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INVESTMENTS - Carrying Value of Investments (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Schedule of Equity Method Investments [Line Items]    
Investment, Type [Extensible Enumeration] Certificates of Deposit [Member] Certificates of Deposit [Member]
Held to maturity $ 45.2 $ 44.7
Total 3,240.3 3,000.5
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 440.4 258.8
Equity method investments 20.0 60.8
Seed capital    
Schedule of Equity Method Investments [Line Items]    
Investments held at fair value 515.9 262.8
Equity method investments 40.8 128.8
Deferred compensation liabilities economic hedges    
Schedule of Equity Method Investments [Line Items]    
Investments held at fair value 1,004.2 992.8
Equity method investments 50.2 88.4
Investment partnerships and other investments    
Schedule of Equity Method Investments [Line Items]    
Investments held at fair value 79.0 62.6
Investments in affiliated collateralized loan obligations    
Schedule of Equity Method Investments [Line Items]    
Investments held at fair value 4.8 6.3
Held to maturity 46.6 61.1
Investment in UTI Asset Management Company Limited (India)    
Schedule of Equity Method Investments [Line Items]    
Equity method investments 174.2 173.5
Investments in affiliated private investment funds - carried interest    
Schedule of Equity Method Investments [Line Items]    
Equity method investments 382.6 426.9
Investments in affiliated private investment funds - seed/co-investment    
Schedule of Equity Method Investments [Line Items]    
Equity method investments 264.4 269.9
Investment partnerships and other investments    
Schedule of Equity Method Investments [Line Items]    
Equity method investments $ 171.0 $ 162.1