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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES - Investment Advisory Services (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Revenue and Services [Line Items]        
Net revenues $ 1,785.6 $ 1,670.7 $ 5,269.1 $ 4,818.5
Investment advisory fees        
Revenue and Services [Line Items]        
Net revenues 1,632.9 1,463.9 4,772.5 4,286.5
Investment advisory fees | Assets under management        
Revenue and Services [Line Items]        
Net revenues 1,589,500.0 1,393,600.0 1,536,200.0 1,358,200.0
Capital allocation-based income        
Revenue and Services [Line Items]        
Net revenues 4.6 66.1 51.8 121.7
Administrative, distribution, and servicing fees        
Revenue and Services [Line Items]        
Net revenues 148.1 140.7 444.8 410.3
Equity | Investment advisory fees | Assets under management        
Revenue and Services [Line Items]        
Net revenues 813,100.0 725,000.0 791,400.0 705,300.0
Fixed income, including money market | Investment advisory fees | Assets under management        
Revenue and Services [Line Items]        
Net revenues 183,300.0 169,000.0 175,900.0 169,600.0
Multi-asset | Investment advisory fees | Assets under management        
Revenue and Services [Line Items]        
Net revenues 542,300.0 453,800.0 519,900.0 438,500.0
Alternatives | Investment advisory fees | Assets under management        
Revenue and Services [Line Items]        
Net revenues 50,800.0 45,800.0 49,000.0 44,800.0
Investment advisory fees | Investment advisory fees        
Revenue and Services [Line Items]        
Net revenues 1,632.9 1,463.9 4,772.5 4,286.5
Investment advisory fees | Equity | Investment advisory fees        
Revenue and Services [Line Items]        
Net revenues 978.5 885.0 2,877.0 2,581.2
Investment advisory fees | Fixed income, including money market | Investment advisory fees        
Revenue and Services [Line Items]        
Net revenues 104.1 100.9 304.9 303.3
Investment advisory fees | Multi-asset | Investment advisory fees        
Revenue and Services [Line Items]        
Net revenues 465.8 405.5 1,340.3 1,182.8
Investment advisory fees | Alternatives | Investment advisory fees        
Revenue and Services [Line Items]        
Net revenues $ 84.5 $ 72.5 $ 250.3 $ 219.2