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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES - Services Concentration and Receivables (Details) - USD ($) $ in Millions				3 Months Ended		9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Concentration Risk [Line Items]
Net revenues				$ 1,954.1	$ 1,595.8	$ 5,710.2	$ 4,473.8
Accounts receivable	$ 941.6		$ 863.1	941.6		941.6
T. Rowe Price investment products
Concentration Risk [Line Items]
Net revenues				1,599.5	$ 1,302.3	4,653.7	$ 3,652.8
Accounts receivable	$ 581.6		$ 523.4	$ 581.6		$ 581.6
Investment advisory clients | Outside U.S. | Assets under management | Geographic concentration
Concentration Risk [Line Items]
Concentration risk	8.80%	9.00%	9.30%

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