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Share based Compensation - Stock Option Activity (Details)
$ / shares in Units, shares in Thousands, $ in Millions
6 Months Ended
Jun. 30, 2018
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Options, Expired (in shares) | shares (7)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]  
Options, Expired (in dollars per share) | $ / shares $ 10.45
Options to purchase common stock  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Options outstanding, December 31, 2017 (in shares) | shares 15,181
Options, Granted (in shares) | shares 1,910
Options, Exercised (in shares) | shares (1,102)
Forfeited, Options (in shares) | shares (113)
Options outstanding, June 30, 2018 (in shares) | shares 15,869
Options, Vested and unvested expected to vest, June 30, 2018 (in shares) | shares 15,160
Options, Exercisable at June 30, 2018 (in shares) | shares 8,916
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]  
Option outstanding, December 31, 2017 (in dollars per share) | $ / shares $ 7.48
Options, Granted (in dollars per share) | $ / shares 15.49
Options, Exercised (in dollars per share) | $ / shares 6.87
Options, Forfeited (in dollars per share) | $ / shares 9.75
Option outstanding, June 30, 2018 (in dollars per share) | $ / shares 8.47
Options, Vested and unvested expected to vest, June 30, 2018 (in dollars per share) | $ / shares 8.32
Options, Exercisable at June 30, 2018 (in shares) | $ / shares $ 7.08
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]  
Weighted average remaining contractual life, options outstanding, June 30, 2018 7 years 2 months 12 days
Weighted average remaining contractual life, options vested and unvested expected to vest, June 30, 2018 7 years 1 month 6 days
Weighted average remaining contractual life, options exercisable at June 30, 2018 6 years 1 month 6 days
Aggregate intrinsic value, options outstanding, June 30, 2018 | $ $ 114.0
Aggregate intrinsic value, vested and unvested expected to vest, June 30, 2018 | $ 109.6
Aggregate intrinsic value, exercisable at June 30, 2018 | $ $ 76.4