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v2.4.1.9

Segment Information (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Reportable segments | 2 us-gaap_NumberOfReportableSegments |
Net sales | $ 335.9 us-gaap_SalesRevenueNet | $ 346.8 us-gaap_SalesRevenueNet
Operating profit | 47.8 us-gaap_OperatingIncomeLoss | 39.3 us-gaap_OperatingIncomeLoss
Interest expense | 4.1 us-gaap_InterestExpense | 4.0 us-gaap_InterestExpense
Interest income | 0.4 us-gaap_InvestmentIncomeNet | 0.4 us-gaap_InvestmentIncomeNet
Income before income taxes | 44.1 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 35.7 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Packaging Systems [Member] |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Net sales | 242.5 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = wst_PackagingSystemsMember | 252.9 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = wst_PackagingSystemsMember
Operating profit | 60.9 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = wst_PackagingSystemsMember | 51.4 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = wst_PackagingSystemsMember
Delivery Systems [Member] |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Net sales | 93.5 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = wst_DeliverySystemsMember | 94.0 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = wst_DeliverySystemsMember
Operating profit | (0.5)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = wst_DeliverySystemsMember | (0.2)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = wst_DeliverySystemsMember
Intersegment Sales [Member] |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Net sales | (0.1)us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = wst_IntersegmentSalesEliminationMember | (0.1)us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = wst_IntersegmentSalesEliminationMember
Corporate [Member] |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Operating profit | $ (12.6)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = wst_CorporateAndEliminationsMember | $ (11.9)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = wst_CorporateAndEliminationsMember

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- Definition Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 9 -Article 9 + Details
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