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Share-based compensation - Summary of Share Plans (Details)
€ / shares in Units, $ / shares in Units, € in Millions, $ in Millions
12 Months Ended
Dec. 31, 2024
EUR (€)
€ / shares
Dec. 31, 2024
USD ($)
$ / shares
Dec. 31, 2023
EUR (€)
€ / shares
Dec. 31, 2023
USD ($)
$ / shares
Dec. 31, 2022
EUR (€)
€ / shares
Dec. 31, 2022
USD ($)
$ / shares
EUR-denominated            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total fair value of shares vested during the year (in millions) | € € 161.4   € 175.5   € 120.6  
Weighted average fair value of shares granted (in usd/eur per share) | € / shares € 801.78   € 587.42   € 578.65  
USD-denominated            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total fair value of shares vested during the year (in millions) | $   $ 155.2   $ 127.0   $ 149.6
Weighted average fair value of shares granted (in usd/eur per share) | $ / shares   $ 848.18   $ 624.10   $ 553.61