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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES - Services Concentration and Receivables (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Concentration Risk [Line Items]
Net revenues	$ 1,537.6	$ 1,863.0
Accounts receivable	$ 730.4		$ 748.7
Investment advisory fees | Assets under management | Geographic concentration | Outside U.S.
Concentration Risk [Line Items]
Concentration risk	8.90%		9.10%
Sponsored investment portfolios
Concentration Risk [Line Items]
Net revenues	$ 1,268.0	$ 1,536.4
Accounts receivable	$ 498.5		$ 492.4

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