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Affiliated Companies (Details) | Dec. 31, 2014
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The West Company Mexico, S.A. de C.V. [Member] |
Schedule of Equity Method Investments [Line Items] |
Ownership interest | 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = wst_WestCompanyMexicoSADeCVMember
Aluplast S.A. de C.V. [Member] |
Schedule of Equity Method Investments [Line Items] |
Ownership interest | 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = wst_AluplastSADeCVMember
Pharma Tap S.A de C.V. [Member] |
Schedule of Equity Method Investments [Line Items] |
Ownership interest | 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = wst_PharmaTapSADeCVMember
Pharma Rubber S.A. de C.V. [Member] |
Schedule of Equity Method Investments [Line Items] |
Ownership interest | 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = wst_PharmaRubberSADeCVMember
Daikyo Seiko, Ltd. [Member] |
Schedule of Equity Method Investments [Line Items] |
Ownership interest | 25.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = wst_DaikyoSeikoLtdDaikyoMember

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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