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SUPPLEMENTARY QUARTERLY FINANCIAL DATA (Unaudited). (Details) - USD ($) $ / shares in Units, $ 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
Unusual or Infrequent Item, or Both [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
Net income | 593.9 | 545.1 | 555.9 | 554.0 | 272.0 | 581.6 | 459.6 | 455.5 | 2,248.9 | 1,768.7 | 1,581.2
Net income attributable to T. Rowe Price Group | $ 545.3 | $ 545.9 | $ 527.5 | $ 512.6 | $ 351.9 | $ 583.0 | $ 448.9 | $ 453.7 | $ 2,131.3 | $ 1,837.5 | $ 1,497.8
Basic earnings on common stock (in dollars per share) | $ 2.27 | $ 2.26 | $ 2.18 | $ 2.11 | $ 1.43 | $ 2.34 | $ 1.81 | $ 1.81 | $ 8.82 | $ 7.41 | $ 6.07
Diluted earnings per share (in dollars per share) | $ 2.24 | $ 2.23 | $ 2.15 | $ 2.09 | 1.41 | 2.30 | $ 1.77 | $ 1.77 | $ 8.70 | $ 7.27 | $ 5.97
Nonrecurring recoveries related to Dell appraisal rights matter |  |  |  |  |  |  |  |  | $ 0.0 | $ (15.2) | $ (50.0)
Income tax provision related to the tax law changes |  |  |  |  |  |  | $ 20.8 |  |  | 20.8 |
Diluted earnings per share related to tax reform (in dollars per share) |  |  |  |  |  |  | $ 0.08 |  |  |  |
Daiwa SB Investments Ltd |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |
Diluted earnings per share (in dollars per share) |  |  |  |  |  | $ 0.27 |  |  |  |  |
Ownership interest in investments (as percent) |  |  |  |  |  | 10.00% |  |  |  |  |
State and local jurisdiction | Comptroller of Maryland |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |
Diluted earnings per share (in dollars per share) |  |  |  |  |  |  | $ 0.03 |  |  |  |
Nonrecurring income tax charge due to Maryland state tax legislation |  |  |  |  |  |  | $ 7.9 |  |  | $ 7.9 |
Dell appraisal rights matter |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |
Diluted earnings per share (in dollars per share) |  |  |  |  | $ 0.05 |  |  |  |  |  |
Nonrecurring recoveries related to Dell appraisal rights matter |  |  |  |  | $ (15.2) |  |  |  |  |  |

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