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Selected Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract] |
Selected Quartely Financial Data | SELECTED QUARTERLY FINANCIAL DATA (Unaudited) Selected quarterly financial data for 2012 and 2011 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 Esurance Sale and AutoOne Sale, the results of operations for Esurance and AutoOne 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 20).
|  | 2012 Three Months Ended |  | 2011 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 |  | $ | 566.4 |  |  | $ | 697.4 |  |  | $ | 542.3 |  |  | $ | 629.7 |  |  | $ | 593.4 |  |  | $ | 501.7 |  |  | $ | 552.4 |  |  | $ | 525.6 |
Expenses |  | 617.2 |  |  | 562.3 |  |  | 504.7 |  |  | 488.8 |  |  | 495.0 |  |  | 500.5 |  |  | 516.6 |  |  | 563.0 |
Pre-tax income (loss) |  | (50.8 | ) |  | 135.1 |  |  | 37.6 |  |  | 140.9 |  |  | 98.4 |  |  | 1.2 |  |  | 35.8 |  |  | (37.4 | )
Tax benefit (expense) |  | 101.0 |  |  | (47.8 | ) |  | (6.4 | ) |  | (31.1 | ) |  | 110.9 |  |  | 0.6 |  |  | (8.8 | ) |  | 7.3 |
Income (loss) from continuing operations |  | 50.2 |  |  | 87.3 |  |  | 31.2 |  |  | 109.8 |  |  | 209.3 |  |  | 1.8 |  |  | 27.0 |  |  | (30.1 | )
Income (loss) from discontinued operations, net of tax |  | 0.5 |  |  | (106.8 | ) |  | 0.5 |  |  | (9.2 | ) |  | 647.6 |  |  | (30.1 | ) |  | (2.4 | ) |  | 6.5 |
Non-controlling interest in consolidated subsidiaries |  | 12.0 |  |  | 30.9 |  |  | (12.1 | ) |  | (16.8 | ) |  | (20.3 | ) |  | 11.0 |  |  | (20.8 | ) |  | (11.4 | )
Equity in (loss) earnings of unconsolidated affiliates |  | 5.5 |  |  | 7.7 |  |  | 6.5 |  |  | 10.2 |  |  | (36.4 | ) |  | 1.5 |  |  | 7.9 |  |  | 6.8 |
Income (loss) attributable to White Mountains’ common shareholders |  | $ | 68.2 |  |  | $ | 19.1 |  |  | $ | 26.1 |  |  | $ | 94.0 |  |  | $ | 800.2 |  |  | $ | (15.8 | ) |  | $ | 11.7 |  |  | $ | (28.2 | )
Income (loss) attributable to White Mountains’ common shareholders: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Continuing operations |  | $ | 10.36 |  |  | $ | 19.11 |  |  | $ | 3.85 |  |  | $ | 13.85 |  |  | $ | 20.03 |  |  | $ | 1.80 |  |  | $ | 1.78 |  |  | $ | (4.33 | )
Discontinued operations |  | 0.07 |  |  | (16.21 | ) |  | 0.07 |  |  | (1.24 | ) |  | 85.01 |  |  | (3.80 | ) |  | (0.30 | ) |  | 0.82 |
Total consolidated operations |  | 10.43 |  |  | 2.90 |  |  | 3.92 |  |  | 12.61 |  |  | 105.04 |  |  | (2.00 | ) |  | 1.48 |  |  | (3.51 | )
Diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Continuing operations |  | $ | 10.36 |  |  | $ | 19.11 |  |  | $ | 3.85 |  |  | $ | 13.85 |  |  | $ | 20.03 |  |  | $ | 1.80 |  |  | $ | 1.78 |  |  | $ | (4.33 | )
Discontinued operations |  | 0.07 |  |  | (16.21 | ) |  | 0.07 |  |  | (1.24 | ) |  | 85.01 |  |  | (3.80 | ) |  | (0.30 | ) |  | 0.82 |
Total consolidated operations |  | 10.43 |  |  | 2.90 |  |  | 3.92 |  |  | 12.61 |  |  | 105.04 |  |  | (2.00 | ) |  | 1.48 |  |  | (3.51 | )
Adjusted book value per share |  | $ | 587.63 |  |  | $ | 573.66 |  |  | $ | 564.77 |  |  | $ | 565.38 |  |  | $ | 542.11 |  |  | $ | 436.18 |  |  | $ | 542.11 |  |  | $ | 446.70 |

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