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INVESTMENTS - Ivy Hill Asset Management, L.P. (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
USD ($)
borrower
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
borrower
Jun. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Schedule of Investments [Line Items]          
Amortized cost of investments $ 29,674.6 [1]   $ 29,674.6 [1]   $ 29,249.9 [2]
Purchases of investments     6,295.0 $ 5,755.0  
Ivy Hill Asset Management, L.P.          
Schedule of Investments [Line Items]          
Purchases of investments     2,128.0 1,371.0  
Ivy Hill Asset Management, L.P.          
Schedule of Investments [Line Items]          
Assets under management $ 16,300.0   $ 16,300.0    
Number of borrowers | borrower 24   24    
Amortized cost of investments $ 3,628.0   $ 3,628.0   3,190.0
Other income 3.0 $ 2.0 5.0 5.0  
Realized gain (loss) on sale of investments     2.0 0.0  
Ivy Hill Asset Management, L.P. | Operating Segments | Ivy Hill Asset Management, L.P.          
Schedule of Investments [Line Items]          
Amortized cost of investments 13,381.0   13,381.0   $ 11,766.0
Other income 15.0 12.0 30.0 24.0  
Other investment-related income $ 100.0 $ 55.0 $ 198.0 $ 113.0  
[1] As of June 30, 2026, the estimated net unrealized loss for federal tax purposes was approximately $0.2 billion based on a tax cost basis of approximately $29.5 billion. As of June 30, 2026, the estimated aggregate gross unrealized loss for federal income tax purposes was approximately $1.5 billion and the estimated aggregate gross unrealized gain for federal income tax purposes was approximately $1.3 billion.     
[2] As of December 31, 2025, the estimated net unrealized gain for federal tax purposes was approximately $300 million based on a tax cost basis of $29.2 billion. As of December 31, 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.