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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

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