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SUPPLEMENTARY QUARTERLY FINANCIAL DATA (Unaudited). (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Schedule of supplementary quarterly financial data |
| Net revenues(1) |  | Net income(2)(3)(4) |  | Net income attributable to T. Rowe Price Group(2)(3)(4) |  | Basic earnings on common stock(2)(3)(4)(5) |  | Diluted earnings on common stock(2)(3)(4)(5)
| (in millions) |  | (per share)
2018 |  |  |  |  |  |  |  |  |
1st quarter | $ | 1,328.0 |  |  | $ | 455.5 |  |  | $ | 453.7 |  |  | $ | 1.81 |  |  | $ | 1.77 |
2nd quarter | $ | 1,345.0 |  |  | $ | 459.6 |  |  | $ | 448.9 |  |  | $ | 1.81 |  |  | $ | 1.77 |
3rd quarter | $ | 1,394.6 |  |  | $ | 581.6 |  |  | $ | 583.0 |  |  | $ | 2.34 |  |  | $ | 2.30 |
4th quarter | $ | 1,305.0 |  |  | $ | 272.0 |  |  | $ | 351.9 |  |  | $ | 1.43 |  |  | $ | 1.41 |
2017 |  |  |  |  |  |  |  |  |
1st quarter | $ | 1,132.6 |  |  | $ | 400.4 |  |  | $ | 385.9 |  |  | $ | 1.56 |  |  | $ | 1.54 |
2nd quarter | $ | 1,186.0 |  |  | $ | 390.0 |  |  | $ | 373.9 |  |  | $ | 1.52 |  |  | $ | 1.50 |
3rd quarter | $ | 1,238.7 |  |  | $ | 404.2 |  |  | $ | 390.9 |  |  | $ | 1.59 |  |  | $ | 1.56 |
4th quarter | $ | 1,297.6 |  |  | $ | 386.6 |  |  | $ | 347.1 |  |  | $ | 1.40 |  |  | $ | 1.37 |
(1)Net revenues for 2017 have been adjusted to reflect the adoption of new revenue accounting guidance on January 1, 2018. We adopted the guidance using the retrospective method, which required adjustments to be reflected as of January 1, 2016. See the New Accounting Guidance section of Note 1 to the consolidated financial statements for more information about the adoption of this guidance. (2)During the first quarter of 2017, we recognized $50 million in insurance recoveries or $.12 in diluted earnings per share relating to the Dell matter. In the fourth quarter of 2018 we recognized a $15.2 million reduction in operating expenses, or $.05 in diluted earnings per share, upon recovering a portion of the payments we made to our clients in 2016. For more details related to the Dell appraisal rights matter, see Note 13 to the consolidated financial statements. (3)During the fourth quarter of 2017 and the second quarter of 2018, we recognized nonrecurring charges of $71.1 million and $20.8 million, respectively, or $.28 and $.08 in diluted earnings per share related to the U.S. tax law changes that were enacted on December 22, 2017. During the second quarter of 2018 we recognized an additional nonrecurring charge of $7.9 million, or $.03 in diluted earnings per share for the re-measurement of our deferred tax assets and liabilities to reflect the effect of Maryland state tax legislation enacted on April 24, 2018. See Note 8 to the consolidated financial statements for further details. (4)During the third quarter of 2018, we recognized a realized gain of $.27 in diluted earnings per share from the sale of our 10% holding in Daiwa SB Investments Ltd. (5)The sums of quarterly earnings per share may not equal annual earnings per share because the computations are done independently.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109225645&loc=d3e1280-108306 + Details
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