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Shareholders' equity - Dividend (Details)
Jul. 25, 2018
€ / shares
Jun. 28, 2018
€ / shares
shares
Jun. 01, 2018
dividend
€ / shares
Apr. 25, 2018
€ / shares
Apr. 09, 2018
€ / shares
Jan. 11, 2018
€ / shares
Oct. 12, 2017
€ / shares
Dividend              
Dividend approved for the 2017 fiscal year (in Euros per share)     € 2.48        
Number of quarterly interim dividends already paid for fiscal year 2017 | dividend     3        
Dividend paid (in Euros per share)   € 0.62     € 0.62 € 0.62 € 0.62
Number of trading days to determine stock dividend price     20 days        
Share price for dividend paid in shares (in Euros per share)   € 52.03          
Number of shares issued in lieu of cash dividend | shares   5,798,335          
Dividend decided by Board of Directors (in Euros per share) € 0.64     € 0.64