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    <link:label id="lab_us-gaap_DesignatedAsHedgingInstrumentMember_143102E4C9015F049CAE8A9122D39970_terseLabel_en-US" xlink:label="lab_us-gaap_DesignatedAsHedgingInstrumentMember_143102E4C9015F049CAE8A9122D39970" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Designated as Hedging Instrument [Member]</link:label>
    <link:label id="lab_us-gaap_DesignatedAsHedgingInstrumentMember_143102E4C9015F049CAE8A9122D39970_label_en-US" xlink:label="lab_us-gaap_DesignatedAsHedgingInstrumentMember_143102E4C9015F049CAE8A9122D39970" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Designated as Hedging Instrument [Member]</link:label>
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    <link:label id="lab_us-gaap_CurrencyAxis_2B9F88D03DF239FF405D8A9122D35A88_terseLabel_en-US" xlink:label="lab_us-gaap_CurrencyAxis_2B9F88D03DF239FF405D8A9122D35A88" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Currency [Axis]</link:label>
    <link:label id="lab_us-gaap_CurrencyAxis_2B9F88D03DF239FF405D8A9122D35A88_label_en-US" xlink:label="lab_us-gaap_CurrencyAxis_2B9F88D03DF239FF405D8A9122D35A88" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Currency [Axis]</link:label>
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    <link:label id="lab_currency_AllCurrenciesDomain_225B423EB4D4F3C4394A8A9122D333CD_terseLabel_en-US" xlink:label="lab_currency_AllCurrenciesDomain_225B423EB4D4F3C4394A8A9122D333CD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">All Currencies [Domain]</link:label>
    <link:label id="lab_currency_AllCurrenciesDomain_225B423EB4D4F3C4394A8A9122D333CD_label_en-US" xlink:label="lab_currency_AllCurrenciesDomain_225B423EB4D4F3C4394A8A9122D333CD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">All Currencies [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.sec.gov/currency/2016/currency-2016-01-31.xsd#currency_AllCurrenciesDomain" xlink:label="loc_currency_AllCurrenciesDomain_225B423EB4D4F3C4394A8A9122D333CD" xlink:type="locator" />
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    <link:label id="lab_currency_SGD_38CE5ECB2362B04F57BD8A9122D3632B_terseLabel_en-US" xlink:label="lab_currency_SGD_38CE5ECB2362B04F57BD8A9122D3632B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Singapore, Dollars</link:label>
    <link:label id="lab_currency_SGD_38CE5ECB2362B04F57BD8A9122D3632B_label_en-US" xlink:label="lab_currency_SGD_38CE5ECB2362B04F57BD8A9122D3632B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Singapore, Dollars</link:label>
    <link:loc xlink:href="http://xbrl.sec.gov/currency/2016/currency-2016-01-31.xsd#currency_SGD" xlink:label="loc_currency_SGD_38CE5ECB2362B04F57BD8A9122D3632B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_currency_SGD_38CE5ECB2362B04F57BD8A9122D3632B" xlink:to="lab_currency_SGD_38CE5ECB2362B04F57BD8A9122D3632B" xlink:type="arc" />
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    <link:label id="lab_currency_USD_9D0DFC310C441C4CEAA78A9122D3D814_label_en-US" xlink:label="lab_currency_USD_9D0DFC310C441C4CEAA78A9122D3D814" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">United States of America, Dollars</link:label>
    <link:loc xlink:href="http://xbrl.sec.gov/currency/2016/currency-2016-01-31.xsd#currency_USD" xlink:label="loc_currency_USD_9D0DFC310C441C4CEAA78A9122D3D814" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_currency_USD_9D0DFC310C441C4CEAA78A9122D3D814" xlink:to="lab_currency_USD_9D0DFC310C441C4CEAA78A9122D3D814" xlink:type="arc" />
    <link:label id="lab_currency_JPY_DD1F18167667357D5AB38A9122D371F3_terseLabel_en-US" xlink:label="lab_currency_JPY_DD1F18167667357D5AB38A9122D371F3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Japan, Yen</link:label>
    <link:label id="lab_currency_JPY_DD1F18167667357D5AB38A9122D371F3_label_en-US" xlink:label="lab_currency_JPY_DD1F18167667357D5AB38A9122D371F3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Japan, Yen</link:label>
    <link:loc xlink:href="http://xbrl.sec.gov/currency/2016/currency-2016-01-31.xsd#currency_JPY" xlink:label="loc_currency_JPY_DD1F18167667357D5AB38A9122D371F3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_currency_JPY_DD1F18167667357D5AB38A9122D371F3" xlink:to="lab_currency_JPY_DD1F18167667357D5AB38A9122D371F3" xlink:type="arc" />
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    <link:label id="lab_us-gaap_ForeignExchangeForwardMember_4A53B05E1CAF5CB594738A9122D30827_label_en-US" xlink:label="lab_us-gaap_ForeignExchangeForwardMember_4A53B05E1CAF5CB594738A9122D30827" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Foreign Exchange Forward [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ForeignExchangeForwardMember" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_4A53B05E1CAF5CB594738A9122D30827" xlink:type="locator" />
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    <link:label id="lab_wst_ForwardStartInterestRateSwapMember_6567C1FC44CBEEC664FA8A9122DDAFED_terseLabel_en-US" xlink:label="lab_wst_ForwardStartInterestRateSwapMember_6567C1FC44CBEEC664FA8A9122DDAFED" 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_6567C1FC44CBEEC664FA8A9122DDAFED_label_en-US" xlink:label="lab_wst_ForwardStartInterestRateSwapMember_6567C1FC44CBEEC664FA8A9122DDAFED" 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_6567C1FC44CBEEC664FA8A9122DDAFED_documentation_en-US" xlink:label="lab_wst_ForwardStartInterestRateSwapMember_6567C1FC44CBEEC664FA8A9122DDAFED" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Forward-start interest rate swap</link:label>
    <link:loc xlink:href="wst-20170630.xsd#wst_ForwardStartInterestRateSwapMember" xlink:label="loc_wst_ForwardStartInterestRateSwapMember_6567C1FC44CBEEC664FA8A9122DDAFED" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ForwardContractsMember_1F7CF66340BFA9F4B6478A9122DDD3EC_terseLabel_en-US" xlink:label="lab_us-gaap_ForwardContractsMember_1F7CF66340BFA9F4B6478A9122DDD3EC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Forward Contracts [Member]</link:label>
    <link:label id="lab_us-gaap_ForwardContractsMember_1F7CF66340BFA9F4B6478A9122DDD3EC_label_en-US" xlink:label="lab_us-gaap_ForwardContractsMember_1F7CF66340BFA9F4B6478A9122DDD3EC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Forward Contracts [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ForwardContractsMember" xlink:label="loc_us-gaap_ForwardContractsMember_1F7CF66340BFA9F4B6478A9122DDD3EC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ForwardContractsMember_1F7CF66340BFA9F4B6478A9122DDD3EC" xlink:to="lab_us-gaap_ForwardContractsMember_1F7CF66340BFA9F4B6478A9122DDD3EC" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtMember_A79C1CE01826156CF4928A9122DDBE46_terseLabel_en-US" xlink:label="lab_us-gaap_DebtMember_A79C1CE01826156CF4928A9122DDBE46" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt EUR Denominated [Member]</link:label>
    <link:label id="lab_us-gaap_DebtMember_A79C1CE01826156CF4928A9122DDBE46_label_en-US" xlink:label="lab_us-gaap_DebtMember_A79C1CE01826156CF4928A9122DDBE46" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt [Member]</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_DebtMember_A79C1CE01826156CF4928A9122DDBE46" xlink:to="lab_us-gaap_DebtMember_A79C1CE01826156CF4928A9122DDBE46" xlink:type="arc" />
    <link:label id="lab_wst_DebtYenDenominatedMember_85F1E3C5C1ACE76BC24D8A9122DD0607_terseLabel_en-US" xlink:label="lab_wst_DebtYenDenominatedMember_85F1E3C5C1ACE76BC24D8A9122DD0607" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Yen Denominated [Member]</link:label>
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    <link:label id="lab_wst_DebtYenDenominatedMember_85F1E3C5C1ACE76BC24D8A9122DD0607_documentation_en-US" xlink:label="lab_wst_DebtYenDenominatedMember_85F1E3C5C1ACE76BC24D8A9122DD0607" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">An obligation resulting from borrowing money.</link:label>
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    <link:label id="lab_us-gaap_OptionMember_3837727132DDCAFFE2188A9122DDD2D7_terseLabel_en-US" xlink:label="lab_us-gaap_OptionMember_3837727132DDCAFFE2188A9122DDD2D7" 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_3837727132DDCAFFE2188A9122DDD2D7_label_en-US" xlink:label="lab_us-gaap_OptionMember_3837727132DDCAFFE2188A9122DDD2D7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Options Held [Member]</link:label>
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    <link:label id="lab_wst_PvsPayoutMinimum_7FF11932A0EBB9803C8052498A471A75_documentation_en-US" xlink:label="lab_wst_PvsPayoutMinimum_7FF11932A0EBB9803C8052498A471A75" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Percent of an employee's targeted award to be paid out, Minimum.</link:label>
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    <link:label id="lab_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_028EFEE14E7BBCB025137B0FA70FC352_label_en-US" xlink:label="lab_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_028EFEE14E7BBCB025137B0FA70FC352" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings</link:label>
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