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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES - Services Concentration and Receivables (Details) - USD ($) $ in Millions				3 Months Ended		6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Concentration Risk [Line Items]
Net revenues				$ 1,929.3	$ 1,415.4	$ 3,756.1	$ 2,878.0
Accounts receivable	$ 918.2		$ 863.1	918.2		918.2
T. Rowe Price investment products
Concentration Risk [Line Items]
Net revenues				1,571.9	$ 1,142.8	3,054.2	$ 2,350.5
Accounts receivable	$ 563.6		$ 523.4	$ 563.6		$ 563.6
Outside U.S. | Assets under management | Investment advisory clients | Geographic concentration
Concentration Risk [Line Items]
Concentration risk	9.00%	8.80%	9.30%

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