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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
The following table summarizes the activity and related information for RSUs for the periods presented below (in millions, except per share amounts):
 Restricted Stock Units Outstanding
 Number of SharesWeighted-Average Grant Date Fair Value per Share
Balance—December 31, 20187.8 $46.07 
Granted2.7 87.09 
Forfeited(0.7)55.13 
Vested(3.7)43.31 
Balance—December 31, 20196.1 64.56 
Granted1.9 121.16 
Forfeited(0.4)79.83 
Vested(2.9)58.20 
Balance—December 31, 20204.7 90.46 
Granted1.2 202.63 
Forfeited(0.4)114.96 
Vested(2.3)81.52 
Balance—December 31, 20213.2 $136.08 
Schedule of Share-based Compensation, Shares Withheld for Taxes
The following summarizes the number and value of the shares withheld for employee taxes (in millions):
Year Ended December 31,
202120202019
Shares withheld for taxes0.8 0.9 1.1 
Amount withheld for taxes$167.9 $108.2 $96.0 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The following table summarizes the weighted-average assumptions relating to our employee stock options:
 Year Ended December 31,
 202120202019
Expected term in years4.44.44.4
Volatility39.1 %34.8 %34.3 %
Risk-free interest rate0.5 %1.1 %2.4 %
Dividend rate— %— %— %
Schedule of Share-based Compensation, Stock Options, Activity
The following table summarizes the stock option activity and related information for the periods presented below (in millions, except exercise prices and contractual life):
 Options Outstanding
 Number
of Shares		Weighted-
Average
Exercise
Price 		Weighted-
Average
Remaining
Contractual
Life (Years)		Aggregate
Intrinsic
Value
Balance—December 31, 20183.0 $35.53 4.0$105.6 
Granted0.7 85.02 
Forfeited(0.1)62.93 
Exercised(0.9)30.21 
Balance—December 31, 20192.7 50.37 4.5150.3 
Granted0.6 118.80 
Forfeited(0.1)91.52 
Exercised(0.5)41.49 
Balance—December 31, 20202.7 67.53 4.2220.4 
Granted0.6 186.28 
Forfeited(0.1)122.65 
Exercised(0.5)55.07 
Balance—December 31, 20212.7 $92.87 
Options vested and expected to vest—December 31, 20212.7 $92.87 4.0$729.9 
Options exercisable—December 31, 20211.7 $58.53 2.9$496.7 
Schedule of Share-based Compensation, Stock Options, Activity, Additional Information
Additional information related to our stock options is summarized below (in millions, except per share amounts):
Year Ended December 31,
202120202019
Weighted-average fair value per share granted $60.76 $35.79 $27.19 
Intrinsic value of options exercised $83.5 $43.5 $54.6 
Fair value of options vested$17.2 $13.5 $10.1 
Schedule of Range of Options
The following table summarizes information about outstanding and exercisable stock options as of December 31, 2021, as follows (in millions, except exercise prices and contractual life):
 
 Options OutstandingOptions Exercisable
Range of Exercise Prices Number
Outstanding		Weighted-
Average
Remaining
Contractual
Life (Years)		Weighted-
Average
Exercise
Price 		Number
Exercisable		Weighted-
Average
Exercise
Price
$23.83-$23.83
0.3 1.1$23.83 0.3 $23.83 
$31.39-$39.49
0.3 1.936.43 0.4 36.43 
$48.83-$72.75
0.5 3.050.10 0.5 49.91 
$76.22-$343.51
1.6 5.2131.05 0.5 98.79 
2.7 1.7 
Schedule of Share-based Payment Award Employee Stock Purchase Plan Additional Information
Additional information related to the ESPP is provided below (in millions, except per share amounts):
December 31,
2019
Shares issued under the ESPP0.3 
Weighted-average price per share issued $64.79 
Schedule of Shares Reserved for Future Issuance
The following table presents the common stock reserved for future issuance (in millions):
December 31,
2021
Reserved for future equity award grants11.8 
Outstanding stock options and RSUs5.9 
Total common stock reserved for future issuances17.7 
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Stock-based compensation expense, including stock-based compensation expense related to awards classified as liabilities, is included in costs and expenses as follows (in millions):
 Year Ended December 31,
 202120202019
Cost of product revenue$1.7 $1.6 $1.5 
Cost of service revenue15.7 12.9 11.3 
Research and development56.7 47.6 38.7 
Sales and marketing110.0 108.4 101.7 
General and administrative27.1 23.3 20.9 
Total stock-based compensation expense$211.2 $193.8 $174.1 
Schedule of Employee Service Share based Compensation Allocation of Recognized Period Costs by Award Type
The following table summarizes stock-based compensation expense, including stock-based compensation expense related to awards classified as liabilities, by award type (in millions):
 Year Ended December 31,
 202120202019
RSUs$191.8 $179.7 $160.2 
Stock options19.4 14.1 12.6 
ESPP— — 1.3 
Total stock-based compensation expense$211.2 $193.8 $174.1 
Income Tax Benefit from Stock Option Plans
Total income tax benefit associated with stock-based compensation that is recognized in the consolidated statements of income is as follows (in millions):
Year Ended December 31,
202120202019
Income tax benefit associated with stock-based compensation $45.4 $42.1 $38.3