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INVESTMENTS - Carrying Value of Investments (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]    
Total $ 2,563.7 $ 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 254.2 518.7
Equity method investments 203.0 0.0
Seed capital    
Schedule of Equity Method Investments [Line Items]    
Investments held at fair value 199.1 264.8
Equity method investments 133.5 141.7
Supplemental savings plan liability economic hedges    
Schedule of Equity Method Investments [Line Items]    
Investments held at fair value 725.7 881.5
Investment partnerships and other investments    
Schedule of Equity Method Investments [Line Items]    
Investments held at fair value 100.5 108.9
Equity method investments 2.4 2.5
Investments in affiliated collateralized loan obligations    
Schedule of Equity Method Investments [Line Items]    
Investments held at fair value 6.4 10.8
Held to maturity 108.7 119.1
Investments in affiliated private investment funds - carried interest    
Schedule of Equity Method Investments [Line Items]    
Equity method investments 507.2 609.8
Investments in affiliated private investment funds - seed/co-investment    
Schedule of Equity Method Investments [Line Items]    
Equity method investments $ 153.0 $ 151.3
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 $ 169.0 $ 165.4