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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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