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INVESTMENTS - Carrying Value of Investments (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Total	$ 2,879.3	$ 2,975.5
U.S. Treasury note
Schedule of Equity Method Investments [Line Items]
Held to maturity	1.0	1.0
Discretionary investments
Schedule of Equity Method Investments [Line Items]
Investments held at fair value	502.2	518.7
Seed capital
Schedule of Equity Method Investments [Line Items]
Investments held at fair value	224.6	264.8
Equity method investments	134.0	141.7
Supplemental savings plan liability economic hedges
Schedule of Equity Method Investments [Line Items]
Investments held at fair value	820.0	881.5
Investment partnerships and other investments
Schedule of Equity Method Investments [Line Items]
Investments held at fair value	105.0	108.9
Equity method investments	2.5	2.5
Investments in affiliated collateralized loan obligations
Schedule of Equity Method Investments [Line Items]
Investments held at fair value	9.3	10.8
Held to maturity	115.2	119.1
Investments in affiliated private investment funds - carried interest
Schedule of Equity Method Investments [Line Items]
Equity method investments	642.1	609.8
Investments in affiliated private investment funds - seed/co-investment
Schedule of Equity Method Investments [Line Items]
Equity method investments	153.1	151.3
23% Investment in UTI Asset Management Company Limited (India)
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 170.3	$ 165.4
Equity method investment (ownership percentage)	23.00%	23.00%

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