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SUPPLEMENTARY QUARTERLY FINANCIAL DATA (Unaudited). (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 30, 2016 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  | $ 1,305.0 | $ 1,394.6 | $ 1,345.0 | $ 1,328.0 | $ 1,297.6 | $ 1,238.7 | $ 1,186.0 | $ 1,132.6 | $ 5,372.6 | $ 4,854.9 | $ 4,284.8
Net income |  | 272.0 | 581.6 | 459.6 | 455.5 | 386.6 | 404.2 | 390.0 | 400.4 | 1,768.7 | 1,581.2 | 1,254.0
Net income attributable to T. Rowe Price Group |  | $ 351.9 | $ 583.0 | $ 448.9 | $ 453.7 | $ 347.1 | $ 390.9 | $ 373.9 | $ 385.9 | $ 1,837.5 | $ 1,497.8 | $ 1,215.0
Basic earnings on common stock (in dollars per share) |  | $ 1.43 | $ 2.34 | $ 1.81 | $ 1.81 | $ 1.40 | $ 1.59 | $ 1.52 | $ 1.56 | $ 7.41 | $ 6.07 | $ 4.85
Diluted earnings per share (in dollars per share) |  | 1.41 | 2.30 | $ 1.77 | $ 1.77 | $ 1.37 | $ 1.56 | $ 1.50 | 1.54 | $ 7.27 | $ 5.97 | $ 4.75
Income tax provision related to the tax law changes |  |  |  | $ 20.8 |  | $ 71.1 |  |  |  | $ 20.8 |  |
Diluted earnings per share related to tax reform (in dollars per share) |  |  |  | $ 0.08 |  | $ 0.28 |  |  |  |  |  |
Daiwa SB Investments Ltd [Member] |  |  |  |  |  |  |  |  |  |  |  |
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 [Member] | Comptroller of Maryland [Member] |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
Dell appraisal rights matter [Member] |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Diluted earnings per share (in dollars per share) |  | $ 0.05 |  |  |  |  |  |  | $ 0.12 |  |  |
Insurance proceeds | $ 100.0 |  |  |  |  |  |  |  | $ 50.0 |  |  |
Nonrecurring charge related to Dell appraisal rights matter |  | $ (15.2) |  |  |  |  |  |  |  |  |  | $ 166.2

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