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Share-based compensation - Stock Options (Details)
€ / shares in Units, $ / shares in Units, € in Millions, $ in Millions
12 Months Ended
Dec. 31, 2025
EUR (€)
€ / shares
Dec. 31, 2025
USD ($)
$ / shares
Dec. 31, 2024
EUR (€)
€ / shares
Dec. 31, 2024
USD ($)
$ / shares
Dec. 31, 2023
EUR (€)
€ / shares
Dec. 31, 2023
USD ($)
$ / shares
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
EUR-denominated                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Weighted average share price at stock option exercise (in usd/eur per share) | € / shares € 722.84   € 834.48   € 613.03        
Aggregate intrinsic value of exercised stock options (in millions) | € € 8.8   € 10.2   € 8.1        
Weighted average remaining contractual term of exercisable options (in years) 3 months 25 days 3 months 25 days 9 months 29 days 9 months 29 days 1 year 5 months 23 days 1 year 5 months 23 days      
Aggregate intrinsic value of exercisable stock options (in millions) | € € 4.6   € 11.4   € 19.7        
Aggregate intrinsic value of outstanding stock options (in millions) | € € 4.6   € 11.4   € 19.7        
USD-denominated                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Weighted average share price at stock option exercise (in usd/eur per share) | $ / shares   $ 840.14   $ 911.23   $ 678.41      
Aggregate intrinsic value of exercised stock options (in millions) | $   $ 6.8   $ 8.2   $ 4.8      
Weighted average remaining contractual term of exercisable options (in years) 3 months 18 days 3 months 18 days 10 months 2 days 10 months 2 days 1 year 5 months 4 days 1 year 5 months 4 days      
Aggregate intrinsic value of exercisable stock options (in millions) | $             $ 4.5 $ 8.2 $ 15.9
Aggregate intrinsic value of outstanding stock options (in millions) | $             $ 4.5 $ 8.2 $ 15.9