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INVESTMENTS - Narrative (Details) € in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 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	$ 44.3	$ (46.1)	$ 129.3	$ 28.9
Investments in affiliated collateralized loan obligations
Debt and Equity Securities, FV-NI [Line Items]
Debt assumed	75.8		75.8			$ 89.4
Secured debt, repurchase agreements	66.3		66.3		€ 59.4	72.3	€ 59.4
Secured debt	$ 9.5		$ 9.5		€ 8.5	$ 17.1	€ 8.5
Investments in affiliated collateralized loan obligations | Minimum
Debt and Equity Securities, FV-NI [Line Items]
Investment interest rate	1.15%		1.15%		1.15%
Investments in affiliated collateralized loan obligations | Maximum
Debt and Equity Securities, FV-NI [Line Items]
Investment interest rate	12.60%		12.60%		12.60%

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