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INVESTMENTS - Carrying Value of Investments (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]    
Total $ 2,718.4 $ 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 13.4 9.2
Discretionary investments    
Schedule of Equity Method Investments [Line Items]    
Investments held at fair value 242.1 242.0
Equity method investments 215.0 199.6
Seed capital    
Schedule of Equity Method Investments [Line Items]    
Investments held at fair value 233.2 195.1
Equity method investments 87.5 125.7
Supplemental savings plan liability economic hedges    
Schedule of Equity Method Investments [Line Items]    
Investments held at fair value 820.3 760.7
Investment partnerships and other investments    
Schedule of Equity Method Investments [Line Items]    
Investments held at fair value 76.3 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 6.9 6.4
Held to maturity $ 106.6 $ 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 $ 163.2 $ 158.8
Investments in affiliated private investment funds - carried interest    
Schedule of Equity Method Investments [Line Items]    
Equity method investments 514.2 467.8
Investments in affiliated private investment funds - seed/co-investment    
Schedule of Equity Method Investments [Line Items]    
Equity method investments $ 236.6 $ 173.8