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v2.4.1.9

Fair Value Measurements (Fair Value of Assets and Liabilities) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Assets: |  |
Short-term investments |  | $ 7.5 us-gaap_ShortTermInvestments
Derivative Instruments in Hedges, Assets, at Fair Value | 0.2 us-gaap_DerivativeInstrumentsInHedgesAssetsAtFairValue |
Deferred compensation assets | 6.6 us-gaap_AssetsHeldInTrustNoncurrent | 5.7 us-gaap_AssetsHeldInTrustNoncurrent
Total assets at fair value | 6.8 us-gaap_AssetsFairValueDisclosureRecurring | 13.2 us-gaap_AssetsFairValueDisclosureRecurring
Liabilities: |  |
Contingent consideration | 5.0 us-gaap_BusinessCombinationContingentConsiderationLiability | 4.3 us-gaap_BusinessCombinationContingentConsiderationLiability
Deferred compensation liabilities | 8.7 wst_DeferredCompensationLiabilitiesFairValueDisclosure | 7.8 wst_DeferredCompensationLiabilitiesFairValueDisclosure
Interest rate swap contracts | 3.6 us-gaap_InterestRateDerivativeLiabilitiesAtFairValue | 5.6 us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
Total liabilities at fair value | 17.3 us-gaap_LiabilitiesFairValueDisclosure | 17.7 us-gaap_LiabilitiesFairValueDisclosure
Other Financial Instruments [Abstract] |  |
Long-term debt, fair value | 311.4 us-gaap_LongTermDebtFairValue | 365.8 us-gaap_LongTermDebtFairValue
Long-term debt | 309.5 us-gaap_LongTermDebtNoncurrent | 371.3 us-gaap_LongTermDebtNoncurrent
Level 1 [Member] |  |
Assets: |  |
Short-term investments |  | 7.5 us-gaap_ShortTermInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Derivative Instruments in Hedges, Assets, at Fair Value | 0 us-gaap_DerivativeInstrumentsInHedgesAssetsAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
Deferred compensation assets | 6.6 us-gaap_AssetsHeldInTrustNoncurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 5.7 us-gaap_AssetsHeldInTrustNoncurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Total assets at fair value | 6.6 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 13.2 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Liabilities: |  |
Deferred compensation liabilities | 8.7 wst_DeferredCompensationLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 7.8 wst_DeferredCompensationLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Total liabilities at fair value | 8.7 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 7.8 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Level 2 [Member] |  |
Assets: |  |
Derivative Instruments in Hedges, Assets, at Fair Value | 0.2 us-gaap_DerivativeInstrumentsInHedgesAssetsAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
Total assets at fair value | 0.2 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
Liabilities: |  |
Interest rate swap contracts | 3.6 us-gaap_InterestRateDerivativeLiabilitiesAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 5.6 us-gaap_InterestRateDerivativeLiabilitiesAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Total liabilities at fair value | 3.6 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 5.6 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Level 3 [Member] |  |
Liabilities: |  |
Contingent consideration | 5.0 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 4.3 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Total liabilities at fair value | $ 5.0 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | $ 4.3 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member

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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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- Definition Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph g -Article 7 + Details
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