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Share-Based Compensation - Change in Number of outstanding BSPCE / OSA / RSU (Details) - shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]      
Beginning Balance (in shares) 7,405,216 8,203,371 7,643,439
Granted (in shares) 4,146,709 2,246,712 3,160,683
Exercised (in shares) (137,348) (1,668,838) (1,470,323)
Vested (RSU's) (in shares) (1,362,873) (379,135)  
Forfeited (in shares) (2,084,102) (996,894) (1,130,428)
Expired (in shares) 0 0 0
Ending Balance (in shares) 7,967,602 7,405,216 8,203,371
OSAs      
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]      
Beginning Balance (in shares) 3,192,708 4,960,092 6,547,854
Granted (in shares) 1,013,065 355,010 576,443
Exercised (in shares) (137,348) (1,668,838) (1,470,323)
Vested (RSU's) (in shares) 0 0  
Forfeited (in shares) (880,960) (453,556) (693,882)
Expired (in shares) 0 0 0
Ending Balance (in shares) 3,187,465 3,192,708 4,960,092
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]      
Beginning Balance (in shares) 4,212,508 3,243,279 1,095,585
Granted (in shares) 3,133,644 1,891,702 2,584,240
Exercised (in shares) 0 0 0
Vested (RSU's) (in shares) (1,362,873) (379,135)  
Forfeited (in shares) (1,203,142) (543,338) (436,546)
Expired (in shares) 0 0 0
Ending Balance (in shares) 4,780,137 4,212,508 3,243,279