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INVESTMENTS - Narrative (Details) € in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 EUR (€)	Dec. 31, 2022 USD ($)	Dec. 31, 2022 EUR (€)
Debt and Equity Securities, FV-NI [Line Items]
Net unrealized (loss) gain on T. Rowe Price investments product recognized in nonoperating income	$ 28.3	$ (131.2)	$ (75.0)	$ (225.5)
Investments in affiliated collateralized loan obligations
Debt and Equity Securities, FV-NI [Line Items]
Secured debt	$ 28.3		$ 28.3		€ 35.6	$ 31.7	€ 35.6
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	12.07%		12.07%		12.07%
Investments in affiliated collateralized loan obligations | Repurchase Agreements
Debt and Equity Securities, FV-NI [Line Items]
Secured debt, repurchase agreements	$ 71.7		$ 71.7		€ 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	$ 100.0		$ 100.0			$ 103.0

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