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INVESTMENTS - Carrying Value of Investments (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Total	$ 2,606.2	$ 2,539.2
U.S. Treasury note
Schedule of Equity Method Investments [Line Items]
Held to maturity	1.0	1.0
Certificates of deposit
Schedule of Equity Method Investments [Line Items]
Held to maturity	11.0	9.2
Discretionary investments
Schedule of Equity Method Investments [Line Items]
Investments held at fair value	244.2	242.0
Equity method investments	208.0	199.6
Seed capital
Schedule of Equity Method Investments [Line Items]
Investments held at fair value	249.2	195.1
Equity method investments	85.1	125.7
Supplemental savings plan liability economic hedges
Schedule of Equity Method Investments [Line Items]
Investments held at fair value	786.7	760.7
Investment partnerships and other investments
Schedule of Equity Method Investments [Line Items]
Investments held at fair value	80.7	87.1
Equity method investments	2.1	2.4
Investments in affiliated collateralized loan obligations
Schedule of Equity Method Investments [Line Items]
Investments held at fair value	7.2	6.4
Held to maturity	$ 108.3	$ 109.6
23% Investment in UTI Asset Management Company Limited (India)
Schedule of Equity Method Investments [Line Items]
Equity method investment (ownership percentage)	23.00%	23.00%
Equity method investments	$ 159.5	$ 158.8
Investments in affiliated private investment funds - carried interest
Schedule of Equity Method Investments [Line Items]
Equity method investments	483.8	467.8
Investments in affiliated private investment funds - seed/co-investment
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 179.4	$ 173.8

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