Stock-Based Compensation - Range of Exercise Prices and Intrinsic Value Related to Options Outstanding (Details)	12 Months Ended
	Dec. 31, 2020 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range
Options Outstanding, Number Outstanding (in shares) | shares	5,752,932
Options Outstanding, Weighted Average Remaining Contractual Life	5 years 10 months 24 days
Options Outstanding, Weighted Average Exercise Price Per Share (in dollars per share)	$ 44.40
Options Exercisable, Number Exercisable (in shares) | shares	3,784,647
Options Exercisable, Weighted Average Remaining Contractual Life	4 years 2 months 12 days
Options Exercisable, Weighted Average Exercise Price Per Share (In dollars per share)	$ 58.80
$8.81 - $29.50
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range
Range of Exercise Prices, low end of range (in dollars per share)	8.81
Range of Exercise Prices, high end of range (in dollars per share)	$ 29.50
Options Outstanding, Number Outstanding (in shares) | shares	2,088,027
Options Outstanding, Weighted Average Remaining Contractual Life	9 years 2 months 12 days
Options Outstanding, Weighted Average Exercise Price Per Share (in dollars per share)	$ 17.27
Options Exercisable, Number Exercisable (in shares) | shares	130,947
Options Exercisable, Weighted Average Remaining Contractual Life	8 years 4 months 24 days
Options Exercisable, Weighted Average Exercise Price Per Share (In dollars per share)	$ 29.03
$46.07 - $62.50
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range
Range of Exercise Prices, low end of range (in dollars per share)	46.07
Range of Exercise Prices, high end of range (in dollars per share)	$ 62.50
Options Outstanding, Number Outstanding (in shares) | shares	3,054,457
Options Outstanding, Weighted Average Remaining Contractual Life	4 years 4 months 24 days
Options Outstanding, Weighted Average Exercise Price Per Share (in dollars per share)	$ 56.48
Options Exercisable, Number Exercisable (in shares) | shares	3,043,252
Options Exercisable, Weighted Average Remaining Contractual Life	4 years 4 months 24 days
Options Exercisable, Weighted Average Exercise Price Per Share (In dollars per share)	$ 56.47
$70.76 - $79.19
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range
Range of Exercise Prices, low end of range (in dollars per share)	70.76
Range of Exercise Prices, high end of range (in dollars per share)	$ 79.19
Options Outstanding, Number Outstanding (in shares) | shares	610,448
Options Outstanding, Weighted Average Remaining Contractual Life	2 years 3 months 18 days
Options Outstanding, Weighted Average Exercise Price Per Share (in dollars per share)	$ 76.77
Options Exercisable, Number Exercisable (in shares) | shares	610,448
Options Exercisable, Weighted Average Remaining Contractual Life	2 years 3 months 18 days
Options Exercisable, Weighted Average Exercise Price Per Share (In dollars per share)	$ 76.77