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Derivative Financial Instruments (Details) In Millions, unless otherwise specified | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 31, 2015 Forward-Start Interest Rate Swap [Member] USD ($) | Mar. 31, 2015 Interest Rate Swap, Series B Note [Member] USD ($) | Mar. 31, 2015 Foreign Currency Hedge - USD Inventory Purchases, Euro Sub [Member] USD ($) | Mar. 31, 2015 Foreign Currency Hedge - USD Inventory Purchases, Euro Sub [Member] EUR (€) | Mar. 31, 2015 Foreign Currency Hedge - Euro Sales, U.S. Sub [Member] USD ($) | Mar. 31, 2015 Foreign Currency Hedge - Yen Inventory Purchases, U.S. [Member] USD ($) | Mar. 31, 2015 Foreign Currency Hedge - Yen Inventory Purchases, U.S. [Member] JPY (¥) | Mar. 31, 2015 Foreign Currency Hedge - Yen Inventory Purchases, Euro Sub [Member] USD ($) | Mar. 31, 2015 Foreign Currency Hedge - Yen Inventory Purchases, Euro Sub [Member] JPY (¥) | Mar. 31, 2015 Euro-Denominated Revolver [Member] USD ($) | Mar. 31, 2015 Euro-Denominated Revolver [Member] EUR (€) | Mar. 31, 2015 Yen-Denominated Revolver [Member] USD ($) | Mar. 31, 2015 Yen-Denominated Revolver [Member] JPY (¥) | Mar. 31, 2015 Euro Note B [Member] USD ($) | Mar. 31, 2015 Euro Note B [Member] EUR (€) | Mar. 31, 2015 Euro-Denominated Debt [Member] USD ($) | Dec. 31, 2014 Options Held [Member] USD ($) MBbls
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | $ 38.7 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = wst_ForwardStartInterestRateSwapMember | $ 25.0 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = wst_SwapSeriesBMember | $ 17.5 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = wst_USDinventorypurchasehedgeMember | € 14.5 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = wst_USDinventorypurchasehedgeMember | $ 16.8 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = wst_EuroUSDFxContractMember |  |  |  |  |  |  |  |  |  |  |  |
Derivative asset, notional amount |  |  |  |  |  | 9.9 us-gaap_DerivativeAssetNotionalAmount / us-gaap_DerivativeByNatureAxis = wst_YENUSDinventoryhedgeMember | 1,200.0 us-gaap_DerivativeAssetNotionalAmount / us-gaap_DerivativeByNatureAxis = wst_YENUSDinventoryhedgeMember | 6.1 us-gaap_DerivativeAssetNotionalAmount / us-gaap_DerivativeByNatureAxis = wst_YenEuroinventoryhedgeMember | 800.0 us-gaap_DerivativeAssetNotionalAmount / us-gaap_DerivativeByNatureAxis = wst_YenEuroinventoryhedgeMember |  |  |  |  |  |  |  |
Maximum term (in years) | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, underlying basis | one-month London Interbank Offering Rates (“LIBOR”) | three-month LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate | 5.41%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeByNatureAxis = wst_ForwardStartInterestRateSwapMember | 5.51%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeByNatureAxis = wst_SwapSeriesBMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date of debt |  | Jul. 28, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative liability, notional amount |  |  |  |  |  | 9.9 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeByNatureAxis = wst_YENUSDinventoryhedgeMember | 1,200.0 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeByNatureAxis = wst_YENUSDinventoryhedgeMember | 6.1 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeByNatureAxis = wst_YenEuroinventoryhedgeMember | 800.0 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeByNatureAxis = wst_YenEuroinventoryhedgeMember |  |  |  |  |  |  |  |
Notional amount, nonderivative instruments |  |  |  |  |  |  |  |  |  | 22.8 us-gaap_NotionalAmountOfNonderivativeInstruments / us-gaap_DerivativeByNatureAxis = us-gaap_DebtMember | 21.0 us-gaap_NotionalAmountOfNonderivativeInstruments / us-gaap_DerivativeByNatureAxis = us-gaap_DebtMember | 4.2 us-gaap_NotionalAmountOfNonderivativeInstruments / us-gaap_DerivativeByNatureAxis = wst_DebtYenDenominatedMember | 500.0 us-gaap_NotionalAmountOfNonderivativeInstruments / us-gaap_DerivativeByNatureAxis = wst_DebtYenDenominatedMember | 66.3 us-gaap_NotionalAmountOfNonderivativeInstruments / us-gaap_DerivativeByNatureAxis = wst_EuroNoteBMember | 61.1 us-gaap_NotionalAmountOfNonderivativeInstruments / us-gaap_DerivativeByNatureAxis = wst_EuroNoteBMember |  |
Cumulative foreign currency translation loss (gain) |  |  |  |  |  |  |  |  |  |  |  | (1.2)wst_TranslationAdjustmentForNetInvestmentHedgePreTax / us-gaap_DerivativeByNatureAxis = wst_DebtYenDenominatedMember |  |  |  | (18.2)wst_TranslationAdjustmentForNetInvestmentHedgePreTax / us-gaap_DerivativeByNatureAxis = wst_EuroDenominatedDebtMember |
Cumulative foreign currency translation loss (gain), net of tax |  |  |  |  |  |  |  |  |  |  |  | (0.8)us-gaap_TranslationAdjustmentForNetInvestmentHedgeNetOfTax / us-gaap_DerivativeByNatureAxis = wst_DebtYenDenominatedMember |  |  |  | (11.5)us-gaap_TranslationAdjustmentForNetInvestmentHedgeNetOfTax / us-gaap_DerivativeByNatureAxis = wst_EuroDenominatedDebtMember |
Derivative, nonmonetary notional amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 134,700 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_OptionMember
Premium paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.1 us-gaap_DerivativeCostOfHedge / us-gaap_DerivativeByNatureAxis = us-gaap_OptionMember

X
- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
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- Definition The premium (cost) of a hedge, expensed during the period. + References No definition available. + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Definition Nominal or face amount used to calculate payments on the derivative liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
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- Details
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- Definition Reference to the index or unit of measurement for the underlying which establishes the pricing terms of the derivative instrument. For example, the basis on the underlying for a natural gas futures contract might be the NYMEX price per million British thermal units (MMBtu). + References No definition available. + Details
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- Definition Maximum period the entity is hedging its exposure to the variability in future cash flows for forecasted transactions, excluding those forecasted transactions related to the payment of variable interest on existing financial instruments, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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- Definition Nominal or face amount used to calculate payments on a nonderivative instrument. + References No definition available. + Details
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- Definition Cumulative adjustment resulting from gains and losses on foreign currency derivatives that are designated as, and are effective as, hedges of a net investment in a foreign entity, commencing as of the designation date. Adjustment reported in equity as part of accumulated other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b),(c) -URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32211-110900 + Details
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- Definition Pre-tax cumulative adjustment resulting from gains and losses on foreign currency derivatives that are designated as, and are effective as, hedges of a net investment in a foreign entity, commencing as of the designation date. Adjustment reported in equity as part of accumulated other comprehensive income. + References No definition available. + Details
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