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Shareholders' equity and share-based payments - Dividend (Details)
Jan. 11, 2018
dividend
€ / shares
shares
Oct. 26, 2017
€ / shares
Oct. 12, 2017
€ / shares
shares
Dec. 31, 2017
€ / shares
Dividend        
Number of quarterly interim dividends paid for the current fiscal year | dividend 2      
Dividend (in Euros per share) € 0.62   € 0.62  
Share price for dividend paid in shares (in Euros per share) € 46.55   € 41.12  
Discount rate on share price for dividend paid in shares, as a percentage of average Euronext Paris opening price     5.00%  
Number of trading days to determine stock dividend price 20 days   20 days  
Number of shares issued in lieu of cash dividend | shares 7,087,904   25,633,559  
Dividend decided by Board of Directors (in Euros per share)   € 0.62    
Dividend for the 2017 fiscal year, to be submitted at shareholders' meeting (in Euros per share)       € 2.48
Balance of fiscal year dividend to be distributed after deducting quarterly interim dividends (in Euros per share)       € 0.62