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Equity - Avantor, Inc prior to the IPO (Details) - $ / shares
12 Months Ended
Sep. 15, 2021
Dec. 31, 2020
Dec. 31, 2019
Class of Stock [Line Items]      
Number of shares issued 23,810,000    
Series A preferred stock      
Class of Stock [Line Items]      
Dividend rate   12.50%  
Series A preferred stock | Warrants      
Class of Stock [Line Items]      
Number of shares issued     7,000,000
Exercise price     $ 0.002
Common stock      
Class of Stock [Line Items]      
Number of shares issued   238,100,000  
Avantor, Inc. prior to the IPO | Series A preferred stock      
Class of Stock [Line Items]      
Par value per share     $ 0.01
Shares authorized     25,000,000.0
Avantor, Inc. prior to the IPO | Junior convertible preferred stock      
Class of Stock [Line Items]      
Par value per share     $ 0.01
Shares authorized     5,000,000.0
Avantor, Inc. prior to the IPO | Undesignated preferred stock      
Class of Stock [Line Items]      
Par value per share     $ 0.01
Shares authorized     10,000,000.0
Avantor, Inc. prior to the IPO | Common stock      
Class of Stock [Line Items]      
Par value per share     $ 0.002
Shares authorized     2,675,000,000
Avantor, Inc. prior to the IPO | Class B stock      
Class of Stock [Line Items]      
Par value per share     $ 0.01
Shares authorized     300,000