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Document and entity information - shares
 3 Months Ended
Mar. 31, 2023
Apr. 20, 2023
Cover [Abstract]    
Document Type 10-Q  
Amendment flag false  
Document quarterly report true  
Document Period End Date Mar. 31, 2023  
Document transition report false  
Entity file number 001-38912  
Entity Registrant Name Avantor, Inc.  
Entity incorporation state or country code DE  
Entity tax identification number 82-2758923  
Entity Address, Address Line One Radnor Corporate Center, Building One, Suite 200  
Entity Address, Address Line Two 100 Matsonford Road  
Entity Address, City or Town Radnor  
Entity Address, State or Province PA  
Entity Address, Postal Zip Code 19087  
Entity central index key 0001722482  
Current fiscal year end date --12-31  
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  
Document fiscal year focus 2023  
Document fiscal period focus Q1  
Entity common stock, shares outstanding   675,107,574
Local Phone Number 386-1700  
City Area Code 610  
Title of 12(b) Security Common stock, $0.01 par value  
Trading Symbol AVTR  
Security Exchange Name NYSE