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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES - Services Concentration and Receivables (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Concentration Risk [Line Items]
Net revenues	$ 6,488.4	$ 7,671.9	$ 6,206.7
Accounts receivable	748.7	1,058.3
Sponsored Investment Products
Concentration Risk [Line Items]
Net revenues	5,326.3	6,259.3	$ 5,044.3
Accounts receivable	$ 492.4	$ 577.9
Outside U.S. | Assets under management | Investment advisory clients | Geographic concentration
Concentration Risk [Line Items]
Concentration risk, percentage	9.10%	9.90%

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