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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES - Services Concentration and Receivables (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2022	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Concentration Risk [Line Items]
Net revenues	$ 1,588.2	$ 1,954.1		$ 4,964.2	$ 5,710.2
Accounts receivable	741.4			741.4		$ 1,058.3
Sponsored investment portfolios
Concentration Risk [Line Items]
Net revenues	1,311.2	$ 1,599.5		4,069.7	$ 4,653.7
Accounts receivable	$ 490.2			$ 490.2		$ 577.9
Investment advisory clients | Outside U.S. | Assets under management | Geographic concentration
Concentration Risk [Line Items]
Concentration risk			9.40%	9.00%		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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