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Segment Information (Sales by Product Group) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting, Revenue Reconciling Items [Line Items] |  |  |
Net sales | $ 1,421.4 us-gaap_SalesRevenueNet | $ 1,368.4 us-gaap_SalesRevenueNet | $ 1,266.4 us-gaap_SalesRevenueNet
Packaging Systems [Member] |  |  |
Segment Reporting, Revenue Reconciling Items [Line Items] |  |  |
Net sales | 1,019.7 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = wst_PackagingSystemsMember | 996.0 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = wst_PackagingSystemsMember | 915.1 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = wst_PackagingSystemsMember
Delivery Systems [Member] |  |  |
Segment Reporting, Revenue Reconciling Items [Line Items] |  |  |
Net sales | 402.5 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = wst_DeliverySystemsMember | 374.1 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = wst_DeliverySystemsMember | 352.1 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = wst_DeliverySystemsMember
Intersegment Elimination [Member] |  |  |
Segment Reporting, Revenue Reconciling Items [Line Items] |  |  |
Net sales | (0.8)us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | (1.7)us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | (0.8)us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember
Proprietary Products [Member] | Delivery Systems [Member] |  |  |
Segment Reporting, Revenue Reconciling Items [Line Items] |  |  |
Net sales | 105.4 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = wst_ProprietaryProductsMember / us-gaap_StatementBusinessSegmentsAxis = wst_DeliverySystemsMember | 92.7 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = wst_ProprietaryProductsMember / us-gaap_StatementBusinessSegmentsAxis = wst_DeliverySystemsMember | 77.0 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = wst_ProprietaryProductsMember / us-gaap_StatementBusinessSegmentsAxis = wst_DeliverySystemsMember
Contract Manufacturing [Member] | Delivery Systems [Member] |  |  |
Segment Reporting, Revenue Reconciling Items [Line Items] |  |  |
Net sales | $ 297.1 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = wst_ContractManufacturingAndConsumerMember / us-gaap_StatementBusinessSegmentsAxis = wst_DeliverySystemsMember | $ 281.4 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = wst_ContractManufacturingAndConsumerMember / us-gaap_StatementBusinessSegmentsAxis = wst_DeliverySystemsMember | $ 275.1 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = wst_ContractManufacturingAndConsumerMember / us-gaap_StatementBusinessSegmentsAxis = wst_DeliverySystemsMember

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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