v3.26.3
FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Significant Unobservable Inputs Used (Details)
Sep. 30, 2026
USD ($)
Dec. 31, 2025
USD ($)
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Fair Value $ 10,566,935,000 $ 3,120,386,000
Common equity    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Fair Value 6,516,384,000 2,168,096,000
Preferred equity    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Fair Value 1,047,597,000 0
Other equity    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Fair Value 987,596,000 354,399,000
First lien senior secured loans    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Fair Value 1,446,172,000 508,273,000
Senior subordinated loans    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Fair Value 510,064,000 89,618,000
Corporate bonds    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Fair Value 59,122,000 0
Level 3    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Fair Value 9,481,082,000 2,777,482,000
Level 3 | Common equity | Discounted cash flow    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Fair Value 5,055,961,000 2,012,509,000
Level 3 | Common equity | Recent transaction price    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Fair Value 1,460,423,000 155,587,000
Level 3 | Preferred equity | Recent transaction price    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Fair Value 1,047,597,000  
Level 3 | Other equity | Discounted cash flow    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Fair Value 390,937,000 354,399,000
Level 3 | Other equity | Recent transaction price    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Fair Value 596,659,000  
Level 3 | First lien senior secured loans | Recent transaction price    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Fair Value   165,173,000
Level 3 | First lien senior secured loans | Yield analysis    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Fair Value 377,230,000  
Level 3 | First lien senior secured loans | Broker quotes    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Fair Value 12,811,000 196,000
Level 3 | Senior subordinated loans | Discounted cash flow    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Fair Value   54,314,000
Level 3 | Senior subordinated loans | Recent transaction price    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Fair Value 196,000,000 $ 35,304,000
Level 3 | Senior subordinated loans | Yield analysis    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Fair Value 314,064,000  
Level 3 | Corporate bonds | Recent transaction price    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Fair Value $ 29,400,000  
Level 3 | Discount rate | Other equity | Discounted cash flow    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unobservable Input   0.0898
Level 3 | Discount rate | Senior subordinated loans | Discounted cash flow    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unobservable Input   0.0991
Level 3 | Discount rate | Minimum | Common equity | Discounted cash flow    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unobservable Input 0.0865 0.0936
Level 3 | Discount rate | Minimum | Other equity | Discounted cash flow    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unobservable Input 0.0915  
Level 3 | Discount rate | Maximum | Common equity | Discounted cash flow    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unobservable Input 0.1097 0.0977
Level 3 | Discount rate | Maximum | Other equity | Discounted cash flow    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unobservable Input 0.1125  
Level 3 | Discount rate | Weighted Average | Discounted cash flow    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unobservable Input   0.0957
Level 3 | Discount rate | Weighted Average | Common equity | Discounted cash flow    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unobservable Input 0.0942  
Level 3 | Discount rate | Weighted Average | Other equity | Discounted cash flow    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unobservable Input 0.0936 0.0898
Level 3 | Discount rate | Weighted Average | Senior subordinated loans | Discounted cash flow    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unobservable Input   0.0991
Level 3 | Market yield | Minimum | First lien senior secured loans | Yield analysis    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unobservable Input 0.0652  
Level 3 | Market yield | Minimum | Senior subordinated loans | Yield analysis    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unobservable Input 0.0903  
Level 3 | Market yield | Maximum | First lien senior secured loans | Yield analysis    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unobservable Input 0.0971  
Level 3 | Market yield | Maximum | Senior subordinated loans | Yield analysis    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unobservable Input 0.0950  
Level 3 | Market yield | Weighted Average | First lien senior secured loans | Yield analysis    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unobservable Input 0.0798  
Level 3 | Market yield | Weighted Average | Senior subordinated loans | Yield analysis    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unobservable Input 0.0931