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INVESTMENTS - Ivy Hill Asset Management, L.P. (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
borrower
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
borrower
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Schedule of Investments [Line Items]          
Amortized cost of investments $ 28,566.5 [1]   $ 28,566.5 [1]   $ 26,374.0 [2]
Purchases of investments     9,263.0 $ 9,469.0  
Ivy Hill Asset Management, L.P.          
Schedule of Investments [Line Items]          
Purchases of investments     1,771.0 301.0  
Ivy Hill Asset Management, L.P.          
Schedule of Investments [Line Items]          
Assets under management $ 13,500.0   $ 13,500.0    
Number of borrowers | borrower 22   22    
Amortized cost of investments $ 2,767.0   $ 2,767.0   2,237.0
Other income 3.0 $ 3.0 8.0 11.0  
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 10,086.0   10,086.0   $ 8,343.0
Other income 15.0 13.0 39.0 41.0  
Other investment-related income $ 86.0 $ 75.0 $ 199.0 $ 266.0  
[1] As of September 30, 2025, the estimated net unrealized gain for federal tax purposes was approximately $0.3 billion based on a tax cost basis of $28.4 billion. As of September 30, 2025, the estimated aggregate gross unrealized gain for federal income tax purposes was approximately $1.3 billion and the estimated aggregate gross unrealized loss for federal income tax purposes was approximately $1.0 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.