v3.26.3
Fair Value of Financial Instruments - Schedule of Quantitative Information About Significant Unobservable Inputs of Level 3 Investments (Details)
$ in Thousands
Sep. 30, 2026
USD ($)
Dec. 31, 2025
USD ($)
Discounted Cash Flow Analysis    
Fair Value $ 14,814,824 $ 14,286,039
First-lien senior secured debt investments    
Discounted Cash Flow Analysis    
Fair Value 11,555,643 10,979,070
Second-lien senior secured debt investments    
Discounted Cash Flow Analysis    
Fair Value 502,234 568,641
Unsecured debt investments    
Discounted Cash Flow Analysis    
Fair Value 478,830 477,128
Specialty finance debt investments    
Discounted Cash Flow Analysis    
Fair Value 42,568 37,452
Preferred equity investments    
Discounted Cash Flow Analysis    
Fair Value 990,315 1,072,481
Common equity investments    
Discounted Cash Flow Analysis    
Fair Value 688,504 722,100
Specialty finance equity investments    
Discounted Cash Flow Analysis    
Fair Value 504,789 375,812
Level 3    
Discounted Cash Flow Analysis    
Fair Value 13,845,101 13,590,644
Level 3 | First-lien senior secured debt investments    
Discounted Cash Flow Analysis    
Fair Value 11,281,471 10,660,972
Level 3 | First-lien senior secured debt investments | Recovery Analysis    
Discounted Cash Flow Analysis    
Fair Value 11,109,847 9,346,910
Level 3 | First-lien senior secured debt investments | Transaction    
Discounted Cash Flow Analysis    
Fair Value 78,221 1,280,482
Level 3 | First-lien senior secured debt investments | Yield Analysis    
Discounted Cash Flow Analysis    
Fair Value 93,403 33,580
Level 3 | Second-lien senior secured debt investments    
Discounted Cash Flow Analysis    
Fair Value 390,952 442,717
Level 3 | Second-lien senior secured debt investments | Recovery Analysis    
Discounted Cash Flow Analysis    
Fair Value 390,952 442,717
Level 3 | Second-lien senior secured debt investments | Market Approach    
Discounted Cash Flow Analysis    
Fair Value 4,888  
Level 3 | Unsecured debt investments    
Discounted Cash Flow Analysis    
Fair Value 478,830 477,128
Level 3 | Unsecured debt investments | Recovery Analysis    
Discounted Cash Flow Analysis    
Fair Value 473,942 473,340
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 42,568 37,452
Level 3 | Specialty finance debt investments | Recovery Analysis    
Discounted Cash Flow Analysis    
Fair Value   37,452
Level 3 | Specialty finance debt investments | Recovery Analysis | Market Yield    
Discounted Cash Flow Analysis    
Fair Value 42,568  
Level 3 | Preferred equity investments    
Discounted Cash Flow Analysis    
Fair Value 990,315 1,072,481
Level 3 | Preferred equity investments | Recovery Analysis    
Discounted Cash Flow Analysis    
Fair Value 376,340 451,265
Level 3 | Preferred equity investments | Transaction    
Discounted Cash Flow Analysis    
Fair Value   122,829
Level 3 | Preferred equity investments | Yield Analysis    
Discounted Cash Flow Analysis    
Fair Value 25,517  
Level 3 | Preferred equity investments | Market Approach    
Discounted Cash Flow Analysis    
Fair Value 425,676  
Level 3 | Preferred equity investments | Market Approach | Revenue Multiple    
Discounted Cash Flow Analysis    
Fair Value 39,855 498,387
Level 3 | Preferred equity investments | Market Approach | Market Yield    
Discounted Cash Flow Analysis    
Fair Value 122,927  
Level 3 | Common equity investments    
Discounted Cash Flow Analysis    
Fair Value 490,196 684,030
Level 3 | Common equity investments | Recovery Analysis | Market Yield    
Discounted Cash Flow Analysis    
Fair Value   61,131
Level 3 | Common equity investments | Transaction    
Discounted Cash Flow Analysis    
Fair Value 273,930 421,309
Level 3 | Common equity investments | Yield Analysis | Recovery Rate    
Discounted Cash Flow Analysis    
Fair Value 8,358  
Level 3 | Common equity investments | Market Approach    
Discounted Cash Flow Analysis    
Fair Value 87,245 214
Level 3 | Common equity investments | Market Approach | Revenue Multiple    
Discounted Cash Flow Analysis    
Fair Value 107,640  
Level 3 | Common equity investments | Market Approach | Recovery Rate    
Discounted Cash Flow Analysis    
Fair Value   110,029
Level 3 | Common equity investments | Market Approach | Market Yield    
Discounted Cash Flow Analysis    
Fair Value 263  
Level 3 | Common equity investments | Market Approach | Gross Profit Multiple    
Discounted Cash Flow Analysis    
Fair Value   8,330
Level 3 | Common equity investments | Market Approach | Volatility    
Discounted Cash Flow Analysis    
Fair Value   82,784
Level 3 | Common equity investments | Option Pricing Model | Volatility    
Discounted Cash Flow Analysis    
Fair Value   233
Level 3 | Common equity investments | Discounted Cash Flow Analysis | Market Yield    
Discounted Cash Flow Analysis    
Fair Value 12,760  
Level 3 | Specialty finance equity investments    
Discounted Cash Flow Analysis    
Fair Value 170,769 215,864
Level 3 | Specialty finance equity investments | Recovery Analysis    
Discounted Cash Flow Analysis    
Fair Value   6,657
Level 3 | Specialty finance equity investments | Recovery Analysis | Market Yield    
Discounted Cash Flow Analysis    
Fair Value 5,628  
Level 3 | Specialty finance equity investments | Market Approach    
Discounted Cash Flow Analysis    
Fair Value   22,602
Level 3 | Specialty finance equity investments | Market Approach | Gross Profit Multiple    
Discounted Cash Flow Analysis    
Fair Value 139,904 184,468
Level 3 | Specialty finance equity investments | Market Approach | Volatility    
Discounted Cash Flow Analysis    
Fair Value 23,080  
Level 3 | Specialty finance equity investments | Discounted Cash Flow Analysis    
Discounted Cash Flow Analysis    
Fair Value $ 2,157  
Level 3 | Specialty finance equity investments | Discounted Cash Flow Analysis | Discounted Factor    
Discounted Cash Flow Analysis    
Fair Value   $ 2,137
Level 3 | Minimum | First-lien senior secured debt investments | Recovery Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.069 0.060
Level 3 | Minimum | First-lien senior secured debt investments | Transaction    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.978 0.950
Level 3 | Minimum | First-lien senior secured debt investments | Yield Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.000 0.000
Level 3 | Minimum | Second-lien senior secured debt investments | Recovery Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.104 0.084
Level 3 | Minimum | Second-lien senior secured debt investments | Market Approach    
Discounted Cash Flow Analysis    
Range (Weighted Average) 3.0  
Level 3 | Minimum | Unsecured debt investments | Recovery Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.055 0.055
Level 3 | Minimum | Unsecured debt investments | Recovery Analysis | Revenue Multiple    
Discounted Cash Flow Analysis    
Range (Weighted Average)   4.3
Level 3 | Minimum | Specialty finance debt investments | Recovery Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average)   0.116
Level 3 | Minimum | Specialty finance debt investments | Recovery Analysis | Market Yield    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.127  
Level 3 | Minimum | Preferred equity investments | Recovery Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.135 0.116
Level 3 | Minimum | Preferred equity investments | Transaction    
Discounted Cash Flow Analysis    
Range (Weighted Average)   0.628
Level 3 | Minimum | Preferred equity investments | Yield Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.228  
Level 3 | Minimum | Preferred equity investments | Market Approach    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.6  
Level 3 | Minimum | Preferred equity investments | Market Approach | Revenue Multiple    
Discounted Cash Flow Analysis    
Range (Weighted Average) 12.8 2.0
Level 3 | Minimum | Preferred equity investments | Market Approach | Market Yield    
Discounted Cash Flow Analysis    
Range (Weighted Average) 2.6  
Level 3 | Minimum | Common equity investments | Recovery Analysis | Market Yield    
Discounted Cash Flow Analysis    
Range (Weighted Average)   0.275
Level 3 | Minimum | Common equity investments | Transaction    
Discounted Cash Flow Analysis    
Range (Weighted Average) 1.000 0.542
Level 3 | Minimum | Common equity investments | Yield Analysis | Recovery Rate    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.084  
Level 3 | Minimum | Common equity investments | Market Approach    
Discounted Cash Flow Analysis    
Range (Weighted Average) 5.5 9.0
Level 3 | Minimum | Common equity investments | Market Approach | Revenue Multiple    
Discounted Cash Flow Analysis    
Range (Weighted Average) 2.5  
Level 3 | Minimum | Common equity investments | Market Approach | Recovery Rate    
Discounted Cash Flow Analysis    
Range (Weighted Average)   0.0
Level 3 | Minimum | Common equity investments | Market Approach | Market Yield    
Discounted Cash Flow Analysis    
Range (Weighted Average) 10.0  
Level 3 | Minimum | Common equity investments | Market Approach | Gross Profit Multiple    
Discounted Cash Flow Analysis    
Range (Weighted Average)   0.000
Level 3 | Minimum | Common equity investments | Market Approach | Volatility    
Discounted Cash Flow Analysis    
Range (Weighted Average)   4.3
Level 3 | Minimum | Common equity investments | Option Pricing Model | Volatility    
Discounted Cash Flow Analysis    
Range (Weighted Average)   0.600
Level 3 | Minimum | Common equity investments | Discounted Cash Flow Analysis | Market Yield    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.086  
Level 3 | Minimum | Specialty finance equity investments | Recovery Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average)   0.115
Level 3 | Minimum | Specialty finance equity investments | Recovery Analysis | Market Yield    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.121  
Level 3 | Minimum | Specialty finance equity investments | Market Approach | Gross Profit Multiple    
Discounted Cash Flow Analysis    
Range (Weighted Average) 1.0 1.1
Level 3 | Minimum | Specialty finance equity investments | Market Approach | Volatility    
Discounted Cash Flow Analysis    
Range (Weighted Average) 1.113  
Level 3 | Minimum | Specialty finance equity investments | Discounted Cash Flow Analysis | Market Yield    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.200  
Level 3 | Minimum | Specialty finance equity investments | Discounted Cash Flow Analysis | Discounted Factor    
Discounted Cash Flow Analysis    
Range (Weighted Average)   0.200
Level 3 | Maximum | First-lien senior secured debt investments | Recovery Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.365 0.236
Level 3 | Maximum | First-lien senior secured debt investments | Transaction    
Discounted Cash Flow Analysis    
Range (Weighted Average) 1.000 1.000
Level 3 | Maximum | First-lien senior secured debt investments | Yield Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.883 1.072
Level 3 | Maximum | Second-lien senior secured debt investments | Recovery Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.787 0.325
Level 3 | Maximum | Second-lien senior secured debt investments | Market Approach    
Discounted Cash Flow Analysis    
Range (Weighted Average) 3.0  
Level 3 | Maximum | Unsecured debt investments | Recovery Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.187 0.149
Level 3 | Maximum | Unsecured debt investments | Recovery Analysis | Revenue Multiple    
Discounted Cash Flow Analysis    
Range (Weighted Average)   5.0
Level 3 | Maximum | Specialty finance debt investments | Recovery Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average)   0.116
Level 3 | Maximum | Specialty finance debt investments | Recovery Analysis | Market Yield    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.127  
Level 3 | Maximum | Preferred equity investments | Recovery Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.600 0.353
Level 3 | Maximum | Preferred equity investments | Transaction    
Discounted Cash Flow Analysis    
Range (Weighted Average)   1.000
Level 3 | Maximum | Preferred equity investments | Yield Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.730  
Level 3 | Maximum | Preferred equity investments | Market Approach    
Discounted Cash Flow Analysis    
Range (Weighted Average) 40.0  
Level 3 | Maximum | Preferred equity investments | Market Approach | Revenue Multiple    
Discounted Cash Flow Analysis    
Range (Weighted Average) 12.8 25.2
Level 3 | Maximum | Preferred equity investments | Market Approach | Market Yield    
Discounted Cash Flow Analysis    
Range (Weighted Average) 2.6  
Level 3 | Maximum | Common equity investments | Recovery Analysis | Market Yield    
Discounted Cash Flow Analysis    
Range (Weighted Average)   0.275
Level 3 | Maximum | Common equity investments | Transaction    
Discounted Cash Flow Analysis    
Range (Weighted Average) 3.438 8.137
Level 3 | Maximum | Common equity investments | Yield Analysis | Recovery Rate    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.084  
Level 3 | Maximum | Common equity investments | Market Approach    
Discounted Cash Flow Analysis    
Range (Weighted Average) 27.8 9.0
Level 3 | Maximum | Common equity investments | Market Approach | Revenue Multiple    
Discounted Cash Flow Analysis    
Range (Weighted Average) 47.5  
Level 3 | Maximum | Common equity investments | Market Approach | Recovery Rate    
Discounted Cash Flow Analysis    
Range (Weighted Average)   25.5
Level 3 | Maximum | Common equity investments | Market Approach | Market Yield    
Discounted Cash Flow Analysis    
Range (Weighted Average) 10.0  
Level 3 | Maximum | Common equity investments | Market Approach | Gross Profit Multiple    
Discounted Cash Flow Analysis    
Range (Weighted Average)   0.000
Level 3 | Maximum | Common equity investments | Market Approach | Volatility    
Discounted Cash Flow Analysis    
Range (Weighted Average)   13.0
Level 3 | Maximum | Common equity investments | Option Pricing Model | Volatility    
Discounted Cash Flow Analysis    
Range (Weighted Average)   0.700
Level 3 | Maximum | Common equity investments | Discounted Cash Flow Analysis | Market Yield    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.121  
Level 3 | Maximum | Specialty finance equity investments | Recovery Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average)   0.115
Level 3 | Maximum | Specialty finance equity investments | Recovery Analysis | Market Yield    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.121  
Level 3 | Maximum | Specialty finance equity investments | Market Approach | Gross Profit Multiple    
Discounted Cash Flow Analysis    
Range (Weighted Average) 1.0 1.1
Level 3 | Maximum | Specialty finance equity investments | Market Approach | Volatility    
Discounted Cash Flow Analysis    
Range (Weighted Average) 1.518  
Level 3 | Maximum | Specialty finance equity investments | Discounted Cash Flow Analysis | Market Yield    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.200  
Level 3 | Maximum | Specialty finance equity investments | Discounted Cash Flow Analysis | Discounted Factor    
Discounted Cash Flow Analysis    
Range (Weighted Average)   0.200
Level 3 | Weighted Average | First-lien senior secured debt investments | Recovery Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.108 0.094
Level 3 | Weighted Average | First-lien senior secured debt investments | Transaction    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.980 0.994
Level 3 | Weighted Average | First-lien senior secured debt investments | Yield Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.839 0.840
Level 3 | Weighted Average | Second-lien senior secured debt investments | Recovery Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.221 0.144
Level 3 | Weighted Average | Second-lien senior secured debt investments | Market Approach    
Discounted Cash Flow Analysis    
Range (Weighted Average) 3.0  
Level 3 | Weighted Average | Unsecured debt investments | Recovery Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.129 0.119
Level 3 | Weighted Average | Unsecured debt investments | Recovery Analysis | Revenue Multiple    
Discounted Cash Flow Analysis    
Range (Weighted Average)   4.8
Level 3 | Weighted Average | Specialty finance debt investments | Recovery Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average)   0.116
Level 3 | Weighted Average | Specialty finance debt investments | Recovery Analysis | Market Yield    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.127  
Level 3 | Weighted Average | Preferred equity investments | Recovery Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.193 0.140
Level 3 | Weighted Average | Preferred equity investments | Transaction    
Discounted Cash Flow Analysis    
Range (Weighted Average)   0.865
Level 3 | Weighted Average | Preferred equity investments | Yield Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.418  
Level 3 | Weighted Average | Preferred equity investments | Market Approach    
Discounted Cash Flow Analysis    
Range (Weighted Average) 9.5  
Level 3 | Weighted Average | Preferred equity investments | Market Approach | Revenue Multiple    
Discounted Cash Flow Analysis    
Range (Weighted Average) 12.8 7.3
Level 3 | Weighted Average | Preferred equity investments | Market Approach | Market Yield    
Discounted Cash Flow Analysis    
Range (Weighted Average) 2.6  
Level 3 | Weighted Average | Common equity investments | Recovery Analysis | Market Yield    
Discounted Cash Flow Analysis    
Range (Weighted Average)   0.275
Level 3 | Weighted Average | Common equity investments | Transaction    
Discounted Cash Flow Analysis    
Range (Weighted Average) 3.296 4.443
Level 3 | Weighted Average | Common equity investments | Yield Analysis | Recovery Rate    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.084  
Level 3 | Weighted Average | Common equity investments | Market Approach    
Discounted Cash Flow Analysis    
Range (Weighted Average) 14.3 9.0
Level 3 | Weighted Average | Common equity investments | Market Approach | Revenue Multiple    
Discounted Cash Flow Analysis    
Range (Weighted Average) 8.5  
Level 3 | Weighted Average | Common equity investments | Market Approach | Recovery Rate    
Discounted Cash Flow Analysis    
Range (Weighted Average)   11.9
Level 3 | Weighted Average | Common equity investments | Market Approach | Market Yield    
Discounted Cash Flow Analysis    
Range (Weighted Average) 10.0  
Level 3 | Weighted Average | Common equity investments | Market Approach | Gross Profit Multiple    
Discounted Cash Flow Analysis    
Range (Weighted Average)   0.000
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 | Option Pricing Model | Volatility    
Discounted Cash Flow Analysis    
Range (Weighted Average)   0.699
Level 3 | Weighted Average | Common equity investments | Discounted Cash Flow Analysis | Market Yield    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.104  
Level 3 | Weighted Average | Specialty finance equity investments | Recovery Analysis    
Discounted Cash Flow Analysis    
Range (Weighted Average)   0.115
Level 3 | Weighted Average | Specialty finance equity investments | Recovery Analysis | Market Yield    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.121  
Level 3 | Weighted Average | Specialty finance equity investments | Market Approach | Gross Profit Multiple    
Discounted Cash Flow Analysis    
Range (Weighted Average) 1.0 1.1
Level 3 | Weighted Average | Specialty finance equity investments | Market Approach | Volatility    
Discounted Cash Flow Analysis    
Range (Weighted Average) 1.370  
Level 3 | Weighted Average | Specialty finance equity investments | Discounted Cash Flow Analysis | Market Yield    
Discounted Cash Flow Analysis    
Range (Weighted Average) 0.200  
Level 3 | Weighted Average | Specialty finance equity investments | Discounted Cash Flow Analysis | Discounted Factor    
Discounted Cash Flow Analysis    
Range (Weighted Average)   0.200