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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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Concentration Risk [Line Items]
Net revenues	$ 1,468.7	$ 1,426.7	$ 1,395.2	$ 1,327.3	$ 1,305.0	$ 1,394.6	$ 1,345.0	$ 1,328.0	$ 5,617.9	$ 5,372.6	$ 4,854.9
Accounts receivable	646.6				549.6				646.6	549.6
T. Rowe Price investment products
Concentration Risk [Line Items]
Net revenues									4,626.3	4,453.6	$ 4,038.8
Accounts receivable	$ 424.8				$ 354.8				$ 424.8	$ 354.8
Outside U.S. | Assets under management | Investment advisory clients | Geographic concentration
Concentration Risk [Line Items]
Concentration risk, percentage									6.90%	6.20%

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