INVESTMENTS - Ivy Hill Asset Management, L.P. (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) borrower		Dec. 31, 2023 USD ($)		Dec. 31, 2022 USD ($)
Schedule of Investments [Line Items]
Amortized cost of investments	$ 26,374.0	[1]	$ 22,667.6	[2]
Purchases of investments	12,622.0		5,804.0		$ 9,852.0
Ivy Hill Asset Management, L.P.
Schedule of Investments [Line Items]
Purchases of investments	759.0		1,193.0		3,358.0
Ivy Hill Asset Management, L.P.
Schedule of Investments [Line Items]
Assets under management	$ 12,800.0
Number of borrowers | borrower	20
Amortized cost of investments	$ 2,237.0		2,288.0
Other income	15.0		10.0		10.0
Purchases of investments	32.0		85.0		27.0
Realized loss on sale of investments	1.0		13.0		20.0
Ivy Hill Asset Management, L.P. | Operating Segments | Ivy Hill Asset Management, L.P.
Schedule of Investments [Line Items]
Amortized cost of investments	8,343.0		9,619.0
Other income	53.0		56.0		49.0
Other investment-related income	$ 344.0		$ 328.0		$ 188.0

[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.