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Revenue - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2024 USD ($)
Revenue from Contract with Customer [Abstract] |
Revenue recognized during the period | $ 94.8
Revenue recognized that was included in the deferred income balance | 37.7
Cash payments received in advance | $ 132.8

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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-8 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Contract With Customer, Liability, Increase (Decrease) Due To Additional Cash Payments + References No definition available. + Details
Name: | wst_ContractWithCustomerLiabilityIncreaseDecreaseDueToAdditionalCashPayments
Namespace Prefix: | wst_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Contract with Customer, Liability, Revenue Recognized, Excluding Opening Balance + References No definition available. + Details
Name: | wst_ContractWithCustomerLiabilityRevenueRecognizedExcludingOpeningBalance
Namespace Prefix: | wst_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration