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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES - Investment Advisory Services (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Revenue and Services [Line Items] |  |
Net revenues | $ 1,763.9 | $ 1,750.2
Investment advisory fees |  |
Revenue and Services [Line Items] |  |
Net revenues | 1,598.4 | 1,536.4
Investment advisory fees | Assets under management |  |
Revenue and Services [Line Items] |  |
Net revenues | 1,620,300.0 | 1,484,400.0
Performance-based advisory fees |  |
Revenue and Services [Line Items] |  |
Net revenues | 10.4 | 17.6
Capital allocation-based income |  |
Revenue and Services [Line Items] |  |
Net revenues | (1.2) | 47.1
Administrative, distribution, services, and other fees |  |
Revenue and Services [Line Items] |  |
Net revenues | 156.3 | 149.1
Equity | Investment advisory fees | Assets under management |  |
Revenue and Services [Line Items] |  |
Net revenues | 826,300.0 | 770,400.0
Fixed income, including money market | Investment advisory fees | Assets under management |  |
Revenue and Services [Line Items] |  |
Net revenues | 191,600.0 | 169,500.0
Multi-asset | Investment advisory fees | Assets under management |  |
Revenue and Services [Line Items] |  |
Net revenues | 549,700.0 | 497,000.0
Alternatives | Investment advisory fees | Assets under management |  |
Revenue and Services [Line Items] |  |
Net revenues | 52,700.0 | 47,500.0
Investment advisory fees | Investment advisory fees |  |
Revenue and Services [Line Items] |  |
Net revenues | 1,598.4 | 1,536.4
Investment advisory fees | Equity | Investment advisory fees |  |
Revenue and Services [Line Items] |  |
Net revenues | 959.2 | 932.5
Investment advisory fees | Fixed income, including money market | Investment advisory fees |  |
Revenue and Services [Line Items] |  |
Net revenues | 103.6 | 100.2
Investment advisory fees | Multi-asset | Investment advisory fees |  |
Revenue and Services [Line Items] |  |
Net revenues | 454.7 | 429.7
Investment advisory fees | Alternatives | Investment advisory fees |  |
Revenue and Services [Line Items] |  |
Net revenues | $ 80.9 | $ 74.0

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