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Discontinued Operations (Earnings Per Share) (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Discontinued Operations |  |  |  |  |  |  |  |
Net income (loss) from continuing operations attributable to White Mountains’ common shareholders | $ 125.9 |  | $ 14.3 |  | $ 254.6 |  | $ (6.3) |
Basic and diluted earnings (loss) per share numerators (in millions): |  |  |  |  |  |  |  |
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest | (15.8) |  | (12.0) |  | (24.5) |  | (7.8) |
Income (Loss) Allocated to Participating Unvested Restricted Common Shares | (1.8) |  | (0.1) |  | (3.3) |  | 0.1 |
Net income attributable to White Mountains' common shareholders, net of restricted common share amounts | 19.1 |  | (15.8) |  | 139.2 |  | (32.3) |
Basic earnings per share denominators (in thousands): |  |  |  |  |  |  |  |
Total average common shares outstanding during the period | 6,590,400 |  | 7,919,300 |  | 6,885,900 |  | 7,970,000 |
Average unvested restricted common shares | (96,500) | [1],[2] | (73,500) | [1],[2] | (89,500) | [1],[2] | (68,000) | [1],[2]
Basic earnings (loss) per share denominator | 6,493,900 |  | 7,845,800 |  | 6,796,400 |  | 7,902,000 |
Diluted earnings per share denominator (in thousands): |  |  |  |  |  |  |  |
Total average common shares outstanding during the period | 6,590,400 |  | 7,919,300 |  | 6,885,900 |  | 7,970,000 |
Average unvested restricted common shares | (96,500) | [1],[2] | (73,500) | [1],[2] | (89,500) | [1],[2] | (68,000) | [1],[2]
Weighted Average Number Diluted Shares Outstanding Adjustment | 0 | [2] | 0 | [2] | 0 | [2] | 0 | [2]
Diluted earnings (loss) per share denominator | 6,493,900 |  | 7,845,800 |  | 6,796,400 |  | 7,902,000 |
Segment, Discontinued Operations [Member] |  |  |  |  |  |  |  |
Discontinued Operations |  |  |  |  |  |  |  |
Net income (loss) from continuing operations attributable to White Mountains’ common shareholders | (106.8) |  | (30.2) |  | (115.5) |  | (26.0) |
Basic and diluted earnings (loss) per share numerators (in millions): |  |  |  |  |  |  |  |
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest | (15.8) |  | (12.0) |  | (24.5) |  | (7.8) |
Income (Loss) Allocated to Participating Unvested Restricted Common Shares | 1.5 |  | 0.3 |  | 1.5 |  | 0.2 |
Net income attributable to White Mountains' common shareholders, net of restricted common share amounts | $ (105.3) | [3] | $ (29.9) | [3] | $ (114.0) | [3] | $ (25.8) | [3]
Basic earnings per share denominators (in thousands): |  |  |  |  |  |  |  |
Total average common shares outstanding during the period | 6,590,400 |  | 7,919,300 |  | 6,885,900 |  | 7,970,000 |
Average unvested restricted common shares | (96,500) | [4] | (73,500) | [4] | (89,500) | [4] | (68,000) | [4]
Basic earnings (loss) per share denominator |  |  |  |  | 6,796,400 |  | 7,902,000 |
Diluted earnings per share denominator (in thousands): |  |  |  |  |  |  |  |
Total average common shares outstanding during the period | 6,590,400 |  | 7,919,300 |  | 6,885,900 |  | 7,970,000 |
Average unvested restricted common shares | (96,500) | [4] | (73,500) | [4] | (89,500) | [4] | (68,000) | [4]
Weighted Average Number Diluted Shares Outstanding Adjustment | 0 |  | 0 |  | 0 |  | 0 |
Diluted earnings (loss) per share denominator | 6,493,900 |  | 7,845,800 |  | 6,796,400 |  | 7,902,000 |
Basic and diluted earnings per share (in dollars per share): | $ (16.21) |  | $ (3.81) |  | $ (16.77) |  | $ (3.26) |
[1] | (2) Restricted shares outstanding vest either in equal annual installments or upon a stated date (see Note 12).
[2] | (3) The diluted earnings (loss) per share denominator for the three and nine months ended September 30, 2012 and 2011 do not include common shares issuable upon exercise of the Non-Qualified Options as they are anti-dilutive to the calculation.
[3] | (2) Net loss attributable to White Mountains’ common shareholders, net of restricted share amounts, is equal to undistributed loss for the three and nine months ended September 30, 2012 and 2011.
[4] | (1) Restricted shares issued by White Mountains contain dividend participation features, and therefore, are considered participating securities.

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- Definition The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References No definition available. + Details
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- Definition Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 47 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.14) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 43 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.12) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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- Definition Represents Net income from continuing operations attributable to White Mountains common shareholders. + References No definition available. + Details
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