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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES. (Services Concentration and Receivables) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Concentration Risk [Line Items]
Net revenues	$ 1,732.9	$ 1,595.8	$ 1,415.4	$ 1,462.6	$ 1,468.7	$ 1,426.7	$ 1,395.2	$ 1,327.3	$ 6,206.7	$ 5,617.9	$ 5,372.6
Accounts receivable	863.1				646.6				863.1	646.6
Seed capital
Concentration Risk [Line Items]
Net revenues									5,044.3	4,626.3	$ 4,453.6
Accounts receivable	$ 523.4				$ 424.8				$ 523.4	$ 424.8
Outside U.S. | Assets under management | Investment advisory clients | Geographic concentration
Concentration Risk [Line Items]
Concentration risk, percentage									9.30%	6.90%

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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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