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Share-Based Compensation - Narrative (Details) - shares
9 Months Ended
Jul. 25, 2019
Jun. 25, 2019
Apr. 25, 2019
Mar. 01, 2019
Sep. 30, 2019
RSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
RSUs granted (in shares) 1,624,035 195,420   202,180 2,864,133
Share options / BSPCE          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
RSUs granted (in shares)   62,880      
Tranche 1 | RSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting schedule of grant (as a percent)         70.00%
Tranche 1 | Management | RSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
RSUs granted (in shares)     257,291    
Tranche 2 | RSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting schedule of grant (as a percent)         15.00%
Tranche 2 | Management | RSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
RSUs granted (in shares)     257,291    
Tranche 3 | Management | RSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
RSUs granted (in shares)     327,916