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Financial Instruments (Details 4) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Derivative instruments |  |  |
Percentage of projected intercompany purchases hedged by forward exchange contracts | 50.00%wts_PercentageOfProjectedIntercompanyPurchaseTransactionsHedgedForNextTwelveMonthsByForwardExchangeContracts |  |
Period of projected intercompany purchase transactions | 12 months |  |
Amount of Gain or (Loss) Recognized in Income on Derivatives |  |  |
Income from derivatives recorded to other expense (income), net in statement of operations | $ 0 us-gaap_DerivativeGainLossOnDerivativeNet | $ 0.1 us-gaap_DerivativeGainLossOnDerivativeNet | $ 0.1 us-gaap_DerivativeGainLossOnDerivativeNet
Forward exchange contracts | Purchased contracts | Minimum |  |  |
Derivative instruments |  |  |
Notional amount | 0 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_PositionAxis = us-gaap_LongMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Forward exchange contracts | Purchased contracts | Maximum |  |  |
Derivative instruments |  |  |
Notional amount | 10.0 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_PositionAxis = us-gaap_LongMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Forward exchange contracts | Non designated |  |  |
Derivative instruments |  |  |
Notional amount | $ 1.0 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Details
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- Details
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- Definition Maximum length of time over which the entity is hedging its exposure to the variability in future cash flows for forecasted transactions. + References No definition available. + Details
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- Definition Represents the percentage of projected intercompany purchase transactions hedged for the next twelve months by forward exchange contracts. + References No definition available. + Details
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- Details
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