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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. 06, 2019
employee
€ / shares
shares
Jun. 01, 2018
May 03, 2018
employee
€ / shares
shares
Apr. 26, 2017
employee
€ / shares
shares
Dec. 31, 2019
shares
Sep. 18, 2019
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 9,845,111   9,174,817 9,350,220 10,050,000  
Subscription price | € / shares € 40.10   € 37.20 € 38.10    
Free shares - Number of shares granted 202,226   180,072 181,970    
Deferred contribution - Number of shares granted 5,932   6,784 10,393    
Number of beneficiaries | employee 1,187   1,360 2,086