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Discontinued Operations (Details 3) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended
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Mar. 31, 2012 | Mar. 31, 2011
Basic and diluted earnings (loss) per share numerators (in millions): |  |
Net income attributable to White Mountains' common shareholders | $ 0.1 | $ 2.5
Net income attributable to White Mountains' common shareholders, net of restricted common share amounts | 93.8 | (28.2)
Basic earnings per share denominators (in thousands): |  |
Total average common shares outstanding during the period | 7,431,700 | 8,031,800
Average unvested restricted common shares | (78,300) | (57,100)
Basic earnings (loss) per share denominator | 7,353,400 | 7,974,700
Diluted earnings per share denominator (in thousands): |  |
Total average common shares outstanding during the period | 7,431,700 | 8,031,800
Average unvested restricted common shares | (78,300) | (57,100)
Diluted earnings (loss) per share denominator | 7,353,400 | 7,974,700
Discontinued Operations. |  |
Basic and diluted earnings (loss) per share numerators (in millions): |  |
Net income attributable to White Mountains' common shareholders | 0.1 | 2.5
Net income attributable to White Mountains' common shareholders, net of restricted common share amounts | $ 0.1 | $ 2.5
Basic earnings per share denominators (in thousands): |  |
Total average common shares outstanding during the period | 7,431,700 | 8,031,800
Average unvested restricted common shares | (78,300) | (57,100)
Basic earnings (loss) per share denominator | 7,353,400 | 7,974,700
Diluted earnings per share denominator (in thousands): |  |
Total average common shares outstanding during the period | 7,431,700 | 8,031,800
Average unvested restricted common shares | (78,300) | (57,100)
Diluted earnings (loss) per share denominator | 7,353,400 | 7,974,700
Basic and diluted earnings (loss) per share (in dollars per share): | $ 0.02 | $ 0.31

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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 This element represents the overall income (loss) from a disposal group that is classified as a component of the entity, net of income tax, reported as a separate component of income before extraordinary items before deduction or consideration of the amount which may be allocable to noncontrolling interests, if any. Includes the following (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 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 2: 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 3: 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 4: 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 5: 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 6: 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 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Article 7 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 15 Reference 9: 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 + Details
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