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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES - Services Concentration and Receivables (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Concentration Risk [Line Items]
Net revenues	$ 7,671.9	$ 6,206.7	$ 5,617.9
Accounts receivable	1,058.3	863.1
T. Rowe Price investment products
Concentration Risk [Line Items]
Net revenues	6,259.3	5,044.3	$ 4,626.3
Accounts receivable	$ 577.9	$ 523.4
Outside U.S. | Assets under management | Investment advisory clients | Geographic concentration
Concentration Risk [Line Items]
Concentration risk, percentage	9.90%	9.30%

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