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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES. (Services Concentration and Receivables) (Details) - USD ($) $ in Millions			3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017
Concentration Risk [Line Items]
Net revenues			$ 1,328.0	$ 1,297.6	$ 1,238.7	$ 1,186.0	$ 1,132.6
Accounts receivable	$ 593.6	$ 565.3	593.6	565.3
T. Rowe Price investment products [Member]
Concentration Risk [Line Items]
Net revenues			1,100.6				$ 945.0
Accounts receivable	$ 388.8	$ 365.3	$ 388.8	$ 365.3
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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