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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Concentration Risk [Line Items] |  |  |
Net revenues | $ 7,093.6 | $ 6,460.5 | $ 6,488.4
Accounts receivable | 877.4 | 807.9 |
Investment Products |  |  |
Concentration Risk [Line Items] |  |  |
Net revenues | 5,859.8 | 5,327.9 | $ 5,326.3
Accounts receivable | $ 602.0 | $ 533.9 |
Investment advisory fees | Outside U.S. | Assets under management | Geographic concentration |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk | 8.80% | 8.60% |

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