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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES. (Services Concentration and Receivables) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues | $ 1,468.7 | $ 1,426.7 | $ 1,395.2 | $ 1,327.3 | $ 1,305.0 | $ 1,394.6 | $ 1,345.0 | $ 1,328.0 | $ 5,617.9 | $ 5,372.6 | $ 4,854.9
Accounts receivable | 646.6 |  |  |  | 549.6 |  |  |  | 646.6 | 549.6 |
T. Rowe Price investment products |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 4,626.3 | 4,453.6 | $ 4,038.8
Accounts receivable | $ 424.8 |  |  |  | $ 354.8 |  |  |  | $ 424.8 | $ 354.8 |
Outside U.S. | Assets under management | Investment advisory clients | Geographic concentration |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  |  |  |  | 6.90% | 6.20% |

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