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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES. (Services Concentration and Receivables) (Details) - USD ($) $ in Millions |  |  | 3 Months Ended
--- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Concentration Risk [Line Items] |  |  |  |
Net revenues |  |  | $ 1,462.6 | $ 1,327.3
Accounts receivable | $ 585.3 | $ 646.6 | 585.3 |
T. Rowe Price investment products |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Net revenues |  |  | 1,207.7 | $ 1,093.4
Accounts receivable | $ 374.3 | $ 424.8 | $ 374.3 |
Outside U.S. | Assets under management | Investment advisory clients | Geographic concentration |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk, percentage | 7.40% | 6.90% |  |

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