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Document and Entity Information
9 Months Ended
Sep. 30, 2017
shares
Document and Entity Information [Abstract]  
Entity Registrant Name WEST PHARMACEUTICAL SERVICES INC
Entity Central Index Key 0000105770
Current Fiscal Year End Date --12-31
Entity Well-known Seasoned Issuer Yes
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Filer Category Large Accelerated Filer
Entity Common Stock, Shares Outstanding 74,252,923
Document Fiscal Year Focus 2017
Document Fiscal Period Focus Q3
Document Type 10-Q
Document Period End Date Sep. 30, 2017
Amendment Flag false