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Other Expense (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Other Income and Expenses [Abstract] |  |
Development income | $ (0.4) | $ (0.3)
Acquisition-related contingencies | 0.4 | 0
Foreign exchange and other | 0.7 | 0.5
Other expense | $ 0.7 | $ 0.2

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- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e7008-128479 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Balance Type: | na
Period Type: | duration

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- Definition The net amount of other operating income and expenses, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operations. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | duration

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- Definition The amount of consideration recognized during the period under a development, licensing and supply agreement entered into with a customer. + References No definition available. + Details
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Namespace Prefix: | wst_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The total amount of other income and expense items that are associated with the entity's normal revenue producing operation. + References No definition available. + Details
Name: | wst_OtherIncomeExpense
Namespace Prefix: | wst_
Data Type: | xbrli:monetaryItemType
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