XML 49 R39.htm IDEA: XBRL DOCUMENT
v3.22.1

Revenue - Revenue Recognition (Details) - Revenue Benchmark | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Customer Concentration Risk |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk, percentage | 100.00% | 100.00%
Product Concentration Risk |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk, percentage | 100.00% | 100.00%
Geographic Concentration Risk |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk, percentage | 100.00% | 100.00%
Americas | Geographic Concentration Risk |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk, percentage | 45.00% | 46.00%
Europe, Middle East, Africa | Geographic Concentration Risk |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk, percentage | 45.00% | 44.00%
Asia Pacific | Geographic Concentration Risk |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk, percentage | 10.00% | 10.00%
High-Value Product Components | Product Concentration Risk |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk, percentage | 56.00% | 52.00%
High-Value Product Delivery Devices | Product Concentration Risk |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk, percentage | 5.00% | 5.00%
Standard Packaging | Product Concentration Risk |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk, percentage | 23.00% | 24.00%
Contract-Manufactured Products | Product Concentration Risk |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk, percentage | 16.00% | 19.00%
Biologics | Customer Concentration Risk |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk, percentage | 43.00% | 39.00%
Generics | Customer Concentration Risk |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk, percentage | 17.00% | 18.00%
Pharma | Customer Concentration Risk |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk, percentage | 24.00% | 24.00%
Contract-Manufactured Products | Customer Concentration Risk |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk, percentage | 16.00% | 19.00%

X
- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9054-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13531-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13537-108611 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
Name: | us-gaap_ConcentrationRiskPercentage1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DisaggregationOfRevenueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CustomerConcentrationRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=us-gaap_ProductConcentrationRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=us-gaap_GeographicConcentrationRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=srt_AmericasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=us-gaap_EMEAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=srt_AsiaPacificMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=wst_HighValueProductComponentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=wst_HighValueProductDeliveryDevicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=wst_StandardPackagingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=wst_ContractManufacturedProductsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MajorCustomersAxis=wst_BiologicsCustomersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MajorCustomersAxis=wst_GenericsCustomersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MajorCustomersAxis=wst_PharmaCustomersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MajorCustomersAxis=wst_ContractManufacturedCustomersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |