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INVESTMENTS - Amortized Cost and Fair Value of the Investment in IHAM (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Amortized Cost $ 26,374.0 [1] $ 22,667.6 [2]
Fair Value 26,719.9 [1] 22,873.7 [2]
Total net adjusted unfunded loan commitments 29.0 32.0
Ivy Hill Asset Management, L.P.    
Schedule of Investments [Line Items]    
Amortized Cost 2,237.0 2,288.0
Fair Value 8,173.0 9,401.0
Total net adjusted unfunded loan commitments 500.0  
Ivy Hill Asset Management, L.P.    
Schedule of Investments [Line Items]    
Amortized Cost 1,701.0 1,763.0
Fair Value 1,915.0 1,987.0
Subordinated loan    
Schedule of Investments [Line Items]    
Amortized Cost 0.0 62.0
Fair Value 0.0 62.0
Equity    
Schedule of Investments [Line Items]    
Amortized Cost 1,701.0 1,701.0
Fair Value $ 1,915.0 $ 1,925.0
[1] 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.     
[2] 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.