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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 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 three and nine months ended September 30, 2016 and 2015. (See Note 17 - “Held for Sale and Discontinued Operations”).
|  | Three Months Ended |  | Nine Months Ended
|  | September 30, |  | September 30,
|  | 2016 |  | 2015 |  | 2016 |  | 2015
Basic and diluted earnings per share numerators (in millions): |  |  |  |  |  |  |  |  |  |
Net income (loss) from continuing operations attributable to White Mountains’s common shareholders |  | $ | 29.8 |  |  | $ | (65.4 | ) |  | $ | 24.2 |  |  | $ | (47.6 | )
Allocation of income for unvested restricted common shares |  | (.4 | ) |  | — |  |  | (.3 | ) |  | — |
Dividends declared on participating restricted common shares(1) |  | — |  |  | — |  |  | (.1 | ) |  | (.1 | )
Total allocation to restricted common shares |  | (.4 | ) |  | — |  |  | (.4 | ) |  | (.1 | )
Net income (loss) attributable to White Mountains’s common shareholders, net of restricted common share amounts |  | $ | 29.4 |  |  | $ | (65.4 | ) |  | $ | 23.8 |  |  | $ | (47.7 | )
Undistributed net earnings (in millions): |  |  |  |  |  |  |  |
Net income (loss) attributable to White Mountains’s common shareholders, net of restricted common share amounts |  | $ | 29.4 |  |  | $ | (65.4 | ) |  | $ | 23.8 |  |  | $ | (47.7 | )
Dividends declared net of restricted common share amounts(1) |  | — |  |  | — |  |  | (5.4 | ) |  | (5.9 | )
Total undistributed net earnings, net of restricted common share amounts |  | $ | 29.4 |  |  | $ | (65.4 | ) |  | $ | 18.4 |  |  | $ | (53.6 | )
Basic earnings per share denominators (in thousands): |  |  |  |  |  |  |  |
Total average common shares outstanding during the period |  | 4,867.4 |  |  | 5,890.1 |  |  | 5,166.6 |  |  | 5,951.1 |
Average unvested restricted shares(2) |  | (68.1 | ) |  | — |  |  | (62.9 | ) |  | — |
Basic earnings per share denominator |  | 4,799.3 |  |  | 5,890.1 |  |  | 5,103.7 |  |  | 5,951.1 |
Diluted earnings per share denominator (in thousands): |  |  |  |  |  |  |  |
Total average common shares outstanding during the period(3) |  | 4,879.4 |  |  | 5,890.1 |  |  | 5,174.8 |  |  | 5,951.1 |
Average unvested restricted common shares(2) |  | (68.1 | ) |  | — |  |  | (62.9 | ) |  | — |
Diluted earnings per share denominator(3) |  | 4,811.3 |  |  | 5,890.1 |  |  | 5,111.9 |  |  | 5,951.1 |
Basic earnings per share (in dollars): |  |  |  |  |  |  |  |
Net income (loss) attributable to White Mountains’s common shareholders |  | $ | 6.12 |  |  | $ | (11.10 | ) |  | $ | 4.67 |  |  | $ | (8.01 | )
Dividends declared and paid |  | — |  |  | — |  |  | (1.00 | ) |  | (1.00 | )
Undistributed earnings |  | $ | 6.12 |  |  | $ | (11.10 | ) |  | $ | 3.67 |  |  | $ | (9.01 | )
Diluted earnings per share (in dollars): |  |  |  |  |  |  |  |
Net income (loss) attributable to White Mountains’s common shareholders |  | $ | 6.11 |  |  | $ | (11.10 | ) |  | $ | 4.66 |  |  | $ | (8.01 | )
Dividends declared and paid |  | — |  |  | — |  |  | (1.00 | ) |  | (1.00 | )
Undistributed earnings |  | $ | 6.11 |  |  | $ | (11.10 | ) |  | $ | 3.66 |  |  | $ | (9.01 | )
(1) Restricted shares issued by White Mountains receive dividends, and therefore, are considered participating securities. (2) Restricted shares outstanding vest either in equal annual installments or upon a stated date. (See Note 15 - “Employee Share-Based Compensation Plans”). (3) The diluted earnings per share denominator for the three and nine months ended September 30, 2016 includes the impact of 120,000 common shares issuable upon exercise of the non-qualified options outstanding, which results in 11,943 and 8,208 incremental shares outstanding over the periods.

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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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