v3.26.1
Fair Value of Financial Instruments - Schedule of Quantitative Information About Significant Unobservable Inputs of Level 3 Investments (Details)
$ in Thousands
Mar. 31, 2026
USD ($)
Dec. 31, 2025
USD ($)
Discounted Cash Flow Analysis    
Fair Value $ 14,068,239 $ 14,286,039
First-lien senior secured debt investments    
Discounted Cash Flow Analysis    
Fair Value 10,917,188 10,979,070
Second-lien senior secured debt investments    
Discounted Cash Flow Analysis    
Fair Value 498,121 568,641
Unsecured debt investments    
Discounted Cash Flow Analysis    
Fair Value 456,403 477,128
Specialty finance debt investments    
Discounted Cash Flow Analysis    
Fair Value 38,000 37,452
Preferred equity investments    
Discounted Cash Flow Analysis    
Fair Value 982,150 1,072,481
Common equity investments    
Discounted Cash Flow Analysis    
Fair Value 615,910 722,100
Specialty finance equity investments    
Discounted Cash Flow Analysis    
Fair Value 527,414 375,812
Level 3    
Discounted Cash Flow Analysis    
Fair Value 13,205,096 13,590,644
Level 3 | First-lien senior secured debt investments    
Discounted Cash Flow Analysis    
Fair Value 10,616,855 10,660,972
Level 3 | First-lien senior secured debt investments | Recent Transaction    
Discounted Cash Flow Analysis    
Fair Value 589,666 1,280,482
Level 3 | First-lien senior secured debt investments | Yield Analysis    
Discounted Cash Flow Analysis    
Fair Value 10,008,854 9,346,910
Level 3 | First-lien senior secured debt investments | Collateral Analysis    
Discounted Cash Flow Analysis    
Fair Value 18,335 33,580
Level 3 | Second-lien senior secured debt investments    
Discounted Cash Flow Analysis    
Fair Value 377,601 442,717
Level 3 | Second-lien senior secured debt investments | Yield Analysis    
Discounted Cash Flow Analysis    
Fair Value 377,601 442,717
Level 3 | Unsecured debt investments    
Discounted Cash Flow Analysis    
Fair Value 456,403 477,128
Level 3 | Unsecured debt investments | Yield Analysis    
Discounted Cash Flow Analysis    
Fair Value 451,682 473,340
Level 3 | Unsecured debt investments | Market Approach    
Discounted Cash Flow Analysis    
Fair Value 4,721  
Level 3 | Unsecured debt investments | Market Approach | Revenue Multiple    
Discounted Cash Flow Analysis    
Fair Value   3,788
Level 3 | Specialty finance debt investments    
Discounted Cash Flow Analysis    
Fair Value 38,000 37,452
Level 3 | Specialty finance debt investments | Yield Analysis    
Discounted Cash Flow Analysis    
Fair Value 38,000 37,452
Level 3 | Preferred equity investments    
Discounted Cash Flow Analysis    
Fair Value 982,150 1,072,481
Level 3 | Preferred equity investments | Recent Transaction    
Discounted Cash Flow Analysis    
Fair Value 42,598 122,829
Level 3 | Preferred equity investments | Yield Analysis    
Discounted Cash Flow Analysis    
Fair Value 430,431 451,265
Level 3 | Preferred equity investments | Market Approach | Revenue Multiple    
Discounted Cash Flow Analysis    
Fair Value 509,121 498,387
Level 3 | Common equity investments    
Discounted Cash Flow Analysis    
Fair Value 564,590 684,030
Level 3 | Common equity investments | Recent Transaction    
Discounted Cash Flow Analysis    
Fair Value 339,105 421,309
Level 3 | Common equity investments | Yield Analysis    
Discounted Cash Flow Analysis    
Fair Value 30,372  
Level 3 | Common equity investments | Yield Analysis | Market Yield    
Discounted Cash Flow Analysis    
Fair Value   61,131
Level 3 | Common equity investments | Market Approach    
Discounted Cash Flow Analysis    
Fair Value   214
Level 3 | Common equity investments | Market Approach | Revenue Multiple    
Discounted Cash Flow Analysis    
Fair Value 92,868  
Level 3 | Common equity investments | Market Approach | EBITDA Multiple    
Discounted Cash Flow Analysis    
Fair Value 92,307 110,029
Level 3 | Common equity investments | Market Approach | Market Yield    
Discounted Cash Flow Analysis    
Fair Value 141  
Level 3 | Common equity investments | Market Approach | Volatility    
Discounted Cash Flow Analysis    
Fair Value   82,784
Level 3 | Common equity investments | Market Approach | Market Adjustment Factor    
Discounted Cash Flow Analysis    
Fair Value 9,504 8,330
Level 3 | Common equity investments | Option Pricing Model    
Discounted Cash Flow Analysis    
Fair Value   233
Level 3 | Common equity investments | Option Pricing Model | Volatility    
Discounted Cash Flow Analysis    
Fair Value 293  
Level 3 | Specialty finance equity investments    
Discounted Cash Flow Analysis    
Fair Value 169,497 215,864
Level 3 | Specialty finance equity investments | Yield Analysis    
Discounted Cash Flow Analysis    
Fair Value   6,657
Level 3 | Specialty finance equity investments | Yield Analysis | Volatility    
Discounted Cash Flow Analysis    
Fair Value 6,757  
Level 3 | Specialty finance equity investments | Market Approach    
Discounted Cash Flow Analysis    
Fair Value 22,061 22,602
Level 3 | Specialty finance equity investments | Market Approach | Market Adjustment Factor    
Discounted Cash Flow Analysis    
Fair Value 138,710 184,468
Level 3 | Specialty finance equity investments | Discounted Cash Flow Analysis | Discounted Factor    
Discounted Cash Flow Analysis    
Fair Value $ 1,969 $ 2,137
Level 3 | Minimum | First-lien senior secured debt investments | Recent Transaction    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.985 0.950
Level 3 | Minimum | First-lien senior secured debt investments | Yield Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.074 0.060
Level 3 | Minimum | First-lien senior secured debt investments | Collateral Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.030 0.000
Level 3 | Minimum | Second-lien senior secured debt investments | Yield Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.110 0.084
Level 3 | Minimum | Unsecured debt investments | Yield Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.056 0.055
Level 3 | Minimum | Unsecured debt investments | Yield Analysis | Revenue Multiple    
Discounted Cash Flow Analysis    
Range (Weighted Average)   4.3
Level 3 | Minimum | Unsecured debt investments | Market Approach    
Discounted Cash Flow Analysis    
Range (Weighted Average) 3.0  
Level 3 | Minimum | Specialty finance debt investments | Yield Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.122 0.116
Level 3 | Minimum | Preferred equity investments | Recent Transaction    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.900 0.628
Level 3 | Minimum | Preferred equity investments | Yield Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.128 0.116
Level 3 | Minimum | Preferred equity investments | Market Approach | Revenue Multiple    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.6 2.0
Level 3 | Minimum | Common equity investments | Recent Transaction    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.942 0.542
Level 3 | Minimum | Common equity investments | Yield Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.325  
Level 3 | Minimum | Common equity investments | Yield Analysis | Market Yield    
Discounted Cash Flow Analysis    
Range (Weighted Average)   0.275
Level 3 | Minimum | Common equity investments | Market Approach    
Discounted Cash Flow Analysis    
Range (Weighted Average)   9.0
Level 3 | Minimum | Common equity investments | Market Approach | Revenue Multiple    
Discounted Cash Flow Analysis    
Range (Weighted Average) 3  
Level 3 | Minimum | Common equity investments | Market Approach | EBITDA Multiple    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.0 0.0
Level 3 | Minimum | Common equity investments | Market Approach | Market Yield    
Discounted Cash Flow Analysis    
Range (Weighted Average) 7.0  
Level 3 | Minimum | Common equity investments | Market Approach | Volatility    
Discounted Cash Flow Analysis    
Range (Weighted Average)   4.25
Level 3 | Minimum | Common equity investments | Market Approach | Market Adjustment Factor    
Discounted Cash Flow Analysis    
Range (Weighted Average)   0.000
Range (Weighted Average) (0.032)  
Level 3 | Minimum | Common equity investments | Option Pricing Model    
Discounted Cash Flow Analysis    
Range (Weighted Average)   0.600
Level 3 | Minimum | Common equity investments | Option Pricing Model | Volatility    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.600  
Level 3 | Minimum | Specialty finance equity investments | Yield Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.118 0.115
Level 3 | Minimum | Specialty finance equity investments | Market Approach | Market Adjustment Factor    
Discounted Cash Flow Analysis    
Range (Weighted Average) 1.0 1.1
Level 3 | Minimum | Specialty finance equity investments | Discounted Cash Flow Analysis | Discounted Factor    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.200 0.200
Level 3 | Maximum | First-lien senior secured debt investments | Recent Transaction    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.998 1.000
Level 3 | Maximum | First-lien senior secured debt investments | Yield Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.272 0.236
Level 3 | Maximum | First-lien senior secured debt investments | Collateral Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 1.000 1.072
Level 3 | Maximum | Second-lien senior secured debt investments | Yield Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.323 0.325
Level 3 | Maximum | Unsecured debt investments | Yield Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.175 0.149
Level 3 | Maximum | Unsecured debt investments | Yield Analysis | Revenue Multiple    
Discounted Cash Flow Analysis    
Range (Weighted Average)   5.0
Level 3 | Maximum | Unsecured debt investments | Market Approach    
Discounted Cash Flow Analysis    
Range (Weighted Average) 3.8  
Level 3 | Maximum | Specialty finance debt investments | Yield Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.122 0.116
Level 3 | Maximum | Preferred equity investments | Recent Transaction    
Discounted Cash Flow Analysis    
Range (Weighted Average) 2.899 1.000
Level 3 | Maximum | Preferred equity investments | Yield Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.436 0.353
Level 3 | Maximum | Preferred equity investments | Market Approach | Revenue Multiple    
Discounted Cash Flow Analysis    
Range (Weighted Average) 21.0 25.2
Level 3 | Maximum | Common equity investments | Recent Transaction    
Discounted Cash Flow Analysis    
Range (Weighted Average) 12.535 8.137
Level 3 | Maximum | Common equity investments | Yield Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.325  
Level 3 | Maximum | Common equity investments | Yield Analysis | Market Yield    
Discounted Cash Flow Analysis    
Range (Weighted Average)   0.275
Level 3 | Maximum | Common equity investments | Market Approach    
Discounted Cash Flow Analysis    
Range (Weighted Average)   9.0
Level 3 | Maximum | Common equity investments | Market Approach | Revenue Multiple    
Discounted Cash Flow Analysis    
Range (Weighted Average) 47.0  
Level 3 | Maximum | Common equity investments | Market Approach | EBITDA Multiple    
Discounted Cash Flow Analysis    
Range (Weighted Average) 21.5 25.5
Level 3 | Maximum | Common equity investments | Market Approach | Market Yield    
Discounted Cash Flow Analysis    
Range (Weighted Average) 7.0  
Level 3 | Maximum | Common equity investments | Market Approach | Volatility    
Discounted Cash Flow Analysis    
Range (Weighted Average)   13.0
Level 3 | Maximum | Common equity investments | Market Approach | Market Adjustment Factor    
Discounted Cash Flow Analysis    
Range (Weighted Average)   0.000
Range (Weighted Average) (0.032)  
Level 3 | Maximum | Common equity investments | Option Pricing Model    
Discounted Cash Flow Analysis    
Range (Weighted Average)   0.700
Level 3 | Maximum | Common equity investments | Option Pricing Model | Volatility    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.700  
Level 3 | Maximum | Specialty finance equity investments | Yield Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.118 0.115
Level 3 | Maximum | Specialty finance equity investments | Market Approach | Market Adjustment Factor    
Discounted Cash Flow Analysis    
Range (Weighted Average) 1.0 1.1
Level 3 | Maximum | Specialty finance equity investments | Discounted Cash Flow Analysis | Discounted Factor    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.200 0.200
Level 3 | Weighted Average | First-lien senior secured debt investments | Recent Transaction    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.996 0.994
Level 3 | Weighted Average | First-lien senior secured debt investments | Yield Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.102 0.094
Level 3 | Weighted Average | First-lien senior secured debt investments | Collateral Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.527 0.840
Level 3 | Weighted Average | Second-lien senior secured debt investments | Yield Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.161 0.144
Level 3 | Weighted Average | Unsecured debt investments | Yield Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.126 0.119
Level 3 | Weighted Average | Unsecured debt investments | Yield Analysis | Revenue Multiple    
Discounted Cash Flow Analysis    
Range (Weighted Average)   4.8
Level 3 | Weighted Average | Unsecured debt investments | Market Approach    
Discounted Cash Flow Analysis    
Range (Weighted Average) 3.6  
Level 3 | Weighted Average | Specialty finance debt investments | Yield Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.122 0.116
Level 3 | Weighted Average | Preferred equity investments | Recent Transaction    
Discounted Cash Flow Analysis    
Range (Weighted Average) 1.658 0.865
Level 3 | Weighted Average | Preferred equity investments | Yield Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.177 0.140
Level 3 | Weighted Average | Preferred equity investments | Market Approach | Revenue Multiple    
Discounted Cash Flow Analysis    
Range (Weighted Average) 6.8 7.3
Level 3 | Weighted Average | Common equity investments | Recent Transaction    
Discounted Cash Flow Analysis    
Range (Weighted Average) 5.939 4.443
Level 3 | Weighted Average | Common equity investments | Yield Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.325  
Level 3 | Weighted Average | Common equity investments | Yield Analysis | Market Yield    
Discounted Cash Flow Analysis    
Range (Weighted Average)   0.275
Level 3 | Weighted Average | Common equity investments | Market Approach    
Discounted Cash Flow Analysis    
Range (Weighted Average)   9.0
Level 3 | Weighted Average | Common equity investments | Market Approach | Revenue Multiple    
Discounted Cash Flow Analysis    
Range (Weighted Average) 7.8  
Level 3 | Weighted Average | Common equity investments | Market Approach | EBITDA Multiple    
Discounted Cash Flow Analysis    
Range (Weighted Average) 10.9 11.9
Level 3 | Weighted Average | Common equity investments | Market Approach | Market Yield    
Discounted Cash Flow Analysis    
Range (Weighted Average) 7.0  
Level 3 | Weighted Average | Common equity investments | Market Approach | Volatility    
Discounted Cash Flow Analysis    
Range (Weighted Average)   10.1
Level 3 | Weighted Average | Common equity investments | Market Approach | Market Adjustment Factor    
Discounted Cash Flow Analysis    
Range (Weighted Average)   0.000
Range (Weighted Average) (0.032)  
Level 3 | Weighted Average | Common equity investments | Option Pricing Model    
Discounted Cash Flow Analysis    
Range (Weighted Average)   0.699
Level 3 | Weighted Average | Common equity investments | Option Pricing Model | Volatility    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.699  
Level 3 | Weighted Average | Specialty finance equity investments | Yield Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.118 0.115
Level 3 | Weighted Average | Specialty finance equity investments | Market Approach | Market Adjustment Factor    
Discounted Cash Flow Analysis    
Range (Weighted Average) 1.0 1.1
Level 3 | Weighted Average | Specialty finance equity investments | Discounted Cash Flow Analysis | Discounted Factor    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.200 0.200