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INVESTMENTS - Carrying Value of Investments (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Debt and Equity Securities, FV-NI [Line Items]    
Total $ 2,539.2 $ 2,975.5
Certificates of Deposit    
Debt and Equity Securities, FV-NI [Line Items]    
Held to maturity 9.2 0.0
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 242.0 518.7
Equity method investments 199.6 0.0
Seed capital    
Debt and Equity Securities, FV-NI [Line Items]    
Investments held at fair value 195.1 264.8
Equity method investments 125.7 141.7
Supplemental savings plan liability economic hedges    
Debt and Equity Securities, FV-NI [Line Items]    
Investments held at fair value 760.7 881.5
Investment partnerships and other investments    
Debt and Equity Securities, FV-NI [Line Items]    
Investments held at fair value 87.1 108.9
Equity method investments 2.4 2.5
Investments in affiliated collateralized loan obligations    
Debt and Equity Securities, FV-NI [Line Items]    
Held to maturity 109.6 119.1
Investment in UTI Asset Management Company Limited (India)    
Debt and Equity Securities, FV-NI [Line Items]    
Equity method investments 158.8 165.4
Investments in affiliated private investment funds - carried interest    
Debt and Equity Securities, FV-NI [Line Items]    
Equity method investments 467.8 609.8
Investments in affiliated private investment funds - seed/co-investment    
Debt and Equity Securities, FV-NI [Line Items]    
Equity method investments $ 173.8 $ 151.3