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Selected Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information | Selected quarterly financial data for 2016 and 2015 is shown in the following table. The quarterly financial data includes, in the opinion of management, all recurring adjustments necessary for a fair presentation of the results of operations for the interim periods. As a result of the sale of Tranzact, Sirius, and Esurance and the Runoff Business, the results of operations for Tranzact, Sirius, Esurance and the Runoff Business have been classified as discontinued operations and are now presented, net of related income taxes, as such in the statement of comprehensive income. Prior year amounts have been reclassified to conform to the current period’s presentation. See Note 22 — “Held for Sale and Discontinued Operations”.
|  | 2016 Three Months Ended |  | 2015 Three Months Ended
Millions, except per share amounts |  | Dec. 31 |  | Sept. 30 |  | June 30 |  | Mar. 31 |  | Dec. 31 |  | Sept. 30 |  | June 30 |  | Mar. 31
Revenues |  | $ | 268.2 |  |  | $ | 365.0 |  |  | $ | 358.2 |  |  | $ | 369.3 |  |  | $ | 602.6 |  |  | $ | 296.1 |  |  | $ | 368.7 |  |  | $ | 354.3 |
Expenses |  | 335.0 |  |  | 345.0 |  |  | 360.3 |  |  | 360.8 |  |  | 356.3 |  |  | 383.0 |  |  | 373.8 |  |  | 351.3 |
Pre-tax (loss) income |  | (66.8 | ) |  | 20.0 |  |  | (2.1 | ) |  | 8.5 |  |  | 246.3 |  |  | (86.9 | ) |  | (5.1 | ) |  | 3.0 |
Tax benefit (expense) |  | 23.0 |  |  | 6.7 |  |  | 6.0 |  |  | 9.7 |  |  | 1.0 |  |  | 1.6 |  |  | 2.2 |  |  | (4.6 | )
(Loss) income from continuing operations |  | (43.8 | ) |  | 26.7 |  |  | 3.9 |  |  | 18.2 |  |  | 247.3 |  |  | (85.3 | ) |  | (2.9 | ) |  | (1.6 | )
(Loss) income from discontinued operations, net of tax |  | (6.8 | ) |  | 61.9 |  |  | 358.6 |  |  | 1.1 |  |  | 19.6 |  |  | 6.5 |  |  | (.5 | ) |  | 71.3 |
Non-controlling interest in consolidated subsidiaries |  | 17.3 |  |  | 3.1 |  |  | (21.4 | ) |  | (6.3 | ) |  | (6.1 | ) |  | 16.0 |  |  | .9 |  |  | 7.3 |
Equity in earnings of unconsolidated affiliates |  | — |  |  | — |  |  | — |  |  | — |  |  | 7.1 |  |  | 3.9 |  |  | 6.8 |  |  | 7.3 |
(Loss) income attributable to White Mountains’s common shareholders |  | $ | (33.3 | ) |  | $ | 91.7 |  |  | $ | 341.1 |  |  | $ | 13.0 |  |  | $ | 267.9 |  |  | $ | (58.9 | ) |  | $ | 4.3 |  |  | $ | 84.3 |
(Loss) income attributable to White Mountains’s common shareholders per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Continuing operations |  | $ | (5.81 | ) |  | $ | 6.12 |  |  | $ | (3.44 | ) |  | $ | 2.51 |  |  | $ | 43.82 |  |  | $ | (11.10 | ) |  | $ | 0.80 |  |  | $ | 1.76 |
Discontinued operations |  | (1.49 | ) |  | 12.72 |  |  | 70.37 |  |  | (.17 | ) |  | 3.46 |  |  | 1.09 |  |  | (.08 | ) |  | 12.33 |
Total consolidated operations |  | $ | (7.30 | ) |  | $ | 18.84 |  |  | $ | 66.93 |  |  | $ | 2.34 |  |  | $ | 47.28 |  |  | $ | (10.01 | ) |  | $ | 0.72 |  |  | $ | 14.09 |
Diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Continuing operations |  | $ | (5.81 | ) |  | $ | 6.11 |  |  | $ | (3.43 | ) |  | $ | 2.51 |  |  | $ | 43.79 |  |  | $ | (11.10 | ) |  | $ | 0.80 |  |  | $ | 1.76 |
Discontinued operations |  | (1.49 | ) |  | 12.69 |  |  | 70.22 |  |  | (.17 | ) |  | 3.46 |  |  | 1.09 |  |  | (.08 | ) |  | 12.33 |
Total consolidated operations |  | $ | (7.30 | ) |  | $ | 18.80 |  |  | $ | 66.79 |  |  | $ | 2.34 |  |  | $ | 47.25 |  |  | $ | (10.01 | ) |  | $ | 0.72 |  |  | $ | 14.09 |

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1280-108306 + Details
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