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Selected Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract] |
Selected Quartely Financial Data (Unaudited) | SELECTED QUARTERLY FINANCIAL DATA (Unaudited) The following table presents selected quarterly financial data for 2019 and 2018. 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. Prior year amounts have been reclassified to conform to the current period’s presentation. Prior year amounts have also been adjusted for the impact of White Mountains’s financial statement revisions.
|  | 2019 Three Months Ended |  | 2018 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 |  | $ | 175.3 |  |  | $ | 155.5 |  |  | $ | 129.0 |  |  | $ | 433.6 |  |  | $ | 6.0 |  |  | $ | 198.7 |  |  | $ | 122.3 |  |  | $ | 42.1 |
Expenses |  | 118.8 |  |  | 104.4 |  |  | 113.2 |  |  | 151.9 |  |  | 150.1 |  |  | 154.4 |  |  | 134.7 |  |  | 108.1 |
Pre-tax income (loss) |  | 56.5 |  |  | 51.1 |  |  | 15.8 |  |  | 281.7 |  |  | (144.1 | ) |  | 44.3 |  |  | (12.4 | ) |  | (66.0 | )
Tax (expense) benefit |  | (10.4 | ) |  | (8.8 | ) |  | .1 |  |  | (10.2 | ) |  | 3.6 |  |  | 3.6 |  |  | (2.5 | ) |  | (.7 | )
Income (loss) from continuing operations |  | 46.1 |  |  | 42.3 |  |  | 15.9 |  |  | 271.5 |  |  | (140.5 | ) |  | 47.9 |  |  | (14.9 | ) |  | (66.7 | )
Net (loss) gain from discontinued operations, net of tax (1) |  | (.8 | ) |  | .9 |  |  | — |  |  | .7 |  |  | — |  |  | (17.3 | ) |  | — |  |  | .1 |
Non-controlling interest in consolidated subsidiaries |  | 15.6 |  |  | 5.5 |  |  | 4.6 |  |  | 12.2 |  |  | 3.0 |  |  | 10.2 |  |  | 18.4 |  |  | 18.6 |
Income (loss) attributable to White Mountains’s common shareholders |  | $ | 60.9 |  |  | $ | 48.7 |  |  | $ | 20.5 |  |  | $ | 284.4 |  |  | $ | (137.5 | ) |  | $ | 40.8 |  |  | $ | 3.5 |  |  | $ | (48.0 | )
Income (loss) attributable to White Mountains’s common shareholders per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Continuing operations |  | $ | 19.37 |  |  | $ | 15.01 |  |  | $ | 6.44 |  |  | $ | 89.42 |  |  | $ | (43.24 | ) |  | $ | 18.27 |  |  | $ | 1.02 |  |  | $ | (12.85 | )
Discontinued operations |  | (.25 | ) |  | .28 |  |  | — |  |  | .22 |  |  | — |  |  | (5.44 | ) |  | — |  |  | .03 |
Total consolidated operations |  | $ | 19.12 |  |  | $ | 15.29 |  |  | $ | 6.44 |  |  | $ | 89.64 |  |  | $ | (43.24 | ) |  | $ | 12.83 |  |  | $ | 1.02 |  |  | $ | (12.82 | )
Diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Continuing operations |  | $ | 19.37 |  |  | $ | 15.01 |  |  | $ | 6.44 |  |  | $ | 89.42 |  |  | $ | (43.24 | ) |  | $ | 18.27 |  |  | $ | 1.02 |  |  | $ | (12.85 | )
Discontinued operations |  | (.25 | ) |  | .28 |  |  | — |  |  | .22 |  |  | — |  |  | (5.44 | ) |  | — |  |  | .03 |
Total consolidated operations |  | $ | 19.12 |  |  | $ | 15.29 |  |  | $ | 6.44 |  |  | $ | 89.64 |  |  | $ | (43.24 | ) |  | $ | 12.83 |  |  | $ | 1.02 |  |  | $ | (12.82 | )
(1) During 2019 and 2018, net (loss) gain from discontinued operations arose from the tax contingency on the sale of Sirius Group. See Note 19 — “Commitments and Contingencies”.

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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