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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, 2021	Mar. 31, 2020	Dec. 31, 2020
Concentration Risk [Line Items]
Net revenues	$ 1,826.8	$ 1,462.6
Accounts receivable	885.9		$ 863.1
T. Rowe Price investment products
Concentration Risk [Line Items]
Net revenues	1,482.3	$ 1,207.7
Accounts receivable	$ 540.0		$ 523.4
Outside U.S. | Assets under management | Investment advisory clients | Geographic concentration
Concentration Risk [Line Items]
Concentration risk, percentage	8.80%		9.30%

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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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