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Share-Based Compensation - Breakdown of the Closing Balance (Details) - € / shares
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
OSA/BSPCE    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number outstanding, options (in shares) 6,017,458 6,547,854
Weighted-average exercise price, options (in Euro per share) € 21.40  
Number exercisable, options (in shares) 2,760,417  
Weighted-average exercise price, options (in Euro per share) € 13.90  
Weighted-average remaining contractual life of options outstanding 7 years 9 months  
RSU    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number outstanding (in shares) 1,296,701 1,095,585
BSA    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number outstanding, options (in shares) 154,910 154,910
Weighted-average exercise price, options (in Euro per share) € 15.72  
Number exercisable, options (in shares) 123,558  
Weighted-average exercise price, options (in Euro per share) € 10.10  
Weighted-average remaining contractual life of options outstanding 7 years 1 month 6 days