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Share-based compensation - Other Plans (Details)
$ / shares in Units, $ in Millions
9 Months Ended
Sep. 30, 2017
€ / shares
$ / shares
shares
Sep. 30, 2017
USD ($)
$ / shares
shares
Weighted average exercise price    
Outstanding at beginning of year (in euros/dollars per share) | € / shares € 5.13  
Expired (in euros/dollars per share) | € / shares 3.07  
Outstanding at end of year (in euros/dollars per share) | € / shares € 8.52  
Other plans    
Other disclosures    
Total weighted average grant date fair value of options issued during the period (in $ million) | $   $ 1.2
Other plans | Share options    
Options    
Outstanding at beginning of year (in shares)   187,500
Granted (in shares)   300,000
Expired (in shares)   (62,500)
Outstanding at end of year (in shares)   425,000
Fully vested and exercisable at end of year (in shares) 39,062 39,062
Outstanding and expected to vest at end of year (in shares) 385,938 385,938
Weighted average exercise price    
Outstanding at beginning of year (in euros/dollars per share) | $ / shares   $ 17.93
Granted (in dollars per share) | $ / shares   6.90
Expired (in euros/dollars per share) | $ / shares   27.82
Outstanding at end of year (in euros/dollars per share) | $ / shares   8.69
Fully vested and exercisable at end of year (in dollars per share) | $ / shares € 12.98 12.98
Outstanding and expected to vest at end of year (in dollars per share) | $ / shares   $ 8.25
Other plans | Restricted share units ("RSUs") | Officers    
Other disclosures    
Granted (in shares)   175,000
Total weighted average grant date fair value of RSUs granted during the period (in $ million) | $   $ 1.0