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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Concentration Risk [Line Items]
Net revenues	$ 1,785.6		$ 1,670.7	$ 5,269.1	$ 4,818.5
Accounts receivable	890.0			890.0		$ 807.9
Sponsored investment portfolios
Concentration Risk [Line Items]
Net revenues	1,486.5		$ 1,387.5	4,359.5	$ 3,979.9
Accounts receivable	$ 613.3			$ 613.3		$ 533.9
Investment advisory fees | Assets under management | Geographic concentration | Outside U.S.
Concentration Risk [Line Items]
Concentration risk	8.60%	8.60%				8.60%

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