v3.26.1
Shareholders' equity and share-based payments - Capital increase reserved for Group employees (Details) - Capital increase reserved for employees - € / shares
12 Months Ended
Jun. 10, 2025
May 23, 2025
Jun. 06, 2024
Jun. 07, 2023
Dec. 31, 2025
Sep. 24, 2025
Capital increase reserved for Group employees            
Maximum period over which the Board of Directors can increase capital reserve to members of a company or group savings plan   26 months        
Maximum capital increase reserved for employees (in shares)           18,000,000
Number of shares subscribed 10,572,824   10,251,337 7,760,062 11,100,000  
Subscription price € 42.5   € 46.9 € 45.6 € 42.5  
Free shares - Number of shares granted 576,229   581,850 242,093