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Share-Based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 6 Months Ended
Jun. 30, 2021
Number of Shares  
Options outstanding (in shares) 14,032
Options, granted (in shares) 2,453
Options, exercised (in shares) (945)
Options, forfeited (in shares) (524)
Options, expired (in shares) (54)
Options outstanding (in shares) 14,962
Options, vested and unvested expected to vest (in shares) 13,586
Options, exercisable (in shares) 9,074
Weighted Average Exercise  Price  
Options outstanding (in dollars per share) $ 9.54
Options, granted (in dollars per share) 18.54
Options, exercised (in dollars per share) 7.29
Options, forfeited (in dollars per share) 13.04
Options, expired (in dollars per share) 13.21
Options outstanding (in dollars per share) 11.02
Options, vested and unvested expected to vest (in dollars per share) 10.80
Options, exercisable (in dollars per share) $ 9.34
Additional Disclosures  
Weighted average remaining contractual life, options outstanding 6 years 7 months 6 days
Weighted average remaining contractual life, options vested and unvested expected to vest 6 years 4 months 24 days
Weighted average remaining contractual life, options exercisable 5 years 3 months 18 days
Aggregate intrinsic value, options outstanding $ 15.1
Aggregate intrinsic value, vested and unvested expected to vest 15.0
Aggregate intrinsic value, exercisable $ 14.8