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v2.4.1.9

Accounting Policies (Details 2) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Intangible assets |  |  |
Non-cash pre-tax impairment charges of indefinite lived intangible assets | $ 1.3 us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill | $ 0.7 us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill | $ 0.4 us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
Intangible assets subject to amortization |  |  |
Gross Carrying Amount | 295.1 us-gaap_FiniteLivedIntangibleAssetsGross | 199.0 us-gaap_FiniteLivedIntangibleAssetsGross |
Accumulated Amortization | (123.6)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | (108.5)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |
Net Carrying Amount | 171.5 us-gaap_FiniteLivedIntangibleAssetsNet | 90.5 us-gaap_FiniteLivedIntangibleAssetsNet |
Indefinite-lived intangible assets |  |  |
Indefinite-lived intangible assets | 38.6 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill | 41.9 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill |
Intangible assets |  |  |
Gross Carrying Amount | 333.7 us-gaap_IntangibleAssetsGrossExcludingGoodwill | 240.9 us-gaap_IntangibleAssetsGrossExcludingGoodwill |
Net Carrying Amount | 210.1 us-gaap_IntangibleAssetsNetExcludingGoodwill | 132.4 us-gaap_IntangibleAssetsNetExcludingGoodwill |
Weighted-average amortization | 12 years 2 months 12 days |  |
Aggregate amortization expense for amortized intangible assets | 15.2 us-gaap_AmortizationOfIntangibleAssets | 14.7 us-gaap_AmortizationOfIntangibleAssets | 15.4 us-gaap_AmortizationOfIntangibleAssets
Future amortization expense |  |  |
Future amortization expense, 2015 | 20.5 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths |  |
Future amortization expense, 2016 | 20.1 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo |  |
Future amortization expense, 2017 | 19.7 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree |  |
Future amortization expense, 2018 | 16.2 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour |  |
Future amortization expense, 2019 | 14.0 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive |  |
Aerco |  |  |
Intangible assets |  |  |
Net Carrying Amount | 102.4 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_BusinessAcquisitionAxis = wts_AercoMember |  |
Weighted-average amortization | 15 years |  |
Patents |  |  |
Intangible assets subject to amortization |  |  |
Gross Carrying Amount | 16.2 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember | 16.6 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember |
Accumulated Amortization | (13.3)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember | (12.6)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember |
Net Carrying Amount | 2.9 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember | 4.0 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember |
Intangible assets |  |  |
Weighted-average amortization | 5 years |  |
Customer relationships |  |  |
Intangible assets subject to amortization |  |  |
Gross Carrying Amount | 206.7 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 133.0 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Accumulated Amortization | (87.5)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | (76.4)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Net Carrying Amount | 119.2 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 56.6 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Intangible assets |  |  |
Weighted-average amortization | 11 years 10 months 24 days |  |
Customer relationships | Aerco |  |  |
Intangible assets |  |  |
Gross Carrying Amount | 78.5 us-gaap_IntangibleAssetsGrossExcludingGoodwill / us-gaap_BusinessAcquisitionAxis = wts_AercoMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |
Weighted-average amortization | 16 years |  |
Technology |  |  |
Intangible assets subject to amortization |  |  |
Gross Carrying Amount | 42.1 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember | 26.9 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember |
Accumulated Amortization | (12.9)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember | (10.9)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember |
Net Carrying Amount | 29.2 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember | 16.0 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember |
Intangible assets |  |  |
Weighted-average amortization | 10 years 3 months 18 days |  |
Technology | Aerco |  |  |
Intangible assets |  |  |
Gross Carrying Amount | 15.8 us-gaap_IntangibleAssetsGrossExcludingGoodwill / us-gaap_BusinessAcquisitionAxis = wts_AercoMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember |  |
Weighted-average amortization | 10 years |  |
Trade name |  |  |
Intangible assets subject to amortization |  |  |
Gross Carrying Amount | 20.6 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember | 13.7 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |
Accumulated Amortization | (4.2)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember | (3.0)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |
Net Carrying Amount | 16.4 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember | 10.7 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |
Intangible assets |  |  |
Weighted-average amortization | 14 years 6 months |  |
Trade name | Aerco |  |  |
Intangible assets |  |  |
Gross Carrying Amount | 7.4 us-gaap_IntangibleAssetsGrossExcludingGoodwill / us-gaap_BusinessAcquisitionAxis = wts_AercoMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |  |
Weighted-average amortization | 20 years |  |
Trade name | Americas |  |  |
Intangible assets |  |  |
Long-lived assets written-down | 0.5 us-gaap_AssetImpairmentCharges / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember |  |
Trade name | EMEA |  |  |
Intangible assets |  |  |
Long-lived assets written-down | 0.8 us-gaap_AssetImpairmentCharges / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember / us-gaap_StatementGeographicalAxis = wts_EuropeMiddleEastAndAfricaMember |  |
Other |  |  |
Intangible assets subject to amortization |  |  |
Gross Carrying Amount | 9.5 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember | 8.8 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |
Accumulated Amortization | (5.7)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember | (5.6)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |
Net Carrying Amount | $ 3.8 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember | $ 3.2 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |
Intangible assets |  |  |
Weighted-average amortization | 33 years 3 months 18 days |  |

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