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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2012
Earnings Per Share [Abstract] |
Computation of earnings per share | The following table outlines the Company’s computation of earnings per share for the years ended December 31, 2012, 2011 and 2010:
| Year Ended December 31,
| 2012 |  | 2011 |  | 2010
Basic and diluted earnings per share numerators (in millions): |  |  |  |  |  |  |  |
Net income attributable to White Mountains’ common shareholders | $ | 322.4 |  |  | $ | 146.3 |  |  | $ | 116.6 |
Allocation of income for participating unvested restricted common shares | (4.3 | ) |  | (1.2 | ) |  | (1.3 | )
Dividends declared on participating restricted common shares (1) | (.1 | ) |  | (.1 | ) |  | (.1 | )
Total allocation to restricted common shares | (4.4 | ) |  | (1.3 | ) |  | (1.4 | )
Net income attributable to White Mountains’ common shareholders, net of restricted share amounts | $ | 318.0 |  |  | $ | 145.0 |  |  | $ | 115.2 |
Undistributed net earnings: |  |  |  |  |  |
Net income attributable to White Mountains’ common shareholders, net of restricted common share amounts | $ | 318.0 |  |  | $ | 145.0 |  |  | $ | 115.2 |
Dividends declared net of restricted common share amounts (1) | (6.5 | ) |  | (7.9 | ) |  | (8.7 | )
Total undistributed net earnings, net of restricted common share amounts | $ | 311.5 |  |  | $ | 137.1 |  |  | $ | 106.5 |
Basic earnings per share denominators (in thousands): |  |  |  |  |  |
Total average common shares outstanding during the period | 6,799.8 |  |  | 7,881.0 |  |  | 8,548.4 |
Average unvested restricted common shares (2) | (91.1 | ) |  | (69.4 | ) |  | (97.3 | )
Basic earnings per share denominator | 6,708.7 |  |  | 7,811.6 |  |  | 8,451.1 |
Diluted earnings per share denominator (in thousands): |  |  |  |  |  |
Total average common shares outstanding during the period | 6,799.8 |  |  | 7,881.0 |  |  | 8,548.4 |
Average unvested restricted common shares (2) | (91.1 | ) |  | (69.4 | ) |  | (97.3 | )
Average outstanding dilutive options to acquire common shares (3) | — |  |  | — |  |  | .5 |
Diluted earnings per share denominator | 6,708.7 |  |  | 7,811.6 |  |  | 8,451.6 |
Basic earnings per share (in dollars): |  |  |  |  |  |
Net income attributable to White Mountains’ common shareholders | $ | 47.41 |  |  | $ | 18.56 |  |  | $ | 13.63 |
Dividends declared and paid | (1.00 | ) |  | (1.00 | ) |  | (1.00 | )
Undistributed earnings | $ | 46.41 |  |  | $ | 17.56 |  |  | $ | 12.63 |
Diluted earnings per share (in dollars) |  |  |  |  |  |
Net income attributable to White Mountains’ common shareholders | $ | 47.41 |  |  | $ | 18.56 |  |  | $ | 13.63 |
Dividends declared and paid | (1.00 | ) |  | (1.00 | ) |  | (1.00 | )
Undistributed earnings | $ | 46.41 |  |  | $ | 17.56 |  |  | $ | 12.63 |
(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 11).
(3) | The diluted earnings per share denominator for the year ended December 31, 2010 includes 1,200 common shares issuable upon exercise of incentive options at an average strike price of $189.31 per common share. The non-qualified options were not included in the diluted earnings per share denominator for any of the periods presented as their inclusion would be anti-dilutive.

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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