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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, 2022	Mar. 31, 2021	Dec. 31, 2021
Concentration Risk [Line Items]
Net revenues	$ 1,863.0	$ 1,826.8
Accounts receivable	919.5		$ 1,058.3
Sponsored investment portfolios
Concentration Risk [Line Items]
Net revenues	1,536.4	$ 1,482.3
Accounts receivable	$ 584.5		$ 577.9
Investment advisory clients | Outside U.S. | Assets under management | Geographic concentration
Concentration Risk [Line Items]
Concentration risk	9.70%		9.90%

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