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Financial Instruments (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Apr. 27, 2006
Jun. 18, 2010
Long-term debt        
Gross carrying amount $ 579.7us-gaap_DebtInstrumentCarryingAmount $ 307.7us-gaap_DebtInstrumentCarryingAmount    
Estimated fair value $ 599.3us-gaap_LongTermDebtFairValue $ 333.4us-gaap_LongTermDebtFairValue    
5.85% Senior notes due 2016        
Senior notes        
Interest rate (as a percent) 5.85%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= wts_SeniorNotes5.85PercentDue2016Member		   5.85%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= wts_SeniorNotes5.85PercentDue2016Member		  
5.05% Senior notes due 2020        
Senior notes        
Interest rate (as a percent) 5.05%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= wts_SeniorNotes5.05PercentDue2020Member		 5.05%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= wts_SeniorNotes5.05PercentDue2020Member		   5.05%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= wts_SeniorNotes5.05PercentDue2020Member