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FAIR VALUE OF ASSETS AND LIABILITIES - Tri-Level Hierarchy, Carrying Value (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Equity investments:    
Total $ 859.7 $ 850.5
Liabilities:    
Total   (10.7)
Equity method investments 805.8 854.5
Other investments 29.5 14.3
Total return swap related to deferred compensation plans    
Equity investments:    
Total return swap related to deferred compensation plans 26.6  
Liabilities:    
Total return swap related to deferred compensation plans   (9.4)
Contingent consideration liability    
Liabilities:    
Contingent consideration liability   (1.3)
Money market funds    
Cash equivalents:    
Money market funds 504.2 479.3
Seed capital    
Equity investments:    
Equity investments 203.4 151.6
Investments related to deferred compensation plans    
Equity investments:    
Equity investments 125.5 219.6
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Equity investments:    
Total 833.1 850.5
Liabilities:    
Total   0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Total return swap related to deferred compensation plans    
Equity investments:    
Total return swap related to deferred compensation plans 0.0  
Liabilities:    
Total return swap related to deferred compensation plans   0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Contingent consideration liability    
Liabilities:    
Contingent consideration liability   0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds    
Cash equivalents:    
Money market funds 504.2 479.3
Quoted Prices in Active Markets for Identical Assets (Level 1) | Seed capital    
Equity investments:    
Equity investments 203.4 151.6
Quoted Prices in Active Markets for Identical Assets (Level 1) | Investments related to deferred compensation plans    
Equity investments:    
Equity investments 125.5 219.6
Significant Other Observable Inputs (Level 2)    
Equity investments:    
Total 26.6 0.0
Liabilities:    
Total   (9.4)
Significant Other Observable Inputs (Level 2) | Total return swap related to deferred compensation plans    
Equity investments:    
Total return swap related to deferred compensation plans 26.6  
Liabilities:    
Total return swap related to deferred compensation plans   (9.4)
Significant Other Observable Inputs (Level 2) | Contingent consideration liability    
Liabilities:    
Contingent consideration liability   0.0
Significant Other Observable Inputs (Level 2) | Money market funds    
Cash equivalents:    
Money market funds 0.0 0.0
Significant Other Observable Inputs (Level 2) | Seed capital    
Equity investments:    
Equity investments 0.0 0.0
Significant Other Observable Inputs (Level 2) | Investments related to deferred compensation plans    
Equity investments:    
Equity investments 0.0 0.0
Significant Unobservable Inputs (Level 3)    
Equity investments:    
Total 0.0 0.0
Liabilities:    
Total   (1.3)
Significant Unobservable Inputs (Level 3) | Total return swap related to deferred compensation plans    
Equity investments:    
Total return swap related to deferred compensation plans 0.0  
Liabilities:    
Total return swap related to deferred compensation plans   0.0
Significant Unobservable Inputs (Level 3) | Contingent consideration liability    
Liabilities:    
Contingent consideration liability   (1.3)
Significant Unobservable Inputs (Level 3) | Money market funds    
Cash equivalents:    
Money market funds 0.0 0.0
Significant Unobservable Inputs (Level 3) | Seed capital    
Equity investments:    
Equity investments 0.0 0.0
Significant Unobservable Inputs (Level 3) | Investments related to deferred compensation plans    
Equity investments:    
Equity investments $ 0.0 $ 0.0