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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2021
Earnings Per Share [Abstract] |
Schedule of earnings per share from continuing operations | The following table presents the Company’s computation of earnings per share from continuing operations for the years ended December 31, 2021, 2020 and 2019. See Note 21 — “Held for Sale and Discontinued Operations”.
|  | Year Ended December 31,
|  | 2021 |  | 2020 |  | 2019
Basic and diluted earnings per share numerators (in millions): |  |  |  |  |  |
Net income (loss) attributable to White Mountains’s common shareholders |  | $ | (275.4) |  |  | $ | 708.7 |  |  | $ | 414.5 |
Less: total (loss) income from discontinued operations, net of tax |  | 18.7 |  |  | (2.3) |  |  | .8 |
Net income (loss) from continuing operations attributable to White Mountains’s common shareholders |  | (294.1) |  |  | 711.0 |  |  | 413.7 |
Allocation of (earnings) losses to participating restricted common shares (1) |  | 3.5 |  |  | (9.3) |  |  | (5.3) |
Basic and diluted earnings (losses) per share numerators |  | $ | (290.6) |  |  | $ | 701.7 |  |  | $ | 408.4 |
Basic earnings per share denominators (in thousands): |  |  |  |  |  |
Total average common shares outstanding during the period |  | 3,079.0 |  |  | 3,122.2 |  |  | 3,181.6 |
Average unvested restricted common shares (2) |  | (36.5) |  |  | (40.8) |  |  | (40.5) |
Basic earnings (losses) per share denominator |  | 3,042.5 |  |  | 3,081.4 |  |  | 3,141.1 |
Diluted earnings per share denominator (in thousands): |  |  |  |  |  |
Total average common shares outstanding during the period |  | 3,079.0 |  |  | 3,122.2 |  |  | 3,181.6 |
Average unvested restricted common shares (2) |  | (36.5) |  |  | (40.8) |  |  | (40.5) |
Diluted earnings (losses) per share denominator |  | 3,042.5 |  |  | 3,081.4 |  |  | 3,141.1 |
Basic and diluted earnings per share (in dollars) - continuing operations: |  |  |  |  |  |
Distributed earnings - dividends declared and paid |  | $ | 1.00 |  |  | $ | 1.00 |  |  | $ | 1.00 |
Undistributed earnings (losses) |  | (96.53) |  |  | 226.72 |  |  | 129.02 |
Basic and diluted earnings (losses) per share |  | $ | (95.53) |  |  | $ | 227.72 |  |  | $ | 130.02 |
(1) Restricted shares issued by White Mountains receive dividends, and therefore, are considered participating securities. (2) Restricted shares outstanding vest upon a stated date. See Note 12 — “Employee Share-Based Incentive Compensation Plans”.
Schedule of undistributed net earnings (losses) from continuing operations | The following table presents the undistributed net earnings (losses) from continuing operations for the years ended December 31, 2021, 2020 and 2019. See Note 21 — “Held for Sale and Discontinued Operations”.
|  | Year Ended December 31,
Millions |  |  | 2021 |  | 2020 |  | 2019
Undistributed net earnings - continuing operations: |  |  |  |  |  |  |
Net income (loss) attributable to White Mountains’s common shareholders, net of restricted common share amounts |  |  | $ | (290.6) |  |  | $ | 701.7 |  |  | $ | 408.4 |
Dividends declared, net of restricted common share amounts (1) |  |  | (3.1) |  |  | (3.1) |  |  | (3.2) |
Total undistributed net earnings (losses), net of restricted common share amounts |  |  | $ | (293.7) |  |  | $ | 698.6 |  |  | $ | 405.2 |
(1) Restricted shares issued by White Mountains receive dividends, and are therefore considered participating securities.

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