v3.19.3
Document and Entity Information
9 Months Ended
Sep. 30, 2019
shares
Document and Entity Information [Abstract]  
Document Type 10-Q
Document Quarterly Report true
Document Period End Date Sep. 30, 2019
Document Transition Report false
Entity File Number 1-8036
Entity Registrant Name WEST PHARMACEUTICAL SERVICES, INC.
Entity Incorporation, State or Country Code PA
Entity Tax Identification Number 23-1210010
Entity Address, Address Line One 530 Herman O. West Drive,
Entity Address, City or Town Exton,
Entity Address, State or Province PA
Entity Address, Postal Zip Code 19341-0645
City Area Code 610
Local Phone Number 594-2900
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Large Accelerated Filer
Entity Small Business false
Entity Emerging Growth Company false
Entity Shell Company false
Title of each class Common Stock, par value $0.25 per share
Trading Symbol WST
Security Exchange Name NYSE
Entity Central Index Key 0000105770
Current Fiscal Year End Date --12-31
Document Fiscal Year Focus 2019
Document Fiscal Period Focus Q3
Amendment Flag false
Entity Common Stock, Shares Outstanding 73,990,675