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Shareholders' contributions - Narrative (Details) - USD ($)
12 Months Ended 99 Months Ended
Apr. 20, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2021
Mar. 11, 2022
Sep. 24, 2013
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Share capital   $ 183,573,000 $ 183,573,000   $ 183,573,000    
Treasury shares   $ 16,909,000 7,630,000   $ 16,909,000    
Par value per share (USD per share)   $ 1.5     $ 1.5    
Authorized proportion of outstanding stock (as a percent)             5.00%
Purchase of treasury shares   $ 66,463,000 4,365,000 $ 4,263,000      
Treasury stock (shares)   11,285,043     11,285,043    
Decision of the Extraordinary General Shareholders’ meeting              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Reduction of issued capital $ 16,500,000            
Cancellation of treasury shares $ 11,000,000            
Treasury shares, nominal value $ 1.50            
Share capital $ 167,072,722.5            
Number of shares issued 111,381,815            
Treasury shares $ 52,254            
Annual Dividend Proposal              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Dividend payables           $ 35,000,000  
Share Repurchase Program              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Stock repurchased under program (shares)         17,366,080    
Employee stock options exercised (shares)         6,143,349    
Purchase of treasury shares   $ 66,462,000 $ 4,365,000 $ 4,263,000