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INVESTMENTS - Narrative (Details) € in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2025 EUR (€)	Dec. 31, 2024 USD ($)	Dec. 31, 2024 EUR (€)
Debt and Equity Securities, FV-NI [Line Items]
Net unrealized (loss) gain on T. Rowe Price investments product recognized in nonoperating income	$ (27.3)	$ 64.5
Investments in affiliated collateralized loan obligations
Debt and Equity Securities, FV-NI [Line Items]
Secured debt, repurchase agreements	$ 44.5		€ 41.2	$ 59.1	€ 56.9
Investments in affiliated collateralized loan obligations | Minimum
Debt and Equity Securities, FV-NI [Line Items]
Investment interest rate	1.15%		1.15%
Investments in affiliated collateralized loan obligations | Maximum
Debt and Equity Securities, FV-NI [Line Items]
Investment interest rate	11.61%		11.61%

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Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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