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INVESTMENTS - Yields at Amortized Cost and Fair Value (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Schedule of Investments [Line Items]    
Amortized Cost $ 28,566.5 [1] $ 26,374.0 [2]
Fair Value $ 28,692.6 [1] $ 26,719.9 [2]
Subordinated loan    
Schedule of Investments [Line Items]    
Yield on investment, at cost 10.70% 0.00%
Yield on investment, at fair value 10.70% 0.00%
Amortized Cost $ 99.0 $ 0.0
Fair Value $ 99.0 $ 0.0
Equity    
Schedule of Investments [Line Items]    
Yield on investment, at cost 17.20% 16.70%
Yield on investment, at fair value 15.20% 14.80%
Amortized Cost $ 1,701.0 $ 1,701.0
Fair Value $ 1,919.0 $ 1,915.0
Subordinated certificates of the SDLP    
Schedule of Investments [Line Items]    
Yield on investment, at cost 13.00% 12.40%
Yield on investment, at fair value 13.10% 13.20%
Amortized Cost $ 1,048.0 $ 1,263.0
Fair Value $ 1,042.0 $ 1,192.0
[1] As of September 30, 2025, the estimated net unrealized gain for federal tax purposes was approximately $0.3 billion based on a tax cost basis of $28.4 billion. As of September 30, 2025, the estimated aggregate gross unrealized gain for federal income tax purposes was approximately $1.3 billion and the estimated aggregate gross unrealized loss for federal income tax purposes was approximately $1.0 billion.
[2] As of December 31, 2024, the estimated net unrealized gain for federal tax purposes was $0.2 billion based on a tax cost basis of $26.5 billion. As of December 31, 2024, the estimated aggregate gross unrealized gain for federal income tax purposes was $1.7 billion and the estimated aggregate gross unrealized loss for federal income tax purposes was $1.5 billion.