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INVESTMENTS - Yields at Amortized Cost and Fair Value (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Schedule of Investments [Line Items]    
Amortized Cost $ 26,777.5 [1] $ 26,374.0 [2]
Fair Value $ 27,130.3 [1] $ 26,719.9 [2]
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 $ 1,920.0 $ 1,915.0
Subordinated certificates of the SDLP    
Schedule of Investments [Line Items]    
Yield on investment, at cost 12.00% 12.40%
Yield on investment, at fair value 13.20% 13.20%
Amortized Cost $ 1,230.0 $ 1,263.0
Fair Value $ 1,115.0 $ 1,192.0
[1] As of March 31, 2025, the estimated net unrealized gain for federal tax purposes was $0.4 billion based on a tax cost basis of $26.7 billion. As of March 31, 2025, 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 $1.3 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.