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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES. (Services Concentration and Receivables) (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Concentration Risk [Line Items] |  |  |  |  |  |
Net revenues |  |  | $ 1,595.8 | $ 1,426.7 | $ 4,473.8 | $ 4,149.2
Accounts receivable | $ 714.8 | $ 646.6 | 714.8 |  | 714.8 |
T. Rowe Price investment products |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |
Net revenues |  |  | 1,302.3 | $ 1,180.9 | 3,652.8 | $ 3,421.9
Accounts receivable | $ 442.0 | $ 424.8 | $ 442.0 |  | $ 442.0 |
Outside U.S. | Assets under management | Investment advisory clients | Geographic concentration |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |
Concentration risk, percentage | 8.70% | 6.90% |  |  |  |

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