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Cover Page - shares
 9 Months Ended
Sep. 30, 2024
Oct. 30, 2024
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2024  
Document Transition Report false  
Entity File Number 001-33137  
Entity Registrant Name EMERGENT BIOSOLUTIONS INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 14-1902018  
Entity Address, Address Line One 300 Professional Drive  
Entity Address, City or Town Gaithersburg,  
Entity Address, State or Province MD  
Entity Address, Postal Zip Code 20879  
City Area Code 240  
Local Phone Number 631-3200  
Title of 12(b) Security Common Stock, $0.001 par value per share  
Trading Symbol EBS  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   54,184,186
Entity Central Index Key 0001367644  
Current Fiscal Year End Date --12-31  
Amendment Flag false  
Document Fiscal Year Focus 2024  
Document Fiscal Period Focus Q3