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INVESTMENTS - Ivy Hill Asset Management, L.P. (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
USD ($)
borrower
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
borrower
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Schedule of Investments [Line Items]          
Amortized cost of investments $ 27,580.7 [1]   $ 27,580.7 [1]   $ 26,374.0 [2]
Purchases of investments     5,755.0 $ 6,221.0  
Ivy Hill Asset Management, L.P.          
Schedule of Investments [Line Items]          
Purchases of investments     1,371.0 35.0  
Ivy Hill Asset Management, L.P.          
Schedule of Investments [Line Items]          
Assets under management $ 13,100.0   $ 13,100.0    
Number of borrowers | borrower 21   21    
Amortized cost of investments $ 2,652.0   $ 2,652.0   2,237.0
Other income 2.0 $ 4.0 5.0 8.0  
Purchases of investments     0.0 32.0  
Realized gain (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 10,027.0   10,027.0   $ 8,343.0
Other income 12.0 14.0 24.0 28.0  
Other investment-related income $ 52.0 $ 92.0 $ 110.0 $ 191.0  
[1] As of June 30, 2025, the estimated net unrealized gain for federal tax purposes was approximately $0.3 billion based on a tax cost basis of $27.5 billion. As of June 30, 2025, the estimated aggregate gross unrealized gain for federal income tax purposes was approximately $1.8 billion and the estimated aggregate gross unrealized loss for federal income tax purposes was approximately $1.5 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.