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Derivatives (Pre-Tax Operating Results of WM Life Re) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Pre-tax operating results of WM Life Re |  |  |  |
Revenues | $ 697.4 | $ 501.8 | $ 1,869.3 | $ 1,579.7
General and administrative expenses | (58.7) | (36.2) | (146.3) | (120.4)
Pre-tax income (loss) from continuing operations | 135.1 | 1.3 | 313.6 | (0.4)
White Mountains Life Re [Member] |  |  |  |
Pre-tax operating results of WM Life Re |  |  |  |
Policy Charges, Insurance | 8.1 | 8.4 | 24.1 | 24.3
Gain (Loss) on Variable Annuity Liabilities | (11.3) | (164.4) | 89.4 | (148.0)
Derivative, Gain (Loss) on Derivative, Net | (11.0) | 148.9 | (122.0) | 105.4
Foreign Exchange Derivatives Gain (Loss) | 9.0 | 14.8 | (6.4) | 17.1
Other Investment Income and Gain (Loss) on Investments | 3.8 | 0.5 | 2.9 | (0.1)
Revenues | (1.4) | 8.2 | (12.0) | (1.3)
Gain (Loss) on Liability for Death Benefit | 0.7 | (5.6) | 6.7 | (3.1)
Liability for Future Policy Benefits, Benefits Paid | (1.5) | (0.7) | (4.9) | (2.4)
General and administrative expenses | (1.1) | (1.1) | (3.8) | (3.2)
Pre-tax income (loss) from continuing operations | $ (3.3) | $ 0.8 | $ (14.0) | $ (10.0)

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- Definition Monetary decrease in the future benefit reserve resulting from amounts paid to policy and contract holders during the period for policy benefit claims. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Financial Reporting Release (FRR) -Number 403 -Paragraph 04 -Subparagraph b Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-LHI -Paragraph 2, 27 -IssueDate 2006-05-01 -Chapter 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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