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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES - Investment Advisory Services (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Revenue and Services [Line Items] |  |  |
Net revenues | $ 7,093.6 | $ 6,460.5 | $ 6,488.4
Investment advisory fees |  |  |
Revenue and Services [Line Items] |  |  |
Net revenues | 6,399.7 | 5,709.5 | 5,962.7
Investment advisory fees | Assets under management |  |  |
Revenue and Services [Line Items] |  |  |
Net revenues | 1,561,900.0 | 1,362,300.0 | 1,398,400.0
Capital allocation-based income |  |  |
Revenue and Services [Line Items] |  |  |
Net revenues | 46.6 | 161.9 | (54.3)
Administrative, distribution, and servicing fees |  |  |
Revenue and Services [Line Items] |  |  |
Net revenues | 588.0 | 550.9 | 573.6
Equity | Investment advisory fees | Assets under management |  |  |
Revenue and Services [Line Items] |  |  |
Net revenues | 804,300.0 | 705,200.0 | 763,600.0
Fixed income, including money market | Investment advisory fees | Assets under management |  |  |
Revenue and Services [Line Items] |  |  |
Net revenues | 178,600.0 | 169,300.0 | 173,400.0
Multi-asset | Investment advisory fees | Assets under management |  |  |
Revenue and Services [Line Items] |  |  |
Net revenues | 529,000.0 | 442,300.0 | 418,700.0
Alternatives | Investment advisory fees | Assets under management |  |  |
Revenue and Services [Line Items] |  |  |
Net revenues | 50,000.0 | 45,500.0 | 42,700.0
Investment advisory fees | Investment advisory fees |  |  |
Revenue and Services [Line Items] |  |  |
Net revenues | 6,399.7 | 5,709.5 | 5,962.7
Investment advisory fees | Equity | Investment advisory fees |  |  |
Revenue and Services [Line Items] |  |  |
Net revenues | 3,864.7 | 3,442.3 | 3,758.4
Investment advisory fees | Fixed income, including money market | Investment advisory fees |  |  |
Revenue and Services [Line Items] |  |  |
Net revenues | 410.7 | 400.4 | 426.3
Investment advisory fees | Multi-asset | Investment advisory fees |  |  |
Revenue and Services [Line Items] |  |  |
Net revenues | 1,814.1 | 1,583.4 | 1,508.9
Investment advisory fees | Alternatives | Investment advisory fees |  |  |
Revenue and Services [Line Items] |  |  |
Net revenues | $ 310.2 | $ 283.4 | $ 269.1

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