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Share-based payment - Legacy programs - Stock Options (Details) - Stock Option
12 Months Ended
Dec. 31, 2017
EUR (€)
Options
plan
shares
Dec. 31, 2016
EUR (€)
Options
Dec. 31, 2015
EUR (€)
Options
Dec. 31, 2014
EUR (€)
Options
Share-based payment        
Number of global plans | plan 1      
Number of shares per option | shares 1      
Balanced at beginning of period (in shares) | Options 1,601,021 3,640,286 7,344,023  
Shares exercised | Options (415,750) (832,900) (1,242,381)  
Shares forfeited | Options (215,000) (17,875) (2,215,216)  
Shares expired | Options (522,771) (1,188,490) (246,140)  
Balance at end of period (in shares) | Options 447,500 1,601,021 3,640,286  
Weighted average exercise price at beginning of period € 3.34 € 4.67 € 4.81  
Weighted average exercise price - exercised 2.13 2.52 3.79  
Weighted average exercise price - forfeited 2.71 2.57 2.48  
Weighted average exercise price - expired 5.65 7.81 8.07  
Weighted average exercise price at end of period 2.07 3.34 4.67  
Weighted average share price € 4.93 € 4.87 € 6.44  
Number of options exercisable | Options 447,500 1,197,771 2,318,911 1,913,537
Weighted average exercise price of exercisable options € 2.07 € 3.56 € 5.97 € 10.43