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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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