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INVESTMENTS - Narrative (Details) € in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2023 EUR (€)	Dec. 31, 2022 EUR (€)
Debt and Equity Securities, FV-NI [Line Items]
Net unrealized gain (losses) on T. Rowe Price investments product recognized in nonoperating income	$ 86.7	$ (240.5)	$ 63.6
Seed capital
Debt and Equity Securities, FV-NI [Line Items]
Dividend distribution	38.2	45.3	$ 90.2
Investments in affiliated collateralized loan obligations
Debt and Equity Securities, FV-NI [Line Items]
Secured debt, repurchase agreements	72.3	71.3		€ 65.5	€ 65.5
Secured debt	$ 17.1	31.7		€ 15.5	€ 15.5
Investments in affiliated collateralized loan obligations | Euro Interbank Offer Rate (EURIBOR) | Minimum
Debt and Equity Securities, FV-NI [Line Items]
Investment interest rate	1.15%			1.15%
Investments in affiliated collateralized loan obligations | Euro Interbank Offer Rate (EURIBOR) | Maximum
Debt and Equity Securities, FV-NI [Line Items]
Investment interest rate	12.87%			12.87%
Investments in affiliated collateralized loan obligations | Accounts Payable and Accrued Liabilities
Debt and Equity Securities, FV-NI [Line Items]
Debt assumed	$ 89.4	$ 103.0
158800000 | Vertical Strip Investment
Debt and Equity Securities, FV-NI [Line Items]
Percentage of long term investments purchased	5.00%			5.00%

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