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INVESTMENTS - Narrative (Details) € in Millions, $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2021 EUR (€)	Oct. 31, 2020 segment
Debt and Equity Securities, FV-NI [Line Items]
Net unrealized gains on T. Rowe Price investments product recognized in nonoperating income		$ 63.6	$ 142.7	$ 105.4
Number of equity method investments | segment						1
Seed capital
Debt and Equity Securities, FV-NI [Line Items]
Dividend distribution		90.2	$ 50.8	$ 50.6
Investment in UTI Asset Management Company Limited (India)
Debt and Equity Securities, FV-NI [Line Items]
Equity method investment (ownership percentage)	26.00%		26.00%			23.00%
Gain on sale of equity investments	$ 2.8
Investments in Affiliated Private Investment Funds
Debt and Equity Securities, FV-NI [Line Items]
Long-term investments		761.1
European Collateralized Loan Obligations
Debt and Equity Securities, FV-NI [Line Items]
Secured debt		129.9
Investments in affiliated collateralized loan obligations
Debt and Equity Securities, FV-NI [Line Items]
Secured debt		$ 36.9			€ 32.4
Percentage of interest expense		0.50%			0.50%
Investments in affiliated collateralized loan obligations | Accounts Payable and Accrued Liabilities
Debt and Equity Securities, FV-NI [Line Items]
Debt assumed		$ 113.5
Investments in affiliated collateralized loan obligations | Euro Interbank Offer Rate (EURIBOR) | Minimum
Debt and Equity Securities, FV-NI [Line Items]
Investment interest rate		1.70%			1.70%
Investments in affiliated collateralized loan obligations | Euro Interbank Offer Rate (EURIBOR) | Maximum
Debt and Equity Securities, FV-NI [Line Items]
Investment interest rate		1.95%			1.95%
Investments in affiliated collateralized loan obligations | Vertical Strip Investment
Debt and Equity Securities, FV-NI [Line Items]
Percentage of long term investments purchased		5.00%			5.00%
Investments in affiliated collateralized loan obligations | Repurchase Agreements
Debt and Equity Securities, FV-NI [Line Items]
Secured debt, repurchase agreements		$ 75.9			€ 66.7

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