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INVESTMENTS - Carrying Value of Investments (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Debt and Equity Securities, FV-NI [Line Items]
Total	$ 2,975.5	$ 3,250.8
U.S. Treasury note
Debt and Equity Securities, FV-NI [Line Items]
Held to maturity	1.0	1.0
Discretionary investments
Debt and Equity Securities, FV-NI [Line Items]
Investments held at fair value	518.7	1,647.7
Equity method investments	0.0	242.9
Seed capital
Debt and Equity Securities, FV-NI [Line Items]
Investments held at fair value	264.8	169.5
Equity method investments	141.7	178.6
Supplemental savings plan liability economic hedges
Debt and Equity Securities, FV-NI [Line Items]
Investments held at fair value	881.5	768.1
Investment partnerships and other investments
Debt and Equity Securities, FV-NI [Line Items]
Investments held at fair value	108.9	95.1
Equity method investments	2.5	2.4
Investments in affiliated collateralized loan obligations
Debt and Equity Securities, FV-NI [Line Items]
Investments held at fair value	10.8	0.0
Held to maturity	119.1	0.0
Investment in UTI Asset Management Company Limited (India)
Debt and Equity Securities, FV-NI [Line Items]
Equity method investments	165.4	145.5
Investments in affiliated private investment funds - carried interest
Debt and Equity Securities, FV-NI [Line Items]
Equity method investments	609.8	0.0
Investments in affiliated private investment funds - seed/co-investment
Debt and Equity Securities, FV-NI [Line Items]
Equity method investments	$ 151.3	$ 0.0

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