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Share-Based Compensation - Stock Option Activity (Details) - 3 months ended Mar. 31, 2022
shares in Thousands, $ in Millions
$ / shares
shares
USD ($)
shares
Number of Shares    
Options outstanding (in shares) | shares 14,731  
Options, granted (in shares) | shares 4,892  
Options, exercised (in shares) | shares (149)  
Options, forfeited (in shares) | shares (127)  
Options, expired (in shares) | shares (43)  
Options outstanding (in shares) | shares 19,304  
Options, vested and unvested expected to vest (in shares) | shares   17,174
Options, exercisable (in shares) | shares   9,932
Weighted Average Exercise  Price    
Options outstanding (in dollars per share) | $ / shares $ 11.08  
Options, granted (in dollars per share) | $ / shares 11.89  
Options, exercised (in dollars per share) | $ / shares 6.00  
Options, forfeited (in dollars per share) | $ / shares 12.57  
Options, expired (in dollars per share) | $ / shares 11.74  
Options outstanding (in dollars per share) | $ / shares 11.31  
Options, vested and unvested expected to vest (in dollars per share) | $ / shares 11.16  
Options, exercisable (in dollars per share) | $ / shares $ 10.20  
Additional Disclosures    
Weighted average remaining contractual life, options outstanding 7 years 1 month 6 days  
Weighted average remaining contractual life, options vested and unvested expected to vest 6 years 9 months 18 days  
Weighted average remaining contractual life, options exercisable 5 years 1 month 6 days  
Aggregate intrinsic value, options outstanding | $   $ 12.3
Aggregate intrinsic value, vested and unvested expected to vest | $   12.2
Aggregate intrinsic value, exercisable | $   $ 12.0