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Earnings (Loss) Per Share (Tables) | 6 Months Ended
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Jun. 30, 2011
Earnings (Loss) Per Share |
Computation of earnings per share |
|  | Three Months Ended June 30, |  | Six Months Ended June 30, |
|  | 2011 |  | 2010 |  | 2011 |  | 2010 |
Basic and diluted earnings per share numerators (in millions): |  |  |  |  |  |  |  |  |
Net income (loss) attributable to White Mountains’ common shareholders |  | $ | 12.0 |  | $ | .7 |  | $ | (19.4 | ) | $ | (36.3 | )
Dividends declared and paid |  | — |  | — |  | (8.0 | ) | (8.8 | )
Undistributed earnings (loss) |  | $ | 12.0 |  | $ | .7 |  | $ | (27.4 | ) | $ | (45.1 | )
Basic earnings per share denominators (in thousands): |  |  |  |  |  |  |  |  |
Average common shares outstanding during the period |  | 7,886 |  | 8,571 |  | 7,930 |  | 8,656 |
Average unvested restricted shares (1) |  | 73 |  | 100 |  | 65 |  | 96 |
Basic earnings (loss) per share denominator |  | 7,959 |  | 8,671 |  | 7,995 |  | 8,752 |
Diluted earnings per share denominator (in thousands): |  |  |  |  |  |  |  |  |
Average common shares outstanding during the period |  | 7,886 |  | 8,571 |  | 7,930 |  | 8,656 |
Average unvested restricted shares (1) |  | 73 |  | 100 |  | 65 |  | 96 |
Average outstanding dilutive options to acquire common shares (2) |  | — |  | — |  | — |  | — |
Diluted earnings (loss) per share denominator |  | 7,959 |  | 8,671 |  | 7,995 |  | 8,752 |
Basic earnings per share (in dollars): |  |  |  |  |  |  |  |  |
Net income (loss) attributable to White Mountains’ common shareholders |  | $ | 1.51 |  | $ | .08 |  | $ | (2.42 | ) | $ | (4.15 | )
Dividends declared and paid |  | — |  | — |  | (1.00 | ) | (1.00 | )
Undistributed earnings (loss) per share |  | $ | 1.51 |  | $ | .08 |  | $ | (3.42 | ) | $ | (5.15 | )
Diluted earnings per share (in dollars) |  |  |  |  |  |  |  |  |
Net income (loss) attributable to White Mountains’ common shareholders |  | $ | 1.51 |  | $ | .08 |  | $ | (2.42 | ) | $ | (4.15 | )
Dividends declared and paid |  | — |  | — |  | (1.00 | ) | (1.00 | )
Undistributed earnings (loss) per share |  | $ | 1.51 |  | $ | .08 |  | $ | (3.42 | ) | $ | (5.15 | )
(1) Restricted shares outstanding vest either in equal annual installments, upon a stated date or upon the occurrence of a specified event (see Note 12). (2) The diluted earnings (loss) per share denominator for the three and six months ended June 30, 2010 does not include common shares issuable upon exercise of incentive options as they are anti-dilutive to the calculation.

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- Definition Tabular disclosure of the numerators and the denominators of the basic and diluted per-share (or per-unit) computations for income from continuing operations, including the effect that has been given to preferred dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 260 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (a) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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