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INVESTMENTS - Narrative (Details) € in Millions, $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2022 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		$ (240.5)	$ 63.6	$ 142.7
Number of equity method investments | segment						1
Seed capital
Debt and Equity Securities, FV-NI [Line Items]
Dividend distribution		$ 45.3	90.2	$ 50.8
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 European 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 European Collateralized Loan Obligations | Accounts Payable and Accrued Liabilities
Debt and Equity Securities, FV-NI [Line Items]
Debt assumed		$ 116.0
Investments in affiliated collateralized loan obligations
Debt and Equity Securities, FV-NI [Line Items]
Percentage of interest expense		0.50%			0.50%
Secured debt		$ 31.7	36.9		€ 35.6
Investments in affiliated collateralized loan obligations | Accounts Payable and Accrued Liabilities
Debt and Equity Securities, FV-NI [Line Items]
Debt assumed		$ 103.0	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		3.16%			3.16%
Investments in affiliated collateralized loan obligations | Euro Interbank Offer Rate (EURIBOR) | Maximum
Debt and Equity Securities, FV-NI [Line Items]
Investment interest rate		3.41%			3.41%
Investments in affiliated collateralized loan obligations | Repurchase Agreements
Debt and Equity Securities, FV-NI [Line Items]
Secured debt, repurchase agreements		$ 71.3	$ 75.9		€ 66.7

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