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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES. (Services Concentration and Receivables) (Details) - USD ($) $ in Millions			3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Concentration Risk [Line Items]
Net revenues			$ 1,327.3	$ 1,328.0
Accounts receivable	$ 604.6	$ 549.6	604.6
T. Rowe Price investment products [Member]
Concentration Risk [Line Items]
Net revenues			1,093.4	$ 1,100.6
Accounts receivable	$ 391.3	$ 354.8	$ 391.3
Outside U.S. [Member] | Assets under management [Member] | Investment advisory clients [Member] | Geographic concentration [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	6.40%	6.20%

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For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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