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Accounting Policies (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 0 Months Ended
--- | --- | ---
Mar. 29, 2015 | Dec. 31, 2014 | Mar. 30, 2014 | Dec. 01, 2014
Gross Balance |  |  |  |
Balance at the beginning of the period | $ 676.4 us-gaap_GoodwillGross |  | $ 539.3 us-gaap_GoodwillGross |
Foreign Currency Translation and Other | (27.0)wts_GoodwillTranslationAdjustmentsAndOtherChanges |  | (0.9)wts_GoodwillTranslationAdjustmentsAndOtherChanges |
Balance at the end of the period | 649.4 us-gaap_GoodwillGross | 676.4 us-gaap_GoodwillGross | 538.4 us-gaap_GoodwillGross |
Accumulated Impairment Losses |  |  |  |
Balance at the beginning of the period | (37.4)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss |  | (24.5)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss |
Impairment Loss During the Period |  | 12.9 wts_GoodwillAccumulatedImpairmentLossDuringPeriod |  |
Balance at the end of the period | (37.4)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss | (37.4)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss | (24.5)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss |
Net Goodwill | 612.0 us-gaap_Goodwill | 639.0 us-gaap_Goodwill | 513.9 us-gaap_Goodwill |
Business combination |  |  |  |
Purchase price allocated to goodwill | 612.0 us-gaap_Goodwill | 639.0 us-gaap_Goodwill | 513.9 us-gaap_Goodwill |
Tax benefit on Impairment charge | 0 wts_TaxBenefitOnImpairmentCharge |  |  |
Aerco |  |  |  |
Accumulated Impairment Losses |  |  |  |
Net Goodwill |  |  |  | 174.3 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = wts_AercoInternationalIncMember
Business combination |  |  |  |
Aggregate consideration, net |  |  |  | 272.2 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = wts_AercoInternationalIncMember
Purchase price allocated to goodwill |  |  |  | 174.3 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = wts_AercoInternationalIncMember
Purchase price allocated to intangible assets |  |  |  | 102.4 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = wts_AercoInternationalIncMember
Americas |  |  |  |
Gross Balance |  |  |  |
Balance at the beginning of the period | 398.0 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember |  | 224.7 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember |
Foreign Currency Translation and Other | (0.7)wts_GoodwillTranslationAdjustmentsAndOtherChanges / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember |  | (0.4)wts_GoodwillTranslationAdjustmentsAndOtherChanges / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember |
Balance at the end of the period | 397.3 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember |  | 224.3 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember |
Accumulated Impairment Losses |  |  |  |
Balance at the beginning of the period | (24.5)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember |  | (24.5)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember |
Balance at the end of the period | (24.5)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember |  | (24.5)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember |
Net Goodwill | 372.8 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember |  | 199.8 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember |
Business combination |  |  |  |
Purchase price allocated to goodwill | 372.8 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember |  | 199.8 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember |
EMEA |  |  |  |
Gross Balance |  |  |  |
Balance at the beginning of the period | 265.5 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = wts_EuropeMiddleEastAndAfricaMember |  | 301.3 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = wts_EuropeMiddleEastAndAfricaMember |
Foreign Currency Translation and Other | (26.3)wts_GoodwillTranslationAdjustmentsAndOtherChanges / us-gaap_StatementBusinessSegmentsAxis = wts_EuropeMiddleEastAndAfricaMember |  | (0.1)wts_GoodwillTranslationAdjustmentsAndOtherChanges / us-gaap_StatementBusinessSegmentsAxis = wts_EuropeMiddleEastAndAfricaMember |
Balance at the end of the period | 239.2 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = wts_EuropeMiddleEastAndAfricaMember |  | 301.2 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = wts_EuropeMiddleEastAndAfricaMember |
Accumulated Impairment Losses |  |  |  |
Net Goodwill | 239.2 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = wts_EuropeMiddleEastAndAfricaMember |  | 301.2 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = wts_EuropeMiddleEastAndAfricaMember |
Business combination |  |  |  |
Purchase price allocated to goodwill | 239.2 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = wts_EuropeMiddleEastAndAfricaMember |  | 301.2 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = wts_EuropeMiddleEastAndAfricaMember |
Asia Pacific |  |  |  |
Gross Balance |  |  |  |
Balance at the beginning of the period |  |  | 13.3 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AsiaPacificMember |
Foreign Currency Translation and Other |  |  | (0.4)wts_GoodwillTranslationAdjustmentsAndOtherChanges / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AsiaPacificMember |
Balance at the end of the period | 12.9 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AsiaPacificMember | 12.9 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AsiaPacificMember | 12.9 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AsiaPacificMember |
Accumulated Impairment Losses |  |  |  |
Balance at the end of the period | (12.9)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AsiaPacificMember | (12.9)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AsiaPacificMember |  |
Net Goodwill |  |  | 12.9 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AsiaPacificMember |
Business combination |  |  |  |
Purchase price allocated to goodwill |  |  | $ 12.9 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AsiaPacificMember |

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