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Accounting Policies (Details 3) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Income Taxes  
Reduction in unrecognized tax benefits resulting from voluntary disclosure agreements $ 0.2wts_UnrecognizedTaxBenefitsDecreasesResultingFromVoluntaryDisclosureAgreements
Gross unrecognized tax benefits 1.8us-gaap_UnrecognizedTaxBenefits
Amount of unrecognized tax benefits which, if recognized, would affect the effective tax rate 1.3us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Reconciliation of the beginning and ending amount of unrecognized tax benefits  
Balance at the beginning of the period 0.8us-gaap_UnrecognizedTaxBenefits
Increases related to prior year tax positions 1.3us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
Settlements (0.2)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
Currency movement (0.1)us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromForeignCurrencyTranslation
Balance at the end of the period 1.8us-gaap_UnrecognizedTaxBenefits
Increase in unrecognized tax benefits 1.0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Reduction in unrecognized tax benefits related to reduced exposures in Europe $ 1.3wts_UnrecognizedTaxBenefitsDecreasesResultingFromReducedExposureInEurope
Percentage of likelihood of realization that the tax position must exceed in order for the amount to be recognized 50.00wts_TaxBenefitsRecognizationBasisForUncertainTaxPositionLikelihoodRealizationGreaterThanPercentage
Buildings and improvements | Minimum  
Property, plant and equipment  
Estimated useful lives of the assets 10 years
Buildings and improvements | Maximum  
Property, plant and equipment  
Estimated useful lives of the assets 40 years
Machinery and equipment | Minimum  
Property, plant and equipment  
Estimated useful lives of the assets 3 years
Machinery and equipment | Maximum  
Property, plant and equipment  
Estimated useful lives of the assets 15 years