XML 69 R54.htm IDEA: XBRL DOCUMENT
v3.20.4

Revenue - Contracts and Liabilities, Narrative (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2020 | Dec. 31, 2020
Disaggregation of Revenue [Line Items] |  |
Cash payments received in advance |  | $ 100.3
Revenue recognized during the period | $ 26.9 | $ 83.9
Minimum |  |
Disaggregation of Revenue [Line Items] |  |
Contract with customer liability recognized |  | 1 year
Maximum |  |
Disaggregation of Revenue [Line Items] |  |
Contract with customer liability recognized |  | 2 years

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
- 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

X
- Definition Contract With Customer, Liability, Recognition Period + References No definition available. + Details
Name: | wst_ContractWithCustomerLiabilityRecognitionPeriod
Namespace Prefix: | wst_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Contract With Customer, Liability, Revenue Recognized During The Period + References No definition available. + Details
Name: | wst_ContractWithCustomerLiabilityRevenueRecognizedDuringThePeriod
Namespace Prefix: | wst_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |