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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, 2023	Mar. 31, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Concentration Risk [Line Items]
Net revenues	$ 1,610.2		$ 1,513.0	$ 3,147.8	$ 3,376.0
Accounts receivable	761.4			761.4		$ 748.7
Sponsored investment portfolios
Concentration Risk [Line Items]
Net revenues	1,324.4		$ 1,221.1	2,592.4	$ 2,757.5
Accounts receivable	$ 493.0			$ 493.0		$ 492.4
Investment advisory fees | Assets under management | Geographic concentration | Outside U.S.
Concentration Risk [Line Items]
Concentration risk	8.90%	8.90%				9.10%

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