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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Concentration Risk [Line Items]
Net revenues	$ 1,723.3		$ 1,733.3	$ 3,487.2	$ 3,483.5
Accounts receivable	861.8			861.8		$ 877.4
Sponsored investment portfolios
Concentration Risk [Line Items]
Net revenues	1,435.2		$ 1,429.4	2,906.5	$ 2,873.0
Accounts receivable	$ 595.2			$ 595.2		$ 602.0
Investment advisory fees | Assets under management | Geographic concentration | Outside U.S.
Concentration Risk [Line Items]
Concentration risk	8.70%	8.70%				8.80%

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