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SCHEDULE II CONDENSED FINANCIAL INFORMATION OF THE REGISTRANT (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Assets |  |
Cash | $ 373.2 wtm_CashIncludingRestrictedCash | $ 382.8 wtm_CashIncludingRestrictedCash
Fixed maturity investments, at fair value | 4,784.3 us-gaap_TradingSecuritiesDebt | 5,030.5 us-gaap_TradingSecuritiesDebt
Short-term investments, at amortized cost | 871.7 us-gaap_ShortTermInvestments | 635.9 us-gaap_ShortTermInvestments
Other assets | 356.1 us-gaap_OtherAssets | 437.4 us-gaap_OtherAssets
Total assets | 10,456.9 us-gaap_Assets | 12,144.3 us-gaap_Assets
Liabilities |  |
Debt | 746.6 us-gaap_LongTermDebt | 676.4 us-gaap_LongTermDebt
Other liabilities | 341.0 us-gaap_OtherLiabilities | 415.7 us-gaap_OtherLiabilities
Total liabilities | 5,917.3 us-gaap_Liabilities | 7,746.9 us-gaap_Liabilities
White Mountains’s common shareholders’ equity | 4,539.6 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 4,397.4 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Total liabilities and equity | 10,456.9 us-gaap_LiabilitiesAndStockholdersEquity | 12,144.3 us-gaap_LiabilitiesAndStockholdersEquity
White Mountains Insurance Group Ltd. |  |
Assets |  |
Cash | 0.2 wtm_CashIncludingRestrictedCash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0.2 wtm_CashIncludingRestrictedCash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Fixed maturity investments, at fair value | 0 us-gaap_TradingSecuritiesDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 31.8 us-gaap_TradingSecuritiesDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Short-term investments, at amortized cost | 31.0 us-gaap_ShortTermInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1.4 us-gaap_ShortTermInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other assets | 0.2 us-gaap_OtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0.4 us-gaap_OtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Investments in consolidated and unconsolidated affiliates | 4,119.4 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,919.1 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total assets | 4,150.8 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,952.9 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Liabilities |  |
Debt | 0 us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Payable to subsidiary | 161.6 us-gaap_DueToAffiliateCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 47.0 us-gaap_DueToAffiliateCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other liabilities | (7.4)us-gaap_OtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0.4 us-gaap_OtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total liabilities | 154.2 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 47.4 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
White Mountains’s common shareholders’ equity | 3,996.6 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,905.5 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total liabilities and equity | $ 4,150.8 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 3,952.9 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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