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INVESTMENTS - Narrative (Details) € in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Mar. 31, 2024 EUR (€)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 EUR (€)
Debt and Equity Securities, FV-NI [Line Items]
Net unrealized (loss) gain on T. Rowe Price investments product recognized in nonoperating income	$ 64.5	$ 46.7
Investments in affiliated collateralized loan obligations
Debt and Equity Securities, FV-NI [Line Items]
Secured debt, repurchase agreements	69.3		€ 64.2	$ 72.3	€ 64.2
Secured debt	$ 15.0		€ 13.9	17.1	€ 13.9
Investments in affiliated collateralized loan obligations | Minimum | Euro Interbank Offer Rate (EURIBOR)
Debt and Equity Securities, FV-NI [Line Items]
Investment interest rate	1.15%		1.15%
Investments in affiliated collateralized loan obligations | Maximum | Euro Interbank Offer Rate (EURIBOR)
Debt and Equity Securities, FV-NI [Line Items]
Investment interest rate	12.84%		12.84%
Investments in affiliated collateralized loan obligations | Accounts Payable and Accrued Liabilities
Debt and Equity Securities, FV-NI [Line Items]
Debt assumed	$ 84.3			$ 89.4

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