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Business Acquisitions and Disposition (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended | 0 Months Ended | 12 Months Ended | 3 Months Ended | 0 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 01, 2014 | Dec. 31, 2013 | Mar. 30, 2014 | Jun. 30, 2013 | Jan. 31, 2012 | Dec. 31, 2012
Acquisition |  |  |  |  |  |  |
Purchase price allocated to goodwill | $ 639.0 us-gaap_Goodwill |  | $ 514.8 us-gaap_Goodwill |  |  |  |
Estimated useful lives | 12 years 2 months 12 days |  |  |  |  |  |
Value of the assets and liabilities acquired |  |  |  |  |  |  |
Goodwill | 639.0 us-gaap_Goodwill |  | 514.8 us-gaap_Goodwill |  |  |  |
Technology |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |
Estimated useful lives | 10 years 3 months 18 days |  |  |  |  |  |
Customer relationships |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |
Estimated useful lives | 11 years 10 months 24 days |  |  |  |  |  |
Trade name |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |
Estimated useful lives | 14 years 6 months |  |  |  |  |  |
Aerco |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |
Short term working capital escrow |  | 7.7 wts_BusinessCombinationShortTermWorkingCapitalEscrow / us-gaap_BusinessAcquisitionAxis = wts_AercoInternationalincMember |  |  |  |  |
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 |  |  |  |  |
Revenues | 5.3 us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = wts_AercoInternationalincMember |  |  |  |  |  |
Operating Income (Loss) | (1.4)us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = wts_AercoInternationalincMember |  |  |  |  |  |
Acquisition accounting charges | 0.8 us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = wts_AercoInternationalincMember |  |  |  |  |  |
Value of the assets and liabilities acquired |  |  |  |  |  |  |
Accounts receivable |  | 16.7 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = wts_AercoInternationalincMember |  |  |  |  |
Inventory |  | 16.4 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = wts_AercoInternationalincMember |  |  |  |  |
Fixed assets |  | 7.6 wts_Businesscombinationrecognizedidentifiableassetsacquiredandliabilitiesassumedfixedassets / us-gaap_BusinessAcquisitionAxis = wts_AercoInternationalincMember |  |  |  |  |
Deferred tax assets |  | 8.0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent / us-gaap_BusinessAcquisitionAxis = wts_AercoInternationalincMember |  |  |  |  |
Other assets |  | 7.6 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = wts_AercoInternationalincMember |  |  |  |  |
Intangible assets |  | 102.4 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = wts_AercoInternationalincMember |  |  |  |  |
Goodwill |  | 174.3 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = wts_AercoInternationalincMember |  |  |  |  |
Accounts payable |  | (6.7)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable / us-gaap_BusinessAcquisitionAxis = wts_AercoInternationalincMember |  |  |  |  |
Accrued expenses and other |  | (18.1)wts_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedExpensesAndOther / us-gaap_BusinessAcquisitionAxis = wts_AercoInternationalincMember |  |  |  |  |
Deferred tax liability |  | (36.0)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesCurrent / us-gaap_BusinessAcquisitionAxis = wts_AercoInternationalincMember |  |  |  |  |
Purchase price |  | 272.2 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = wts_AercoInternationalincMember |  |  |  |  |
Supplemental pro-forma information |  |  |  |  |  |  |
Net sales | 1,610.1 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = wts_AercoInternationalincMember |  | 1,562.8 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = wts_AercoInternationalincMember |  |  |  |
Net income from continuing operations | 59.7 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = wts_AercoInternationalincMember |  | 63.4 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = wts_AercoInternationalincMember |  |  |  |
Basic EPS - continuing operations | $ 1.69 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = wts_AercoInternationalincMember |  | $ 1.79 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = wts_AercoInternationalincMember |  |  |  |
Diluted EPS - continuing operations | $ 1.69 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = wts_AercoInternationalincMember |  | $ 1.78 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = wts_AercoInternationalincMember |  |  |  |
Net interest expense related to the financing | 3.1 wts_NetInterestExpenseRelatedToFinancing / us-gaap_BusinessAcquisitionAxis = wts_AercoInternationalincMember |  | 3.3 wts_NetInterestExpenseRelatedToFinancing / us-gaap_BusinessAcquisitionAxis = wts_AercoInternationalincMember |  |  |  |
Net amortization expense | 3.9 wts_NetAmortizationExpense / us-gaap_BusinessAcquisitionAxis = wts_AercoInternationalincMember |  | 4.3 wts_NetAmortizationExpense / us-gaap_BusinessAcquisitionAxis = wts_AercoInternationalincMember |  |  |  |
Net acquisition-related charges and third-party costs | 3.3 wts_NetAcquisitionRelatedChargesAndThirdPartyCosts / us-gaap_BusinessAcquisitionAxis = wts_AercoInternationalincMember |  |  |  |  |  |
Aerco | Technology |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |
Purchase price allocated to intangible assets |  | 15.8 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = wts_AercoInternationalincMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember |  |  |  |  |
Estimated useful lives |  | 10 years |  |  |  |  |
Value of the assets and liabilities acquired |  |  |  |  |  |  |
Intangible assets |  | 15.8 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = wts_AercoInternationalincMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember |  |  |  |  |
Aerco | Customer relationships |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |
Purchase price allocated to intangible assets |  | 78.5 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = wts_AercoInternationalincMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |  |  |  |
Estimated useful lives |  | 16 years |  |  |  |  |
Value of the assets and liabilities acquired |  |  |  |  |  |  |
Intangible assets |  | 78.5 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = wts_AercoInternationalincMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |  |  |  |
Aerco | Trade name |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |
Purchase price allocated to intangible assets |  | 7.4 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = wts_AercoInternationalincMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |  |  |  |  |
Estimated useful lives |  | 20 years |  |  |  |  |
Value of the assets and liabilities acquired |  |  |  |  |  |  |
Intangible assets |  | 7.4 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = wts_AercoInternationalincMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |  |  |  |  |
Tekmar |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |
Initial purchase price paid |  |  |  |  |  | 17.8 wts_BusinessAcquisitionCostOfAcquiredEntityInitialPurchasePricePaid / us-gaap_BusinessAcquisitionAxis = wts_TekmarControlSystemsMember |
Purchase price allocated to goodwill |  |  |  |  |  | 11.7 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = wts_TekmarControlSystemsMember |
Purchase price allocated to intangible assets |  |  |  |  |  | 10.1 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = wts_TekmarControlSystemsMember |
Contingent liability of the acquisition date fair value |  |  |  |  |  |  | 5.1 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = wts_TekmarControlSystemsMember
Portion of contingent consideration paid on achievement of performance metrics | 2.2 us-gaap_PaymentsForPreviousAcquisition / us-gaap_BusinessAcquisitionAxis = wts_TekmarControlSystemsMember |  | 1.2 us-gaap_PaymentsForPreviousAcquisition / us-gaap_BusinessAcquisitionAxis = wts_TekmarControlSystemsMember | 2.2 us-gaap_PaymentsForPreviousAcquisition / us-gaap_BusinessAcquisitionAxis = wts_TekmarControlSystemsMember | 1.2 us-gaap_PaymentsForPreviousAcquisition / us-gaap_BusinessAcquisitionAxis = wts_TekmarControlSystemsMember |  |
Increase in contingent liability | 0.5 us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 / us-gaap_BusinessAcquisitionAxis = wts_TekmarControlSystemsMember |  | 1.0 us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 / us-gaap_BusinessAcquisitionAxis = wts_TekmarControlSystemsMember |  |  |  |
Value of the assets and liabilities acquired |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  | 10.1 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = wts_TekmarControlSystemsMember |
Goodwill |  |  |  |  |  | 11.7 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = wts_TekmarControlSystemsMember |
Tekmar | Technology |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  | 10 years |
Tekmar | Distributor relationships |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  | 7 years |
Tekmar | Trade name |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  | 20 years |

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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount of liabilities incurred for goods and services received that are used in an entity's business and related party payables, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount of deferred tax asset attributable to deductible temporary differences and carryforwards that are expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary difference due within one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition The amount of inventory recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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- Definition Amount of other assets expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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