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Selected Quarterly Financial Data (Unaudited) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues (including realized gains and losses) | $ 689.7 us-gaap_Revenues | $ 589.4 us-gaap_Revenues | $ 652.8 us-gaap_Revenues | $ 578.3 us-gaap_Revenues | $ 626.6 us-gaap_Revenues | $ 574.1 us-gaap_Revenues | $ 489.3 us-gaap_Revenues | $ 627.4 us-gaap_Revenues | $ 2,510.2 us-gaap_Revenues | $ 2,317.4 us-gaap_Revenues | $ 2,435.7 us-gaap_Revenues
Total expenses | 643.5 us-gaap_BenefitsLossesAndExpenses | 555.0 us-gaap_BenefitsLossesAndExpenses | 543.8 us-gaap_BenefitsLossesAndExpenses | 466.2 us-gaap_BenefitsLossesAndExpenses | 492.4 us-gaap_BenefitsLossesAndExpenses | 518.8 us-gaap_BenefitsLossesAndExpenses | 485.7 us-gaap_BenefitsLossesAndExpenses | 475.6 us-gaap_BenefitsLossesAndExpenses | 2,208.5 us-gaap_BenefitsLossesAndExpenses | 1,972.5 us-gaap_BenefitsLossesAndExpenses | 2,172.9 us-gaap_BenefitsLossesAndExpenses
Pre-tax loss | 46.2 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 34.4 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 109.0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 112.1 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 134.2 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 55.3 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 3.6 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 151.8 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 301.7 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 344.9 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 262.8 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Tax benefit (expense) | 8.7 us-gaap_IncomeTaxExpenseBenefit | (7.8)us-gaap_IncomeTaxExpenseBenefit | (23.9)us-gaap_IncomeTaxExpenseBenefit | (30.3)us-gaap_IncomeTaxExpenseBenefit | (27.4)us-gaap_IncomeTaxExpenseBenefit | (8.2)us-gaap_IncomeTaxExpenseBenefit | 0.6 us-gaap_IncomeTaxExpenseBenefit | (41.6)us-gaap_IncomeTaxExpenseBenefit | (53.3)us-gaap_IncomeTaxExpenseBenefit | (76.6)us-gaap_IncomeTaxExpenseBenefit | 15.7 us-gaap_IncomeTaxExpenseBenefit
Net income from continuing operations | 54.9 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 26.6 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 85.1 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 81.8 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 106.8 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 47.1 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 4.2 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 110.2 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 248.4 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 268.3 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 278.5 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Net loss from discontinued operations, net of tax | (12.2)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 6.7 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 2.6 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (0.5)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (0.3)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 0.4 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 3.9 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 0.5 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (1.8)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (42.1)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (24.0)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Non-controlling interest in consolidated subsidiaries | 15.0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 11.2 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (4.6)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 0.5 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (0.3)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 1.1 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 11.1 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 0.5 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 22.1 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 12.4 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 14.0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Equity in earnings of unconsolidated affiliates, net of tax | 12.3 us-gaap_IncomeLossFromEquityMethodInvestments | 7.0 us-gaap_IncomeLossFromEquityMethodInvestments | 12.5 us-gaap_IncomeLossFromEquityMethodInvestments | 13.8 us-gaap_IncomeLossFromEquityMethodInvestments | 11.7 us-gaap_IncomeLossFromEquityMethodInvestments | 8.6 us-gaap_IncomeLossFromEquityMethodInvestments | 7.1 us-gaap_IncomeLossFromEquityMethodInvestments | 9.2 us-gaap_IncomeLossFromEquityMethodInvestments | 45.6 us-gaap_IncomeLossFromEquityMethodInvestments | 36.6 us-gaap_IncomeLossFromEquityMethodInvestments | 29.9 us-gaap_IncomeLossFromEquityMethodInvestments
Net income attributable to White Mountains’s common shareholders | $ 70.0 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 51.5 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 95.6 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 95.6 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 117.9 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 57.2 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 26.3 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 120.4 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 312.7 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 321.8 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 207.4 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Basic earnings (loss) per share |  |  |  |  |  |  |  |  |  |  |
Continuing operations | $ 13.71 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 7.35 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 15.10 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 15.56 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 19.14 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 9.20 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 3.62 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 19.10 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 51.77 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 51.15 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 47.41 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Discontinued operations | $ (2.03)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 1.10 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.43 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ (0.08)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ (0.05)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.06 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.64 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.07 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ (0.56)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.74 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ (16.91)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Total consolidated operations | $ 11.68 us-gaap_EarningsPerShareBasic | $ 8.45 us-gaap_EarningsPerShareBasic | $ 15.53 us-gaap_EarningsPerShareBasic | $ 15.48 us-gaap_EarningsPerShareBasic | $ 19.09 us-gaap_EarningsPerShareBasic | $ 9.26 us-gaap_EarningsPerShareBasic | $ 4.26 us-gaap_EarningsPerShareBasic | $ 19.17 us-gaap_EarningsPerShareBasic | $ 51.21 us-gaap_EarningsPerShareBasic | $ 51.89 us-gaap_EarningsPerShareBasic | $ 30.50 us-gaap_EarningsPerShareBasic
Diluted earnings (loss) per share |  |  |  |  |  |  |  |  |  |  |
Continuing operations | $ 13.71 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 7.35 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 15.10 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 15.56 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 19.14 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 9.20 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 3.62 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 19.10 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 51.77 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 51.15 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 47.41 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Discontinued operations | $ (2.03)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 1.10 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.43 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ (0.08)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ (0.05)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.06 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.64 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.07 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ (0.56)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.74 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ (16.91)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Total consolidated operations | $ 11.68 us-gaap_EarningsPerShareDiluted | $ 8.45 us-gaap_EarningsPerShareDiluted | $ 15.53 us-gaap_EarningsPerShareDiluted | $ 15.48 us-gaap_EarningsPerShareDiluted | $ 19.09 us-gaap_EarningsPerShareDiluted | $ 9.26 us-gaap_EarningsPerShareDiluted | $ 4.26 us-gaap_EarningsPerShareDiluted | $ 19.17 us-gaap_EarningsPerShareDiluted | $ 51.21 us-gaap_EarningsPerShareDiluted | $ 51.89 us-gaap_EarningsPerShareDiluted | $ 30.50 us-gaap_EarningsPerShareDiluted

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