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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, 2018	Dec. 31, 2017	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Concentration Risk [Line Items]
Net revenues			$ 1,305.0	$ 1,394.6	$ 1,345.0	$ 1,328.0	$ 1,297.6	$ 1,238.7	$ 1,186.0	$ 1,132.6	$ 5,372.6	$ 4,854.9	$ 4,284.8
Accounts receivable	$ 549.6	$ 565.3	549.6				565.3				549.6	565.3
T. Rowe Price investment products [Member]
Concentration Risk [Line Items]
Net revenues											4,453.6	4,038.8	$ 3,569.3
Accounts receivable	$ 354.8	$ 371.9	$ 354.8				$ 371.9				$ 354.8	$ 371.9
Outside U.S. [Member] | Assets under management [Member] | Investment advisory clients [Member] | Geographic concentration [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	6.00%	6.00%

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