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Equity - Avantor, Inc. following the IPO (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended 12 Months Ended
May 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Class of Stock [Line Items]        
Preferred Stock, Par or Stated Value Per Share $ 0.01      
Preferred Stock, Dividend Rate, Percentage 6.25%      
Payments of dividends   $ 32.4 $ 64.6 $ 64.6
Avantor, Inc. following the IPO | Convertible Preferred Stock        
Class of Stock [Line Items]        
Preferred Stock, Par or Stated Value Per Share   $ 0.01    
Preferred Stock, Shares Authorized   75.0    
Preferred Stock, Dividend Rate, Percentage   6.25%    
Liquidation preference per share   $ 50.00    
Accrued cumulative dividends in arrears   $ 0.0    
Payments of dividends   $ 32.4    
Avantor, Inc. following the IPO | Common stock        
Class of Stock [Line Items]        
Par value per share   $ 0.01    
Shares authorized   750.0