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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES - Investment Advisory Services (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Revenue and Services [Line Items]      
Net revenues $ 6,460.5 $ 6,488.4 $ 7,671.9
Investment advisory fees      
Revenue and Services [Line Items]      
Net revenues 5,747.7 5,969.1 7,098.1
Investment advisory fees | Assets under management      
Revenue and Services [Line Items]      
Net revenues 1,362,300.0 1,398,400.0 1,599,300.0
Capital allocation-based income      
Revenue and Services [Line Items]      
Net revenues 161.9 (54.3) 0.0
Administrative, distribution, and servicing fees      
Revenue and Services [Line Items]      
Net revenues 550.9 573.6 573.8
Equity | Investment advisory fees | Assets under management      
Revenue and Services [Line Items]      
Net revenues 705,200.0 763,600.0 972,000.0
Fixed income, including money market | Investment advisory fees | Assets under management      
Revenue and Services [Line Items]      
Net revenues 169,300.0 173,400.0 177,700.0
Multi-asset | Investment advisory fees | Assets under management      
Revenue and Services [Line Items]      
Net revenues 442,300.0 418,700.0 449,600.0
Alternatives | Investment advisory fees | Assets under management      
Revenue and Services [Line Items]      
Net revenues 45,500.0 42,700.0 0.0
Investment advisory fees | Investment advisory fees      
Revenue and Services [Line Items]      
Net revenues 5,747.7 5,969.1 7,098.1
Investment advisory fees | Equity | Investment advisory fees      
Revenue and Services [Line Items]      
Net revenues 3,445.5 3,759.7 4,899.9
Investment advisory fees | Fixed income, including money market | Investment advisory fees      
Revenue and Services [Line Items]      
Net revenues 401.5 427.4 409.8
Investment advisory fees | Multi-asset | Investment advisory fees      
Revenue and Services [Line Items]      
Net revenues 1,583.4 1,508.9 1,788.4
Investment advisory fees | Alternatives | Investment advisory fees      
Revenue and Services [Line Items]      
Net revenues $ 317.3 $ 273.1 $ 0.0