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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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