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Cover - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2023
Jan. 25, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
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 19341-1147    
City Area Code 610    
Local Phone Number 594-2900    
Title of 12(b) Security Common Stock, par value $.25 per share    
Trading Symbol WST    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
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    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Document Financial Statement Error Correction [Flag] false    
Entity Public Float     $ 28.2
Entity Common Stock, Shares Outstanding   73,299,296  
Documents Incorporated by Reference
DocumentParts Into Which Incorporated
Proxy Statement for the 2024 Annual Meeting of Shareholders to be filed not later than 120 days after the end of the fiscal year covered by this Form 10-K.Part III
    
Entity Central Index Key 0000105770    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false