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Share-based compensation - Changes Stock Options (Details) - 12 months ended Dec. 31, 2022
€ / shares
shares
$ / shares
€ / shares
shares
$ / shares
shares
EUR-denominated Option Awards | Euro Member Countries, Euro      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Number of options, Outstanding, beginning (in shares) 57,923 57,923  
Number of options, Granted (in shares) 0 0  
Number of options, Exercised (in shares) (10,016) (10,016)  
Number of options, Forfeited (in shares) 0 0  
Number of option, Expired (in shares) (300) (300)  
Number of options, Outstanding, ending (in shares) 47,607 47,607  
Number of options, Exercisable (in shares) 47,607 47,607 47,607
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]      
Weighted average exercise price per ordinary share, Outstanding, beginning (in usd/eur per share) | € / shares € 73.87    
Weighted average exercise price per ordinary share, Granted (in usd/eur per share) | € / shares 0    
Weighted average exercise price per ordinary share, Exercised (in usd/eur per share) | € / shares 55.49    
Weighted average exercise price per ordinary share, Forfeited (in usd/eur per share) | € / shares 0    
Weighted average exercise price per ordinary share, Expired (in usd/eur per share) | € / shares 40.03    
Weighted average exercise price per ordinary share, Outstanding, ending (in usd/eur per share) | € / shares 77.95    
Weighted average exercise price per ordinary share (in usd/eur per share) | € / shares € 77.95 € 77.95  
US-denominated Option Awards | US dollar      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Number of options, Outstanding, beginning (in shares) 35,251 35,251  
Number of options, Granted (in shares) 0 0  
Number of options, Exercised (in shares) (3,113) (3,113)  
Number of options, Forfeited (in shares) 0 0  
Number of option, Expired (in shares) 0 0  
Number of options, Outstanding, ending (in shares) 32,138 32,138  
Number of options, Exercisable (in shares) 32,138 32,138 32,138
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]      
Weighted average exercise price per ordinary share, Outstanding, beginning (in usd/eur per share) | $ / shares   € 90.36  
Weighted average exercise price per ordinary share, Granted (in usd/eur per share) | $ / shares   0  
Weighted average exercise price per ordinary share, Exercised (in usd/eur per share) | $ / shares   64.73  
Weighted average exercise price per ordinary share, Forfeited (in usd/eur per share) | $ / shares   0  
Weighted average exercise price per ordinary share, Expired (in usd/eur per share) | $ / shares   0  
Weighted average exercise price per ordinary share, Outstanding, ending (in usd/eur per share) | $ / shares   € 92.84  
Weighted average exercise price per ordinary share (in usd/eur per share) | $ / shares     $ 92.84