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Equity - Avantor, Inc prior to the IPO (Details) - $ / shares
shares in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
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   7.0
Exercise price   $ 0.002
Common stock    
Class of Stock [Line Items]    
Number of shares issued 238.1  
Avantor, Inc. prior to the IPO | Series A preferred stock    
Class of Stock [Line Items]    
Par value per share   $ 0.01
Shares authorized   25.0
Avantor, Inc. prior to the IPO | Junior convertible preferred stock    
Class of Stock [Line Items]    
Par value per share   $ 0.01
Shares authorized   5.0
Avantor, Inc. prior to the IPO | Undesignated preferred stock    
Class of Stock [Line Items]    
Par value per share   $ 0.01
Shares authorized   10.0
Avantor, Inc. prior to the IPO | Common stock    
Class of Stock [Line Items]    
Par value per share   $ 0.002
Shares authorized   2,675.0
Avantor, Inc. prior to the IPO | Class B stock    
Class of Stock [Line Items]    
Par value per share   $ 0.01
Shares authorized   0.3