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Stockholders' Equity and Stock-Based Compensation - Stock Option Activity Under Equity Plan (Details) - Employee Stock Option - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Equity [Line Items]    
Weighted Average Remaining Contractual Life in Years, stock options outstanding 4 years 1 month 6 days 4 years 4 months 24 days
Weighted Average Remaining Contractual Life in Years, exercisable stock options 2 years 3 months 18 days  
Weighted Average Remaining Contractual Life in Years, stock options vested and expected to vest 4 years 1 month 6 days  
Number of Options    
Outstanding at beginning of period (in shares) 2,259,475  
Granted (in shares) 472,440  
Exercised (in shares) (416,708)  
Forfeited/Expired (in shares) (155,395)  
Outstanding at end of period (in shares) 2,159,812 2,259,475
Exercisable at end of period (in shares) 678,948  
Vested and expected to vest (in shares) 2,043,281  
Weighted Average Exercise Price    
Outstanding at beginning of period (in dollars per share) $ 105.34  
Granted (in dollars per share) 153.35  
Exercised (in dollars per share) 72.24  
Forfeited/Expired (in dollars per share) 136.65  
Outstanding at end of period (in dollars per share) 119.97 $ 105.34
Exercisable at end of period (in dollars per share) 82.34  
Vested and expected to vest at end of period (in dollars per share) $ 118.56  
Aggregate Intrinsic Value (In  millions)    
Outstanding at end of period $ 38.9  
Exercisable at end of period 30.2  
Vested and expected to vest at end of period $ 38.6