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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Concentration Risk [Line Items]
Net revenues	$ 1,750.2	$ 1,537.6
Accounts receivable	883.0		$ 807.9
Sponsored investment portfolios
Concentration Risk [Line Items]
Net revenues	1,443.6	$ 1,268.0
Accounts receivable	$ 582.2		$ 533.9
Investment advisory fees | Assets under management | Geographic concentration | Outside U.S.
Concentration Risk [Line Items]
Concentration risk	8.50%		8.60%

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