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INVESTMENTS - Amortized Cost and Fair Value of the Investment in IHAM (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]    
Amortized Cost $ 22,667.6 [1] $ 22,043.0 [2]
Fair Value 22,873.7 [1] 21,779.8 [2]
Ivy Hill Asset Management, L.P.    
Schedule of Investments [Line Items]    
Amortized Cost 1,763.0 2,048.0
Fair Value 1,987.0 2,201.0
Subordinated loan    
Schedule of Investments [Line Items]    
Amortized Cost 62.0 500.0
Fair Value 62.0 500.0
Equity    
Schedule of Investments [Line Items]    
Amortized Cost 1,701.0 1,548.0
Fair Value $ 1,925.0 $ 1,701.0
[1] As of December 31, 2023, the estimated net unrealized loss for federal tax purposes was $0.4 billion based on a tax cost basis of $22.5 billion. As of December 31, 2023, the estimated aggregate gross unrealized loss for federal income tax purposes was $1.7 billion and the estimated aggregate gross unrealized gain for federal income tax purposes was $1.3 billion.     
[2] As of December 31, 2022, the estimated net unrealized loss for federal tax purposes was $0.2 billion based on a tax cost basis of $22.0 billion. As of December 31, 2022, the estimated aggregate gross unrealized loss for federal income tax purposes was $1.2 billion and the estimated aggregate gross unrealized gain for federal income tax purposes was $1.0 billion.