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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Revenue and Services [Line Items]        
Net revenues $ 1,670.7 $ 1,588.2 $ 4,818.5 $ 4,964.2
Investment advisory fees        
Revenue and Services [Line Items]        
Net revenues 1,463.9 1,442.0 4,286.5 4,600.8
Investment advisory fees | Assets under management        
Revenue and Services [Line Items]        
Net revenues 1,393,600.0 1,347,500.0 1,358,200.0 1,437,100.0
Capital allocation-based income        
Revenue and Services [Line Items]        
Net revenues 66.1 1.1 121.7 (80.8)
Administrative, distribution, and servicing fees        
Revenue and Services [Line Items]        
Net revenues 140.7 145.1 410.3 444.2
Equity | Investment advisory fees | Assets under management        
Revenue and Services [Line Items]        
Net revenues 725,000.0 724,900.0 705,300.0 793,000.0
Fixed income, including money market | Investment advisory fees | Assets under management        
Revenue and Services [Line Items]        
Net revenues 169,000.0 173,000.0 169,600.0 175,100.0
Multi-asset | Investment advisory fees | Assets under management        
Revenue and Services [Line Items]        
Net revenues 453,800.0 406,700.0 438,500.0 426,600.0
Alternatives | Investment advisory fees | Assets under management        
Revenue and Services [Line Items]        
Net revenues 45,800.0 42,900.0 44,800.0 42,400.0
Investment advisory fees | Investment advisory fees        
Revenue and Services [Line Items]        
Net revenues 1,463.9 1,442.0 4,286.5 4,600.8
Investment advisory fees | Equity | Investment advisory fees        
Revenue and Services [Line Items]        
Net revenues 885.0 897.0 2,581.2 2,924.0
Investment advisory fees | Fixed income, including money market | Investment advisory fees        
Revenue and Services [Line Items]        
Net revenues 100.9 107.6 303.3 324.1
Investment advisory fees | Multi-asset | Investment advisory fees        
Revenue and Services [Line Items]        
Net revenues 405.5 367.2 1,182.8 1,149.3
Investment advisory fees | Alternatives | Investment advisory fees        
Revenue and Services [Line Items]        
Net revenues $ 72.5 $ 70.2 $ 219.2 $ 203.4