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Equity - Avantor, Inc. following the IPO (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Class of Stock [Line Items]      
Payments of dividends $ 31.3 $ 0.0 $ 0.0
Avantor, Inc. following the IPO | Undesignated preferred stock      
Class of Stock [Line Items]      
Par value per share $ 0.01    
Shares authorized 50,000,000    
Avantor, Inc. following the IPO | Mandatory convertible preferred stock      
Class of Stock [Line Items]      
Par value per share $ 0.01    
Shares authorized 25,000,000    
Dividend rate 6.25%    
Liquidation preference per share $ 50    
Accrued cumulative dividends in arrears $ 8.0    
Payments of dividends $ 31.3    
Avantor, Inc. following the IPO | Mandatory convertible preferred stock | Minimum      
Class of Stock [Line Items]      
Shares of common stock issued upon conversion per share 3.0395    
Avantor, Inc. following the IPO | Mandatory convertible preferred stock | Maximum      
Class of Stock [Line Items]      
Shares of common stock issued upon conversion per share 3.5714    
Avantor, Inc. following the IPO | Common stock      
Class of Stock [Line Items]      
Par value per share $ 0.01    
Shares authorized 750,000,000