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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Concentration Risk [Line Items]
Net revenues	$ 1,763.9	$ 1,750.2
Accounts receivable	934.6		$ 877.4
Sponsored investment portfolios
Concentration Risk [Line Items]
Net revenues	1,471.3	$ 1,443.6
Accounts receivable	$ 638.2		$ 602.0
Investment advisory fees | Assets under management | Geographic concentration | Outside U.S.
Concentration Risk [Line Items]
Concentration risk	8.70%		8.80%

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