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Share-Based Compensation - Breakdown of the Closing Balance (Details) - € / shares
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
OSA/BSPCE    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number outstanding, options (in shares) 3,881,968 3,192,708
Weighted-average exercise price, options (in Euro per share) € 27.51  
Number vested, options (in shares) 2,072,722  
Weighted-average exercise price, options (in Euro per share) € 23.75  
Weighted-average remaining contractual life of options outstanding 7 years 4 months 21 days  
RSU    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number outstanding (in shares) 5,302,299 4,212,508
BSAs    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number outstanding, options (in shares) 186,276 186,276
Weighted-average exercise price, options (in Euro per share) € 23.93  
Number vested, options (in shares) 103,272  
Weighted-average exercise price, options (in Euro per share) € 19.08  
Weighted-average remaining contractual life of options outstanding 7 years 4 months 2 days