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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES. (Services Concentration and Receivables) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Dec. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Concentration Risk [Line Items]
Net revenues		$ 1,395.2	$ 1,345.0	$ 2,722.5	$ 2,673.0
Accounts receivable	$ 549.6	619.8		619.8
T. Rowe Price investment products [Member]
Concentration Risk [Line Items]
Net revenues		1,147.6	$ 1,114.8	2,241.0	$ 2,215.4
Accounts receivable	$ 354.8	$ 400.9		$ 400.9
Outside U.S. [Member] | Assets under management [Member] | Investment advisory clients [Member] | Geographic concentration [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	6.20%			6.40%

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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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