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INVESTMENTS - Ivy Hill Asset Management, L.P. (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2025
USD ($)
borrower
Mar. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
Schedule of Investments [Line Items]      
Amortized cost of investments $ 26,777.5 [1]   $ 26,374.0 [2]
Purchases of investments 3,015.0 $ 2,947.0  
Ivy Hill Asset Management, L.P.      
Schedule of Investments [Line Items]      
Purchases of investments 794.0 35.0  
Ivy Hill Asset Management, L.P.      
Schedule of Investments [Line Items]      
Assets under management $ 12,900.0    
Number of borrowers | borrower 22    
Amortized cost of investments $ 2,419.0   2,237.0
Other income 3.0 4.0  
Purchases of investments 0.0 27.0  
Realized loss on sale of investments 0.0 1.0  
Ivy Hill Asset Management, L.P. | Operating Segments | Ivy Hill Asset Management, L.P.      
Schedule of Investments [Line Items]      
Amortized cost of investments 9,493.0   $ 8,343.0
Other income 12.0 14.0  
Other investment-related income $ 58.0 $ 99.0  
[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.