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Income Taxes (Details 3) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Valuation allowance      
Valuation allowance $ 12.5us-gaap_DeferredTaxAssetsValuationAllowance $ 13.1us-gaap_DeferredTaxAssetsValuationAllowance  
Provision for income taxes 32.8us-gaap_IncomeTaxExpenseBenefit 26.9us-gaap_IncomeTaxExpenseBenefit 29.8us-gaap_IncomeTaxExpenseBenefit
Undistributed earnings of the Company's foreign subsidiaries 386.0us-gaap_UndistributedEarningsOfForeignSubsidiaries 397.2us-gaap_UndistributedEarningsOfForeignSubsidiaries 329.7us-gaap_UndistributedEarningsOfForeignSubsidiaries
Withholding taxes payable upon remittance of all previously unremitted earnings 12.0wts_WithholdingTaxesPayableUponRemittanceOfAllPreviouslyUnremittedEarnings    
U.S.      
Valuation allowance      
Valuation allowance 6.2us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= country_US
6.1us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= country_US
 
2015 2.6wts_DeferredTaxAssetsValuationAllowanceInYearTwo
/ us-gaap_IncomeTaxAuthorityAxis
= country_US
   
2016 2.1wts_DeferredTaxAssetsValuationAllowanceInYearThree
/ us-gaap_IncomeTaxAuthorityAxis
= country_US
   
2017 1.0wts_DeferredTaxAssetsValuationAllowanceInYearFour
/ us-gaap_IncomeTaxAuthorityAxis
= country_US
   
2018 0.5wts_DeferredTaxAssetsValuationAllowanceInYearFive
/ us-gaap_IncomeTaxAuthorityAxis
= country_US
   
Provision for income taxes 0us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_IncomeTaxAuthorityAxis
= country_US
   
Austria      
Valuation allowance      
Valuation allowance $ 6.3us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= wts_AustriaMember
$ 7.0us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= wts_AustriaMember