Amortized Cost [27],[33]               (32,900,000)          
Fair Value [4],[27],[33]               $ (32,900,000)          
Investment, Identifier [Axis]: Pretium Partners LLC P2, Term Loan, Asset Based Finance, Real Estate                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9] 11.00% 11.00% 11.00% 11.00% 11.00% 11.00% 11.00%            
Principal amount [8],[9],[13] $ 33,500,000                        
Amortized Cost [8],[9] (32,900,000)                        
Fair Value [3],[8],[9] $ (32,900,000)                        
Investment, Identifier [Axis]: Prime ST LLC, Private Equity                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[27],[32],[33]               5,983,135 5,983,135 5,983,135 5,983,135 5,983,135 5,983,135
Amortized Cost [26],[27],[32],[33]               $ (7,700,000)          
Fair Value [4],[26],[27],[32],[33]               $ (9,100,000)          
Investment, Identifier [Axis]: Prime ST LLC, Private Equity, Asset Based Finance, Real Estate                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[9],[31],[34] 5,983,135 5,983,135 5,983,135 5,983,135 5,983,135 5,983,135 5,983,135            
Amortized Cost [8],[9],[31],[34] $ (7,700,000)                        
Fair Value [3],[8],[9],[31],[34] $ 0                        
Investment, Identifier [Axis]: Prime ST LLC, Structured Mezzanine                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[27],[32],[33]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Principal amount [16],[27],[32],[33]               $ 52,400,000          
Amortized Cost [27],[32],[33]               (50,400,000)          
Fair Value [4],[27],[32],[33]               $ (52,400,000)          
Investment, Identifier [Axis]: Prime ST LLC, Structured Mezzanine | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[27],[32],[33]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Investment, Identifier [Axis]: Prime ST LLC, Structured Mezzanine, Asset Based Finance, Real Estate                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9],[34] 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%            
Interest rate, paid in kind [5],[8],[9],[34] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Principal amount [8],[9],[13],[34] $ 52,400,000                        
Amortized Cost [8],[9],[34] (50,500,000)                        
Fair Value [3],[8],[9],[34] $ (47,700,000)                        
Investment, Identifier [Axis]: Prime ST LLC, Structured Mezzanine, Asset Based Finance, Real Estate | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[9],[34] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Investment, Identifier [Axis]: Production Resource Group LLC, Senior Secured Loans - First Lien, Media & Entertainment 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[34] 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%            
Interest rate, paid in kind [5],[8],[34] 3.10% 3.10% 3.10% 3.10% 3.10% 3.10% 3.10%            
Base Rate Floor [5],[8],[34] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13],[34] $ 62,300,000                        
Amortized Cost [8],[34] (59,200,000)                        
Fair Value [3],[8],[34] $ (64,200,000)                        
Investment, Identifier [Axis]: Production Resource Group LLC, Senior Secured Loans - First Lien, Media & Entertainment 1 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[34] 3.10% 3.10% 3.10% 3.10% 3.10% 3.10% 3.10%            
Investment, Identifier [Axis]: Production Resource Group LLC, Senior Secured Loans - First Lien, Media & Entertainment 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[34] 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00%            
Interest rate, paid in kind [5],[8],[34] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[8],[34] 0.30% 0.30% 0.30% 0.30% 0.30% 0.30% 0.30%            
Principal amount [8],[13],[34] $ 146,400,000                        
Amortized Cost [8],[34] (140,000,000.0)                        
Fair Value [3],[8],[34] $ (149,400,000)                        
Investment, Identifier [Axis]: Production Resource Group LLC, Senior Secured Loans - First Lien, Media & Entertainment 2 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[34] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Investment, Identifier [Axis]: Production Resource Group LLC, Senior Secured Loans - First Lien, Media & Entertainment 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[34] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[8],[34] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13],[34] $ 100,000                        
Amortized Cost [8],[34] (100,000)                        
Fair Value [3],[8],[34] $ (100,000)                        
Investment, Identifier [Axis]: Production Resource Group LLC, Senior Secured Loans - First Lien, Media & Entertainment 3 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[34] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Investment, Identifier [Axis]: Production Resource Group LLC, Senior Secured Loans - First Lien, Media & Entertainment 4                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[34] 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%            
Interest rate, paid in kind [5],[8],[34] 3.10% 3.10% 3.10% 3.10% 3.10% 3.10% 3.10%            
Base Rate Floor [5],[8],[34] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13],[34] $ 34,300,000                        
Amortized Cost [8],[34] (34,100,000)                        
Fair Value [3],[8],[34] $ (34,600,000)                        
Investment, Identifier [Axis]: Production Resource Group LLC, Senior Secured Loans - First Lien, Media & Entertainment 4 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[34] 3.10% 3.10% 3.10% 3.10% 3.10% 3.10% 3.10%            
Investment, Identifier [Axis]: Production Resource Group LLC, Senior Secured Loans—First Lien, Media & Entertainment -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[32],[33]               5.00% 5.00% 5.00% 5.00% 5.00% 5.00%
Interest rate, paid in kind [14],[32],[33]               3.10% 3.10% 3.10% 3.10% 3.10% 3.10%
Base Rate Floor [32],[33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[32],[33]               $ 64,400,000          
Amortized Cost [32],[33]               (60,200,000)          
Fair Value [4],[32],[33]               $ (64,400,000)          
Investment, Identifier [Axis]: Production Resource Group LLC, Senior Secured Loans—First Lien, Media & Entertainment -1 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[32],[33]               3.10% 3.10% 3.10% 3.10% 3.10% 3.10%
Investment, Identifier [Axis]: Production Resource Group LLC, Senior Secured Loans—First Lien, Media & Entertainment -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[32],[33]               3.00% 3.00% 3.00% 3.00% 3.00% 3.00%
Interest rate, paid in kind [14],[32],[33]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Base Rate Floor [32],[33]               0.30% 0.30% 0.30% 0.30% 0.30% 0.30%
Principal amount [16],[32],[33]               $ 133,300,000          
Amortized Cost [32],[33]               (124,900,000)          
Fair Value [4],[32],[33]               $ (133,300,000)          
Investment, Identifier [Axis]: Production Resource Group LLC, Senior Secured Loans—First Lien, Media & Entertainment -2 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[32],[33]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Investment, Identifier [Axis]: Production Resource Group LLC, Senior Secured Loans—First Lien, Media & Entertainment -3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[32],[33]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Base Rate Floor [32],[33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[32],[33]               $ 100,000          
Amortized Cost [32],[33]               (100,000)          
Fair Value [4],[32],[33]               $ (100,000)          
Investment, Identifier [Axis]: Production Resource Group LLC, Senior Secured Loans—First Lien, Media & Entertainment -3 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[32],[33]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Investment, Identifier [Axis]: Production Resource Group LLC, Senior Secured Loans—First Lien, Media & Entertainment -4                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[32],[33]               7.50% 7.50% 7.50% 7.50% 7.50% 7.50%
Interest rate, paid in kind [14],[32],[33]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Base Rate Floor [32],[33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[32],[33]               $ 20,200,000          
Amortized Cost [32],[33]               (20,100,000)          
Fair Value [4],[32],[33]               $ (20,200,000)          
Investment, Identifier [Axis]: Production Resource Group LLC, Senior Secured Loans—First Lien, Media & Entertainment -4 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[32],[33]               3.10% 3.10% 3.10% 3.10% 3.10% 3.10%
Investment, Identifier [Axis]: Production Resource Group LLC, Senior Secured Loans—First Lien, Media & Entertainment -5                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15],[32]               7.50% 7.50% 7.50% 7.50% 7.50% 7.50%
Interest rate, paid in kind [14],[15],[32]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Base Rate Floor [15],[32]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16],[32]               $ 10,100,000          
Amortized Cost [15],[32]               (10,100,000)          
Fair Value [4],[15],[32]               $ (10,100,000)          
Investment, Identifier [Axis]: Production Resource Group LLC, Senior Secured Loans—First Lien, Media & Entertainment -5 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[15],[32]               3.10% 3.10% 3.10% 3.10% 3.10% 3.10%
Investment, Identifier [Axis]: Project Marron 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%            
Principal amount           $ 81.8              
Amortized Cost $ (56,300,000)                        
Fair Value $ (50,400,000)                        
Investment, Identifier [Axis]: Project Marron 2 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%            
Principal amount             $ 52.5            
Amortized Cost $ (40,000,000.0)                        
Fair Value $ (36,400,000)                        
Investment, Identifier [Axis]: Project Marron B+575 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount                         $ 3.2
Amortized Cost               $ (2,300,000)          
Fair Value               $ (2,200,000)          
Investment, Identifier [Axis]: Project Marron B+625 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount                         $ 63.6
Amortized Cost               $ (43,900,000)          
Fair Value               $ (43,600,000)          
Investment, Identifier [Axis]: Project Marron C+625 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount               $ 52,500,000          
Amortized Cost               (39,900,000)          
Fair Value               $ (39,100,000)          
Investment, Identifier [Axis]: Propulsion Acquisition LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[18],[33],[35],[40],[45]               7.00% 7.00% 7.00% 7.00% 7.00% 7.00%
Base Rate Floor [18],[33],[35],[40],[45]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[18],[33],[35],[40],[45]               $ 60,500,000          
Amortized Cost [18],[33],[35],[40],[45]               (56,800,000)          
Fair Value [4],[18],[33],[35],[40],[45]               $ (61,100,000)          
Investment, Identifier [Axis]: Propulsion Acquisition LLC, Senior Secured Loans - First Lien, Capital Goods                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[12],[21],[22],[37] 7.00% 7.00% 7.00% 7.00% 7.00% 7.00% 7.00%            
Base Rate Floor [5],[8],[12],[21],[22],[37] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[12],[13],[21],[22],[37] $ 60,000,000.0                        
Amortized Cost [8],[12],[21],[22],[37] (57,300,000)                        
Fair Value [3],[8],[12],[21],[22],[37] $ (60,000,000.0)                        
Investment, Identifier [Axis]: Proserv Acquisition LLC, Class A Common Units                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[27],[33],[43]               2,635,005 2,635,005 2,635,005 2,635,005 2,635,005 2,635,005
Amortized Cost [26],[27],[33],[43]               $ (33,400,000)          
Fair Value [4],[26],[27],[33],[43]               $ (100,000)          
Investment, Identifier [Axis]: Proserv Acquisition LLC, Class A Common Units, Equity/Other, Energy                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[9],[31],[44] 2,635,005 2,635,005 2,635,005 2,635,005 2,635,005 2,635,005 2,635,005            
Amortized Cost [8],[9],[31],[44] $ (33,500,000)                        
Fair Value [3],[8],[9],[31],[44] $ (500,000)                        
Investment, Identifier [Axis]: Proserv Acquisition LLC, Class A Preferred Units                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[27],[33],[43]               837,780 837,780 837,780 837,780 837,780 837,780
Amortized Cost [26],[27],[33],[43]               $ (5,400,000)          
Fair Value [4],[26],[27],[33],[43]               $ (9,300,000)          
Investment, Identifier [Axis]: Proserv Acquisition LLC, Class A Preferred Units, Equity/Other, Energy                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[9],[31],[44] 837,780 837,780 837,780 837,780 837,780 837,780 837,780            
Amortized Cost [8],[9],[31],[44] $ (5,400,000)                        
Fair Value [3],[8],[9],[31],[44] $ (9,000,000.0)                        
Investment, Identifier [Axis]: Pure Fishing Inc | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 4.50% 4.50% 4.50% 4.50% 4.50% 4.50% 4.50%            
Base Rate Floor 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount $ 9,800,000                        
Amortized Cost (9,700,000)                        
Fair Value $ (8,200,000)                        
Investment, Identifier [Axis]: Pure Fishing Inc | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               4.50% 4.50% 4.50% 4.50% 4.50% 4.50%
Base Rate Floor               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount               $ 9,900,000          
Amortized Cost               (9,800,000)          
Fair Value               $ (9,600,000)          
Investment, Identifier [Axis]: Pure Fishing Inc 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33],[41],[45]               8.38% 8.38% 8.38% 8.38% 8.38% 8.38%
Base Rate Floor [33],[41],[45]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33],[41],[45]               $ 177,000,000.0          
Amortized Cost [33],[41],[45]               (170,600,000)          
Fair Value [4],[33],[41],[45]               $ (168,100,000)          
Investment, Identifier [Axis]: Pure Fishing Inc 2 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 8.38% 8.38% 8.38% 8.38% 8.38% 8.38% 8.38% 8.38% 8.38% 8.38% 8.38% 8.38% 8.38%
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount $ 26,500,000             $ 46,800,000          
Amortized Cost (24,100,000)             (42,000,000.0)          
Fair Value $ (22,900,000)             $ (44,500,000)          
Investment, Identifier [Axis]: Pure Fishing Inc, Senior Secured Loans - First Lien, Consumer Durables & Apparel                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[39] 4.50% 4.50% 4.50% 4.50% 4.50% 4.50% 4.50%            
Base Rate Floor [5],[8],[39] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount [8],[13],[39] $ 33,800,000                        
Amortized Cost [8],[39] (33,200,000)                        
Fair Value [3],[8],[39] $ (28,000,000.0)                        
Investment, Identifier [Axis]: Pure Fishing Inc, Senior Secured Loans -Second Lien, Consumer Durables & Apparel                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[42] 8.38% 8.38% 8.38% 8.38% 8.38% 8.38% 8.38%            
Base Rate Floor [5],[8],[42] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13],[42] $ 100,000,000.0                        
Amortized Cost [8],[42] (95,100,000)                        
Fair Value [3],[8],[42] $ (86,700,000)                        
Investment, Identifier [Axis]: Pure Gym Ltd, Private Equity | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares 30,218,000 30,218,000 30,218,000 30,218,000 30,218,000 30,218,000 30,218,000            
Amortized Cost $ (39,400,000)                        
Fair Value $ (35,200,000)                        
Investment, Identifier [Axis]: Qdoba Restaurant Corp                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33],[38],[41]               7.00% 7.00% 7.00% 7.00% 7.00% 7.00%
Base Rate Floor [33],[38],[41]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33],[38],[41]               $ 10,900,000          
Amortized Cost [33],[38],[41]               (10,800,000)          
Fair Value [4],[33],[38],[41]               $ (10,800,000)          
Investment, Identifier [Axis]: Qdoba Restaurant Corp | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 7.00% 7.00% 7.00% 7.00% 7.00% 7.00% 7.00%            
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount $ 3,500,000                        
Amortized Cost (3,300,000)                        
Fair Value $ (3,400,000)                        
Investment, Identifier [Axis]: Qdoba Restaurant Corp 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               7.00% 7.00% 7.00% 7.00% 7.00% 7.00%
Base Rate Floor               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount               $ 3,500,000          
Amortized Cost               (3,300,000)          
Fair Value               $ (3,400,000)          
Investment, Identifier [Axis]: Qdoba Restaurant Corp, Senior Secured Loans - First Lien, Consumer Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[39],[42] 7.00% 7.00% 7.00% 7.00% 7.00% 7.00% 7.00%            
Base Rate Floor [5],[8],[39],[42] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13],[39],[42] $ 10,900,000                        
Amortized Cost [8],[39],[42] (10,800,000)                        
Fair Value [3],[8],[39],[42] $ (10,800,000)                        
Investment, Identifier [Axis]: Quorum Health Corp, Trade Claim                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33]               8,301,000 8,301,000 8,301,000 8,301,000 8,301,000 8,301,000
Amortized Cost [26],[33]               $ (700,000)          
Fair Value [4],[26],[33]               $ (900,000)          
Investment, Identifier [Axis]: Quorum Health Corp, Trade Claim, Equity/Other, Health Care Equipment & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[31] 8,301,000 8,301,000 8,301,000 8,301,000 8,301,000 8,301,000 8,301,000            
Amortized Cost [8],[31] $ (700,000)                        
Fair Value [3],[8],[31] $ (900,000)                        
Investment, Identifier [Axis]: Quorum Health Corp, Trust Initial Funding Units                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33]               143,400 143,400 143,400 143,400 143,400 143,400
Amortized Cost [26],[33]               $ (200,000)          
Fair Value [4],[26],[33]               $ (200,000)          
Investment, Identifier [Axis]: Quorum Health Corp, Trust Initial Funding Units, Equity/Other, Health Care Equipment & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[31] 143,400 143,400 143,400 143,400 143,400 143,400 143,400            
Amortized Cost [8],[31] $ (200,000)                        
Fair Value [3],[8],[31] $ (200,000)                        
Investment, Identifier [Axis]: RSC Insurance Brokerage Inc | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Base Rate Floor 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount $ 18,900,000             $ 19,000,000.0          
Amortized Cost (18,800,000)             (19,000,000.0)          
Fair Value $ (18,700,000)             $ (19,200,000)          
Investment, Identifier [Axis]: RSC Insurance Brokerage Inc, Senior Secured Loans—First Lien, Insurance -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[17],[18],[19],[33],[35],[41],[45]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Base Rate Floor [17],[18],[19],[33],[35],[41],[45]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [16],[17],[18],[19],[33],[35],[41],[45]               $ 277,800,000          
Amortized Cost [17],[18],[19],[33],[35],[41],[45]               (268,100,000)          
Fair Value [4],[17],[18],[19],[33],[35],[41],[45]               $ (280,600,000)          
Investment, Identifier [Axis]: RSC Insurance Brokerage Inc, Senior Secured Loans—First Lien, Insurance -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Base Rate Floor [33]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [16],[33]               $ 4,100,000          
Amortized Cost [33]               (4,000,000.0)          
Fair Value [4],[33]               $ (4,100,000)          
Investment, Identifier [Axis]: RSC Insurance Brokerage Inc, Senior Secured Loans—First Lien, Insurance -3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Base Rate Floor [15]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [15],[16]               $ 16,100,000          
Amortized Cost [15]               (16,100,000)          
Fair Value [4],[15]               $ (16,300,000)          
Investment, Identifier [Axis]: RSC Insurance Brokerage Inc, Senior Secured Loans—First Lien, Insurance -4                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Base Rate Floor [15]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [15],[16]               $ 3,600,000          
Amortized Cost [15]               (3,600,000)          
Fair Value [4],[15]               $ (3,600,000)          
Investment, Identifier [Axis]: RSC Insurance Brokerage Inc, Senior Secured Loans - First Lien, Insurance 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[10],[11],[12],[37],[42] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[8],[10],[11],[12],[37],[42] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[10],[11],[12],[13],[37],[42] $ 240,600,000                        
Amortized Cost [8],[10],[11],[12],[37],[42] (234,700,000)                        
Fair Value [3],[8],[10],[11],[12],[37],[42] $ (239,000,000.0)                        
Investment, Identifier [Axis]: RSC Insurance Brokerage Inc, Senior Secured Loans - First Lien, Insurance 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [13],[20] $ 7,700,000                        
Amortized Cost [20] (7,600,000)                        
Fair Value [3],[20] $ (7,700,000)                        
Investment, Identifier [Axis]: Radwell International LLC/PA, Senior Secured Loans - First Lien, Capital Goods                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[8] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[13] $ 1,000,000.0                        
Amortized Cost [8] (1,000,000.0)                        
Fair Value [3],[8] $ (1,000,000.0)                        
Investment, Identifier [Axis]: Reliant Rehab Hospital Cincinnati LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[18],[19],[33],[35],[41],[45]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor [18],[19],[33],[35],[41],[45]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount [16],[18],[19],[33],[35],[41],[45]               $ 126,800,000          
Amortized Cost [18],[19],[33],[35],[41],[45]               (120,700,000)          
Fair Value [4],[18],[19],[33],[35],[41],[45]               $ (124,100,000)          
Investment, Identifier [Axis]: Reliant Rehab Hospital Cincinnati LLC | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount $ 33,800,000                        
Amortized Cost (32,800,000)                        
Fair Value $ (28,400,000)                        
Investment, Identifier [Axis]: Reliant Rehab Hospital Cincinnati LLC 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount               $ 15,600,000          
Amortized Cost               (15,200,000)          
Fair Value               $ (15,300,000)          
Investment, Identifier [Axis]: Reliant Rehab Hospital Cincinnati LLC, Senior Secured Loans - First Lien, Health Care Equipment & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[10],[12],[21],[37],[42] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor [5],[8],[10],[12],[21],[37],[42] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount [8],[10],[12],[13],[21],[37],[42] $ 106,800,000                        
Amortized Cost [8],[10],[12],[21],[37],[42] (101,400,000)                        
Fair Value [3],[8],[10],[12],[21],[37],[42] $ (89,900,000)                        
Investment, Identifier [Axis]: Revere Superior Holdings Inc | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount $ 19,600,000             $ 19,800,000          
Amortized Cost (19,600,000)             (19,800,000)          
Fair Value $ (19,600,000)             $ (19,900,000)          
Investment, Identifier [Axis]: Revere Superior Holdings Inc, Senior Secured Loans—First Lien, Software & Services - 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33],[41]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor [33],[41]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33],[41]               $ 23,000,000.0          
Amortized Cost [33],[41]               (22,400,000)          
Fair Value [4],[33],[41]               $ (23,300,000)          
Investment, Identifier [Axis]: Revere Superior Holdings Inc, Senior Secured Loans—First Lien, Software & Services - 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 3,200,000          
Amortized Cost [15]               (3,200,000)          
Fair Value [4],[15]               $ (3,200,000)          
Investment, Identifier [Axis]: Revere Superior Holdings Inc, Senior Secured Loans—First Lien, Software & Services - 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor [33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33]               $ 3,300,000          
Amortized Cost [33]               (3,300,000)          
Fair Value [4],[33]               $ (3,400,000)          
Investment, Identifier [Axis]: Revere Superior Holdings Inc, Senior Secured Loans—First Lien, Software & Services - 4                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 7,400,000          
Amortized Cost [15]               (7,400,000)          
Fair Value [4],[15]               $ (7,500,000)          
Investment, Identifier [Axis]: Revere Superior Holdings Inc, Senior Secured Loans - First Lien, Software & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[20] $ 1,700,000                        
Amortized Cost [20] (1,700,000)                        
Fair Value [3],[20] $ (1,700,000)                        
Investment, Identifier [Axis]: Revere Superior Holdings Inc, Senior Secured Loans - First Lien, Software & Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[42] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[8],[42] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13],[42] $ 33,600,000                        
Amortized Cost [8],[42] (32,900,000)                        
Fair Value [3],[8],[42] $ (33,600,000)                        
Investment, Identifier [Axis]: Revere Superior Holdings Inc, Senior Secured Loans - First Lien, Software & Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13] $ 1,500,000                        
Amortized Cost [8] (1,500,000)                        
Fair Value [3],[8] $ (1,500,000)                        
Investment, Identifier [Axis]: Ridgeback Resources Inc, Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[27],[33],[54],[55]               1,969,418 1,969,418 1,969,418 1,969,418 1,969,418 1,969,418
Amortized Cost [26],[27],[33],[54],[55]               $ (9,100,000)          
Fair Value [4],[26],[27],[33],[54],[55]               $ (9,900,000)          
Investment, Identifier [Axis]: Ridgeback Resources Inc, Common Stock, Equity/Other, Energy                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [6],[7],[8],[9] 1,969,418 1,969,418 1,969,418 1,969,418 1,969,418 1,969,418 1,969,418            
Amortized Cost [6],[7],[8],[9] $ (8,000,000.0)                        
Fair Value [3],[6],[7],[8],[9] $ (8,300,000)                        
Investment, Identifier [Axis]: Rise Baking Company 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount $ 1,400,000             $ 1,000,000.0          
Amortized Cost (1,300,000)             (1,000,000.0)          
Fair Value $ (1,300,000)             $ (1,000,000.0)          
Investment, Identifier [Axis]: Rise Baking Company 2 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount $ 30,500,000             $ 30,700,000          
Amortized Cost (29,900,000)             (30,000,000.0)          
Fair Value $ (28,400,000)             $ (30,100,000)          
Investment, Identifier [Axis]: Rise Baking Company 3 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount $ 600,000             $ 900,000          
Amortized Cost (600,000)             (900,000)          
Fair Value $ (500,000)             $ (900,000)          
Investment, Identifier [Axis]: Rise Baking Company, Senior Secured Loans—First Lien, Food, Beverage & Tobacco -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor [33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33]               $ 2,800,000          
Amortized Cost [33]               (2,600,000)          
Fair Value [4],[33]               $ (2,700,000)          
Investment, Identifier [Axis]: Rise Baking Company, Senior Secured Loans—First Lien, Food, Beverage & Tobacco -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[18],[41]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor [18],[41]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[18],[41]               $ 28,800,000          
Amortized Cost [18],[41]               (28,100,000)          
Fair Value [4],[18],[41]               $ (28,200,000)          
Investment, Identifier [Axis]: Rise Baking Company, Senior Secured Loans—First Lien, Food, Beverage & Tobacco -3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 2,500,000          
Amortized Cost [15]               (2,500,000)          
Fair Value [4],[15]               $ (2,500,000)          
Investment, Identifier [Axis]: Rise Baking Company, Senior Secured Loans - First Lien, Food, Beverage & Tobacco 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13] $ 3,700,000                        
Amortized Cost [8] (3,600,000)                        
Fair Value [3],[8] $ (3,400,000)                        
Investment, Identifier [Axis]: Rise Baking Company, Senior Secured Loans - First Lien, Food, Beverage & Tobacco 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[12],[42] 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%            
Base Rate Floor [5],[12],[42] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [12],[13],[42] $ 28,600,000                        
Amortized Cost [12],[42] (28,000,000.0)                        
Fair Value [3],[12],[42] $ (26,700,000)                        
Investment, Identifier [Axis]: Rise Baking Company, Senior Secured Loans - First Lien, Food, Beverage & Tobacco 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[20] $ 1,600,000                        
Amortized Cost [20] (1,600,000)                        
Fair Value [3],[20] $ (1,500,000)                        
Investment, Identifier [Axis]: Roemanu LLC (FKA Toorak Capital Partners LLC), Private Equity | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares 40,000,000 40,000,000 40,000,000 40,000,000 40,000,000 40,000,000 40,000,000            
Amortized Cost $ (50,200,000)                        
Fair Value $ (47,100,000)                        
Investment, Identifier [Axis]: Roemanu LLC (FKA Toorak Capital Partners LLC), Private Equity, Asset Based Finance, Real Estate                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[34] 220,778,388 220,778,388 220,778,388 220,778,388 220,778,388 220,778,388 220,778,388            
Amortized Cost [8],[34] $ (236,500,000)                        
Fair Value [3],[8],[34] $ (259,700,000)                        
Investment, Identifier [Axis]: SAMBA Safety Inc | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount $ 27,200,000             $ 27,400,000          
Amortized Cost (26,900,000)             (27,100,000)          
Fair Value $ (26,900,000)             $ (27,200,000)          
Investment, Identifier [Axis]: SAMBA Safety Inc, Senior Secured Loans—First Lien, Software & Services -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 2,400,000          
Amortized Cost [15]               (2,400,000)          
Fair Value [4],[15]               $ (2,400,000)          
Investment, Identifier [Axis]: SAMBA Safety Inc, Senior Secured Loans—First Lien, Software & Services -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 6,100,000          
Amortized Cost [15]               (6,100,000)          
Fair Value [4],[15]               $ (6,000,000.0)          
Investment, Identifier [Axis]: SAMBA Safety Inc, Senior Secured Loans - First Lien, Software & Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13] $ 6,100,000                        
Amortized Cost [8] (6,000,000.0)                        
Fair Value [3],[8] $ (6,000,000.0)                        
Investment, Identifier [Axis]: SAMBA Safety Inc, Senior Secured Loans - First Lien, Software & Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13] $ 600,000                        
Amortized Cost [8] (600,000)                        
Fair Value [3],[8] $ (600,000)                        
Investment, Identifier [Axis]: SAMBA Safety Inc, Senior Secured Loans - First Lien, Software & Services 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[20] $ 1,800,000                        
Amortized Cost [20] (1,800,000)                        
Fair Value [3],[20] $ (1,800,000)                        
Investment, Identifier [Axis]: SG Residential Mortgage Trust 2022-2, Structured Mezzanine | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Base Rate Floor 5.40% 5.40% 5.40% 5.40% 5.40% 5.40% 5.40%            
Principal amount $ 4,600,000                        
Amortized Cost (3,800,000)                        
Fair Value $ (3,700,000)                        
Investment, Identifier [Axis]: SI Group Inc | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 4.75% 4.75% 4.75% 4.75% 4.75% 4.75% 4.75%            
Base Rate Floor 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount $ 1,500,000                        
Amortized Cost (1,500,000)                        
Fair Value $ (1,300,000)                        
Investment, Identifier [Axis]: SIRVA Worldwide Inc                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33],[38]               9.50% 9.50% 9.50% 9.50% 9.50% 9.50%
Base Rate Floor [33],[38]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount [16],[33],[38]               $ 6,500,000          
Amortized Cost [33],[38]               (5,400,000)          
Fair Value [4],[33],[38]               $ (5,700,000)          
Investment, Identifier [Axis]: SIRVA Worldwide Inc | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 9.50% 9.50% 9.50% 9.50% 9.50% 9.50% 9.50%            
Base Rate Floor 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount $ 10,300,000                        
Amortized Cost (8,700,000)                        
Fair Value $ (9,000,000.0)                        
Investment, Identifier [Axis]: SIRVA Worldwide Inc 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Base Rate Floor 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount $ 6,900,000             $ 7,100,000          
Amortized Cost (6,600,000)             (6,700,000)          
Fair Value $ (6,300,000)             $ (6,400,000)          
Investment, Identifier [Axis]: SIRVA Worldwide Inc 2 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               9.50% 9.50% 9.50% 9.50% 9.50% 9.50%
Base Rate Floor               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount               $ 3,800,000          
Amortized Cost               (3,100,000)          
Fair Value               $ (3,300,000)          
Investment, Identifier [Axis]: Sabre Inc | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 2.00% 2.00% 2.00% 2.00% 2.00% 2.00% 2.00%            
Base Rate Floor 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount $ 2,100,000                        
Amortized Cost (2,100,000)                        
Fair Value $ (2,100,000)                        
Investment, Identifier [Axis]: Safe-Guard Products International LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[40],[41],[45]               5.00% 5.00% 5.00% 5.00% 5.00% 5.00%
Base Rate Floor [40],[41],[45]               0.50% 0.50% 0.50% 0.50% 0.50% 0.50%
Principal amount [16],[40],[41],[45]               $ 45,100,000          
Amortized Cost [40],[41],[45]               (42,500,000)          
Fair Value [4],[40],[41],[45]               $ (45,100,000)          
Investment, Identifier [Axis]: Safe-Guard Products International LLC | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%            
Base Rate Floor 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%            
Principal amount $ 71,700,000                        
Amortized Cost (72,100,000)                        
Fair Value $ (71,700,000)                        
Investment, Identifier [Axis]: Safe-Guard Products International LLC 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               5.00% 5.00% 5.00% 5.00% 5.00% 5.00%
Base Rate Floor               0.50% 0.50% 0.50% 0.50% 0.50% 0.50%
Principal amount               $ 75,500,000          
Amortized Cost               (76,000,000.0)          
Fair Value               $ (75,500,000)          
Investment, Identifier [Axis]: Safe-Guard Products International LLC, Senior Secured Loans - First Lien, Diversified Financials                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[21] 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%            
Base Rate Floor [5],[21] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%            
Principal amount [13],[21] $ 100,000                        
Amortized Cost [21] (100,000)                        
Fair Value [3],[21] $ (100,000)                        
Investment, Identifier [Axis]: Saluda Grade Alternative Mortgage Trust 2022-BC2, Structured Mezzanine, Asset Based Finance, Real Estate 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9] 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%            
Number of Shares | shares [8],[9] 5,700,000 5,700,000 5,700,000 5,700,000 5,700,000 5,700,000 5,700,000            
Amortized Cost [8],[9] $ (5,700,000)                        
Fair Value [3],[8],[9] $ (5,700,000)                        
Investment, Identifier [Axis]: Saluda Grade Alternative Mortgage Trust 2022-BC2, Structured Mezzanine, Asset Based Finance, Real Estate 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9] 18.00% 18.00% 18.00% 18.00% 18.00% 18.00% 18.00%            
Number of Shares | shares [8],[9],[13] 3,400,000 3,400,000 3,400,000 3,400,000 3,400,000 3,400,000 3,400,000            
Amortized Cost [8],[9] $ (2,300,000)                        
Fair Value [3],[8],[9] $ (2,400,000)                        
Investment, Identifier [Axis]: Saluda Grade Alternative Mortgage Trust 2022-BC2, Term Loan, Asset Based Finance, Real Estate                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9] 7.30% 7.30% 7.30% 7.30% 7.30% 7.30% 7.30%            
Principal amount [8],[9],[13] $ 34,500,000                        
Amortized Cost [8],[9] (34,500,000)                        
Fair Value [3],[8],[9] $ (34,400,000)                        
Investment, Identifier [Axis]: SavATree LLC | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Base Rate Floor 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount $ 39,700,000             $ 40,000,000.0          
Amortized Cost (39,400,000)             (39,700,000)          
Fair Value $ (39,200,000)             $ (39,700,000)          
Investment, Identifier [Axis]: SavATree LLC, Senior Secured Loans—First Lien, Consumer Services -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Base Rate Floor [33]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [16],[33]               $ 1,900,000          
Amortized Cost [33]               (1,800,000)          
Fair Value [4],[33]               $ (1,900,000)          
Investment, Identifier [Axis]: SavATree LLC, Senior Secured Loans—First Lien, Consumer Services -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Base Rate Floor [15]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [15],[16]               $ 7,600,000          
Amortized Cost [15]               (7,600,000)          
Fair Value [4],[15]               $ (7,600,000)          
Investment, Identifier [Axis]: SavATree LLC, Senior Secured Loans—First Lien, Consumer Services -3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Base Rate Floor [15]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [15],[16]               $ 6,300,000          
Amortized Cost [15]               (6,300,000)          
Fair Value [4],[15]               $ (6,300,000)          
Investment, Identifier [Axis]: SavATree LLC, Senior Secured Loans - First Lien, Consumer Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[8] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[13] $ 3,200,000                        
Amortized Cost [8] (3,100,000)                        
Fair Value [3],[8] $ (3,100,000)                        
Investment, Identifier [Axis]: SavATree LLC, Senior Secured Loans - First Lien, Consumer Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [13],[20] $ 6,300,000                        
Amortized Cost [20] (6,300,000)                        
Fair Value [3],[20] $ (6,300,000)                        
Investment, Identifier [Axis]: SavATree LLC, Senior Secured Loans - First Lien, Consumer Services 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [13],[20] $ 6,300,000                        
Amortized Cost [20] (6,300,000)                        
Fair Value [3],[20] $ (6,300,000)                        
Investment, Identifier [Axis]: Sealane Trade Finance | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares 1,254,327 1,254,327 1,254,327 1,254,327 1,254,327 1,254,327 1,254,327            
Amortized Cost $ (1,300,000)                        
Fair Value $ (500,000)                        
Investment, Identifier [Axis]: Sealane Trade Finance L+375                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               3.75% 3.75% 3.75% 3.75% 3.75% 3.75%
Investment, Identifier [Axis]: Sealane Trade Finance L+375 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Base Rate Floor               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount               $ 5,000,000.0          
Amortized Cost               (5,000,000.0)          
Fair Value               $ (5,000,000.0)          
Investment, Identifier [Axis]: Sealane Trade Finance L+963                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               9.63% 9.63% 9.63% 9.63% 9.63% 9.63%
Investment, Identifier [Axis]: Sealane Trade Finance L+963 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Base Rate Floor               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount               $ 11,200,000          
Amortized Cost               (11,200,000)          
Fair Value               $ (11,200,000)          
Investment, Identifier [Axis]: Sequa Corp                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33],[38],[41]               10.75% 10.75% 10.75% 10.75% 10.75% 10.75%
Interest rate, paid in kind [14],[33],[38],[41]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Base Rate Floor [33],[38],[41]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33],[38],[41]               $ 5,900,000          
Amortized Cost [33],[38],[41]               (5,700,000)          
Fair Value [4],[33],[38],[41]               $ (5,900,000)          
Investment, Identifier [Axis]: Sequa Corp | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.75% 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%            
Interest rate, paid in kind 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount $ 23,400,000                        
Amortized Cost (22,900,000)                        
Fair Value $ (23,400,000)                        
Investment, Identifier [Axis]: Sequa Corp | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[33],[38],[41]               6.80% 6.80% 6.80% 6.80% 6.80% 6.80%
Investment, Identifier [Axis]: Sequa Corp | Maximum | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Investment, Identifier [Axis]: Sequa Corp 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               10.75% 10.75% 10.75% 10.75% 10.75% 10.75%
Interest rate, paid in kind               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Base Rate Floor               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount               $ 39,100,000          
Amortized Cost               (33,900,000)          
Fair Value               $ (39,100,000)          
Investment, Identifier [Axis]: Sequa Corp 1 | Maximum | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind               680.00% 680.00% 680.00% 680.00% 680.00% 680.00%
Investment, Identifier [Axis]: Sequa Corp 2 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               6.75% 6.75% 6.75% 6.75% 6.75% 6.75%
Interest rate, paid in kind               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Base Rate Floor               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount               $ 45,400,000          
Amortized Cost               (43,900,000)          
Fair Value               $ (45,800,000)          
Investment, Identifier [Axis]: Sequa Corp 2 | Maximum | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind               100.00% 100.00% 100.00% 100.00% 100.00% 100.00%
Investment, Identifier [Axis]: Sequa Corp, Fair Value Hierarchy, Senior Secured Loans—First Lien, Capital Goods -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33],[38],[41]               6.75% 6.75% 6.75% 6.75% 6.75% 6.75%
Interest rate, paid in kind [14],[33],[38],[41]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Base Rate Floor [33],[38],[41]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33],[38],[41]               $ 16,000,000.0          
Amortized Cost [33],[38],[41]               (15,400,000)          
Fair Value [4],[33],[38],[41]               $ (16,200,000)          
Investment, Identifier [Axis]: Sequa Corp, Fair Value Hierarchy, Senior Secured Loans—First Lien, Capital Goods -1 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[33],[38],[41]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Investment, Identifier [Axis]: Sequa Corp, Fair Value Hierarchy, Senior Secured Loans—First Lien, Capital Goods -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               9.00% 9.00% 9.00% 9.00% 9.00% 9.00%
Interest rate, paid in kind [14],[33]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Base Rate Floor [33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33]               $ 16,400,000          
Amortized Cost [33]               (16,000,000.0)          
Fair Value [4],[33]               $ (17,200,000)          
Investment, Identifier [Axis]: Sequa Corp, Fair Value Hierarchy, Senior Secured Loans—First Lien, Capital Goods -2 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[33]               9.50% 9.50% 9.50% 9.50% 9.50% 9.50%
Investment, Identifier [Axis]: Sequa Corp, Senior Secured Loans - First Lien, Capital Goods                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[39],[42] 6.75% 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%            
Interest rate, paid in kind [5],[8],[39],[42] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Base Rate Floor [5],[8],[39],[42] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13],[39],[42] $ 8,300,000                        
Amortized Cost [8],[39],[42] (8,100,000)                        
Fair Value [3],[8],[39],[42] $ (8,300,000)                        
Investment, Identifier [Axis]: Sequa Corp, Senior Secured Loans - First Lien, Capital Goods | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[39],[42] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Investment, Identifier [Axis]: Sequel Youth & Family Services LLC, Senior Secured Loans—First Lien, Health Care Equipment & Services -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[23],[26],[33]               8.00% 8.00% 8.00% 8.00% 8.00% 8.00%
Base Rate Floor [23],[26],[33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[23],[26],[33]               $ 170,000,000.0          
Amortized Cost [23],[26],[33]               (106,400,000)          
Fair Value [4],[23],[26],[33]               $ (51,600,000)          
Investment, Identifier [Axis]: Sequel Youth & Family Services LLC, Senior Secured Loans—First Lien, Health Care Equipment & Services -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[23],[26],[33]               7.00% 7.00% 7.00% 7.00% 7.00% 7.00%
Base Rate Floor [23],[26],[33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[23],[26],[33]               $ 29,200,000          
Amortized Cost [23],[26],[33]               (19,300,000)          
Fair Value [4],[23],[26],[33]               $ (8,900,000)          
Investment, Identifier [Axis]: Sequel Youth & Family Services LLC, Senior Secured Loans—First Lien, Health Care Equipment & Services -3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               7.00% 7.00% 7.00% 7.00% 7.00% 7.00%
Base Rate Floor [33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33]               $ 36,000,000.0          
Amortized Cost [33]               (36,000,000.0)          
Fair Value [4],[33]               $ (36,000,000.0)          
Investment, Identifier [Axis]: Sequel Youth & Family Services LLC, Senior Secured Loans—First Lien, Health Care Equipment & Services -4                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               7.00% 7.00% 7.00% 7.00% 7.00% 7.00%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 6,000,000.0          
Amortized Cost [15]               (6,000,000.0)          
Fair Value [4],[15]               $ (6,000,000.0)          
Investment, Identifier [Axis]: Sequel Youth & Family Services LLC, Class R Common Stock, Equity/Other, Health Care Equipment & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [31],[53] 900,000 900,000 900,000 900,000 900,000 900,000 900,000            
Amortized Cost [31],[53] $ 0                        
Fair Value [3],[31],[53] 0                        
Investment, Identifier [Axis]: Sequel Youth & Family Services LLC, Senior Secured Loans - First Lien, Health Care Equipment & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Principal amount [8],[13],[28],[31] 57,200,000                        
Amortized Cost [8],[28],[31] (8,900,000)                        
Fair Value [3],[8],[28],[31] $ (1,600,000)                        
Investment, Identifier [Axis]: SitusAMC Holdings Corp                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[17],[18],[33]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor [17],[18],[33]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [16],[17],[18],[33]               $ 95,400,000          
Amortized Cost [17],[18],[33]               (94,500,000)          
Fair Value [4],[17],[18],[33]               $ (94,400,000)          
Investment, Identifier [Axis]: SitusAMC Holdings Corp | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount $ 39,600,000                        
Amortized Cost (38,700,000)                        
Fair Value $ (38,300,000)                        
Investment, Identifier [Axis]: SitusAMC Holdings Corp, Senior Secured Loans - First Lien, Real Estate                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[11],[12] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[8],[11],[12] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[11],[12],[13] $ 55,300,000                        
Amortized Cost [8],[11],[12] (54,800,000)                        
Fair Value [3],[8],[11],[12] $ (53,500,000)                        
Investment, Identifier [Axis]: Solera LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33],[38]               8.00% 8.00% 8.00% 8.00% 8.00% 8.00%
Base Rate Floor [33],[38]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33],[38]               $ 312,400,000          
Amortized Cost [33],[38]               (295,800,000)          
Fair Value [4],[33],[38]               $ (317,600,000)          
Investment, Identifier [Axis]: Solera LLC, Senior Secured Loans -Second Lien, Software & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[39] 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%            
Base Rate Floor [5],[8],[39] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13],[39] $ 312,400,000                        
Amortized Cost [8],[39] (296,900,000)                        
Fair Value [3],[8],[39] $ (307,700,000)                        
Investment, Identifier [Axis]: Sorenson Communications LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[17],[33],[38],[40],[43],[45]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Base Rate Floor [17],[33],[38],[40],[43],[45]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [16],[17],[33],[38],[40],[43],[45]               $ 59,900,000          
Amortized Cost [17],[33],[38],[40],[43],[45]               (56,900,000)          
Fair Value [4],[17],[33],[38],[40],[43],[45]               $ (60,100,000)          
Investment, Identifier [Axis]: Sorenson Communications LLC | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount $ 20,600,000                        
Amortized Cost (19,900,000)                        
Fair Value $ (19,800,000)                        
Investment, Identifier [Axis]: Sorenson Communications LLC, Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33],[43],[54],[55]               89,959 89,959 89,959 89,959 89,959 89,959
Amortized Cost [26],[33],[43],[54],[55]               $ (42,500,000)          
Fair Value [4],[26],[33],[43],[54],[55]               $ (67,500,000)          
Investment, Identifier [Axis]: Sorenson Communications LLC, Common Stock, Equity/Other, Telecommunication Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [6],[7],[8],[31] 42,731 42,731 42,731 42,731 42,731 42,731 42,731            
Amortized Cost [6],[7],[8],[31] $ (7,100,000)                        
Fair Value [3],[6],[7],[8],[31] $ (2,900,000)                        
Investment, Identifier [Axis]: Sorenson Communications LLC, Senior Secured Loans - First Lien, Telecommunication Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[11],[21],[22],[39] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[11],[21],[22],[39] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [11],[13],[21],[22],[39] $ 34,700,000                        
Amortized Cost [11],[21],[22],[39] (32,700,000)                        
Fair Value [3],[11],[21],[22],[39] (33,300,000)                        
Investment, Identifier [Axis]: Sorenson Communications LLC, Subordinated Debt, Telecommunication Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Principal amount [6],[7],[8],[13],[31] 9,700,000                        
Amortized Cost [6],[7],[8],[31] (8,900,000)                        
Fair Value [3],[6],[7],[8],[31] (9,300,000)                        
Investment, Identifier [Axis]: Sorenson Communications LLC, Subordinated Debt, Telecommunication Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Principal amount [6],[7],[8],[13],[31] 39,500,000                        
Amortized Cost [6],[7],[8],[31] (32,000,000.0)                        
Fair Value [3],[6],[7],[8],[31] $ (32,900,000)                        
Investment, Identifier [Axis]: Sorenson Communications LLC, Trade Claim, Equity/Other, Telecommunication Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [6],[7],[8],[31] 987,959 987,959 987,959 987,959 987,959 987,959 987,959            
Amortized Cost [6],[7],[8],[31] $ (1,000,000.0)                        
Fair Value [3],[6],[7],[8],[31] $ (1,000,000.0)                        
Investment, Identifier [Axis]: Sound United LLC, Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [32],[33]               12,857,143 12,857,143 12,857,143 12,857,143 12,857,143 12,857,143
Amortized Cost [32],[33]               $ (17,300,000)          
Fair Value [4],[32],[33]               $ (77,500,000)          
Investment, Identifier [Axis]: Sound United LLC, Common Stock, Equity/Other, Consumer Durables & Apparel                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8] 532,768 532,768 532,768 532,768 532,768 532,768 532,768            
Amortized Cost [8] $ (700,000)                        
Fair Value [3],[8] $ (7,000,000.0)                        
Investment, Identifier [Axis]: Source Code LLC, Senior Secured Loans - First Lien, Software & Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[11],[12],[22] 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%            
Base Rate Floor [5],[11],[12],[22] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [11],[12],[13],[22] $ 52,900,000                        
Amortized Cost [11],[12],[22] (52,000,000.0)                        
Fair Value [3],[11],[12],[22] $ (51,800,000)                        
Investment, Identifier [Axis]: Source Code LLC, Senior Secured Loans - First Lien, Software & Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[20] $ 15,300,000                        
Amortized Cost [20] (15,000,000.0)                        
Fair Value [3],[20] $ (15,000,000.0)                        
Investment, Identifier [Axis]: Source Code LLC, Senior Secured Loans—First Lien, Software & Services -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[17],[18],[40]               6.50% 6.50% 6.50% 6.50% 6.50% 6.50%
Base Rate Floor [17],[18],[40]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[17],[18],[40]               $ 53,300,000          
Amortized Cost [17],[18],[40]               (52,300,000)          
Fair Value [4],[17],[18],[40]               $ (52,200,000)          
Investment, Identifier [Axis]: Source Code LLC, Senior Secured Loans—First Lien, Software & Services -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               6.50% 6.50% 6.50% 6.50% 6.50% 6.50%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 15,300,000          
Amortized Cost [15]               (15,000,000.0)          
Fair Value [4],[15]               $ (15,000,000.0)          
Investment, Identifier [Axis]: Spins LLC, FSK CLO, Senior Secured Loans—First Lien, Software & Services -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33],[35],[40],[41]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Base Rate Floor [33],[35],[40],[41]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33],[35],[40],[41]               $ 60,700,000          
Amortized Cost [33],[35],[40],[41]               (57,300,000)          
Fair Value [4],[33],[35],[40],[41]               $ (61,300,000)          
Investment, Identifier [Axis]: Spins LLC, FSK CLO, Senior Secured Loans—First Lien, Software & Services -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 7,900,000          
Amortized Cost [15]               (7,900,000)          
Fair Value [4],[15]               $ (7,900,000)          
Investment, Identifier [Axis]: Spins LLC, Senior Secured Loans - First Lien, Software & Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[22],[37],[42] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[8],[22],[37],[42] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13],[22],[37],[42] $ 68,400,000                        
Amortized Cost [8],[22],[37],[42] (65,400,000)                        
Fair Value [3],[8],[22],[37],[42] $ (69,000,000.0)                        
Investment, Identifier [Axis]: Spins LLC, Senior Secured Loans - First Lien, Software & Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[20] $ 16,500,000                        
Amortized Cost [20] (16,500,000)                        
Fair Value [3],[20] $ (16,600,000)                        
Investment, Identifier [Axis]: Spins LLC, Senior Secured Loans - First Lien, Software & Services 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[20] $ 7,900,000                        
Amortized Cost [20] (7,900,000)                        
Fair Value [3],[20] $ (7,900,000)                        
Investment, Identifier [Axis]: Staples Canada                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[27],[33]               7.00% 7.00% 7.00% 7.00% 7.00% 7.00%
Base Rate Floor [27],[33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[27],[33]               $ 35,800,000          
Amortized Cost [27],[33]               (28,000,000.0)          
Fair Value [4],[27],[33]               $ (29,100,000)          
Investment, Identifier [Axis]: Staples Canada | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 7.00% 7.00% 7.00% 7.00% 7.00% 7.00% 7.00%            
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount             $ 77.4            
Amortized Cost $ (59,500,000)                        
Fair Value $ (57,300,000)                        
Investment, Identifier [Axis]: Staples Canada 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               7.00% 7.00% 7.00% 7.00% 7.00% 7.00%
Base Rate Floor               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount               $ 87,000,000.0          
Amortized Cost               (67,100,000)          
Fair Value               $ (70,800,000)          
Investment, Identifier [Axis]: Staples Canada, Senior Secured Loans - First Lien, Retailing                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9] 7.00% 7.00% 7.00% 7.00% 7.00% 7.00% 7.00%            
Base Rate Floor [5],[8],[9] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[9],[13] $ 31,800,000                        
Amortized Cost [8],[9] (24,900,000)                        
Fair Value [3],[8],[9] $ (23,600,000)                        
Investment, Identifier [Axis]: Star Mountain Diversified Credit Income Fund III, LP, Private Equity                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [27],[56]               23,500,000 23,500,000 23,500,000 23,500,000 23,500,000 23,500,000
Amortized Cost [27],[56]               $ (23,500,000)          
Fair Value [4],[27],[56]               $ (24,300,000)          
Investment, Identifier [Axis]: Star Mountain Diversified Credit Income Fund III, LP, Private Equity, Asset Based Finance, Diversified Financials                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [9],[13],[57] 23,500,000 23,500,000 23,500,000 23,500,000 23,500,000 23,500,000 23,500,000            
Amortized Cost [9],[57] $ (23,500,000)                        
Fair Value [3],[9],[57] $ (23,900,000)                        
Investment, Identifier [Axis]: Star Mountain Strategic Credit Income Fund IV LP, Private Equity | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares 25,000,000 25,000,000 25,000,000 25,000,000 25,000,000 25,000,000 25,000,000            
Amortized Cost $ (25,000,000.0)                        
Fair Value $ (25,300,000)                        
Investment, Identifier [Axis]: Stuart Weitzman Inc, Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33]               5,451 5,451 5,451 5,451 5,451 5,451
Amortized Cost [26],[33]               $ 0          
Fair Value [4],[26],[33]               $ 0          
Investment, Identifier [Axis]: Stuart Weitzman Inc, Common Stock, Equity/Other, Consumer Durables & Apparel                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[31] 5,451 5,451 5,451 5,451 5,451 5,451 5,451            
Amortized Cost [8],[31] $ 0                        
Fair Value [3],[8],[31] $ 0                        
Investment, Identifier [Axis]: Summit Interconnect Inc | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount $ 19,600,000             $ 10,100,000          
Amortized Cost (19,300,000)             (10,000,000.0)          
Fair Value $ (18,700,000)             $ (10,000,000.0)          
Investment, Identifier [Axis]: Summit Interconnect Inc, Senior Secured Loans—First Lien, Capital Goods-1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[17],[18],[33],[40],[45]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Base Rate Floor [17],[18],[33],[40],[45]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[17],[18],[33],[40],[45]               $ 107,900,000          
Amortized Cost [17],[18],[33],[40],[45]               (106,800,000)          
Fair Value [4],[17],[18],[33],[40],[45]               $ (106,900,000)          
Investment, Identifier [Axis]: Summit Interconnect Inc, Senior Secured Loans—First Lien, Capital Goods-2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 48,700,000          
Amortized Cost [15]               (48,700,000)          
Fair Value [4],[15]               $ (48,200,000)          
Investment, Identifier [Axis]: Summit Interconnect Inc, Senior Secured Loans - First Lien, Capital Goods 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[11],[12],[21],[22],[42] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Base Rate Floor [5],[8],[11],[12],[21],[22],[42] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[11],[12],[13],[21],[22],[42] $ 97,500,000                        
Amortized Cost [8],[11],[12],[21],[22],[42] (96,600,000)                        
Fair Value [3],[8],[11],[12],[21],[22],[42] $ (93,100,000)                        
Investment, Identifier [Axis]: Summit Interconnect Inc, Senior Secured Loans - First Lien, Capital Goods 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13] $ 39,300,000                        
Amortized Cost [8] (39,300,000)                        
Fair Value [3],[8] $ (37,500,000)                        
Investment, Identifier [Axis]: Summit Interconnect Inc, Senior Secured Loans - First Lien, Capital Goods 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[20] $ 9,400,000                        
Amortized Cost [20] (9,400,000)                        
Fair Value [3],[20] $ (9,000,000.0)                        
Investment, Identifier [Axis]: Sungard Availability Services Capital Inc                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14]               4.00% 4.00% 4.00% 4.00% 4.00% 4.00%
Interest rate, paid in kind [14]               2.80% 2.80% 2.80% 2.80% 2.80% 2.80%
Base Rate Floor [23],[26],[33],[43]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[23],[26],[33],[43]               $ 14,600,000          
Amortized Cost [23],[26],[33],[43]               (13,700,000)          
Fair Value [4],[23],[26],[33],[43]               $ (8,300,000)          
Investment, Identifier [Axis]: Sungard Availability Services Capital Inc | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14]               2.80% 2.80% 2.80% 2.80% 2.80% 2.80%
Investment, Identifier [Axis]: Sungard Availability Services Capital Inc, Senior Secured Loans, First Lien                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33],[43]               3.75% 3.75% 3.75% 3.75% 3.75% 3.75%
Interest rate, paid in kind [14],[33],[43]               3.80% 3.80% 3.80% 3.80% 3.80% 3.80%
Base Rate Floor [33],[43]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33],[43]               $ 5,800,000          
Amortized Cost [33],[43]               (5,700,000)          
Fair Value [4],[33],[43]               $ (6,000,000.0)          
Investment, Identifier [Axis]: Sungard Availability Services Capital Inc, Senior Secured Loans, First Lien | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[33],[43]               3.80% 3.80% 3.80% 3.80% 3.80% 3.80%
Investment, Identifier [Axis]: Sungard Availability Services Capital Inc, Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33]               262,516 262,516 262,516 262,516 262,516 262,516
Amortized Cost [26],[33]               $ (6,900,000)          
Fair Value [4],[26],[33]               $ 0          
Investment, Identifier [Axis]: Sungard Availability Services Capital Inc, Common Stock, Equity/Other, Software & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [7],[8],[31],[37],[44] 262,516 262,516 262,516 262,516 262,516 262,516 262,516            
Amortized Cost [7],[8],[31],[37],[44] $ (6,900,000)                        
Fair Value [3],[7],[8],[31],[37],[44] $ 0                        
Investment, Identifier [Axis]: Sungard Availability Services Capital Inc, Senior Secured Loans - First Lien, Software & Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[44] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Interest rate, paid in kind [5],[8],[44] 8.50% 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%            
Base Rate Floor [5],[8],[44] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount [8],[13],[44] $ 4,500,000                        
Amortized Cost [8],[44] (4,500,000)                        
Fair Value [3],[8],[44] $ (4,500,000)                        
Investment, Identifier [Axis]: Sungard Availability Services Capital Inc, Senior Secured Loans - First Lien, Software & Services 1 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[44] 8.50% 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%            
Investment, Identifier [Axis]: Sungard Availability Services Capital Inc, Senior Secured Loans - First Lien, Software & Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[28],[31],[44] 3.75% 3.75% 3.75% 3.75% 3.75% 3.75% 3.75%            
Interest rate, paid in kind [5],[8],[28],[31],[44] 3.80% 3.80% 3.80% 3.80% 3.80% 3.80% 3.80%            
Base Rate Floor [5],[8],[28],[31],[44] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13],[28],[31],[44] $ 6,000,000.0                        
Amortized Cost [8],[28],[31],[44] (5,800,000)                        
Fair Value [3],[8],[28],[31],[44] $ (500,000)                        
Investment, Identifier [Axis]: Sungard Availability Services Capital Inc, Senior Secured Loans - First Lien, Software & Services 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20],[44] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Interest rate, paid in kind [5],[20],[44] 8.50% 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%            
Base Rate Floor [5],[20],[44] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount [13],[20],[44] $ 1,700,000                        
Amortized Cost [20],[44] (1,700,000)                        
Fair Value [3],[20],[44] $ (1,700,000)                        
Investment, Identifier [Axis]: Sungard Availability Services Capital Inc, Senior Secured Loans -Second Lien, Software & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[28],[31],[44] 4.00% 4.00% 4.00% 4.00% 4.00% 4.00% 4.00%            
Interest rate, paid in kind [5],[8],[28],[31],[44] 2.80% 2.80% 2.80% 2.80% 2.80% 2.80% 2.80%            
Base Rate Floor [5],[8],[28],[31],[44] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount | € [8],[13],[28],[31],[44]       € 15.0                  
Amortized Cost [8],[28],[31],[44] $ (13,500,000)                        
Fair Value [3],[8],[28],[31],[44] $ 0                        
Investment, Identifier [Axis]: Sungard Availability Services Capital Inc, Senior Secured Loans -Second Lien, Software & Services | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[28],[31],[44] 2.80% 2.80% 2.80% 2.80% 2.80% 2.80% 2.80%            
Investment, Identifier [Axis]: Sweeping Corp of America Inc, Senior Secured Loans - First Lien, Commercial & Professional Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[42] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[8],[42] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13],[42] $ 72,400,000                        
Amortized Cost [8],[42] (70,300,000)                        
Fair Value [3],[8],[42] $ (72,400,000)                        
Investment, Identifier [Axis]: Sweeping Corp of America Inc, Senior Secured Loans - First Lien, Commercial & Professional Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[20] $ 5,700,000                        
Amortized Cost [20] (5,700,000)                        
Fair Value [3],[20] $ (5,700,000)                        
Investment, Identifier [Axis]: Sweeping Corp of America Inc, Senior Secured Loans—First Lien, Commercial & Professional Services -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33],[41]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor [33],[41]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33],[41]               $ 55,800,000          
Amortized Cost [33],[41]               (53,300,000)          
Fair Value [4],[33],[41]               $ (56,300,000)          
Investment, Identifier [Axis]: Sweeping Corp of America Inc, Senior Secured Loans—First Lien, Commercial & Professional Services -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor [33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33]               $ 1,800,000          
Amortized Cost [33]               (1,800,000)          
Fair Value [4],[33]               $ (1,800,000)          
Investment, Identifier [Axis]: Sweeping Corp of America Inc, Senior Secured Loans—First Lien, Commercial & Professional Services -3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 17,200,000          
Amortized Cost [15]               (17,200,000)          
Fair Value [4],[15]               $ (17,300,000)          
Investment, Identifier [Axis]: Sweeping Corp of America Inc, Senior Secured Loans—First Lien, Commercial & Professional Services -4                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               5.75% 5.75% 5.75% 5.75% 5.75% 5.75%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 3,900,000          
Amortized Cost [15]               (3,900,000)          
Fair Value [4],[15]               $ (3,900,000)          
Investment, Identifier [Axis]: Swift Worldwide Resources Holdco Ltd, Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33]               1,250,000 1,250,000 1,250,000 1,250,000 1,250,000 1,250,000
Amortized Cost [26],[33]               $ (1,200,000)          
Fair Value [4],[26],[33]               $ (1,100,000)          
Investment, Identifier [Axis]: Swift Worldwide Resources Holdco Ltd, Common Stock, Equity/Other, Energy                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[31] 1,250,000 1,250,000 1,250,000 1,250,000 1,250,000 1,250,000 1,250,000            
Amortized Cost [8],[31] $ (1,200,000)                        
Fair Value [3],[8],[31] $ (800,000)                        
Investment, Identifier [Axis]: TIBCO Software Inc, Other Senior Debt, Software & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[39] 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%            
Principal amount [8],[13],[39] $ 1,000,000.0                        
Amortized Cost [8],[39] (800,000)                        
Fair Value [3],[8],[39] $ (800,000)                        
Investment, Identifier [Axis]: TIBCO Software Inc, Preferred Stock, Equity/Other, Software & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8] 12.00% 12.00% 12.00% 12.00% 12.00% 12.00% 12.00%            
Base Rate Floor [5],[8] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%            
Number of Shares | shares [8] 133,186,150 133,186,150 133,186,150 133,186,150 133,186,150 133,186,150 133,186,150            
Amortized Cost [8] $ (127,300,000)                        
Fair Value [3],[8] $ (127,300,000)                        
Investment, Identifier [Axis]: TIBCO Software Inc, Preferred Stock, Equity/Other, Software & Services | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8] 12.00% 12.00% 12.00% 12.00% 12.00% 12.00% 12.00%            
Investment, Identifier [Axis]: TIBCO Software Inc, Senior Secured Loans - First Lien, Software & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[36],[39] 4.50% 4.50% 4.50% 4.50% 4.50% 4.50% 4.50%            
Base Rate Floor [5],[8],[36],[39] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%            
Principal amount [8],[13],[36],[39] $ 39,900,000                        
Amortized Cost [8],[36],[39] (36,300,000)                        
Fair Value [3],[8],[36],[39] $ (35,900,000)                        
Investment, Identifier [Axis]: Tangoe LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[19],[33],[35],[41],[45]               6.50% 6.50% 6.50% 6.50% 6.50% 6.50%
Base Rate Floor [19],[33],[35],[41],[45]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[19],[33],[35],[41],[45]               $ 190,200,000          
Amortized Cost [19],[33],[35],[41],[45]               (171,500,000)          
Fair Value [4],[19],[33],[35],[41],[45]               $ (147,200,000)          
Investment, Identifier [Axis]: Tangoe LLC, Senior Secured Loans - First Lien, Software & Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[37],[42] 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%            
Base Rate Floor [5],[8],[37],[42] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13],[37],[42] $ 179,500,000                        
Amortized Cost [8],[37],[42] (164,400,000)                        
Fair Value [3],[8],[37],[42] $ (146,300,000)                        
Investment, Identifier [Axis]: Tangoe LLC, Senior Secured Loans - First Lien, Software & Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[37],[42] 12.50% 12.50% 12.50% 12.50% 12.50% 12.50% 12.50%            
Principal amount [8],[13],[37],[42] $ 2,000,000.0                        
Amortized Cost [8],[37],[42] (2,000,000.0)                        
Fair Value [3],[8],[37],[42] $ (1,500,000)                        
Investment, Identifier [Axis]: Tangoe LLC, Senior Secured Loans - First Lien, Software & Services 2 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[37],[42] 12.50% 12.50% 12.50% 12.50% 12.50% 12.50% 12.50%            
Investment, Identifier [Axis]: Tekfor HoldCo, Senior Secured Loans - First Lien, Automobiles & Components                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Principal amount | € [8],[9],[13],[31],[34]       € 42.9                  
Amortized Cost [8],[9],[31],[34] $ (48,600,000)                        
Fair Value [3],[8],[9],[31],[34] $ (10,300,000)                        
Investment, Identifier [Axis]: ThermaSys Corp                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[23],[26],[33],[43]               11.00% 11.00% 11.00% 11.00% 11.00% 11.00%
Base Rate Floor [23],[26],[33],[43]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[23],[26],[33],[43]               $ 8,500,000          
Amortized Cost [23],[26],[33],[43]               (8,300,000)          
Fair Value [4],[23],[26],[33],[43]               $ (3,500,000)          
Investment, Identifier [Axis]: ThermaSys Corp | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[23],[26],[33],[43]               11.00% 11.00% 11.00% 11.00% 11.00% 11.00%
Investment, Identifier [Axis]: ThermaSys Corp, Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33],[43],[54]               17,383,026 17,383,026 17,383,026 17,383,026 17,383,026 17,383,026
Amortized Cost [26],[33],[43],[54]               $ (10,200,000)          
Fair Value [4],[26],[33],[43],[54]               $ 0          
Investment, Identifier [Axis]: ThermaSys Corp, Common Stock, Equity/Other, Capital Goods                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [7],[8],[31],[44] 17,383,026 17,383,026 17,383,026 17,383,026 17,383,026 17,383,026 17,383,026            
Amortized Cost [7],[8],[31],[44] $ (10,200,000)                        
Fair Value [3],[7],[8],[31],[44] $ 0                        
Investment, Identifier [Axis]: ThermaSys Corp, Preferred Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[33],[43]               1,529 1,529 1,529 1,529 1,529 1,529
Amortized Cost [26],[33],[43]               $ (1,700,000)          
Fair Value [4],[26],[33],[43]               $ 0          
Investment, Identifier [Axis]: ThermaSys Corp, Preferred Stock, Equity/Other, Capital Goods                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[31],[44] 1,529 1,529 1,529 1,529 1,529 1,529 1,529            
Amortized Cost [8],[31],[44] $ (1,700,000)                        
Fair Value [3],[8],[31],[44] $ 0                        
Investment, Identifier [Axis]: ThermaSys Corp, Senior Secured Loans - First Lien, Capital Goods                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[28],[31],[44] 11.00% 11.00% 11.00% 11.00% 11.00% 11.00% 11.00%            
Base Rate Floor [5],[8],[28],[31],[44] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13],[28],[31],[44] $ 9,300,000                        
Amortized Cost [8],[28],[31],[44] (8,300,000)                        
Fair Value [3],[8],[28],[31],[44] $ (5,700,000)                        
Investment, Identifier [Axis]: ThreeSixty Group, Senior Secured Loans - First Lien, Retailing 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[42] 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%            
Interest rate, paid in kind [5],[8],[42] 2.50% 2.50% 2.50% 2.50% 2.50% 2.50% 2.50%            
Base Rate Floor [5],[8],[42] 1.50% 1.50% 1.50% 1.50% 1.50% 1.50% 1.50%            
Principal amount [8],[13],[42] $ 46,200,000                        
Amortized Cost [8],[42] (46,100,000)                        
Fair Value [3],[8],[42] $ (44,800,000)                        
Investment, Identifier [Axis]: ThreeSixty Group, Senior Secured Loans - First Lien, Retailing 1 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[42] 2.50% 2.50% 2.50% 2.50% 2.50% 2.50% 2.50%            
Investment, Identifier [Axis]: ThreeSixty Group, Senior Secured Loans - First Lien, Retailing 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[42] 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%            
Interest rate, paid in kind [5],[8],[42] 2.50% 2.50% 2.50% 2.50% 2.50% 2.50% 2.50%            
Base Rate Floor [5],[8],[42] 1.50% 1.50% 1.50% 1.50% 1.50% 1.50% 1.50%            
Principal amount [8],[13],[42] $ 45,900,000                        
Amortized Cost [8],[42] (45,900,000)                        
Fair Value [3],[8],[42] $ (44,600,000)                        
Investment, Identifier [Axis]: ThreeSixty Group, Senior Secured Loans - First Lien, Retailing 2 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[42] 2.50% 2.50% 2.50% 2.50% 2.50% 2.50% 2.50%            
Investment, Identifier [Axis]: ThreeSixty Group, Senior Secured Loans—First Lien, Retailing -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33],[41]               5.00% 5.00% 5.00% 5.00% 5.00% 5.00%
Interest rate, paid in kind [14],[33],[41]               2.50% 2.50% 2.50% 2.50% 2.50% 2.50%
Base Rate Floor [33],[41]               1.50% 1.50% 1.50% 1.50% 1.50% 1.50%
Principal amount [16],[33],[41]               $ 48,500,000          
Amortized Cost [33],[41]               (48,400,000)          
Fair Value [4],[33],[41]               $ (47,700,000)          
Investment, Identifier [Axis]: ThreeSixty Group, Senior Secured Loans—First Lien, Retailing -1 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[33],[41]               2.50% 2.50% 2.50% 2.50% 2.50% 2.50%
Investment, Identifier [Axis]: ThreeSixty Group, Senior Secured Loans—First Lien, Retailing -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33],[41]               5.00% 5.00% 5.00% 5.00% 5.00% 5.00%
Interest rate, paid in kind [14],[33],[41]               2.50% 2.50% 2.50% 2.50% 2.50% 2.50%
Base Rate Floor [33],[41]               1.50% 1.50% 1.50% 1.50% 1.50% 1.50%
Principal amount [16],[33],[41]               $ 48,300,000          
Amortized Cost [33],[41]               (48,100,000)          
Fair Value [4],[33],[41]               $ (47,400,000)          
Investment, Identifier [Axis]: ThreeSixty Group, Senior Secured Loans—First Lien, Retailing -2 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[33],[41]               2.50% 2.50% 2.50% 2.50% 2.50% 2.50%
Investment, Identifier [Axis]: Time Manufacturing Co | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%
Base Rate Floor 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount | €       € 29.3             € 29.5    
Amortized Cost $ (32,500,000)             $ (32,700,000)          
Fair Value $ (27,200,000)             $ (32,900,000)          
Investment, Identifier [Axis]: Time Manufacturing Co, Senior Secured Loans - First Lien, Capital Goods 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%            
Base Rate Floor [5],[8] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[13] $ 45,500,000                        
Amortized Cost [8] (44,600,000)                        
Fair Value [3],[8] $ (43,000,000.0)                        
Investment, Identifier [Axis]: Time Manufacturing Co, Senior Secured Loans - First Lien, Capital Goods 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%            
Base Rate Floor [5],[8] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[13] $ 5,700,000                        
Amortized Cost [8] (5,700,000)                        
Fair Value [3],[8] $ (5,400,000)                        
Investment, Identifier [Axis]: Time Manufacturing Co, Senior Secured Loans - First Lien, Capital Goods 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%            
Base Rate Floor [5],[8] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[13] $ 13,700,000                        
Amortized Cost [8] (14,500,000)                        
Fair Value [3],[8] $ (12,700,000)                        
Investment, Identifier [Axis]: Time Manufacturing Co, Senior Secured Loans - First Lien, Capital Goods 4                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%            
Base Rate Floor [5],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [13],[20] $ 16,400,000                        
Amortized Cost [20] (16,400,000)                        
Fair Value [3],[20] $ (15,500,000)                        
Investment, Identifier [Axis]: Time Manufacturing Co, Senior Secured Loans—First Lien, Capital Goods - 5                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               6.50% 6.50% 6.50% 6.50% 6.50% 6.50%
Base Rate Floor [15]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount | € [15],[16]                     € 15.0    
Amortized Cost [15]               $ (17,000,000.0)          
Fair Value [4],[15]               $ (17,200,000)          
Investment, Identifier [Axis]: Time Manufacturing Co, Senior Secured Loans—First Lien, Capital Goods -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               6.50% 6.50% 6.50% 6.50% 6.50% 6.50%
Base Rate Floor [33]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [16],[33]               $ 45,800,000          
Amortized Cost [33]               (44,800,000)          
Fair Value [4],[33]               $ (44,800,000)          
Investment, Identifier [Axis]: Time Manufacturing Co, Senior Secured Loans—First Lien, Capital Goods -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33]               6.50% 6.50% 6.50% 6.50% 6.50% 6.50%
Base Rate Floor [33]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [16],[33]               $ 5,300,000          
Amortized Cost [33]               (5,300,000)          
Fair Value [4],[33]               $ (5,300,000)          
Investment, Identifier [Axis]: Time Manufacturing Co, Senior Secured Loans—First Lien, Capital Goods -3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               6.50% 6.50% 6.50% 6.50% 6.50% 6.50%
Base Rate Floor [15]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [15],[16]               $ 13,700,000          
Amortized Cost [15]               (13,700,000)          
Fair Value [4],[15]               $ (13,600,000)          
Investment, Identifier [Axis]: Time Manufacturing Co, Senior Secured Loans—First Lien, Capital Goods -4                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               6.50% 6.50% 6.50% 6.50% 6.50% 6.50%
Base Rate Floor [15]               0.80% 0.80% 0.80% 0.80% 0.80% 0.80%
Principal amount [15],[16]               $ 4,500,000          
Amortized Cost [15]               (4,500,000)          
Fair Value [4],[15]               $ (4,500,000)          
Investment, Identifier [Axis]: Toorak Capital Funding LLC, Membership Interest                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[27],[32],[33]               1,723,140 1,723,140 1,723,140 1,723,140 1,723,140 1,723,140
Amortized Cost [26],[27],[32],[33]               $ (1,900,000)          
Fair Value [4],[26],[27],[32],[33]               $ (1,700,000)          
Investment, Identifier [Axis]: Toorak Capital Partners LLC, Private Equity                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [32],[33]               158,139,270 158,139,270 158,139,270 158,139,270 158,139,270 158,139,270
Amortized Cost [32],[33]               $ (158,100,000)          
Fair Value [4],[32],[33]               $ (199,300,000)          
Investment, Identifier [Axis]: Toorak Capital Partners LLC, Private Equity 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares               40,000,000 40,000,000 40,000,000 40,000,000 40,000,000 40,000,000
Amortized Cost               $ (50,200,000)          
Fair Value               $ (50,400,000)          
Investment, Identifier [Axis]: Toorak Capital Partners LLC, Structured Mezzanine, Asset Based Finance, Real Estate - 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[32],[33]               6.50% 6.50% 6.50% 6.50% 6.50% 6.50%
Principal amount [16],[32],[33]               $ 22,000,000.0          
Amortized Cost [32],[33]               (22,000,000.0)          
Fair Value [4],[32],[33]               $ (22,000,000.0)          
Investment, Identifier [Axis]: Toorak Capital Partners LLC, Structured Mezzanine, Asset Based Finance, Real Estate - 1 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[32],[33]               6.50% 6.50% 6.50% 6.50% 6.50% 6.50%
Investment, Identifier [Axis]: Toorak Capital Partners LLC, Structured Mezzanine, Asset Based Finance, Real Estate - 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[15],[32]               6.50% 6.50% 6.50% 6.50% 6.50% 6.50%
Principal amount [15],[16],[32]               $ 8,000,000.0          
Amortized Cost [15],[32]               (8,000,000.0)          
Fair Value [4],[15],[32]               $ (8,000,000.0)          
Investment, Identifier [Axis]: Toorak Capital Partners LLC, Structured Mezzanine, Asset Based Finance, Real Estate - 2 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[15],[32]               6.50% 6.50% 6.50% 6.50% 6.50% 6.50%
Investment, Identifier [Axis]: Total Safety US Inc | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount $ 11,300,000             $ 11,800,000          
Amortized Cost (10,100,000)             (10,400,000)          
Fair Value $ (10,900,000)             $ (11,700,000)          
Investment, Identifier [Axis]: Transaction Services Group Ltd | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%
Base Rate Floor 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount           $ 124.1             $ 162.0
Amortized Cost $ (85,200,000)             $ (110,900,000)          
Fair Value $ (79,100,000)             $ (115,200,000)          
Investment, Identifier [Axis]: Transaction Services Group Ltd, Senior Secured Loans - First Lien, Software & Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9] 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%            
Base Rate Floor [5],[8],[9] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount [8],[9],[13] $ 48,300,000                        
Amortized Cost [8],[9] (34,000,000.0)                        
Fair Value [3],[8],[9] $ (30,900,000)                        
Investment, Identifier [Axis]: Transaction Services Group Ltd, Senior Secured Loans - First Lien, Software & Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9] 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%            
Base Rate Floor [5],[8],[9] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount [8],[9],[13] $ 126,200,000                        
Amortized Cost [8],[9] (122,700,000)                        
Fair Value [3],[8],[9] $ (125,500,000)                        
Investment, Identifier [Axis]: Transaction Services Group Ltd, Senior Secured Loans—First Lien, Software & Services -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[27],[33]               6.50% 6.50% 6.50% 6.50% 6.50% 6.50%
Base Rate Floor [27],[33]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount | £ [16],[27],[33]                       £ 13.9  
Amortized Cost [27],[33]               $ (17,700,000)          
Fair Value [4],[27],[33]               $ (18,300,000)          
Investment, Identifier [Axis]: Transaction Services Group Ltd, Senior Secured Loans—First Lien, Software & Services -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[27],[33]               6.50% 6.50% 6.50% 6.50% 6.50% 6.50%
Base Rate Floor [27],[33]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount [16],[27],[33]                         $ 80.3
Amortized Cost [27],[33]               $ (55,700,000)          
Fair Value [4],[27],[33]               $ (57,000,000.0)          
Investment, Identifier [Axis]: Transaction Services Group Ltd, Senior Secured Loans—First Lien, Software & Services -3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[27],[33]               6.50% 6.50% 6.50% 6.50% 6.50% 6.50%
Base Rate Floor [27],[33]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount [16],[27],[33]               $ 126,200,000          
Amortized Cost [27],[33]               (122,200,000)          
Fair Value [4],[27],[33]               (123,100,000)          
Investment, Identifier [Axis]: TruckPro LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Principal amount [16],[33],[38]               9,200,000          
Amortized Cost [33],[38]               (9,200,000)          
Fair Value [4],[33],[38]               $ (10,000,000.0)          
Investment, Identifier [Axis]: TruckPro LLC, Other Senior Debt, Capital Goods                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[39] 11.00% 11.00% 11.00% 11.00% 11.00% 11.00% 11.00%            
Principal amount [8],[13],[39] $ 9,200,000                        
Amortized Cost [8],[39] (9,200,000)                        
Fair Value [3],[8],[39] $ (9,000,000.0)                        
Investment, Identifier [Axis]: Ultra Electronics Holdings PLC, Private Equity, Equity/Other, Capital Goods                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[9],[31] 7,141,708 7,141,708 7,141,708 7,141,708 7,141,708 7,141,708 7,141,708            
Amortized Cost [8],[9],[31] $ (8,800,000)                        
Fair Value [3],[8],[9],[31] $ (7,500,000)                        
Investment, Identifier [Axis]: Ultra Electronics Holdings PLC, Senior Secured Loans - First Lien, Capital Goods 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9],[39] 3.75% 3.75% 3.75% 3.75% 3.75% 3.75% 3.75%            
Base Rate Floor [5],[8],[9],[39] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%            
Principal amount [8],[9],[13],[39] $ 1,800,000                        
Amortized Cost [8],[9],[39] (1,800,000)                        
Fair Value [3],[8],[9],[39] $ (1,700,000)                        
Investment, Identifier [Axis]: Ultra Electronics Holdings PLC, Senior Secured Loans - First Lien, Capital Goods 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9],[39] 3.75% 3.75% 3.75% 3.75% 3.75% 3.75% 3.75%            
Base Rate Floor [5],[8],[9],[39] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount [8],[9],[13],[39] $ 1,400,000                        
Amortized Cost [8],[9],[39] (1,600,000)                        
Fair Value [3],[8],[9],[39] $ (1,200,000)                        
Investment, Identifier [Axis]: Ultra Electronics Holdings PLC, Subordinated Debt, Capital Goods 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9] 7.25% 7.25% 7.25% 7.25% 7.25% 7.25% 7.25%            
Base Rate Floor [5],[8],[9] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%            
Principal amount [8],[9],[13] $ 62,400,000                        
Amortized Cost [8],[9] (60,600,000)                        
Fair Value [3],[8],[9] $ (58,000,000.0)                        
Investment, Identifier [Axis]: Ultra Electronics Holdings PLC, Subordinated Debt, Capital Goods 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9] 9.00% 9.00% 9.00% 9.00% 9.00% 9.00% 9.00%            
Interest rate, paid in kind [5],[8],[9] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Base Rate Floor [5],[8],[9] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%            
Principal amount [8],[9],[13] $ 58,200,000                        
Amortized Cost [8],[9] (56,500,000)                        
Fair Value [3],[8],[9] $ (52,900,000)                        
Investment, Identifier [Axis]: Ultra Electronics Holdings PLC, Subordinated Debt, Capital Goods 2 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[9] 9.00% 9.00% 9.00% 9.00% 9.00% 9.00% 9.00%            
Investment, Identifier [Axis]: Unifrax I LLC / Unifrax Holding Co | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 3.75% 3.75% 3.75% 3.75% 3.75% 3.75% 3.75%            
Base Rate Floor 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount $ 2,800,000                        
Amortized Cost (2,700,000)                        
Fair Value $ (2,600,000)                        
Investment, Identifier [Axis]: Valeo Foods Group Ltd | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%            
Base Rate Floor 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount | £         £ 9.3                
Amortized Cost $ (11,800,000)                        
Fair Value $ (9,700,000)                        
Investment, Identifier [Axis]: Valeo Foods Group Ltd, Senior Secured Loans -Second Lien, Food, Beverage & Tobacco 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9] 7.50% 7.50% 7.50% 7.50% 7.50% 7.50% 7.50%            
Base Rate Floor [5],[8],[9] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount | € [8],[9],[13]       € 3.8                  
Amortized Cost [8],[9] $ (4,000,000.0)                        
Fair Value [3],[8],[9] $ (3,500,000)                        
Investment, Identifier [Axis]: Valeo Foods Group Ltd, Senior Secured Loans -Second Lien, Food, Beverage & Tobacco 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[9],[20] 7.50% 7.50% 7.50% 7.50% 7.50% 7.50% 7.50%            
Base Rate Floor [5],[9],[20] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount [9],[13],[20] $ 2,300,000                        
Amortized Cost [9],[20] (3,100,000)                        
Fair Value [3],[9],[20] $ (3,000,000.0)                        
Investment, Identifier [Axis]: Valeo Foods Group Ltd, Senior Secured Loans—Second Lien, Food, Beverage & Tobacco -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[27],[33]               8.00% 8.00% 8.00% 8.00% 8.00% 8.00%
Base Rate Floor [27],[33]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount | £ [16],[27],[33]                       £ 9.3  
Amortized Cost [27],[33]               $ (12,300,000)          
Fair Value [4],[27],[33]               $ (12,200,000)          
Investment, Identifier [Axis]: Valeo Foods Group Ltd, Senior Secured Loans—Second Lien, Food, Beverage & Tobacco -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15],[27]               7.50% 7.50% 7.50% 7.50% 7.50% 7.50%
Base Rate Floor [15],[27]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount | € [15],[16],[27]                     € 6.2    
Amortized Cost [15],[27]               $ (7,200,000)          
Fair Value [4],[15],[27]               $ (6,800,000)          
Investment, Identifier [Axis]: Vantage Specialty Chemicals Inc                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[33],[38]               8.25% 8.25% 8.25% 8.25% 8.25% 8.25%
Base Rate Floor [33],[38]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[33],[38]               $ 800,000          
Amortized Cost [33],[38]               (700,000)          
Fair Value [4],[33],[38]               $ (700,000)          
Investment, Identifier [Axis]: Vantage Specialty Chemicals Inc, Senior Secured Loans -Second Lien, Materials                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[39] 8.25% 8.25% 8.25% 8.25% 8.25% 8.25% 8.25%            
Base Rate Floor [5],[8],[39] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount | € [8],[13],[39]       € 0.8                  
Amortized Cost [8],[39] $ (700,000)                        
Fair Value [3],[8],[39] $ (700,000)                        
Investment, Identifier [Axis]: Varsity Brands Inc | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 3.50% 3.50% 3.50% 3.50% 3.50% 3.50% 3.50%            
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount $ 4,000,000.0                        
Amortized Cost (3,800,000)                        
Fair Value $ (3,700,000)                        
Investment, Identifier [Axis]: Versatile Processing Group Inc, Class A - 2 Units                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[54]               3,637,500 3,637,500 3,637,500 3,637,500 3,637,500 3,637,500
Amortized Cost [26],[54]               $ (3,600,000)          
Fair Value [4],[26],[54]               $ 0          
Investment, Identifier [Axis]: Versatile Processing Group Inc, Class A - 2 Units, Equity/Other, Materials                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [7],[31] 3,637,500 3,637,500 3,637,500 3,637,500 3,637,500 3,637,500 3,637,500            
Amortized Cost [7],[31] $ (3,600,000)                        
Fair Value [3],[7],[31] $ 0                        
Investment, Identifier [Axis]: Version1 Software Ltd, Senior Secured Loans - First Lien, Software & Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Interest rate, paid in kind [5],[8],[9] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Base Rate Floor [5],[8],[9] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount | € [8],[9],[13]       € 2.5                  
Amortized Cost [8],[9] $ (2,400,000)                        
Fair Value [3],[8],[9] $ (2,400,000)                        
Investment, Identifier [Axis]: Version1 Software Ltd, Senior Secured Loans - First Lien, Software & Services 1 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[9] 1.70% 1.70% 1.70% 1.70% 1.70% 1.70% 1.70%            
Investment, Identifier [Axis]: Version1 Software Ltd, Senior Secured Loans - First Lien, Software & Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Interest rate, paid in kind [5],[8],[9] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Base Rate Floor [5],[8],[9] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount [8],[9],[13] $ 4,000,000.0                        
Amortized Cost [8],[9] (4,700,000)                        
Fair Value [3],[8],[9] $ (4,400,000)                        
Investment, Identifier [Axis]: Version1 Software Ltd, Senior Secured Loans - First Lien, Software & Services 2 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[9] 1.70% 1.70% 1.70% 1.70% 1.70% 1.70% 1.70%            
Investment, Identifier [Axis]: Version1 Software Ltd, Senior Secured Loans - First Lien, Software & Services 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[9],[20] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Interest rate, paid in kind [5],[9],[20] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Base Rate Floor [5],[9],[20] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount [9],[13],[20]           $ 2.4              
Amortized Cost [9],[20] $ (2,400,000)                        
Fair Value [3],[9],[20] $ (2,300,000)                        
Investment, Identifier [Axis]: Version1 Software Ltd, Senior Secured Loans - First Lien, Software & Services 3 | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[9],[20] 1.70% 1.70% 1.70% 1.70% 1.70% 1.70% 1.70%            
Investment, Identifier [Axis]: VetCor Professional Practices LLC, Senior Secured Loans - First Lien, Health Care Equipment & Services 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[8] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [8],[13] $ 75,200,000                        
Amortized Cost [8] (74,300,000)                        
Fair Value [3],[8] $ (74,500,000)                        
Investment, Identifier [Axis]: VetCor Professional Practices LLC, Senior Secured Loans - First Lien, Health Care Equipment & Services 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount [13],[20] $ 18,000,000.0                        
Amortized Cost [20] (18,000,000.0)                        
Fair Value [3],[20] $ (17,800,000)                        
Investment, Identifier [Axis]: VetCor Professional Practices LLC, Senior Secured Loans - First Lien, Health Care Equipment & Services 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%            
Base Rate Floor [5],[20] 0.80% 0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Principal amount | € [13],[20]       € 6.7                  
Amortized Cost [20] $ (6,600,000)                        
Fair Value [3],[20] $ (6,700,000)                        
Investment, Identifier [Axis]: Warren Resources Inc 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[32],[33]               9.00% 9.00% 9.00% 9.00% 9.00% 9.00%
Interest rate, paid in kind [14],[32],[33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Base Rate Floor [32],[33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[32],[33]               $ 18,700,000          
Amortized Cost [32],[33]               (17,400,000)          
Fair Value [4],[32],[33]               $ (18,700,000)          
Investment, Identifier [Axis]: Warren Resources Inc, Common Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[32],[33]               3,483,788 3,483,788 3,483,788 3,483,788 3,483,788 3,483,788
Amortized Cost [26],[32],[33]               $ (12,800,000)          
Fair Value [4],[26],[32],[33]               $ (20,400,000)          
Investment, Identifier [Axis]: Warren Resources Inc, Common Stock, Equity/Other, Energy                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[31],[34] 3,483,788 3,483,788 3,483,788 3,483,788 3,483,788 3,483,788 3,483,788            
Amortized Cost [8],[31],[34] $ (12,800,000)                        
Fair Value [3],[8],[31],[34] $ (24,800,000)                        
Investment, Identifier [Axis]: Warren Resources Inc, Senior Secured Loans - First Lien, Energy                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[34] 9.00% 9.00% 9.00% 9.00% 9.00% 9.00% 9.00%            
Interest rate, paid in kind [5],[8],[34] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Base Rate Floor [5],[8],[34] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13],[34] $ 18,600,000                        
Amortized Cost [8],[34] (17,600,000)                        
Fair Value [3],[8],[34] $ (18,600,000)                        
Investment, Identifier [Axis]: Warren Resources Inc, Senior Secured Loans - First Lien, Energy | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[34] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Investment, Identifier [Axis]: Watchfire Enterprises Inc | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               8.25% 8.25% 8.25% 8.25% 8.25% 8.25%
Base Rate Floor               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount               $ 9,300,000          
Amortized Cost               (9,300,000)          
Fair Value               $ (9,300,000)          
Investment, Identifier [Axis]: Wealth Enhancement Group LLC, Senior Secured Loans - First Lien, Diversified Financials 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Base Rate Floor [5],[8],[9] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[9],[13] $ 28,700,000                        
Amortized Cost [8],[9] (28,600,000)                        
Fair Value [3],[8],[9] $ (28,500,000)                        
Investment, Identifier [Axis]: Wealth Enhancement Group LLC, Senior Secured Loans - First Lien, Diversified Financials 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[9],[20] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Base Rate Floor [5],[9],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [9],[13],[20] $ 5,700,000                        
Amortized Cost [9],[20] (5,700,000)                        
Fair Value [3],[9],[20] $ (5,700,000)                        
Investment, Identifier [Axis]: Wealth Enhancement Group LLC, Senior Secured Loans - First Lien, Diversified Financials 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[9],[20] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Base Rate Floor [5],[9],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [9],[13],[20] $ 2,100,000                        
Amortized Cost [9],[20] (2,100,000)                        
Fair Value [3],[9],[20] $ (2,100,000)                        
Investment, Identifier [Axis]: Wealth Enhancement Group LLC, Senior Secured Loans—First Lien, Diversified Financials - 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[27],[33]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor [27],[33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[27],[33]               $ 15,100,000          
Amortized Cost [27],[33]               (15,000,000.0)          
Fair Value [4],[27],[33]               $ (15,100,000)          
Investment, Identifier [Axis]: Wealth Enhancement Group LLC, Senior Secured Loans—First Lien, Diversified Financials -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[27],[33]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor [27],[33]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[27],[33]               $ 700,000          
Amortized Cost [27],[33]               (700,000)          
Fair Value [4],[27],[33]               $ (700,000)          
Investment, Identifier [Axis]: Wealth Enhancement Group LLC, Senior Secured Loans—First Lien, Diversified Financials -3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15],[27]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor [15],[27]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16],[27]               $ 13,200,000          
Amortized Cost [15],[27]               (13,200,000)          
Fair Value [4],[15],[27]               $ (13,200,000)          
Investment, Identifier [Axis]: Wealth Enhancement Group LLC, Senior Secured Loans—First Lien, Diversified Financials -4                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15],[27]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor [15],[27]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16],[27]               $ 1,000,000.0          
Amortized Cost [15],[27]               (1,000,000.0)          
Fair Value [4],[15],[27]               $ (1,000,000.0)          
Investment, Identifier [Axis]: West Corp 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 4.00% 4.00% 4.00% 4.00% 4.00% 4.00% 4.00%            
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount $ 12,100,000                        
Amortized Cost (12,000,000.0)                        
Fair Value $ (10,500,000)                        
Investment, Identifier [Axis]: West Corp 2 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 3.50% 3.50% 3.50% 3.50% 3.50% 3.50% 3.50%            
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount $ 2,500,000                        
Amortized Cost (2,500,000)                        
Fair Value $ (2,100,000)                        
Investment, Identifier [Axis]: West Corp L+350 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               3.50% 3.50% 3.50% 3.50% 3.50% 3.50%
Base Rate Floor               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount               $ 2,600,000          
Amortized Cost               (2,500,000)          
Fair Value               $ (2,400,000)          
Investment, Identifier [Axis]: West Corp L+400 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               4.00% 4.00% 4.00% 4.00% 4.00% 4.00%
Base Rate Floor               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount               $ 12,400,000          
Amortized Cost               (12,200,000)          
Fair Value               $ (11,800,000)          
Investment, Identifier [Axis]: Wittur Holding GmbH                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[27],[33]               8.50% 8.50% 8.50% 8.50% 8.50% 8.50%
Interest rate, paid in kind [14]               0.50% 0.50% 0.50% 0.50% 0.50% 0.50%
Base Rate Floor [27],[33]               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount | € [16],[27],[33]                     € 112.8    
Amortized Cost [27],[33]               $ (120,900,000)          
Fair Value [4],[27],[33]               $ (120,900,000)          
Investment, Identifier [Axis]: Wittur Holding GmbH | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 8.50% 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%            
Interest rate, paid in kind 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%            
Base Rate Floor 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount | €       € 120.8                  
Amortized Cost $ (131,900,000)                        
Fair Value $ (88,500,000)                        
Investment, Identifier [Axis]: Wittur Holding GmbH | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [14],[27],[33]               0.50% 0.50% 0.50% 0.50% 0.50% 0.50%
Investment, Identifier [Axis]: Wittur Holding GmbH 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate               8.50% 8.50% 8.50% 8.50% 8.50% 8.50%
Interest rate, paid in kind               50.00% 50.00% 50.00% 50.00% 50.00% 50.00%
Base Rate Floor               0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount | €                     € 120.5    
Amortized Cost               $ (131,500,000)          
Fair Value               $ (129,300,000)          
Investment, Identifier [Axis]: Wittur Holding GmbH 1 | Maximum | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind               50.00% 50.00% 50.00% 50.00% 50.00% 50.00%
Investment, Identifier [Axis]: Wittur Holding GmbH, Senior Secured Loans -Second Lien, Capital Goods                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[9] 8.50% 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%            
Interest rate, paid in kind [5],[8],[9] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%            
Base Rate Floor [5],[8],[9] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Principal amount [8],[9],[13] $ 113,100,000                        
Amortized Cost [8],[9] (122,000,000.0)                        
Fair Value [3],[8],[9] $ (82,700,000)                        
Investment, Identifier [Axis]: Wittur Holding GmbH, Senior Secured Loans -Second Lien, Capital Goods | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[9] 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%            
Investment, Identifier [Axis]: Woolpert Inc | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount $ 53,100,000             $ 53,500,000          
Amortized Cost (52,700,000)             (53,000,000.0)          
Fair Value $ (51,200,000)             $ (54,300,000)          
Investment, Identifier [Axis]: Woolpert Inc, Revolving Credit Facility, Senior Secured Loans—First Lien, Capital Goods -1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[17],[18],[33],[40],[41],[45]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Base Rate Floor [17],[18],[33],[40],[41],[45]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[17],[18],[33],[40],[41],[45]               $ 139,200,000          
Amortized Cost [17],[18],[33],[40],[41],[45]               (132,500,000)          
Fair Value [4],[17],[18],[33],[40],[41],[45]               $ (141,200,000)          
Investment, Identifier [Axis]: Woolpert Inc, Revolving Credit Facility, Senior Secured Loans—First Lien, Capital Goods -2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[15]               6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Base Rate Floor [15]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [15],[16]               $ 25,600,000          
Amortized Cost [15]               (25,600,000)          
Fair Value [4],[15]               $ (25,900,000)          
Investment, Identifier [Axis]: Woolpert Inc, Senior Secured Loans - First Lien, Capital Goods 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8],[11],[12],[21],[22],[42] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Base Rate Floor [5],[8],[11],[12],[21],[22],[42] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[11],[12],[13],[21],[22],[42] $ 159,900,000                        
Amortized Cost [8],[11],[12],[21],[22],[42] (153,800,000)                        
Fair Value [3],[8],[11],[12],[21],[22],[42] $ (154,200,000)                        
Investment, Identifier [Axis]: Woolpert Inc, Senior Secured Loans - First Lien, Capital Goods 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[20] $ 3,700,000                        
Amortized Cost [20] (3,700,000)                        
Fair Value [3],[20] $ (3,500,000)                        
Investment, Identifier [Axis]: Worldwise Inc | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount $ 64,800,000                        
Amortized Cost (61,800,000)                        
Fair Value $ (61,500,000)                        
Investment, Identifier [Axis]: Worldwise Inc, Class A Private Equity, Equity/Other, Household & Personal Products                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[31] 32,109 32,109 32,109 32,109 32,109 32,109 32,109            
Amortized Cost [8],[31] $ (1,600,000)                        
Fair Value [3],[8],[31] $ (1,600,000)                        
Investment, Identifier [Axis]: Worldwise Inc, Class B Private Equity, Equity/Other, Household & Personal Products                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[31] 32,109 32,109 32,109 32,109 32,109 32,109 32,109            
Amortized Cost [8],[31] $ (1,600,000)                        
Fair Value [3],[8],[31] $ (900,000)                        
Investment, Identifier [Axis]: Worldwise Inc, Senior Secured Loans - First Lien, Household & Personal Products 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13] $ 26,600,000                        
Amortized Cost [8] (26,600,000)                        
Fair Value [3],[8] $ (25,200,000)                        
Investment, Identifier [Axis]: Worldwise Inc, Senior Secured Loans - First Lien, Household & Personal Products 2                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13] $ 20,100,000                        
Amortized Cost [8] (19,900,000)                        
Fair Value [3],[8] $ (19,000,000.0)                        
Investment, Identifier [Axis]: Worldwise Inc, Senior Secured Loans - First Lien, Household & Personal Products 3                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[8] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor [5],[8] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [8],[13] $ 6,800,000                        
Amortized Cost [8] (6,800,000)                        
Fair Value [3],[8] $ (6,500,000)                        
Investment, Identifier [Axis]: Worldwise Inc, Senior Secured Loans - First Lien, Household & Personal Products 4                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[20] $ 15,500,000                        
Amortized Cost [20] (15,500,000)                        
Fair Value [3],[20] $ (14,700,000)                        
Investment, Identifier [Axis]: Worldwise Inc, Senior Secured Loans - First Lien, Household & Personal Products 5                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [5],[20] 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%            
Base Rate Floor [5],[20] 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%            
Principal amount [13],[20] $ 7,400,000                        
Amortized Cost [20] (7,400,000)                        
Fair Value [3],[20] $ (7,000,000.0)                        
Investment, Identifier [Axis]: Yak Access LLC | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%
Base Rate Floor 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Principal amount $ 800,000             $ 800,000          
Amortized Cost (600,000)             (600,000)          
Fair Value $ (500,000)             $ (700,000)          
Investment, Identifier [Axis]: Zeta Interactive Holdings Corp, Common Stock | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares 1,080,789 1,080,789 1,080,789 1,080,789 1,080,789 1,080,789 1,080,789 1,766,696 1,766,696 1,766,696 1,766,696 1,766,696 1,766,696
Amortized Cost $ (9,200,000)             $ (15,100,000)          
Fair Value $ (7,100,000)             $ (14,900,000)          
Investment, Identifier [Axis]: Zeta Interactive Holdings Corp, Common Stock 1                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [26],[32],[33]               3,610,212 3,610,212 3,610,212 3,610,212 3,610,212 3,610,212
Amortized Cost [26],[32],[33]               $ (30,800,000)          
Fair Value [4],[26],[32],[33]               $ (30,400,000)          
Investment, Identifier [Axis]: Zeta Interactive Holdings Corp, Common Stock, Equity/Other, Software & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares [8],[31],[39] 2,208,577 2,208,577 2,208,577 2,208,577 2,208,577 2,208,577 2,208,577            
Amortized Cost [8],[31],[39] $ (18,800,000)                        
Fair Value [3],[8],[31],[39] $ (14,600,000)                        
Investment, Identifier [Axis]: athenahealth Inc | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%            
Principal amount $ 5,500,000                        
Amortized Cost (4,800,000)                        
Fair Value $ (4,400,000)                        
Investment, Identifier [Axis]: athenahealth Inc 1 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 3.50% 3.50% 3.50% 3.50% 3.50% 3.50% 3.50%            
Base Rate Floor 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%            
Principal amount           $ 6.8              
Amortized Cost $ (6,200,000)                        
Fair Value $ (6,100,000)                        
Investment, Identifier [Axis]: athenahealth Inc 2 | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate 3.50% 3.50% 3.50% 3.50% 3.50% 3.50% 3.50%            
Base Rate Floor 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%            
Principal amount           $ 1.2              
Amortized Cost $ (1,100,000)                        
Fair Value $ (1,000,000.0)                        
Investment, Identifier [Axis]: athenahealth Inc, Preferred Stock                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind 10.80% 10.80% 10.80% 10.80% 10.80% 10.80% 10.80%            
Investment, Identifier [Axis]: athenahealth Inc, Preferred Stock | Credit Opportunities Partners JV, LLC                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Number of Shares | shares 50,000 50,000 50,000 50,000 50,000 50,000 50,000            
Amortized Cost $ (47,500,000)                        
Fair Value $ (42,800,000)                        
Investment, Identifier [Axis]: athenahealth Inc, Preferred Stock | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind 10.80% 10.80% 10.80% 10.80% 10.80% 10.80% 10.80%            
Investment, Identifier [Axis]: athenahealth Inc, Preferred Stock, Equity/Other, Health Care Equipment & Services                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[44] 10.80% 10.80% 10.80% 10.80% 10.80% 10.80% 10.80%            
Number of Shares | shares [8],[44] 267,493 267,493 267,493 267,493 267,493 267,493 267,493            
Amortized Cost [8],[44] $ (262,200,000)                        
Fair Value [3],[8],[44] $ (229,000,000.0)                        
Investment, Identifier [Axis]: athenahealth Inc, Preferred Stock, Equity/Other, Health Care Equipment & Services | Maximum                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Interest rate, paid in kind [5],[8],[44] 10.80% 10.80% 10.80% 10.80% 10.80% 10.80% 10.80%            
Investment, Identifier [Axis]: hibu Inc                          
Investment Company, Nonconsolidated Subsidiary [Line Items]                          
Variable rate [14],[17],[18],[33],[40],[41],[45]               6.25% 6.25% 6.25% 6.25% 6.25% 6.25%
Base Rate Floor [17],[18],[33],[40],[41],[45]               1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Principal amount [16],[17],[18],[33],[40],[41],[45]               $ 101,600,000          
Amortized Cost [17],[18],[33],[40],[41],[45]               (96,600,000)          
Fair Value [4],[17],[18],[33],[40],[41],[45]               $ (104,600,000)          
[1] Security may be an obligation of one or more entities affiliated with the named company
[2] Security may be an obligation of one or more entities affiliated with the named company.
[3] See Note 8 for additional information regarding the fair value of the Company's financial instruments
[4] Fair value determined by the Company’s board of directors (see Note 8).
[5] 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, 2022, the three-month London Interbank Offered Rate, or LIBOR or “L”, was 3.75%, the Euro Interbank Offered Rate, or EURIBOR, was 1.17%, Canadian Dollar Offer Rate, or CDOR was 4.20%, the Australian Bank Bill Swap Bid Rate, or BBSY, or “B”, was 3.11%, the Reykjavik Interbank Offered Rate, or REIBOR or "R", was 6.30%, the Stockholm Interbank Offered Rate, or STIBOR or "SR", was 1.73%, the Sterling Interbank Offered Rate, or SONIA or "SA", was 2.19%, the Secured Overnight Financing Rate, or SOFR, was 3.59% and the U.S. Prime Lending Rate, or Prime, was 6.25%. PIK means paid-in-kind. PIK income accruals may be adjusted based on the fair value of the underlying investment. Variable rate securities with no floor rate use the respective benchmark rate in all cases.
[6] 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).
[7] 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).
[8] Security or portion thereof is pledged as collateral supporting the amounts outstanding under the Senior Secured Revolving Credit Facility (see Note 9).
[9] 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, 2022, 76.5% of the Company’s total assets represented qualifying assets.
[10] 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).
[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] Denominated in U.S dollars unless otherwise noted.
[14] 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, 2021, the three-month London Interbank Offered Rate, or LIBOR or “L”, was 0.21%, the Euro Interbank Offered Rate, or EURIBOR, was (0.57)%, Canadian Dollar Offer Rate, or CDOR was 0.52%, the Bank Bill Swap Bid Rate, or BBSY was 0.12%, the Reykjavik Interbank Offered Rate, or REIBOR, was 2.65%, the Stockholm Interbank Offered Rate, or STIBOR, was (0.05)%, the Sterling Overnight Index Average, or SONIA, was .19%, the Secured Overnight Financing Rate, or SOFR, was .05%, and the U.S. Prime Lending Rate, or Prime, was 3.25%. PIK means paid-in-kind. PIK income accruals may be adjusted based on the fair value of the underlying investment.
[15] Security is an unfunded commitment. Reflects the stated spread at the time of commitment, but may not be the actual rate received upon funding.
[16] Denominated in U.S. dollars unless otherwise noted.
[17] 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).
[18] 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).
[19] 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).
[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] Asset is on non-accrual status.
[24] Security held within IC Arches Investments LLC, a wholly-owned subsidiary of the Company.
[25] Security held within IC II Arches Investments, LLC, a wholly-owned subsidiary of the Company.
[26] Security is non-income producing.
[27] 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, 2021, 75.1% of the Company’s total assets represented qualifying assets.
[28] Asset is on non-accrual status.
[29] Security held within IC Arches Investments, LLC, a wholly-owned subsidiary of the Company.
[30] Security held within IC II Arches Investments, LLC, a wholly-owned subsidiary of the Company.
[31] Security is non-income producing.
[32] 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, 2021, 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, 2021, 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, 2021:
Portfolio CompanyFair Value at December 31, 2020
Gross Additions(1)
Gross Reductions(2)
Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation)Fair Value at December 31, 2021
Interest Income(3)
PIK Income(3)
Fee Income(3)
Dividend Income(3)
Senior Secured Loans—First Lien
 Advanced Lighting Technologies Inc $12.0 $4.1 $(15.9)$(4.6)$4.4 $— $— $— $— $— 
 Amtek Global Technology Pte Ltd 59.7 2.4 — — (27.3)34.8 1.1 1.4 — — 
 ATX Networks Corp — 46.8 — — — 46.8 1.3 — — — 
 HM Dunn Co Inc(4)
— 49.2 (7.1)(8.5)— 33.6 0.5 — — — 
 HM Dunn Co Inc(4)
— 14.0 (19.0)7.0 — 2.0 0.4 0.8 — — 
 One Call Care Management Inc — 9.7 (5.1)0.1 0.3 5.0 0.3 — 0.1 — 
 Production Resource Group LLC — 124.9 — — 8.4 133.3 5.4 3.8 — — 
 Production Resource Group LLC — 0.1 — — — 0.1 — — — — 
 Production Resource Group LLC — 60.6 (0.4)— 4.2 64.4 2.8 0.8 0.4 — 
 Production Resource Group LLC — 20.2 (0.1)— 0.1 20.2 0.4 — 0.1 — 
 Sound United LLC 14.9 — (15.0)— 0.1 — 0.4 — — — 
 Warren Resources Inc(4)
— 19.3 (2.0)0.1 1.3 18.7 1.3 0.1 — — 
Senior Secured Loans—Second Lien
Amtek Global Technology Pte Ltd0.1 (1.8)— (10.4)12.1 — (1.9)— — — 
Sound United LLC20.9 1.7 (22.6)— — — — 1.0 — — 
Other Senior Secured Debt
Advanced Lighting Technologies Inc— — (0.7)(22.9)23.6 — — — — — 
JW Aluminum Co(4)
— 75.5 — — 5.5 81.0 6.2 — — — 
One Call Care Management Inc(4)
— 43.5 (21.9)— 1.9 23.5 0.4 1.6 — — 
Subordinated Debt
ATX Networks Corp— 4.8 — — 2.3 7.1 — — — — 
Hilding Anders32.4 — — — 14.2 46.6 — — — — 
Hilding Anders— — — — — — — — — — 
Hilding Anders30.3 — — — (30.3)— — — — — 
Asset Based Finance
 801 5th Ave, Seattle, Structure Mezzanine 29.4 25.7 — — 2.1 57.2 3.6 1.3 — — 
 801 5th Ave, Seattle, Private Equity 10.3 9.6 — — 3.2 23.1 — — — — 
 Avida Holding AB, Common Stock 38.3 9.1 — — 4.9 52.3 — — — — 
 Kilter Finance, Preferred Stock 0.2 34.4 — — 1.5 36.1 1.3 1.2 — — 
 Kilter Finance, Private Equity 0.2 0.3 — — — 0.5 — — — — 
 KKR Rocket Loans Aggregator LLC, Partnership Interest — 1.4 — — — 1.4 — — — 0.1 
 My Community Homes SFR PropCo 2, Private Equity — 33.0 — — — 33.0 — — — — 
 Prime St LLC, Private Equity 3.9 4.6 — — 0.6 9.1 — — — — 
 Prime St LLC, Structured Mezzanine 22.8 27.6 — — 2.0 52.4 0.9 2.2 — — 
Portfolio CompanyFair Value at December 31, 2020
Gross Additions(1)
Gross Reductions(2)
Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation)Fair Value at December 31, 2021
Interest Income(3)
PIK Income(3)
Fee Income(3)
Dividend Income(3)
 Toorak Capital Funding LLC, Membership Interest $6.6 $1.3 $(4.9)$— $(1.3)$1.7 $— $— $— $— 
 Toorak Capital LLC, Membership Interest 235.9 2.3 (50.2)10.2 1.1 199.3 — — — 18.7 
 Toorak Capital Partners LLC, Structured Mezzanine— 73.0 (51.0)— — 22.0 0.2 — — — 
Credit Opportunities Partners JV, LLC
Credit Opportunities Partners JV, LLC712.5 586.4 — — 97.3 1,396.2 — — — 126.9 
Equity/Other
 Advanced Lighting Technologies Inc, Common Stock — — — (16.5)16.5 — — — — — 
 Advanced Lighting Technologies Inc, Warrant — — — (0.1)0.1 — — — — — 
 Amtek Global Technology Pte Ltd, Common Stock — — — — — — — — — — 
 Amtek Global Technology Pte Ltd, Ordinary Shares — — — — — — — — — — 
 Amtek Global Technology Pte Ltd, Trade Claim — — (1.4)0.4 1.0 — — — — — 
 Amtek Global Technology Pte Ltd, Private Equity — — — — — — — — — — 
 ATX Networks Corp, Common Stock — — — — — — — — — — 
 Hilding Anders, Class A Common Stock — — — — — — — — — — 
 Hilding Anders, Class B Common Stock — — — — — — — — — — 
 Hilding Anders, Class C Common Stock — — — — — — — — — — 
 Hilding Anders, Equity Options — — — — — — — — — — 
 HM Dunn Co Inc, Preferred Stock, Series A(4)
— 7.1 — — — 7.1 — — — — 
 HM Dunn Co Inc, Preferred Stock, Series B(4)
— — — — — — — — — — 
 JW Aluminum Co, Common Stock(4)
— — — — — — — — — — 
 JW Aluminum Co, Preferred Stock(4)
— 177.9 — — (55.3)122.6 0.4 20.9 — — 
 One Call Care Management Inc, Common Stock(4)
— 4.5 (2.2)(0.2)0.3 2.4 — — — — 
 One Call Care Management Inc, Preferred Stock A(4)
— 48.6 (23.7)(2.1)3.3 26.1 — — — — 
 One Call Care Management Inc, Preferred Stock B(4)
— 15.7 (8.8)1.1 1.2 9.2 — 0.8 — — 
 Production Resource Group LLC, Preferred Stock, Series A PIK — 18.1 — — (0.7)17.4 — — — — 
 Production Resource Group LLC, Preferred Stock, Series B PIK — — — — — — — — — — 
 Sound United LLC, Class A Units — — — (1.1)1.1 — — — — — 
 Sound United LLC, Common Stock 29.3 — — — 48.2 77.5 — — — 20.0 
 Sound United LLC, Series I Units — — — (0.5)0.5 — — — — — 
 Sound United LLC, Series II Units — — — (0.5)0.5 — — — — — 
 Warren Resources Inc, Common Stock — 12.8 — — 7.6 20.4 — — — — 
Total$1,259.7 $1,568.4 $(252.0)$(48.5)$156.5 $2,684.1 $25.0 $35.9 $0.6 $165.7 
______________
(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, 2021.
(4)The Company held this investment as of December 31, 2020 but it was not deemed to be an “control” of the portfolio company as of December 31, 2020. Transfers in or out have been presented at amortized cost.
[33] Security or portion thereof is pledged as collateral supporting the amounts outstanding under the Senior Secured Revolving Credit Facility (see Note 9).
[34] 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, 2022, 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, 2022, 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, 2022:
Portfolio Company
Fair Value at December 31, 2021
Gross Additions(1)
Gross Reductions(2)
Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation)
Fair Value at September 30, 2022
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)$34.8 $— $(16.9)$(3.2)$(4.4)$10.3 $— $— $— $— 
 ATX Networks Corp 46.8 0.4 (6.1)— — 41.1 2.0 1.0 — — 
 HM Dunn Co Inc33.6 2.0 — — — 35.6 — 2.0 — — 
 HM Dunn Co Inc2.0 — (2.0)— — — — — — — 
 One Call Care Management Inc 5.0 — — — (1.3)3.7 0.3 — — — 
 Production Resource Group LLC 133.3 15.1 — — 1.0 149.4 8.3 6.0 — — 
Portfolio Company
Fair Value at December 31, 2021
Gross Additions(1)
Gross Reductions(2)
Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation)
Fair Value at September 30, 2022
Interest Income(3)
PIK Income(3)
Fee Income(3)
Dividend and Other Income(3)
 Production Resource Group LLC $0.1 $— $— $— $— $0.1 $— $— $— $— 
 Production Resource Group LLC 64.4 2.8 (0.4)— 0.9 67.7 4.7 1.5 — — 
Production Resource Group LLC20.2 10.8 (0.2)— 0.3 31.1 — — — — 
Warren Resources Inc18.7 0.4 (0.2)— (0.3)18.6 1.8 0.1 — — 
Senior Secured Loans—Second Lien
Amtek Global Technology Pte Ltd— — — (39.1)39.1 — — — — — 
Other Senior Secured Debt
 JW Aluminum Co 81.0 0.1 — — (2.6)78.5 6.0 — — — 
 One Call Care Management Inc 23.5 1.2 — — (3.5)21.2 0.2 1.5 — — 
Subordinated Debt
ATX Networks Corp7.1 3.3 — — 6.2 16.6 2.2 — — — 
Hilding Anders46.6 — — — (46.6)— — — — — 
Hilding Anders— — — — — — — — — — 
Hilding Anders— — — — — — — — — — 
Asset Based Finance
 801 5th Ave, Seattle, Structure Mezzanine 57.2 0.2 — — (0.2)57.2 3.5 1.3 — — 
 801 5th Ave, Seattle, Private Equity 23.1 — — — (8.8)14.3 — — — — 
 Avenue One PropCo, Private Equity — 41.3 — — — 41.3 — — — — 
 Avida Holding AB, Common Stock 52.3 — — — (14.6)37.7 — — — — 
 Kilter Finance, Preferred Stock 36.1 39.8 — — — 75.9 4.8 1.9 — — 
 Kilter Finance, Private Equity 0.5 — — — — 0.5 — — — — 
 KKR Rocket Loans Aggregator LLC, Partnership Interest 1.4 1.6 — — — 3.0 — — — 0.8 
 My Community Homes PropCo 2, Private Equity 33.0 157.0 (105.0)— — 85.0 — — — — 
 Prime St LLC, Private Equity 9.1 — — — (9.1)— — — — — 
 Prime St LLC, Structured Mezzanine 52.4 0.1 — — (4.8)47.7 2.6 2.4 — — 
 Toorak Capital Funding LLC, Membership Interest 1.7 — (1.7)(0.2)0.2 — — — — 0.3 
 Roemanu LLC (FKA Toorak Capital Partners LLC), Private Equity 199.3 78.4 — — (18.0)259.7 — — — 13.7 
 Roemanu LLC (FKA Toorak Capital Partners LLC), Structured Mezzanine 22.0 32.0 (54.0)— — — — 0.6 — — 
Credit Opportunities Partners JV, LLC
Credit Opportunities Partners JV, LLC1,396.2 175.0 — — (105.1)1,466.1 — — — 153.4 
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 — — — — — — — — — — 
 Hilding Anders, Class A Common Stock — — — — — — — — — — 
Portfolio Company
Fair Value at December 31, 2021
Gross Additions(1)
Gross Reductions(2)
Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation)
Fair Value at September 30, 2022
Interest Income(3)
PIK Income(3)
Fee Income(3)
Dividend and Other 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 A 7.1 — — — 3.8 10.9 — — — — 
 HM Dunn Co Inc, Preferred Stock, Series B — — — — — — — — — — 
 JW Aluminum Co, Common Stock — — — — 2.2 2.2 — — — — 
 JW Aluminum Co, Preferred Stock 122.6 17.7 — — (34.9)105.4 0.6 15.2 — — 
 One Call Care Management Inc, Common Stock 2.4 — — — (0.3)2.1 — — — — 
 One Call Care Management Inc, Preferred Stock A 26.1 — — — (3.6)22.5 — — — — 
 One Call Care Management Inc, Preferred Stock B 9.2 — — — (1.5)7.7 — 0.5 — — 
 PRG III LLC, Preferred Stock, Series A PIK17.4 — — — 46.0 63.4 — — — — 
 PRG III LLC, Preferred Stock, Series B PIK— — — — — — — — — — 
 Sound United LLC, Common Stock(4)
77.5 — (17.3)— (60.2)— — — — — 
 Warren Resources Inc, Common Stock 20.4 — — — 4.4 24.8 — — — — 
Total$2,684.1 $579.2 $(203.8)$(42.5)$(215.7)$2,801.3 $37.0 $34.0 $— $168.2 
______________
(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, 2022.
(4)The Company held this investment as of September 30, 2022 but it was not deemed to be an “control” of the portfolio company as of September 30, 2022. Transfers in or out have been presented at amortized cost.
[35] 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).
[36] Position or portion thereof unsettled as of September 30, 2022.
[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 is classified as Level 1 or 2 in the Company's fair value hierarchy (see Note 8).
[39] Security is classified as Level 1 or Level 2 in the Company's fair value hierarchy (see Note 8).
[40] 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).
[41] Security or portion thereof was held within FSK CLO as of December 31, 2021.
[42] Security or portion thereof held within FS KKR MM CLO 1 LLC (see Note 9).
[43] 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, 2021, 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, 2021:
Portfolio CompanyFair Value at December 31, 2020
Gross Additions(1)
Gross Reductions(2)
Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation)Fair Value at December 31, 2021
Interest Income(3)
PIK Income(3)
Fee Income(3)
Dividend Income(3)
Senior Secured Loans—First Lien
 Affordable Care Inc $ $— $— $— $— $— $— $— $0.3 $— 
 Affordable Care Inc — 115.5 (55.9)0.3 — 59.9 2.7 — 1.6 — 
 Belk Inc — 42.6 (2.4)— 9.0 49.2 3.1 0.9 — — 
 Belk Inc — 21.7 — — 0.2 21.9 1.6 — — — 
 Borden (New Dairy Opco) 7.6 10.6 (10.0)0.2 0.6 9.0 0.5 — — — 
 Borden (New Dairy Opco) 16.8 23.4 — — 1.8 42.0 2.7 — — — 
 Borden Dairy Co— — — 1.3 (1.3)— — — — — 
Portfolio CompanyFair Value at December 31, 2020
Gross Additions(1)
Gross Reductions(2)
Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation)Fair Value at December 31, 2021
Interest Income(3)
PIK Income(3)
Fee Income(3)
Dividend Income(3)
 Constellis Holdings LLC $— $14.0 $— $— $1.0 $15.0 $0.9 $— $— $— 
 Fairway Group Holdings Corp — 1.1 (0.7)0.6 (0.3)0.7 0.8 — — — 
 Fairway Group Holdings Corp — — — — — — — — — — 
 HM Dunn Co Inc(5)
0.3 — (0.6)— 0.3 — — — — — 
 HM Dunn Co Inc(5)
0.2 — (0.3)— 0.1 — — — — — 
 Micronics Filtration Holdings Inc 35.5 1.0 — — 14.5 51.0 — 1.0 — — 
 One Call Care Management Inc(5)
4.7 0.6 (4.9)— (0.4)— 0.2 — — — 
 Petroplex Acidizing Inc 4.5 — (0.2)— 5.4 9.7 — — — — 
 Sorenson Communications LLC(4)
— 61.8 (5.1)0.2 3.2 60.1 2.8 — — — 
 Sungard Availability Services Capital Inc(4)
— 5.7 — — 0.3 6.0 0.2 0.1 — — 
 ThermaSys Corp 3.9 0.4 — — (0.8)3.5 — 0.5 — — 
Senior Secured Loans—Second Lien
 Belk Inc — 4.2 — — 2.5 6.7 — — — — 
 Constellis Holdings LLC — 12.5 — — (0.5)12.0 0.6 0.4 — — 
 Fairway Group Holdings Corp — — — — — — — — — — 
 Sorenson Communications LLC — 22.0 (22.2)0.2 — — 0.4 0.9 — — 
 Sungard Availability Services Capital Inc — 13.6 0.1 — (5.4)8.3 0.7 0.2 — — 
Other Senior Secured Debt
JW Aluminum Co(5)
41.8 — (39.4)— (2.4)— — — — — 
Subordinated Debt
 Home Partners of America Inc — 3.5 (3.5)— — — 0.1 — — — 
Asset Based Finance
 Home Partners JV, Structured Mezzanine38.5 83.4 (36.3)— 4.8 90.4 0.6 7.3 — — 
 Home Partners JV, Private Equity — 5.4 — — 4.0 9.4 — — — — 
 Home Partners JV, Private Equity — — — (0.6)0.6 — — — — — 
 Home Partners JV, Common Stock 21.5 45.9 (22.9)7.7 28.4 80.6 — — — — 
 Home Partners JV 2, Structured Mezzanine— 3.4 — — 0.1 3.5 — 0.2 — — 
 Home Partners JV 2, Private Equity — 0.1 — — — 0.1 — — — — 
 Home Partners JV 2, Private Equity — 1.5 — — 0.1 1.6 — — — — 
 Jet Edge International LLC, Preferred Stock — 20.9 — — (4.1)16.8 0.5 — — — 
 Jet Edge International LLC, Warrant — — — — 4.5 4.5 — — — — 
 Jet Edge International LLC, Term Loan — 78.0 (2.1)— (0.3)75.6 2.4 0.5 — — 
 Orchard Marine Limited, Class B Common Stock — — — — — — — — — — 
 Orchard Marine Limited, Series A Preferred Stock 24.6 — — — 40.0 64.6 — — — — 
Equity/Other
 Affordable Care Inc, Common Stock — 48.1 — — 4.0 52.1 — 2.3 — — 
 ASG Technologies, Common Stock 42.7 — (79.4)56.0 (19.3)— — — — — 
 ASG Technologies, Warrants 3.5 — (10.2)3.7 3.0 — — — — — 
 Belk Inc, Common Stock — — — — — — — 0— — 
Portfolio CompanyFair Value at December 31, 2020
Gross Additions(1)
Gross Reductions(2)
Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation)Fair Value at December 31, 2021
Interest Income(3)
PIK Income(3)
Fee Income(3)
Dividend Income(3)
 Borden (New Dairy Opco), Common Stock $3.2 $5.2 $— $— $(0.7)$7.7 $— $— $— $— 
 Charlotte Russe Inc, Common Stock — — — (12.5)12.5 — — — — — 
 Constellis Holdings LLC, Private Equity — 10.3 — — (10.1)0.2 — — — — 
 Fairway Group Holdings Corp, Common Stock — — — — — — — — — — 
 Fronton BV, Common Stock 1.2 — — — 0.2 1.4 — — — — 
 HM Dunn Co Inc, Preferred Stock, Series A(5)
— — — — — — — — — — 
 HM Dunn Co Inc, Preferred Stock, Series B(5)
— — — — — — — — — — 
 Home Partners of America Inc, Common Stock 130.5 — (214.3)130.7 (46.9)— — — — — 
 Home Partners of America Inc, Warrant 2.1 — (4.4)4.1 (1.8)— — — — — 
 JW Aluminum Co, Common Stock(5)
— — — — — — — — — — 
 JW Aluminum Co, Preferred Stock(5)
93.7 — (107.3)— 13.6 — — 4.2 — — 
 Micronics Filtration Holdings Inc, Common Stock — — — — — — — — — — 
 Micronics Filtration Holdings Inc, Preferred Stock, Series A — — — — 0.1 0.1 — — — — 
 Micronics Filtration Holdings Inc, Preferred Stock, Series B — — — — 0.4 0.4 — — — — 
 Micronics Filtration Holdings Inc, Preferred Stock, Series B PIK — — — — 11.9 11.9 — — — — 
 Micronics Filtration Holdings Inc, Preferred Stock, Series C PIK — — — — 6.2 6.2 — — — — 
 One Call Care Management Inc, Common Stock(5)
2.4 — (3.0)— 0.6 — — — — — 
 One Call Care Management Inc, Preferred Stock A(5)
25.5 — (32.3)— 6.8 — — — — — 
 One Call Care Management Inc, Preferred Stock B(5)
10.6 — (9.8)— (0.8)— — — — — 
 Petroplex Acidizing Inc, Preferred Stock A — 0.4 — — (0.4)— — — — 0.4 
 Petroplex Acidizing Inc, Warrant — — — — — — — — — — 
 Proserv Acquisition LLC, Class A Common Units 9.0 — (0.1)— (8.8)0.1 — — — — 
 Proserv Acquisition LLC, Class A Preferred Units 9.5 — — — (0.2)9.3 — — — — 
 Sorenson Communications LLC, Common Stock(4)
— 42.5 — — 25.0 67.5 — — — — 
 Sungard Availability Services Capital Inc, Common Stock(4)— 6.9 — — (6.9)— — — — — 
 ThermaSys Corp, Common Stock — — — — — — — — — — 
 ThermaSys Corp, Preferred Stock — — — — — — — — — — 
Total$533.8 $706.2 $(667.2)$191.9 $94.3 $859.0 $20.8 $18.5 $1.9 $0.4 
______________
(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, 2021.
(4)The Company held this investment as of December 31, 2020 but it was not deemed to be an “affiliated person” of the portfolio company as of December 31, 2020. Transfers in or out have been presented at amortized cost.
(5)The Company held this investment as of December 31, 2021 but it was deemed to "control" the portfolio company as of December 31, 2021. Transfers in or out have been presented at amortized cost.
[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, 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 as of September 30, 2022:
Portfolio Company
Fair Value at December 31, 2021
Gross Additions(1)
Gross Reductions(2)
Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation)
Fair Value at September 30, 2022
Interest Income(3)
PIK Income(3)
Fee Income(3)
Dividend and Other Income(3)
Senior Secured Loans—First Lien
Affordable Care Inc$— $— $— $— $— $— $— $— $— $— 
Affordable Care Inc59.9 10.0 (21.2)— (0.7)48.0 2.7 — 0.2 — 
athenahealth Inc— 6.8 (6.1)(0.7)— — 0.2 — 0.2 — 
Belk Inc49.2 4.5 (1.0)(0.2)(39.6)12.9 3.7 2.7 — — 
Belk Inc21.9 0.1 — — (2.4)19.6 1.5 — — — 
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 — — — — — 
Portfolio Company
Fair Value at December 31, 2021
Gross Additions(1)
Gross Reductions(2)
Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation)
Fair Value at September 30, 2022
Interest Income(3)
PIK Income(3)
Fee Income(3)
Dividend and Other Income(3)
Constellis Holdings LLC$15.0 $0.3 $— $— $(0.3)$15.0 $1.3 $— $— $— 
Fairway Group Holdings Corp0.7 — — (1.0)0.3 — — — — — 
Fairway Group Holdings Corp— — — — — — — — — — 
Micronics Filtration Holdings LLC51.0 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 Inc6.0 0.1 — — (5.6)0.5 — — — — 
Sungard Availability Services Capital Inc— 4.5 — — — 4.5 0.3 0.1 0.2 — 
ThermaSys Corp3.5 — — — 2.2 5.7 — — — — 
Senior Secured Loans—Second Lien
 Belk Inc 6.7 — — — (3.0)3.7 — — — — 
 Constellis Holdings LLC 12.0 0.2 — — 1.3 13.5 1.4 — — — 
 Fairway Group Holdings Corp — — — — — — — — — — 
 Sungard Availability Services Capital Inc 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 Equity 9.4 — (11.8)6.4 (4.0)— — — — 0.7 
 Home Partners JV, Common Stock 80.6 — (101.0)53.4 (33.0)— — — — 4.3 
 Home Partners JV 2, Structured Mezzanine3.5 6.5 — 0.1 (0.1)10.0 — 0.4 — — 
 Home Partners JV 2, Private Equity 0.1 0.1 — — — 0.2 — — — — 
 Home Partners JV 2, Private Equity 1.6 2.9 — — 0.7 5.2 — — — — 
 Jet Edge International LLC, Preferred Stock 16.8 — (30.1)9.2 4.1 — 0.7 — — — 
 Jet Edge International LLC, Warrant 4.5 — (13.3)13.3 (4.5)— — — — 1.5 
 Jet Edge International LLC, Term Loan 75.6 — (75.9)— 0.3 — 9.9 1.9 2.7 — 
 Orchard Marine Limited, Class B Common Stock — — — (3.1)3.1 — — — — — 
 Orchard Marine Limited, Series A Preferred Stock 64.6 — (65.4)3.4 (2.6)— — — — — 
Equity/Other
 Affordable Care Inc, Preferred Stock 52.1 — — — (2.1)50.0 — 4.1 — — 
 athenahealth Inc, Preferred Stock — 311.3 (47.5)(1.6)(33.2)229.0 1.4 20.2 — — 
 Belk Inc, Common Stock — — — — — — — — — — 
 Borden (New Dairy Opco), Common Stock 7.7 — — — (2.8)4.9 — — — — 
 Constellis Holdings LLC, Private Equity 0.2 — — — 5.7 5.9 — — — — 
 Fairway Group Holdings Corp, Common Stock — — — — — — — — — — 
 Fronton BV, Common Stock 1.4 — — — (0.3)1.1 — — — — 
 Micronics Filtration Holdings Inc, Common Stock — — (0.1)(0.5)0.6 — — — — — 
 Micronics Filtration Holdings Inc, Preferred Stock, Series A 0.1 — — (0.6)0.5 — — — — — 
Portfolio Company
Fair Value at December 31, 2021
Gross Additions(1)
Gross Reductions(2)
Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation)
Fair Value at September 30, 2022
Interest Income(3)
PIK Income(3)
Fee Income(3)
Dividend and Other Income(3)
 Micronics Filtration Holdings Inc, Preferred Stock, Series B $0.4 $— $(0.4)$0.2 $(0.2)$— $— $— $— $— 
 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 PIK 6.2 — (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 Units 0.1 0.1 — — 0.3 0.5 — — — — 
 Proserv Acquisition LLC, Class A Preferred Units 9.3 — — — (0.3)9.0 — — — — 
 Sorenson Communications LLC, Common Stock(4)
67.5 — (65.4)22.9 (25.0)— — — — — 
 Sungard Availability Services Capital Inc, Common Stock — — — — — — — — — — 
 ThermaSys Corp, Common Stock — — — — — — — — — — 
 ThermaSys Corp, Preferred Stock — — — — — — — — — — 
Total$859.0 $366.6 $(736.6)$89.8 $(139.6)$439.2 $24.7 $37.2 $4.9 $6.5 
______________
(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, 2022.
(4)The Company held this investment as of September 30, 2022 but it was not deemed to be an “affiliated person” of the portfolio company as of September 30, 2022. Transfers in or out have been presented at amortized cost.
[45] 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).
[46] Security or portion thereof was held within CCT Dublin Funding Limited
[47] Security or portion thereof held within CCT Dublin Funding Limited.
[48] Security held within CCT Holdings II, LLC, a wholly-owned subsidiary of the Company.
[49] Security held within CCT Holdings II, LLC, 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 IC American Energy 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 held within FSIC II Investments, Inc., a wholly-owned subsidiary of the Company.
[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.