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v2.4.1.9

Goodwill and Intangible Assets (Goodwill) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
Goodwill [Roll Forward] |  |
Balance, beginning | $ 114.2 us-gaap_Goodwill | $ 112.5 us-gaap_Goodwill
Disposition | (0.5)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit |
Foreign currency translation | (5.1)us-gaap_GoodwillTranslationAdjustments | 1.7 us-gaap_GoodwillTranslationAdjustments
Balance, ending | 108.6 us-gaap_Goodwill | 114.2 us-gaap_Goodwill
Packaging Systems [Member] |  |
Goodwill [Roll Forward] |  |
Balance, beginning | 38.0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = wst_PackagingSystemsMember | 36.7 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = wst_PackagingSystemsMember
Disposition | 0 us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit / us-gaap_StatementBusinessSegmentsAxis = wst_PackagingSystemsMember |
Foreign currency translation | (3.9)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = wst_PackagingSystemsMember | 1.3 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = wst_PackagingSystemsMember
Balance, ending | 34.1 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = wst_PackagingSystemsMember | 38.0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = wst_PackagingSystemsMember
Delivery Systems [Member] |  |
Goodwill [Roll Forward] |  |
Balance, beginning | 76.2 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = wst_DeliverySystemsMember | 75.8 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = wst_DeliverySystemsMember
Disposition | (0.5)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit / us-gaap_StatementBusinessSegmentsAxis = wst_DeliverySystemsMember |
Foreign currency translation | (1.2)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = wst_DeliverySystemsMember | 0.4 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = wst_DeliverySystemsMember
Balance, ending | $ 74.5 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = wst_DeliverySystemsMember | $ 76.2 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = wst_DeliverySystemsMember

X
- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
Name: | us-gaap_Goodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_GoodwillRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=wst_DeliverySystemsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=wst_PackagingSystemsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |