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INVESTMENTS - Narrative (Details) € in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 EUR (€)	Dec. 31, 2022 USD ($)	Dec. 31, 2022 EUR (€)
Debt and Equity Securities, FV-NI [Line Items]
Net unrealized gains (losses) on T. Rowe Price investments product recognized in nonoperating income	$ (46.1)	$ (35.3)	$ 28.9	$ (258.7)
Investments in affiliated collateralized loan obligations
Debt and Equity Securities, FV-NI [Line Items]
Secured debt	$ 26.6		$ 26.6		€ 25.2	$ 31.7	€ 25.2
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%		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	12.52%		12.52%		12.52%
Investments in affiliated collateralized loan obligations | Repurchase Agreements
Debt and Equity Securities, FV-NI [Line Items]
Secured debt, repurchase agreements	$ 69.5		$ 69.5		€ 65.7	71.3	€ 65.7
Investments in affiliated collateralized loan obligations | Accounts Payable and Accrued Liabilities
Debt and Equity Securities, FV-NI [Line Items]
Debt assumed	$ 96.1		$ 96.1			$ 103.0

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