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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Jun. 30, 2023	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Concentration Risk [Line Items]
Net revenues	$ 1,670.7	$ 1,588.2		$ 4,818.5	$ 4,964.2
Accounts receivable	752.0			752.0		$ 748.7
Sponsored investment portfolios
Concentration Risk [Line Items]
Net revenues	1,387.5	$ 1,311.2		3,979.9	$ 4,069.7
Accounts receivable	$ 488.2			$ 488.2		$ 492.4
Investment advisory fees | Assets under management | Geographic concentration | Outside U.S.
Concentration Risk [Line Items]
Concentration risk			8.90%	9.20%		9.10%

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