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Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2020
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 RSU s 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, 2019 | 6.1 |  |  | $ | 64.56 |
Granted | 1.3 |  |  | 114.33 |
Forfeited | (0.1 | ) |  | 68.19 |
Vested | (1.0 | ) |  | 58.17 |
Balance—March 31, 2020 | 6.3 |  |  | $ | 75.96 |
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):
| Three Months Ended
| March 31, 2020 |  | March 31, 2019
Shares withheld for taxes | 0.3 |  |  | 0.4 |
Amount withheld for taxes | $ | 37.8 |  |  | $ | 32.0 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The following table summarizes the weighted-average assumptions relating to our employee stock options:
| Three Months Ended
| March 31, 2020 |  | March 31, 2019
Expected term in years | 4.4 |  |  | 4.4 |
Volatility | 33.5 | % |  | 34.2 | %
Risk-free interest rate | 1.3 | % |  | 2.5 | %
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, 2019 | 2.7 |  |  | $ | 50.37 |  |  |  |  |  |
Granted | 0.5 |  |  | 114.48 |  |  |  |  |
Forfeited | — |  |  | 59.28 |  |  |  |  |
Exercised | (0.2 | ) |  | 40.02 |  |  |  |  |
Balance—March 31, 2020 | 3.0 |  |  | $ | 62.41 |  |  |  |  |
Options vested and expected to vest—March 31, 2020 | 3.0 |  |  | $ | 62.41 |  |  | 4.8 |  | $ | 123.8 |
Options exercisable—March 31, 2020 | 1.5 |  |  | $ | 39.50 |  |  | 3.5 |  | $ | 90.3 |
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):
| Three Months Ended
| March 31, 2020 |  | March 31, 2019
Weighted-average fair value per share granted | $ | 33.82 |  |  | $ | 27.12 |
Intrinsic value of options exercised | $ | 13.1 |  |  | $ | 27.2 |
Fair value of options vested | $ | 6.0 |  |  | $ | 4.2 |
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):
| Three Months Ended
| March 31, 2020 |  | March 31, 2019
Cost of product revenue | $ | 0.4 |  |  | $ | 0.4 |
Cost of service revenue | 3.0 |  |  | 2.8 |
Research and development | 10.9 |  |  | 9.4 |
Sales and marketing | 25.7 |  |  | 25.4 |
General and administrative | 5.3 |  |  | 5.0 |
Total stock-based compensation expense | $ | 45.3 |  |  | $ | 43.0 |
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):
| Three Months Ended
| March 31, 2020 |  | March 31, 2019
RSUs | $ | 42.2 |  |  | $ | 39.2 |
Stock options | 3.1 |  |  | 2.5 |
ESPP | — |  |  | 1.3 |
Total stock-based compensation expense | $ | 45.3 |  |  | $ | 43.0 |
Income Tax Benefit from Stock Option Plans | Total income tax benefit associated with stock-based compensation that is recognized in the condensed consolidated statements of income is as follows (in millions):
| Three Months Ended
| March 31, 2020 |  | March 31, 2019
Income tax benefit associated with stock-based compensation | $ | 10.0 |  |  | $ | 10.0 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References No definition available. + Details
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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 + Details
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