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INVESTMENTS - Carrying Value of Investments (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]    
Investment, Type [Extensible Enumeration] Certificates of Deposit [Member] Certificates of Deposit [Member]
Held to maturity $ 32.5 $ 23.3
Total 2,966.0 2,554.7
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 261.0 246.4
Equity method investments 60.9 5.3
Seed capital    
Schedule of Equity Method Investments [Line Items]    
Investments held at fair value 297.6 247.8
Equity method investments 196.2 91.1
Supplemental savings plan liability economic hedges    
Schedule of Equity Method Investments [Line Items]    
Investments held at fair value 901.9 806.6
Equity method investments 67.2 21.0
Investment partnerships and other investments    
Schedule of Equity Method Investments [Line Items]    
Investments held at fair value 105.7 69.7
Investments in affiliated collateralized loan obligations    
Schedule of Equity Method Investments [Line Items]    
Investments held at fair value 7.6 8.4
Held to maturity $ 80.6 $ 94.1
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 $ 166.3 $ 164.5
Investments in affiliated private investment funds - carried interest    
Schedule of Equity Method Investments [Line Items]    
Equity method investments 499.7 519.9
Investments in affiliated private investment funds - seed/co-investment    
Schedule of Equity Method Investments [Line Items]    
Equity method investments 286.1 253.4
Investments in partnerships and other investments    
Schedule of Equity Method Investments [Line Items]    
Equity method investments $ 1.7 $ 2.2