v3.19.3
Document and Entity Information Document and Entity Information
Nov. 19, 2019
Document and Entity Information [Abstract]  
Entity Central Index Key 0000105770
Document Type 8-K
Document Period End Date Nov. 19, 2019
Entity Registrant Name WEST PHARMACEUTICAL SERVICES, INC.
Entity Incorporation, State or Country Code PA
Entity File Number 1-8036
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
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, par value $0.25 per share
Trading Symbol WST
Security Exchange Name NYSE
Entity Emerging Growth Company false
Amendment Flag false