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Share-based compensation - Changes Conditional Shares (Details)
12 Months Ended
Dec. 31, 2025
€ / shares
shares
Dec. 31, 2025
$ / shares
shares
EUR-denominated    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Conditional shares outstanding, beginning (in shares) 280,353 280,353
Granted (in shares) 261,198 261,198
Vested (in shares) (203,871) (203,871)
Forfeited (in shares) (6,314) (6,314)
Conditional shares outstanding, ending (in shares) 331,366 331,366
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Conditional shares outstanding, beginning (in usd/eur per share) | € / shares € 680.02  
Granted (in usd/eur per share) | € / shares 636.49  
Vested (in usd/eur per share) | € / shares 650.87  
Forfeited (in usd/eur per share) | € / shares 632.69  
Conditional shares outstanding, ending (in usd/eur per share) | € / shares € 664.54  
USD-denominated    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Conditional shares outstanding, beginning (in shares) 410,680 410,680
Granted (in shares) 279,674 279,674
Vested (in shares) (229,822) (229,822)
Forfeited (in shares) (13,191) (13,191)
Conditional shares outstanding, ending (in shares) 447,341 447,341
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Conditional shares outstanding, beginning (in usd/eur per share) | $ / shares   $ 734.50
Granted (in usd/eur per share) | $ / shares   660.67
Vested (in usd/eur per share) | $ / shares   711.06
Forfeited (in usd/eur per share) | $ / shares   714.28
Conditional shares outstanding, ending (in usd/eur per share) | $ / shares   $ 700.98