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Shareholders' equity and share-based payments - Capital increase reserved for Group employees (Details) - Capital increase reserved for employees
12 Months Ended
Jun. 08, 2022
€ / shares
shares
May 25, 2022
Jun. 09, 2021
€ / shares
shares
Jun. 11, 2020
EquityInstruments
employee
€ / shares
shares
Dec. 31, 2022
€ / shares
shares
Sep. 22, 2022
shares
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 9,130,380   10,376,190 12,952,925 9,360,000  
Subscription price | € / shares € 37.00   € 30.50 € 26.20 € 37.00  
Free shares - Number of shares granted 227,631   213,523 207,458    
Shares granted | EquityInstruments       1,380    
Number of beneficiaries | employee       276