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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES - Services Concentration and Receivables (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Concentration Risk [Line Items]
Net revenues	$ 1,513.0		$ 1,929.3	$ 3,376.0	$ 3,756.1
Accounts receivable	773.2			773.2		$ 1,058.3
Sponsored investment portfolios
Concentration Risk [Line Items]
Net revenues	1,221.1		$ 1,571.9	2,757.5	$ 3,054.2
Accounts receivable	$ 513.2			$ 513.2		$ 577.9
Investment advisory clients | Outside U.S. | Assets under management | Geographic concentration
Concentration Risk [Line Items]
Concentration risk		9.70%		9.40%		9.90%

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Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business.

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