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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, 2018	Dec. 31, 2017	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2018	Sep. 30, 2017
Concentration Risk [Line Items]
Net revenues			$ 1,394.6	$ 1,297.6	$ 1,238.7	$ 1,186.0	$ 1,132.6	$ 4,067.6	$ 3,557.3
Accounts receivable	$ 583.1	$ 565.3	583.1	565.3				583.1
T. Rowe Price investment products [Member]
Concentration Risk [Line Items]
Net revenues			1,151.5		$ 1,031.8			3,366.9	$ 2,961.8
Accounts receivable	$ 380.6	$ 371.9	$ 380.6	$ 371.9				$ 380.6
Outside U.S. [Member] | Assets under management [Member] | Investment advisory clients [Member] | Geographic concentration [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	6.00%	5.80%

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