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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES. (Services Concentration and Receivables) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Concentration Risk [Line Items] |  |  |
Net revenues | $ 1,826.8 | $ 1,462.6 |
Accounts receivable | 885.9 |  | $ 863.1
T. Rowe Price investment products |  |  |
Concentration Risk [Line Items] |  |  |
Net revenues | 1,482.3 | $ 1,207.7 |
Accounts receivable | $ 540.0 |  | $ 523.4
Outside U.S. | Assets under management | Investment advisory clients | Geographic concentration |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 8.80% |  | 9.30%

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