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Accounting Policies (Details 4) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 item | Dec. 31, 2013 | Dec. 31, 2012
Stock-based compensation |  |  |
Number of stock-based compensation plans | 1 wts_NumberOfStockBasedCompensationPlans |  |
Total unrecognized compensation costs related to unvested stock-based compensation arrangements | $ 20.2 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized |  |
Total weighted average remaining term of unrecognized compensation costs | 1 year 10 months 24 days |  |
Compensation cost recognized | 8.6 us-gaap_AllocatedShareBasedCompensationExpense | 9.6 us-gaap_AllocatedShareBasedCompensationExpense | 6.6 us-gaap_AllocatedShareBasedCompensationExpense
Impact on both basic and diluted net income per common share for recognition of total stock-based compensation expense (in dollars per share) | $ 0.18 wts_AllocatedShareBasedCompensationExpenseImpactOnBasicAndDilutedEarningsPerShare | $ 0.14 wts_AllocatedShareBasedCompensationExpenseImpactOnBasicAndDilutedEarningsPerShare | $ 0.10 wts_AllocatedShareBasedCompensationExpenseImpactOnBasicAndDilutedEarningsPerShare
Cost of goods sold |  |  |
Stock-based compensation |  |  |
Compensation cost recognized | 0.6 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = wts_CostOfGoodsSoldMember |  |
Selling, general and administrative expenses |  |  |
Stock-based compensation |  |  |
Compensation cost recognized | 8.0 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember |  |
Stock options |  |  |
Stock-based compensation |  |  |
Tax benefit recorded for the compensation expense | 0.7 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 1.2 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 0.7 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Other Stock-based Plans |  |  |
Stock-based compensation |  |  |
Tax benefit recorded for the compensation expense | $ 1.6 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = wts_OtherStockBasedPlansMember | $ 1.9 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = wts_OtherStockBasedPlansMember | $ 1.4 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = wts_OtherStockBasedPlansMember

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Represents the impact on both basic and diluted net income per common share for recognition of total stock-based compensation expense. + References No definition available. + Details
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- Definition Number of stock-based compensation plans during the period for the entity. + References No definition available. + Details
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