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    <link:label id="lab_wst_SharebasedCompensationPlanModificationAcceleratedCompensationCost_673A4AACF3812304B8F2F520643BD41C_documentation_en-US" xlink:label="lab_wst_SharebasedCompensationPlanModificationAcceleratedCompensationCost_673A4AACF3812304B8F2F520643BD41C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Relates to executive retirements. Includes both an excess of the fair value of the modified awards over the fair value of the awards immediately before the modification, and additional share-based compensation cost recognized as a result of an occurrence of an event that accelerates its recognition.</link:label>
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    <link:label id="lab_us-gaap_DeferredRevenue_DD3BA91E67CFB58F7B33F520643BAE23_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredRevenue_DD3BA91E67CFB58F7B33F520643BAE23" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Nonrefundable payment from customer</link:label>
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    <link:label id="lab_us-gaap_DeferredRevenueCurrent_05A1C584787A90DB4636F520643B7C19_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredRevenueCurrent_05A1C584787A90DB4636F520643B7C19" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unearned income, current</link:label>
    <link:label id="lab_us-gaap_DeferredRevenueCurrent_05A1C584787A90DB4636F520643B7C19_label_en-US" xlink:label="lab_us-gaap_DeferredRevenueCurrent_05A1C584787A90DB4636F520643B7C19" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Revenue, Current</link:label>
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    <link:label id="lab_us-gaap_DeferredRevenueNoncurrent_846CB545B8F79E7F3424F520643B32E8_label_en-US" xlink:label="lab_us-gaap_DeferredRevenueNoncurrent_846CB545B8F79E7F3424F520643B32E8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Revenue, Noncurrent</link:label>
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    <link:label id="lab_wst_DevelopmentIncome_BE935425A997F5B757D0F520643B839D_terseLabel_en-US" xlink:label="lab_wst_DevelopmentIncome_BE935425A997F5B757D0F520643B839D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Development income</link:label>
    <link:label id="lab_wst_DevelopmentIncome_BE935425A997F5B757D0F520643B839D_label_en-US" xlink:label="lab_wst_DevelopmentIncome_BE935425A997F5B757D0F520643B839D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Development Income</link:label>
    <link:label id="lab_wst_DevelopmentIncome_BE935425A997F5B757D0F520643B839D_documentation_en-US" xlink:label="lab_wst_DevelopmentIncome_BE935425A997F5B757D0F520643B839D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The amount of consideration recognized during the period under a development, licensing and supply agreement entered into with a customer.</link:label>
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    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_87D7FE71745AC523D3F6F4C70D10AF4C_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_87D7FE71745AC523D3F6F4C70D10AF4C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Shares available for issuance under the 2011 Plan (in shares)</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_87D7FE71745AC523D3F6F4C70D10AF4C" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_87D7FE71745AC523D3F6F4C70D10AF4C" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_E795629D94DC42866F3DF4C70D109229_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_E795629D94DC42866F3DF4C70D109229" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stock options, granted (in shares)</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_E795629D94DC42866F3DF4C70D109229" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_E795629D94DC42866F3DF4C70D109229" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_E795629D94DC42866F3DF4C70D109229" xlink:type="arc" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_480EFBBF3360459488FEF4C70D108FFD" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_B3CC67E9FC2B24D86B70F4C70D106EDC_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_B3CC67E9FC2B24D86B70F4C70D106EDC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stock options, weighted average grant date fair value (in dollars per share)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_B3CC67E9FC2B24D86B70F4C70D106EDC_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_B3CC67E9FC2B24D86B70F4C70D106EDC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_B3CC67E9FC2B24D86B70F4C70D106EDC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_B3CC67E9FC2B24D86B70F4C70D106EDC" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_B3CC67E9FC2B24D86B70F4C70D106EDC" xlink:type="arc" />
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_18535A2FA427F0F98D1AF4C70D107DF3" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_18535A2FA427F0F98D1AF4C70D107DF3" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_8ED426A3F43AEB19D1C5F4C70D10B7F5_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_8ED426A3F43AEB19D1C5F4C70D10B7F5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Risk-free interest rate (in hundredths)</link:label>
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    <link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_72245A64CD24532406E0F4C70D10ADD4_terseLabel_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_72245A64CD24532406E0F4C70D10ADD4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Expected life (in years)</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_72245A64CD24532406E0F4C70D10ADD4" xlink:to="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_72245A64CD24532406E0F4C70D10ADD4" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_1D6AA814E1BABACC4381F4C70D10762E_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_1D6AA814E1BABACC4381F4C70D10762E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stock volatility (in hundredths)</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_1D6AA814E1BABACC4381F4C70D10762E" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_47F156918D320F1CF13BF4C70D10FA58_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_47F156918D320F1CF13BF4C70D10FA58" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Dividend yield (in hundredths)</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_47F156918D320F1CF13BF4C70D10FA58" xlink:type="locator" />
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    <link:label id="lab_wst_CommonStockPerPvsAward_AD3AE09F1F8FC7C2BFF1F4C70D103F7B_verboseLabel_en-US" xlink:label="lab_wst_CommonStockPerPvsAward_AD3AE09F1F8FC7C2BFF1F4C70D103F7B" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Number of shares of common stock per PVS award (in shares)</link:label>
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    <link:label id="lab_wst_PvsPayoutMinimum_DE27B45BDB1D68CF87AAF4C70D10E38E_verboseLabel_en-US" xlink:label="lab_wst_PvsPayoutMinimum_DE27B45BDB1D68CF87AAF4C70D10E38E" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">PVS payout, Minimum (in hundredths)</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_127A7E73143A7F7272EEDF8E1BCF79AA_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_127A7E73143A7F7272EEDF8E1BCF79AA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash flows from operating activities:</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_127A7E73143A7F7272EEDF8E1BCF79AA_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_127A7E73143A7F7272EEDF8E1BCF79AA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Operating Activities [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_127A7E73143A7F7272EEDF8E1BCF79AA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_127A7E73143A7F7272EEDF8E1BCF79AA" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_127A7E73143A7F7272EEDF8E1BCF79AA" xlink:type="arc" />
    <link:label id="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_AEA208D0BFFB4FF5F809DF8E1BCFF1B2_terseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_AEA208D0BFFB4FF5F809DF8E1BCFF1B2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Adjustments to reconcile net income to net cash provided by operating activities:</link:label>
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    <link:label id="lab_us-gaap_Depreciation_E0A552BAE7EB6641AFCDDF8E1BCF8498_terseLabel_en-US" xlink:label="lab_us-gaap_Depreciation_E0A552BAE7EB6641AFCDDF8E1BCF8498" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Depreciation</link:label>
    <link:label id="lab_us-gaap_Depreciation_E0A552BAE7EB6641AFCDDF8E1BCF8498_label_en-US" xlink:label="lab_us-gaap_Depreciation_E0A552BAE7EB6641AFCDDF8E1BCF8498" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Depreciation</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_Depreciation" xlink:label="loc_us-gaap_Depreciation_E0A552BAE7EB6641AFCDDF8E1BCF8498" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AdjustmentForAmortization_9B2AC89BA4AE0F018444DF8E1BCFC795_terseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentForAmortization_9B2AC89BA4AE0F018444DF8E1BCFC795" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amortization</link:label>
    <link:label id="lab_us-gaap_AdjustmentForAmortization_9B2AC89BA4AE0F018444DF8E1BCFC795_label_en-US" xlink:label="lab_us-gaap_AdjustmentForAmortization_9B2AC89BA4AE0F018444DF8E1BCFC795" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Amortization</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AdjustmentForAmortization" xlink:label="loc_us-gaap_AdjustmentForAmortization_9B2AC89BA4AE0F018444DF8E1BCFC795" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ShareBasedCompensation_D777FBFC13FE9A8A7167DF8E1BCF633C_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensation_D777FBFC13FE9A8A7167DF8E1BCF633C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stock-based compensation</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensation_D777FBFC13FE9A8A7167DF8E1BCF633C_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensation_D777FBFC13FE9A8A7167DF8E1BCF633C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaap_ShareBasedCompensation_D777FBFC13FE9A8A7167DF8E1BCF633C" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OtherNoncashIncomeExpense_B2387FE88E2180E3D43EDF8E1BCFECBD_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_OtherNoncashIncomeExpense_B2387FE88E2180E3D43EDF8E1BCFECBD" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Other non-cash items, net</link:label>
    <link:label id="lab_us-gaap_OtherNoncashIncomeExpense_B2387FE88E2180E3D43EDF8E1BCFECBD_label_en-US" xlink:label="lab_us-gaap_OtherNoncashIncomeExpense_B2387FE88E2180E3D43EDF8E1BCFECBD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Noncash Income (Expense)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherNoncashIncomeExpense" xlink:label="loc_us-gaap_OtherNoncashIncomeExpense_B2387FE88E2180E3D43EDF8E1BCFECBD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherNoncashIncomeExpense_B2387FE88E2180E3D43EDF8E1BCFECBD" xlink:to="lab_us-gaap_OtherNoncashIncomeExpense_B2387FE88E2180E3D43EDF8E1BCFECBD" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_927D5131AA4738936D0DDF8E1BCFEE5C_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_927D5131AA4738936D0DDF8E1BCFEE5C" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Changes in assets and liabilities</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_927D5131AA4738936D0DDF8E1BCFEE5C_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_927D5131AA4738936D0DDF8E1BCFEE5C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Other Operating Assets and Liabilities, Net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_927D5131AA4738936D0DDF8E1BCFEE5C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_927D5131AA4738936D0DDF8E1BCFEE5C" xlink:to="lab_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_927D5131AA4738936D0DDF8E1BCFEE5C" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_1DC2D57011EB54841589DF8E1BCFD0C1_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_1DC2D57011EB54841589DF8E1BCFD0C1" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash provided by operating activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_1DC2D57011EB54841589DF8E1BCFD0C1_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_1DC2D57011EB54841589DF8E1BCFD0C1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Operating Activities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1DC2D57011EB54841589DF8E1BCFD0C1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1DC2D57011EB54841589DF8E1BCFD0C1" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_1DC2D57011EB54841589DF8E1BCFD0C1" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_50529BF331B2C30A7661DF8E1BCFC70D_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_50529BF331B2C30A7661DF8E1BCFC70D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash flows from investing activities:</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_50529BF331B2C30A7661DF8E1BCFC70D_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_50529BF331B2C30A7661DF8E1BCFC70D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Investing Activities [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_50529BF331B2C30A7661DF8E1BCFC70D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_50529BF331B2C30A7661DF8E1BCFC70D" xlink:to="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_50529BF331B2C30A7661DF8E1BCFC70D" xlink:type="arc" />
    <link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_DCD757629B7F20D18D58DF8E1BCF5A14_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_DCD757629B7F20D18D58DF8E1BCF5A14" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Capital expenditures</link:label>
    <link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_DCD757629B7F20D18D58DF8E1BCF5A14_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_DCD757629B7F20D18D58DF8E1BCF5A14" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments to Acquire Property, Plant, and Equipment</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_DCD757629B7F20D18D58DF8E1BCF5A14" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_DCD757629B7F20D18D58DF8E1BCF5A14" xlink:to="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_DCD757629B7F20D18D58DF8E1BCF5A14" xlink:type="arc" />
    <link:label id="lab_us-gaap_PaymentsToAcquireMarketableSecurities_FE305676B0A604D6D167DF8E1BCFDF1B_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireMarketableSecurities_FE305676B0A604D6D167DF8E1BCFDF1B" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Purchases of short-term investments</link:label>
    <link:label id="lab_us-gaap_PaymentsToAcquireMarketableSecurities_FE305676B0A604D6D167DF8E1BCFDF1B_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireMarketableSecurities_FE305676B0A604D6D167DF8E1BCFDF1B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments to Acquire Marketable Securities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PaymentsToAcquireMarketableSecurities" xlink:label="loc_us-gaap_PaymentsToAcquireMarketableSecurities_FE305676B0A604D6D167DF8E1BCFDF1B" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities_56DB97807BE1CEB442ACDF8E1BCF0495_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities_56DB97807BE1CEB442ACDF8E1BCF0495" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Sales and maturities of short-term investments</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_EAD7C046E46901384118DF8E1BCF6824_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_EAD7C046E46901384118DF8E1BCF6824" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash used in investing activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_EAD7C046E46901384118DF8E1BCF6824_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_EAD7C046E46901384118DF8E1BCF6824" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Investing Activities</link:label>
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    <link:label id="lab_us-gaap_DerivativeNameDomain_1862EF99DBC7E91BA3F7F3ABC038654D_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeNameDomain_1862EF99DBC7E91BA3F7F3ABC038654D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative, Name [Domain]</link:label>
    <link:label id="lab_us-gaap_DerivativeNameDomain_1862EF99DBC7E91BA3F7F3ABC038654D_label_en-US" xlink:label="lab_us-gaap_DerivativeNameDomain_1862EF99DBC7E91BA3F7F3ABC038654D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative, Name [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DerivativeNameDomain" xlink:label="loc_us-gaap_DerivativeNameDomain_1862EF99DBC7E91BA3F7F3ABC038654D" xlink:type="locator" />
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    <link:label id="lab_wst_ForwardStartInterestRateSwapMember_8B720696F6EF19EBAC61F3ABC038AD31_terseLabel_en-US" xlink:label="lab_wst_ForwardStartInterestRateSwapMember_8B720696F6EF19EBAC61F3ABC038AD31" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Forward-Start Interest Rate Swap [Member]</link:label>
    <link:label id="lab_wst_ForwardStartInterestRateSwapMember_8B720696F6EF19EBAC61F3ABC038AD31_label_en-US" xlink:label="lab_wst_ForwardStartInterestRateSwapMember_8B720696F6EF19EBAC61F3ABC038AD31" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Forward Start Interest Rate Swap [Member]</link:label>
    <link:label id="lab_wst_ForwardStartInterestRateSwapMember_8B720696F6EF19EBAC61F3ABC038AD31_documentation_en-US" xlink:label="lab_wst_ForwardStartInterestRateSwapMember_8B720696F6EF19EBAC61F3ABC038AD31" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Forward-start interest rate swap</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_wst_ForwardStartInterestRateSwapMember_8B720696F6EF19EBAC61F3ABC038AD31" xlink:to="lab_wst_ForwardStartInterestRateSwapMember_8B720696F6EF19EBAC61F3ABC038AD31" xlink:type="arc" />
    <link:label id="lab_wst_SwapSeriesBMember_908AB50F86C56399D2F0F3ABC0384404_terseLabel_en-US" xlink:label="lab_wst_SwapSeriesBMember_908AB50F86C56399D2F0F3ABC0384404" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest Rate Swap, Series B Note [Member]</link:label>
    <link:label id="lab_wst_SwapSeriesBMember_908AB50F86C56399D2F0F3ABC0384404_label_en-US" xlink:label="lab_wst_SwapSeriesBMember_908AB50F86C56399D2F0F3ABC0384404" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Swap Series B [Member]</link:label>
    <link:label id="lab_wst_SwapSeriesBMember_908AB50F86C56399D2F0F3ABC0384404_documentation_en-US" xlink:label="lab_wst_SwapSeriesBMember_908AB50F86C56399D2F0F3ABC0384404" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">A forward-based contract in which two parties agree to swap streams of payments over a specified period. The payment streams are based on an agreed-upon (or notional) principal amount. The term notional is used because swap contracts generally involve no exchange of principal at either inception or maturity. Rather, the notional amount serves as a basis for calculation of the payment streams to be exchanged.</link:label>
    <link:loc xlink:href="wst-20150630.xsd#wst_SwapSeriesBMember" xlink:label="loc_wst_SwapSeriesBMember_908AB50F86C56399D2F0F3ABC0384404" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_wst_SwapSeriesBMember_908AB50F86C56399D2F0F3ABC0384404" xlink:to="lab_wst_SwapSeriesBMember_908AB50F86C56399D2F0F3ABC0384404" xlink:type="arc" />
    <link:label id="lab_wst_USDinventorypurchasehedgeMember_29450B7265FA3EEEDF2AF3ABC0389668_terseLabel_en-US" xlink:label="lab_wst_USDinventorypurchasehedgeMember_29450B7265FA3EEEDF2AF3ABC0389668" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Foreign Currency Hedge - USD Inventory Purchases, Euro Sub [Member]</link:label>
    <link:label id="lab_wst_USDinventorypurchasehedgeMember_29450B7265FA3EEEDF2AF3ABC0389668_label_en-US" xlink:label="lab_wst_USDinventorypurchasehedgeMember_29450B7265FA3EEEDF2AF3ABC0389668" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">USD inventory purchase hedge [Member]</link:label>
    <link:label id="lab_wst_USDinventorypurchasehedgeMember_29450B7265FA3EEEDF2AF3ABC0389668_documentation_en-US" xlink:label="lab_wst_USDinventorypurchasehedgeMember_29450B7265FA3EEEDF2AF3ABC0389668" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">USD inventory purchase hedge [Member]</link:label>
    <link:loc xlink:href="wst-20150630.xsd#wst_USDinventorypurchasehedgeMember" xlink:label="loc_wst_USDinventorypurchasehedgeMember_29450B7265FA3EEEDF2AF3ABC0389668" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_wst_USDinventorypurchasehedgeMember_29450B7265FA3EEEDF2AF3ABC0389668" xlink:to="lab_wst_USDinventorypurchasehedgeMember_29450B7265FA3EEEDF2AF3ABC0389668" xlink:type="arc" />
    <link:label id="lab_wst_EuroUSDFxContractMember_B244324ED772800F4E68F3ABC0381FEA_terseLabel_en-US" xlink:label="lab_wst_EuroUSDFxContractMember_B244324ED772800F4E68F3ABC0381FEA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Foreign Currency Hedge - Euro Sales, U.S. Sub [Member]</link:label>
    <link:label id="lab_wst_EuroUSDFxContractMember_B244324ED772800F4E68F3ABC0381FEA_label_en-US" xlink:label="lab_wst_EuroUSDFxContractMember_B244324ED772800F4E68F3ABC0381FEA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Euro USD Fx Contract [Member]</link:label>
    <link:label id="lab_wst_EuroUSDFxContractMember_B244324ED772800F4E68F3ABC0381FEA_documentation_en-US" xlink:label="lab_wst_EuroUSDFxContractMember_B244324ED772800F4E68F3ABC0381FEA" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Euro USD Fx Contract [Member]</link:label>
    <link:loc xlink:href="wst-20150630.xsd#wst_EuroUSDFxContractMember" xlink:label="loc_wst_EuroUSDFxContractMember_B244324ED772800F4E68F3ABC0381FEA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_wst_EuroUSDFxContractMember_B244324ED772800F4E68F3ABC0381FEA" xlink:to="lab_wst_EuroUSDFxContractMember_B244324ED772800F4E68F3ABC0381FEA" xlink:type="arc" />
    <link:label id="lab_wst_YENUSDinventoryhedgeMember_95B2589E8E1778A86494F3ABC0385DE9_terseLabel_en-US" xlink:label="lab_wst_YENUSDinventoryhedgeMember_95B2589E8E1778A86494F3ABC0385DE9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Foreign Currency Hedge - Yen Inventory Purchases, U.S. [Member]</link:label>
    <link:label id="lab_wst_YENUSDinventoryhedgeMember_95B2589E8E1778A86494F3ABC0385DE9_label_en-US" xlink:label="lab_wst_YENUSDinventoryhedgeMember_95B2589E8E1778A86494F3ABC0385DE9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">YEN - USD inventory hedge [Member]</link:label>
    <link:label id="lab_wst_YENUSDinventoryhedgeMember_95B2589E8E1778A86494F3ABC0385DE9_documentation_en-US" xlink:label="lab_wst_YENUSDinventoryhedgeMember_95B2589E8E1778A86494F3ABC0385DE9" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">YEN - USD inventory hedge [Member]</link:label>
    <link:loc xlink:href="wst-20150630.xsd#wst_YENUSDinventoryhedgeMember" xlink:label="loc_wst_YENUSDinventoryhedgeMember_95B2589E8E1778A86494F3ABC0385DE9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_wst_YENUSDinventoryhedgeMember_95B2589E8E1778A86494F3ABC0385DE9" xlink:to="lab_wst_YENUSDinventoryhedgeMember_95B2589E8E1778A86494F3ABC0385DE9" xlink:type="arc" />
    <link:label id="lab_wst_YenEuroinventoryhedgeMember_B8F6D92ED4730BF4A2FAF3ABC038D7E4_terseLabel_en-US" xlink:label="lab_wst_YenEuroinventoryhedgeMember_B8F6D92ED4730BF4A2FAF3ABC038D7E4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Foreign Currency Hedge - Yen Inventory Purchases, Euro Sub [Member]</link:label>
    <link:label id="lab_wst_YenEuroinventoryhedgeMember_B8F6D92ED4730BF4A2FAF3ABC038D7E4_label_en-US" xlink:label="lab_wst_YenEuroinventoryhedgeMember_B8F6D92ED4730BF4A2FAF3ABC038D7E4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Yen - Euro inventory hedge [Member]</link:label>
    <link:label id="lab_wst_YenEuroinventoryhedgeMember_B8F6D92ED4730BF4A2FAF3ABC038D7E4_documentation_en-US" xlink:label="lab_wst_YenEuroinventoryhedgeMember_B8F6D92ED4730BF4A2FAF3ABC038D7E4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Yen - Euro inventory hedge [Member]</link:label>
    <link:loc xlink:href="wst-20150630.xsd#wst_YenEuroinventoryhedgeMember" xlink:label="loc_wst_YenEuroinventoryhedgeMember_B8F6D92ED4730BF4A2FAF3ABC038D7E4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_wst_YenEuroinventoryhedgeMember_B8F6D92ED4730BF4A2FAF3ABC038D7E4" xlink:to="lab_wst_YenEuroinventoryhedgeMember_B8F6D92ED4730BF4A2FAF3ABC038D7E4" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtMember_48359140E4B8F3760EA8F3ABC03814CE_terseLabel_en-US" xlink:label="lab_us-gaap_DebtMember_48359140E4B8F3760EA8F3ABC03814CE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Euro-Denominated Revolver [Member]</link:label>
    <link:label id="lab_us-gaap_DebtMember_48359140E4B8F3760EA8F3ABC03814CE_label_en-US" xlink:label="lab_us-gaap_DebtMember_48359140E4B8F3760EA8F3ABC03814CE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtMember" xlink:label="loc_us-gaap_DebtMember_48359140E4B8F3760EA8F3ABC03814CE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtMember_48359140E4B8F3760EA8F3ABC03814CE" xlink:to="lab_us-gaap_DebtMember_48359140E4B8F3760EA8F3ABC03814CE" xlink:type="arc" />
    <link:label id="lab_wst_DebtYenDenominatedMember_DEC1340BBE0587A15C32F3ABC038BA7A_terseLabel_en-US" xlink:label="lab_wst_DebtYenDenominatedMember_DEC1340BBE0587A15C32F3ABC038BA7A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Yen-Denominated Revolver [Member]</link:label>
    <link:label id="lab_wst_DebtYenDenominatedMember_DEC1340BBE0587A15C32F3ABC038BA7A_label_en-US" xlink:label="lab_wst_DebtYenDenominatedMember_DEC1340BBE0587A15C32F3ABC038BA7A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Yen Denominated [Member]</link:label>
    <link:label id="lab_wst_DebtYenDenominatedMember_DEC1340BBE0587A15C32F3ABC038BA7A_documentation_en-US" xlink:label="lab_wst_DebtYenDenominatedMember_DEC1340BBE0587A15C32F3ABC038BA7A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">An obligation resulting from borrowing money.</link:label>
    <link:loc xlink:href="wst-20150630.xsd#wst_DebtYenDenominatedMember" xlink:label="loc_wst_DebtYenDenominatedMember_DEC1340BBE0587A15C32F3ABC038BA7A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_wst_DebtYenDenominatedMember_DEC1340BBE0587A15C32F3ABC038BA7A" xlink:to="lab_wst_DebtYenDenominatedMember_DEC1340BBE0587A15C32F3ABC038BA7A" xlink:type="arc" />
    <link:label id="lab_wst_EuroNoteBMember_4E7F7B0D8B14A595E2AEF3ABC038259F_terseLabel_en-US" xlink:label="lab_wst_EuroNoteBMember_4E7F7B0D8B14A595E2AEF3ABC038259F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Euro Note B [Member]</link:label>
    <link:label id="lab_wst_EuroNoteBMember_4E7F7B0D8B14A595E2AEF3ABC038259F_label_en-US" xlink:label="lab_wst_EuroNoteBMember_4E7F7B0D8B14A595E2AEF3ABC038259F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Euro Note B [Member]</link:label>
    <link:label id="lab_wst_EuroNoteBMember_4E7F7B0D8B14A595E2AEF3ABC038259F_documentation_en-US" xlink:label="lab_wst_EuroNoteBMember_4E7F7B0D8B14A595E2AEF3ABC038259F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Contractual obligation to pay money on demand or on fixed or determinable dates.</link:label>
    <link:loc xlink:href="wst-20150630.xsd#wst_EuroNoteBMember" xlink:label="loc_wst_EuroNoteBMember_4E7F7B0D8B14A595E2AEF3ABC038259F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_wst_EuroNoteBMember_4E7F7B0D8B14A595E2AEF3ABC038259F" xlink:to="lab_wst_EuroNoteBMember_4E7F7B0D8B14A595E2AEF3ABC038259F" xlink:type="arc" />
    <link:label id="lab_wst_EuroDenominatedDebtMember_D4DFCDAD9DC37E7C9DD1F3ABC038AA5E_terseLabel_en-US" xlink:label="lab_wst_EuroDenominatedDebtMember_D4DFCDAD9DC37E7C9DD1F3ABC038AA5E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Euro-Denominated Debt [Member]</link:label>
    <link:label id="lab_wst_EuroDenominatedDebtMember_D4DFCDAD9DC37E7C9DD1F3ABC038AA5E_label_en-US" xlink:label="lab_wst_EuroDenominatedDebtMember_D4DFCDAD9DC37E7C9DD1F3ABC038AA5E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Euro-Denominated Debt [Member]</link:label>
    <link:label id="lab_wst_EuroDenominatedDebtMember_D4DFCDAD9DC37E7C9DD1F3ABC038AA5E_documentation_en-US" xlink:label="lab_wst_EuroDenominatedDebtMember_D4DFCDAD9DC37E7C9DD1F3ABC038AA5E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Contractual obligation to pay money on demand or on fixed or determinable dates, Euro-denominated.</link:label>
    <link:loc xlink:href="wst-20150630.xsd#wst_EuroDenominatedDebtMember" xlink:label="loc_wst_EuroDenominatedDebtMember_D4DFCDAD9DC37E7C9DD1F3ABC038AA5E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_wst_EuroDenominatedDebtMember_D4DFCDAD9DC37E7C9DD1F3ABC038AA5E" xlink:to="lab_wst_EuroDenominatedDebtMember_D4DFCDAD9DC37E7C9DD1F3ABC038AA5E" xlink:type="arc" />
    <link:label id="lab_us-gaap_OptionMember_9686CDBC93445563190EF3ABC0387311_terseLabel_en-US" xlink:label="lab_us-gaap_OptionMember_9686CDBC93445563190EF3ABC0387311" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Options Held [Member]</link:label>
    <link:label id="lab_us-gaap_OptionMember_9686CDBC93445563190EF3ABC0387311_label_en-US" xlink:label="lab_us-gaap_OptionMember_9686CDBC93445563190EF3ABC0387311" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Options Held [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OptionMember" xlink:label="loc_us-gaap_OptionMember_9686CDBC93445563190EF3ABC0387311" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OptionMember_9686CDBC93445563190EF3ABC0387311" xlink:to="lab_us-gaap_OptionMember_9686CDBC93445563190EF3ABC0387311" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeLineItems_4645FE48C6C88F71E1B5F3ABC0387134_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeLineItems_4645FE48C6C88F71E1B5F3ABC0387134" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative [Line Items]</link:label>
    <link:label id="lab_us-gaap_DerivativeLineItems_4645FE48C6C88F71E1B5F3ABC0387134_label_en-US" xlink:label="lab_us-gaap_DerivativeLineItems_4645FE48C6C88F71E1B5F3ABC0387134" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DerivativeLineItems" xlink:label="loc_us-gaap_DerivativeLineItems_4645FE48C6C88F71E1B5F3ABC0387134" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeLineItems_4645FE48C6C88F71E1B5F3ABC0387134" xlink:to="lab_us-gaap_DerivativeLineItems_4645FE48C6C88F71E1B5F3ABC0387134" xlink:type="arc" />
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    <link:label id="lab_wst_TermLoanDue2018Member_BA093056465FC4AEEAD3E4504E61F98C_terseLabel_en-US" xlink:label="lab_wst_TermLoanDue2018Member_BA093056465FC4AEEAD3E4504E61F98C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Term Loan Due 2018 [Member]</link:label>
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    <link:label id="lab_wst_TermLoanDue2018Member_BA093056465FC4AEEAD3E4504E61F98C_documentation_en-US" xlink:label="lab_wst_TermLoanDue2018Member_BA093056465FC4AEEAD3E4504E61F98C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Term Loan Due 2018 [Member]</link:label>
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    <link:label id="lab_us-gaap_LongTermDebt_E012921FA14C4B41C810E4504E61D68B_label_en-US" xlink:label="lab_us-gaap_LongTermDebt_E012921FA14C4B41C810E4504E61D68B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt</link:label>
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    <link:label id="lab_us-gaap_LongTermDebtCurrent_B8D84BA6D906553C13C5E4504E61B6D0_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtCurrent_B8D84BA6D906553C13C5E4504E61B6D0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Current portion of long-term debt</link:label>
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