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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2017
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 six months ended June 30, 2017 and 2016. See Note 15 — “Held for Sale and Discontinued Operations”.
|  | Three Months Ended |  | Six Months Ended
|  | June 30, |  | June 30,
|  | 2017 |  | 2016 |  | 2017 |  | 2016
Basic and diluted earnings per share numerators (in millions): |  |  |  |  |  |  |  |  |  |
Net income (loss) from continuing operations attributable to White Mountains’s common shareholders |  | $ | 12.7 |  |  | $ | (42.5 | ) |  | $ | 15.7 |  |  | $ | (76.9 | )
Allocation of income for unvested restricted common shares |  | (.2 | ) |  | .6 |  |  | (.1 | ) |  | .9 |
Dividends declared on participating restricted common shares(1) |  | — |  |  | — |  |  | (.1 | ) |  | (.1 | )
Total allocation to restricted common shares |  | (.2 | ) |  | .6 |  |  | (.2 | ) |  | .8 |
Net income (loss) attributable to White Mountains’s common shareholders, net of restricted common share amounts |  | $ | 12.5 |  |  | $ | (41.9 | ) |  | $ | 15.5 |  |  | $ | (76.1 | )
Undistributed net earnings (in millions): |  |  |  |  |  |  |  |
Net income (loss) attributable to White Mountains’s common shareholders, net of restricted common share amounts |  | $ | 12.5 |  |  | $ | (41.9 | ) |  | $ | 15.5 |  |  | $ | (76.1 | )
Dividends declared net of restricted common share amounts(1) |  | — |  |  | — |  |  | (4.5 | ) |  | (5.9 | )
Total undistributed net earnings (loss), net of restricted common share amounts |  | $ | 12.5 |  |  | $ | (41.9 | ) |  | $ | 11.0 |  |  | $ | (82.0 | )
Basic earnings per share denominators (in thousands): |  |  |  |  |  |  |  |
Total average common shares outstanding during the period |  | 4,572.1 |  |  | 5,096.1 |  |  | 4,568.4 |  |  | 5,317.8 |
Average unvested restricted common shares(2) |  | (57.2 | ) |  | (66.5 | ) |  | (54.9 | ) |  | (60.2 | )
Basic earnings per share denominator |  | 4,514.9 |  |  | 5,029.6 |  |  | 4,513.5 |  |  | 5,257.6 |
Diluted earnings per share denominator (in thousands): |  |  |  |  |  |  |  |
Total average common shares outstanding during the period(3) |  | 4,572.1 |  |  | 5,107.0 |  |  | 4,568.4 |  |  | 5,324.0 |
Average unvested restricted common shares(2) |  | (57.2 | ) |  | (66.5 | ) |  | (54.9 | ) |  | (60.2 | )
Diluted earnings per share denominator(3) |  | 4,514.9 |  |  | 5,040.5 |  |  | 4,513.5 |  |  | 5,263.8 |
Basic earnings per share (in dollars): |  |  |  |  |  |  |  |
Net income (loss) attributable to White Mountains’s common shareholders |  | $ | 2.78 |  |  | $ | (8.34 | ) |  | $ | 3.42 |  |  | $ | (14.47 | )
Dividends declared and paid |  | — |  |  | — |  |  | (1.00 | ) |  | (1.00 | )
Undistributed earnings (loss) |  | $ | 2.78 |  |  | $ | (8.34 | ) |  | $ | 2.42 |  |  | $ | (15.47 | )
Diluted earnings per share (in dollars): |  |  |  |  |  |  |  |
Net income (loss) attributable to White Mountains’s common shareholders |  | $ | 2.78 |  |  | $ | (8.32 | ) |  | $ | 3.42 |  |  | $ | (14.46 | )
Dividends declared and paid |  | — |  |  | — |  |  | (1.00 | ) |  | (1.00 | )
Undistributed earnings (loss) |  | $ | 2.78 |  |  | $ | (8.32 | ) |  | $ | 2.42 |  |  | $ | (15.46 | )
(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 13 — “Employee Share-Based Compensation Plans”. (3) The diluted earnings per share denominator for the three and six months ended June 30, 2016 includes the impact of 120,000 common shares issuable upon exercise of the non-qualified options outstanding, which resulted in 10,863 and 6,194 incremental shares outstanding over the period.

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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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