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Income Taxes (Details 3) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Valuation allowance |  |  |
Valuation allowance | $ 12.5 us-gaap_DeferredTaxAssetsValuationAllowance | $ 13.1 us-gaap_DeferredTaxAssetsValuationAllowance |
Provision for income taxes | 32.8 us-gaap_IncomeTaxExpenseBenefit | 26.9 us-gaap_IncomeTaxExpenseBenefit | 29.8 us-gaap_IncomeTaxExpenseBenefit
Undistributed earnings of the Company's foreign subsidiaries | 386.0 us-gaap_UndistributedEarningsOfForeignSubsidiaries | 397.2 us-gaap_UndistributedEarningsOfForeignSubsidiaries | 329.7 us-gaap_UndistributedEarningsOfForeignSubsidiaries
Withholding taxes payable upon remittance of all previously unremitted earnings | 12.0 wts_WithholdingTaxesPayableUponRemittanceOfAllPreviouslyUnremittedEarnings |  |
U.S. |  |  |
Valuation allowance |  |  |
Valuation allowance | 6.2 us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = country_US | 6.1 us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = country_US |
2015 | 2.6 wts_DeferredTaxAssetsValuationAllowanceInYearTwo / us-gaap_IncomeTaxAuthorityAxis = country_US |  |
2016 | 2.1 wts_DeferredTaxAssetsValuationAllowanceInYearThree / us-gaap_IncomeTaxAuthorityAxis = country_US |  |
2017 | 1.0 wts_DeferredTaxAssetsValuationAllowanceInYearFour / us-gaap_IncomeTaxAuthorityAxis = country_US |  |
2018 | 0.5 wts_DeferredTaxAssetsValuationAllowanceInYearFive / us-gaap_IncomeTaxAuthorityAxis = country_US |  |
Provision for income taxes | 0 us-gaap_IncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = country_US |  |
Austria |  |  |
Valuation allowance |  |  |
Valuation allowance | $ 6.3 us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = wts_AustriaMember | $ 7.0 us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = wts_AustriaMember |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(c) -URI http://asc.fasb.org/extlink&oid=6424122&loc=d3e41874-109331 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 740 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6479915&loc=d3e66715-112838 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 740 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6487024&loc=d3e29054-158556 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 995 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6503627&loc=d3e59836-110443 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28200-109314 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized in the fifth fiscal year following the latest fiscal year. + References No definition available. + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized in the fourth fiscal year following the latest fiscal year. + References No definition available. + Details
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