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Consolidated Statements of Comprehensive (Loss) Income (Parenthetical) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Consolidated Statements of Comprehensive (Loss) Income |  |  |
Other Comprehensive Income Defined Benefit Plan Income Tax Effect | $ 6.9 wts_OtherComprehensiveIncomeDefinedBenefitPlanIncomeTaxEffect | $ 0.8 wts_OtherComprehensiveIncomeDefinedBenefitPlanIncomeTaxEffect | $ 4.1 wts_OtherComprehensiveIncomeDefinedBenefitPlanIncomeTaxEffect
Other Comprehensive Income Amortization of Net Losses included in Net Periodic Pension Cost Tax Effect | $ 0.5 wts_OtherComprehensiveIncomeAmortizationOfNetLossesIncludedInNetPeriodicPensionCostTaxEffect | $ 0.4 wts_OtherComprehensiveIncomeAmortizationOfNetLossesIncludedInNetPeriodicPensionCostTaxEffect | $ 0.2 wts_OtherComprehensiveIncomeAmortizationOfNetLossesIncludedInNetPeriodicPensionCostTaxEffect

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- Definition Represents the amount of tax effect on the amortization of net losses included in net periodic pension cost. + References No definition available. + Details
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- Definition Represents the income tax effect attributable to pension and other postretirement benefit plans. + References No definition available. + Details
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