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| | <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_8cbf0c88-6aa4-401a-8d39-6e7ec40a81f7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractWithCustomerLiabilityNoncurrent"/> |
| | <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ContractWithCustomerLiability_2a459c1f-93c2-4654-9b1c-0e04c345a522" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_8cbf0c88-6aa4-401a-8d39-6e7ec40a81f7" xlink:type="arc"/> |
| | <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_24cff309-846a-47cf-bbf7-579922cd50b6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractWithCustomerLiabilityCurrent"/> |
| | <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ContractWithCustomerLiability_2a459c1f-93c2-4654-9b1c-0e04c345a522" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_24cff309-846a-47cf-bbf7-579922cd50b6" xlink:type="arc"/> |
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| | <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_4bc9bece-346e-4c1e-89ae-caef7c297b2c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/> |
| | <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_732077b3-fa20-4e31-b8f6-9e154da9c865" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/> |
| | <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_4bc9bece-346e-4c1e-89ae-caef7c297b2c" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_732077b3-fa20-4e31-b8f6-9e154da9c865" xlink:type="arc"/> |
| | <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_14ba17f5-73ef-41ee-ad08-2cd9ec26edbe" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements"/> |
| | <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_4bc9bece-346e-4c1e-89ae-caef7c297b2c" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_14ba17f5-73ef-41ee-ad08-2cd9ec26edbe" xlink:type="arc"/> |
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| | <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_0ae7f4d7-4966-4f06-922a-341f5c4609e7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InventoryNet"/> |
| | <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryFinishedGoodsNetOfReserves_10dce685-a5cc-4108-b98f-a7ce2b663059" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InventoryFinishedGoodsNetOfReserves"/> |
| | <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_0ae7f4d7-4966-4f06-922a-341f5c4609e7" xlink:to="loc_us-gaap_InventoryFinishedGoodsNetOfReserves_10dce685-a5cc-4108-b98f-a7ce2b663059" xlink:type="arc"/> |
| | <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryWorkInProcessNetOfReserves_d8129b74-5fb3-4cf9-882b-12b594bcf1bf" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InventoryWorkInProcessNetOfReserves"/> |
| | <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_0ae7f4d7-4966-4f06-922a-341f5c4609e7" xlink:to="loc_us-gaap_InventoryWorkInProcessNetOfReserves_d8129b74-5fb3-4cf9-882b-12b594bcf1bf" xlink:type="arc"/> |
| | <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryRawMaterialsNetOfReserves_29cc1467-b027-4709-8c99-58351d03b874" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InventoryRawMaterialsNetOfReserves"/> |
| | <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_0ae7f4d7-4966-4f06-922a-341f5c4609e7" xlink:to="loc_us-gaap_InventoryRawMaterialsNetOfReserves_29cc1467-b027-4709-8c99-58351d03b874" xlink:type="arc"/> |
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| | <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseCost_b5d256ee-75bd-4afa-8558-dea14cc9d701" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LeaseCost"/> |
| | <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseCost_a94e99d1-2777-4586-82c8-fb389e01786d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseCost"/> |
| | <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_b5d256ee-75bd-4afa-8558-dea14cc9d701" xlink:to="loc_us-gaap_OperatingLeaseCost_a94e99d1-2777-4586-82c8-fb389e01786d" xlink:type="arc"/> |
| | <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermLeaseCost_63a210d7-d3ff-4ebe-b812-8618e479e2b5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShortTermLeaseCost"/> |
| | <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_b5d256ee-75bd-4afa-8558-dea14cc9d701" xlink:to="loc_us-gaap_ShortTermLeaseCost_63a210d7-d3ff-4ebe-b812-8618e479e2b5" xlink:type="arc"/> |
| | <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableLeaseCost_69eaa2b6-2671-4aab-93be-e2ac72bf4a31" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VariableLeaseCost"/> |
| | <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_b5d256ee-75bd-4afa-8558-dea14cc9d701" xlink:to="loc_us-gaap_VariableLeaseCost_69eaa2b6-2671-4aab-93be-e2ac72bf4a31" xlink:type="arc"/> |
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| <link:calculationLink xlink:role="http://www.westpharma.com/role/LeasesMaturitiesofOperatingLeaseLiabilitiesDetails" xlink:type="extended"> |
| | <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_0912225b-9dc3-4473-9c72-8dd13d1da5c1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/> |
| | <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_0da43e8a-9d57-4515-b46e-f97ace8cb7ce" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear"/> |
| | <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_0912225b-9dc3-4473-9c72-8dd13d1da5c1" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_0da43e8a-9d57-4515-b46e-f97ace8cb7ce" xlink:type="arc"/> |
| | <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_d4a26ac4-0a4f-4d2e-9b9b-0eeec4088284" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths"/> |
| | <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_0912225b-9dc3-4473-9c72-8dd13d1da5c1" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_d4a26ac4-0a4f-4d2e-9b9b-0eeec4088284" xlink:type="arc"/> |
| | <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_a4628405-d83d-4135-a64b-7612a7547f1f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo"/> |
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| | <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_ae6fc56c-e6ed-4482-86b1-12105a7bd719" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree"/> |
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| | <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_6cdf6b7f-82e0-406f-a822-40ef4342f5b2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour"/> |
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| | <link:loc xlink:type="locator" xlink:label="loc_wst_LesseeOperatingLeaseLiabilityToBePaidAfterYearFour_5cacabeb-cad4-43f1-9997-b6a60655649a" xlink:href="wst-20220331.xsd#wst_LesseeOperatingLeaseLiabilityToBePaidAfterYearFour"/> |
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| | <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_da692a81-73c6-4e20-a3ea-2b84bcbd1f69" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive"/> |
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| | <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_a0d26671-81b3-45b3-beb1-11162ebee59c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive"/> |
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| | <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_80a4c32e-6742-43f3-9991-a538a334213c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount"/> |
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| | <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnamortizedDebtIssuanceExpense_8c94ba10-74ce-4d1a-87f7-8a29110bb907" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_UnamortizedDebtIssuanceExpense"/> |
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