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Stockholders' Equity (Tables) | 12 Months Ended
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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 Shares |  | Weighted-Average Grant Date Fair Value per Share
Balance—December 31, 2018 | 7.8 |  |  | $ | 46.07 |
Granted | 2.7 |  |  | 87.09 |
Forfeited | (0.7) |  |  | 55.13 |
Vested | (3.7) |  |  | 43.31 |
Balance—December 31, 2019 | 6.1 |  |  | 64.56 |
Granted | 1.9 |  |  | 121.16 |
Forfeited | (0.4) |  |  | 79.83 |
Vested | (2.9) |  |  | 58.20 |
Balance—December 31, 2020 | 4.7 |  |  | 90.46 |
Granted | 1.2 |  |  | 202.63 |
Forfeited | (0.4) |  |  | 114.96 |
Vested | (2.3) |  |  | 81.52 |
Balance—December 31, 2021 | 3.2 |  |  | $ | 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,
| 2021 |  | 2020 |  | 2019
Shares withheld for taxes | 0.8 |  |  | 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,
| 2021 |  | 2020 |  | 2019
Expected term in years | 4.4 |  | 4.4 |  | 4.4
Volatility | 39.1 | % |  | 34.8 | % |  | 34.3 | %
Risk-free interest rate | 0.5 | % |  | 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, 2018 | 3.0 |  |  | $ | 35.53 |  |  | 4.0 |  | $ | 105.6 |
Granted | 0.7 |  |  | 85.02 |  |  |  |  |
Forfeited | (0.1) |  |  | 62.93 |  |  |  |  |
Exercised | (0.9) |  |  | 30.21 |  |  |  |  |
Balance—December 31, 2019 | 2.7 |  |  | 50.37 |  |  | 4.5 |  | 150.3 |
Granted | 0.6 |  |  | 118.80 |  |  |  |  |
Forfeited | (0.1) |  |  | 91.52 |  |  |  |  |
Exercised | (0.5) |  |  | 41.49 |  |  |  |  |
Balance—December 31, 2020 | 2.7 |  |  | 67.53 |  |  | 4.2 |  | 220.4 |
Granted | 0.6 |  |  | 186.28 |  |  |  |  |
Forfeited | (0.1) |  |  | 122.65 |  |  |  |  |
Exercised | (0.5) |  |  | 55.07 |  |  |  |  |
Balance—December 31, 2021 | 2.7 |  |  | $ | 92.87 |  |  |  |  |
Options vested and expected to vest—December 31, 2021 | 2.7 |  |  | $ | 92.87 |  |  | 4.0 |  | $ | 729.9 |
Options exercisable—December 31, 2021 | 1.7 |  |  | $ | 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,
| 2021 |  | 2020 |  | 2019
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 Outstanding |  | Options 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 |  |  | 1.9 |  | 36.43 |  |  | 0.4 |  |  | 36.43 |
$48.83-$72.75 |  | 0.5 |  |  | 3.0 |  | 50.10 |  |  | 0.5 |  |  | 49.91 |
$76.22-$343.51 |  | 1.6 |  |  | 5.2 |  | 131.05 |  |  | 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 ESPP |  |  | 0.3 |
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 grants | 11.8 |
Outstanding stock options and RSUs | 5.9 |
Total common stock reserved for future issuances | 17.7 |
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,
| 2021 |  | 2020 |  | 2019
Cost of product revenue | $ | 1.7 |  |  | $ | 1.6 |  |  | $ | 1.5 |
Cost of service revenue | 15.7 |  |  | 12.9 |  |  | 11.3 |
Research and development | 56.7 |  |  | 47.6 |  |  | 38.7 |
Sales and marketing | 110.0 |  |  | 108.4 |  |  | 101.7 |
General and administrative | 27.1 |  |  | 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,
| 2021 |  | 2020 |  | 2019
RSUs | $ | 191.8 |  |  | $ | 179.7 |  |  | $ | 160.2 |
Stock options | 19.4 |  |  | 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,
| 2021 |  | 2020 |  | 2019
Income tax benefit associated with stock-based compensation | $ | 45.4 |  |  | $ | 42.1 |  |  | $ | 38.3 |

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