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Capital increase (Details)
6 Months Ended
Jun. 30, 2019
EUR (€)
EquityInstruments
shares
Jun. 30, 2018
EUR (€)
Dec. 31, 2018
EUR (€)
Disclosure of classes of share capital [line items]      
Balance at beginning of period, shares | shares 54,465,421    
Balance at beginning of period € 1,214,249,000 € 1,011,983,000  
Share capital 238,475,000   € 236,540,000
Share premium 1,283,650,000   1,277,780,000
Exercise of warrants € 7,805,000 5,261,000  
Balance at end of period, shares | shares 54,823,101    
Balance at end of period € 1,143,367,000 885,659,000  
March 20, 2019 : exercise of warrants      
Disclosure of classes of share capital [line items]      
Exercise of warrants, shares | EquityInstruments 149,370    
Average exercise price warrants € 23.30    
Closing share price 90.32    
June 20, 2019 : exercise of warrants      
Disclosure of classes of share capital [line items]      
Exercise of warrants 208,310    
Average exercise price warrants 20.76    
Closing share price 113.55    
Share capital      
Disclosure of classes of share capital [line items]      
Balance at beginning of period 236,540,000 233,414,000  
Exercise of warrants 1,935,000 2,169,000  
Balance at end of period 238,475,000 235,583,000  
Share capital | March 20, 2019 : exercise of warrants      
Disclosure of classes of share capital [line items]      
Exercise of warrants 808,000    
Share capital | June 20, 2019 : exercise of warrants      
Disclosure of classes of share capital [line items]      
Exercise of warrants 1,127,000    
Share premium account      
Disclosure of classes of share capital [line items]      
Balance at beginning of period 1,277,780,000 993,025,000  
Exercise of warrants 5,870,000 3,092,000  
Balance at end of period 1,283,650,000 € 996,117,000  
Share premium account | March 20, 2019 : exercise of warrants      
Disclosure of classes of share capital [line items]      
Exercise of warrants 2,673,000    
Share premium account | June 20, 2019 : exercise of warrants      
Disclosure of classes of share capital [line items]      
Exercise of warrants 3,198,000    
Share capital and share premium      
Disclosure of classes of share capital [line items]      
Share capital and share premium     € 1,514,320,000
Balance at end of period 1,522,125,000    
Share capital and share premium | March 20, 2019 : exercise of warrants      
Disclosure of classes of share capital [line items]      
Exercise of warrants 3,481,000    
Share capital and share premium | June 20, 2019 : exercise of warrants      
Disclosure of classes of share capital [line items]      
Exercise of warrants € 4,325,000