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Share-Based Compensation - Breakdown of the Closing Balance of BSPCE / OSA / RSU (Details) - € / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number outstanding (in shares) 7,967,602 7,405,216 8,203,371 7,643,439
Weighted-average exercise price (in Euro per share) € 26.94 € 28.33 € 23.92  
Weighted-average exercise price (in shares) 2,241,036 1,971,130 2,708,406  
Weighted-average exercise price (in Euro per share) € 25.39 € 23.16 € 17.73  
Weighted-average remaining contractual life 6 years 8 months 6 days 6 years 10 months 24 days 6 years 10 months 24 days  
OSAs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number outstanding (in shares) 3,187,465 3,192,708 4,960,092 6,547,854
RSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number outstanding (in shares) 4,780,137 4,212,508 3,243,279 1,095,585
Weighted-average exercise price (in Euro per share) € 0.00 € 0.00 € 0.00  
Weighted-average exercise price (in Euro per share) € 0.00 € 0.00 € 0.00  
Plans 1 and 2 | OSAs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number outstanding (in shares) 3,600 15,020 54,154  
Weighted-average exercise price (in Euro per share) € 0.70 € 0.87 € 1.24  
Weighted-average exercise price (in shares) 3,600 15,020 54,154  
Weighted-average exercise price (in Euro per share) € 0.70 € 0.87 € 1.24  
Weighted-average remaining contractual life 1 year 2 months 24 days 1 year 6 months 24 days 2 years 10 months 24 days  
Plan 3 | OSAs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number outstanding (in shares) 67,751 89,921 175,693  
Weighted-average exercise price (in Euro per share) € 4.43 € 4.03 € 3.29  
Weighted-average exercise price (in shares) 67,751 89,921 175,693  
Weighted-average exercise price (in Euro per share) € 4.43 € 4.03 € 3.29  
Weighted-average remaining contractual life 2 years 4 months 18 days 3 years 4 months 18 days 4 years 3 months 18 days  
Plan 5 | OSAs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number outstanding (in shares) 242,613 251,306 513,067  
Weighted-average exercise price (in Euro per share) € 5.95 € 5.95 € 5.95  
Weighted-average exercise price (in shares) 242,613 251,306 513,067  
Weighted-average exercise price (in Euro per share) € 5.95 € 5.95 € 5.95  
Weighted-average remaining contractual life 3 years 3 months 12 days 4 years 3 months 12 days 5 years 2 months 12 days  
Plan 6 | OSAs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number outstanding (in shares) 41,338 70,803 399,441  
Weighted-average exercise price (in Euro per share) € 9.26 € 9.65 € 9.77  
Weighted-average exercise price (in shares) 41,338 70,803 325,596  
Weighted-average exercise price (in Euro per share) € 9.26 € 9.65 € 9.66  
Weighted-average remaining contractual life 4 years 6 days 5 years 1 month 6 days 6 years 1 month 6 days  
Plan 7 | OSAs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number outstanding (in shares) 306,172 372,590 750,528  
Weighted-average exercise price (in Euro per share) € 17.95 € 17.70 € 18.13  
Weighted-average exercise price (in shares) 306,172 359,702 504,262  
Weighted-average exercise price (in Euro per share) € 17.95 € 17.31 € 17.94  
Weighted-average remaining contractual life 4 years 10 months 30 days 5 years 9 months 18 days 6 years 9 months 18 days  
Plan 8 | OSAs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number outstanding (in shares) 1,599,033 1,929,403 2,942,834  
Weighted-average exercise price (in Euro per share) € 30.99 € 32.07 € 31.32  
Weighted-average exercise price (in shares) 1,417,904 1,145,511 1,135,634  
Weighted-average exercise price (in Euro per share) € 30.04 € 30.88 € 28.96  
Weighted-average remaining contractual life 6 years 2 months 12 days 7 years 2 months 12 days 8 years 2 months 12 days  
Plan 9 | OSAs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number outstanding (in shares) 328,726 463,665 124,375  
Weighted-average exercise price (in Euro per share) € 41.75 € 42.04 € 38.20  
Weighted-average exercise price (in shares) 161,658 38,867    
Weighted-average exercise price (in Euro per share) € 41.37 € 38.20 € 0.00  
Weighted-average remaining contractual life 8 years 2 months 6 days 9 years 2 months 6 days 9 years 6 months 30 days  
Plan 10 | OSAs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number outstanding (in shares) 532,732      
Weighted-average exercise price (in Euro per share) € 25.79 € 0.00 € 0.00  
Weighted-average exercise price (in Euro per share) € 0.00 0.00 0.00  
Weighted-average remaining contractual life 9 years 3 months 30 days      
Plan 11 | OSAs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number outstanding (in shares) 65,500      
Weighted-average exercise price (in Euro per share) € 18.72 0.00 0.00  
Weighted-average exercise price (in Euro per share) € 0.00 € 0.00 € 0.00  
Weighted-average remaining contractual life 9 years 9 months 30 days