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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, 2024	Mar. 31, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Concentration Risk [Line Items]
Net revenues	$ 1,733.3		$ 1,610.2	$ 3,483.5	$ 3,147.8
Accounts receivable	846.9			846.9		$ 807.9
Sponsored investment portfolios
Concentration Risk [Line Items]
Net revenues	1,429.4		$ 1,324.4	2,873.0	$ 2,592.4
Accounts receivable	$ 577.3			$ 577.3		$ 533.9
Investment advisory fees | Assets under management | Geographic concentration | Outside U.S.
Concentration Risk [Line Items]
Concentration risk	8.60%	8.50%				8.60%

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