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INVESTMENTS - Ivy Hill Asset Management, L.P. (Details) $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($) borrower	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)
Schedule of Investments [Line Items]
Amortized cost of investments	$ 21,429.6		$ 22,043.0
Purchases of investments	1,121.0	$ 2,077.0
Ivy Hill Asset Management, L.P.
Schedule of Investments [Line Items]
Amortized cost of investments	2,139.0		2,048.0
Purchases of investments	0.0	27.0
Realized loss on sale of investments	10.0	6.0
Ivy Hill Asset Management, L.P.
Schedule of Investments [Line Items]
Assets under management	$ 13,500.0
Number of borrowers | borrower	22
Amortized cost of investments	$ 2,444.0		$ 2,370.0
Management and incentive fee income	14.0	10.0
Other investment-related income	61.0	34.0
Purchases of investments	$ 652.0	$ 1,176.0

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