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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2016
Earnings Per Share [Abstract] |
Computation of earnings per share | The following table outlines the Company’s computation of earnings per share from continuing operations for the years ended December 31, 2016, 2015 and 2014. See Note 22 — “Held for Sale and Discontinued Operations” for earnings per share amounts for discontinued operations.
|  | Year Ended December 31,
|  | 2016 |  | 2015 |  | 2014
Basic and diluted earnings per share numerators (in millions): |  |  |  |  |  |  |  |  |
Net income from continuing operations attributable to White Mountains’s common shareholders |  | $ | (2.3 | ) |  | $ | 200.7 |  |  | $ | 53.2 |
Allocation of income for unvested restricted common shares(1) |  | — |  |  | (2.3 | ) |  | (0.7 | )
Dividends declared on participating restricted common shares(1) |  | — |  |  | (.1 | ) |  | (.1 | )
Total allocation to restricted common shares |  | — |  |  | (2.4 | ) |  | (0.8 | )
Net income attributable to White Mountains’s common shareholders, net of restricted share amounts |  | $ | (2.3 | ) |  | $ | 198.3 |  |  | $ | 52.4 |
Undistributed net earnings (in millions): |  |  |  |  |  |
Net income attributable to White Mountains’s common shareholders, net of restricted common share amounts |  | $ | (2.3 | ) |  | $ | 198.3 |  |  | $ | 52.4 |
Dividends declared net of restricted common share amounts(1) |  | (5.4 | ) |  | (5.9 | ) |  | (6.1 | )
Total undistributed net earnings, net of restricted common share amounts |  | $ | (7.7 | ) |  | $ | 192.4 |  |  | $ | 46.3 |
Basic earnings per share denominators (in thousands): |  |  |  |  |  |
Total average common shares outstanding during the period |  | 5,014.9 |  |  | 5,879.2 |  |  | 6,104.9 |
Average unvested restricted common shares(2) |  | (64.8 | ) |  | (68.0 | ) |  | (78.9 | )
Basic earnings per share denominator |  | 4,950.1 |  |  | 5,811.2 |  |  | 6,026.0 |
Diluted earnings per share denominator (in thousands): |  |  |  |  |  |
Total average common shares outstanding during the period |  | 5,018.1 |  |  | 5,879.2 |  |  | 6,104.9 |
Average unvested restricted common shares(2) |  | (64.8 | ) |  | (68.0 | ) |  | (78.9 | )
Diluted earnings per share denominator(3) |  | 4,953.3 |  |  | 5,811.2 |  |  | 6,026.0 |
Basic earnings per share (in dollars): |  |  |  |  |  |
Net income attributable to White Mountains’s common shareholders |  | $ | (0.47 | ) |  | $ | 34.12 |  |  | $ | 8.70 |
Dividends declared and paid |  | (1.00 | ) |  | (1.00 | ) |  | (1.00 | )
Undistributed (loss) earnings |  | $ | (1.47 | ) |  | $ | 33.12 |  |  | $ | 7.70 |
Diluted earnings per share (in dollars) |  |  |  |  |  |
Net income attributable to White Mountains’s common shareholders |  | $ | (0.47 | ) |  | $ | 34.12 |  |  | $ | 8.70 |
Dividends declared and paid |  | (1.00 | ) |  | (1.00 | ) |  | (1.00 | )
Undistributed (loss) earnings |  | $ | (1.47 | ) |  | $ | 33.12 |  |  | $ | 7.70 |
(1) | Restricted shares issued by White Mountains receive dividends, and therefore, are considered participating securities.
(2) | Restricted common shares outstanding vest either in equal annual installments or upon a stated date. See Note 13 — “Employee Share-Based Incentive Compensation Plans”.
(3) | The diluted earnings (loss) per share denominator for the year ended December 31, 2016, includes the impact of 40,000 common shares issuable upon exercise of the non-qualified options outstanding, which results in 3,217 incremental shares outstanding over the period. Prior periods do not include the impact of 125,000 common shares issuable upon exercise of the non-qualified options outstanding as they are anti-dilutive to the calculation.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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