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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, 2019	Dec. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Concentration Risk [Line Items]
Net revenues			$ 1,426.7	$ 1,394.6	$ 4,149.2	$ 4,067.6
Accounts receivable	$ 620.6	$ 549.6	620.6		620.6
T. Rowe Price investment products [Member]
Concentration Risk [Line Items]
Net revenues			1,180.9	$ 1,151.5	3,421.9	$ 3,366.9
Accounts receivable	$ 405.3	$ 354.8	$ 405.3		$ 405.3
Outside U.S. [Member] | Assets under management [Member] | Investment advisory clients [Member] | Geographic concentration [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	6.50%	6.20%

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Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business.

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