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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Concentration Risk [Line Items]
Net revenues	$ 6,460.5	$ 6,488.4	$ 7,671.9
Accounts receivable	807.9	748.7
Sponsored Investment Products
Concentration Risk [Line Items]
Net revenues	5,327.9	5,326.3	$ 6,259.3
Accounts receivable	$ 533.9	$ 492.4
Investment advisory fees | Outside U.S. | Assets under management | Geographic concentration
Concentration Risk [Line Items]
Concentration risk	8.60%	9.10%

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