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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES - Investment Advisory Services (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Revenue and Services [Line Items]        
Net revenues $ 1,610.2 $ 1,513.0 $ 3,147.8 $ 3,376.0
Investment advisory fees        
Revenue and Services [Line Items]        
Net revenues 1,430.8 1,496.7 2,822.6 3,158.8
Investment advisory fees | Assets under management        
Revenue and Services [Line Items]        
Net revenues 1,357,400.0 1,407,100.0 1,340,200.0 1,483,000.0
Investment advisory fees | Assets under management | Equity        
Revenue and Services [Line Items]        
Net revenues 703,400.0 769,600.0 695,200.0 827,700.0
Investment advisory fees | Assets under management | Fixed income, including money market        
Revenue and Services [Line Items]        
Net revenues 170,400.0 174,800.0 170,000.0 176,300.0
Investment advisory fees | Assets under management | Multi-asset        
Revenue and Services [Line Items]        
Net revenues 439,000.0 420,200.0 430,700.0 436,900.0
Investment advisory fees | Assets under management | Alternatives        
Revenue and Services [Line Items]        
Net revenues 44,600.0 42,500.0 44,300.0 42,100.0
Investment advisory fees | Investment advisory fees        
Revenue and Services [Line Items]        
Net revenues 1,430.8 1,496.7 2,822.6 3,158.8
Investment advisory fees | Investment advisory fees | Equity        
Revenue and Services [Line Items]        
Net revenues 862.3 941.0 1,696.2 2,027.0
Investment advisory fees | Investment advisory fees | Fixed income, including money market        
Revenue and Services [Line Items]        
Net revenues 100.0 109.9 202.4 216.5
Investment advisory fees | Investment advisory fees | Multi-asset        
Revenue and Services [Line Items]        
Net revenues 391.3 377.5 777.3 782.1
Investment advisory fees | Investment advisory fees | Alternatives        
Revenue and Services [Line Items]        
Net revenues 77.2 68.3 146.7 133.2
Administrative, distribution, and servicing fees        
Revenue and Services [Line Items]        
Net revenues 140.7 142.6 269.6 299.1
Capital allocation-based income        
Revenue and Services [Line Items]        
Net revenues $ 38.7 $ (126.3) $ 55.6 $ (81.9)