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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Performance-Based Option Activity | Performance-based option activity under the 2007 SIP, the 2013 SIP, and the 2018 EIP was as follows:
|  | Shares |  |  | Weighted Average Exercise Price (per share) |  |  | Weighted Average Remaining Contractual Term (in years) |  |  | Aggregate Intrinsic Value (in millions) |
Performance-based options outstanding at December 31, 2017 |  |  | 1,038,147 |  |  | $ | 13.46 |  |  |  | 3.5 |  |  | $ | — |
Granted |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Exercised |  |  | (663,412 | ) |  |  | (13.46 | ) |  |  | — |  |  |  | — |
Forfeited or expired |  |  | (8,358 | ) |  |  | (13.46 | ) |  |  | — |  |  |  | — |
Performance-based options outstanding at December 31, 2018 |  |  | 366,377 |  |  | $ | 13.50 |  |  |  | 3.1 |  |  | $ | 7.7 |
Granted |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Exercised |  |  | (298,096 | ) |  |  | (13.48 | ) |  |  | — |  |  |  | — |
Forfeited or expired |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Performance-based options outstanding at December 31, 2019 |  |  | 68,281 |  |  | $ | 13.58 |  |  |  | 2.6 |  |  | $ | 3.7 |
Granted |  |  | 1,818,728 |  |  |  | 65.27 |  |  |  | — |  |  |  | — |
Exercised |  |  | (42,730 | ) |  |  | (13.46 | ) |  |  | — |  |  |  | — |
Forfeited or expired |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Performance-based options outstanding at December 31, 2020 |  |  | 1,844,279 |  |  | $ | 64.55 |  |  |  | 9.2 |  |  | $ | 77.5 |
Performance-based options exercisable at December 31, 2020 |  |  | 25,551 |  |  | $ | 13.78 |  |  |  | 1.7 |  |  | $ | 2.4 |
Summary of Term-Based Stock Option Activity | Term-based stock option activity under the 2007 SIP, the 2013 SIP, and the 2018 EIP, was as follows:
|  | Shares |  |  | Weighted Average Exercise Price (per share) |  |  | Weighted Average Remaining Contractual Term (in years) |  |  | Aggregate Intrinsic Value (in millions) |
Term-based options outstanding at December 31, 2017 |  |  | 10,994,181 |  |  | $ | 16.52 |  |  |  | 6.9 |  |  | $ | 48.8 |
Granted |  |  | 5,236,037 |  |  |  | 23.07 |  |  |  | — |  |  |  | — |
Exercised |  |  | (2,501,983 | ) |  |  | (15.26 | ) |  |  | — |  |  |  | — |
Forfeited or expired |  |  | (178,466 | ) |  |  | (17.30 | ) |  |  | — |  |  |  | — |
Term-based options outstanding at December 31, 2018 |  |  | 13,549,769 |  |  | $ | 19.28 |  |  |  | 7.5 |  |  | $ | 206.8 |
Granted |  |  | 4,297,472 |  |  |  | 49.74 |  |  |  | — |  |  |  | — |
Exercised |  |  | (4,358,867 | ) |  |  | (17.37 | ) |  |  | — |  |  |  | — |
Forfeited or expired |  |  | (343,437 | ) |  |  | (24.14 | ) |  |  | — |  |  |  | — |
Term-based options outstanding at December 31, 2019 |  |  | 13,144,937 |  |  | $ | 29.74 |  |  |  | 7.8 |  |  | $ | 501.3 |
Granted |  |  | 2,282,334 |  |  |  | 66.06 |  |  |  | — |  |  |  | — |
Exercised |  |  | (3,889,096 | ) |  |  | (20.42 | ) |  |  | — |  |  |  | — |
Forfeited or expired |  |  | (555,101 | ) |  |  | (32.09 | ) |  |  | — |  |  |  | — |
Term-based options outstanding at December 31, 2020 |  |  | 10,983,074 |  |  | $ | 40.47 |  |  |  | 7.8 |  |  | $ | 725.9 |
Term-based options exercisable at December 31, 2020 |  |  | 3,085,305 |  |  | $ | 28.50 |  |  |  | 6.8 |  |  | $ | 240.9 |
Other Information Pertaining to Term-Based Options | Other information pertaining to term-based options was as follows:
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Weighted average grant date fair value per share |  | $ | 21.15 |  |  | $ | 16.12 |  |  | $ | 7.80 |
Fair Value of Stock Option Estimated Using Black-Scholes Option Pricing Model | The fair value of the term-based stock options was estimated at the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions:
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Expected volatility |  |  | 29.8 | % |  |  | 24.9 | % |  |  | 25.0 | %
Expected dividend rate |  |  | — |  |  |  | — |  |  |  | — |
Risk-free interest rate |  |  | 0.6 | % |  |  | 2.5 | % |  |  | 2.9 | %
Summary of Restricted Stock Units Activity | RSU activity under the 2013 SIP and the 2018 EIP, was as follows:
|  | Shares |
RSUs outstanding at December 31, 2017 |  |  | 605,990 |
Granted |  |  | 164,073 |
Shares issued upon vesting of RSUs |  |  | (105,990 | )
Forfeited or canceled |  |  | — |
RSUs outstanding at December 31, 2018 |  |  | 664,073 |
Granted |  |  | 193,033 |
Shares issued upon vesting of RSUs |  |  | (17,288 | )
Forfeited or canceled |  |  | (20,000 | )
RSUs outstanding at December 31, 2019 |  |  | 819,818 |
Granted |  |  | 685,997 |
Shares issued upon vesting of RSUs |  |  | (73,475 | )
Forfeited or canceled |  |  | (42,955 | )
RSUs outstanding at December 31, 2020 |  |  | 1,389,385 |
RSUs releasable at December 31, 2020 |  |  | 423,479 |
Other Information Pertaining to RSUs | Other information pertaining to RSUs was as follows:
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Weighted average grant date fair value per share |  | $ | 69.57 |  |  | $ | 50.00 |  |  | $ | 35.55 |
Summary of Global Employee Stock Purchase Plan Activity | Our GESPP activity was as follows:
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |
Shares issued |  |  | 182,899 |  |  |  | 261,895 |
Purchase price (per share) |  | $ | 54.90 |  |  | $ | 28.70 |
Summary of Fair Value of Stock Purchase Rights Granted under the Global Employee Stock Purchase Plan Estimated Using Weighted-Average Assumptions | The fair value of the stock purchase rights granted under the GESPP was estimated using the following weighted-average assumptions:
|  | Year Ended December 31, 2020 |  | Year Ended December 31, 2019 |
Expected volatility |  |  | 46.4 | % |  | 34.8 | %
Expected dividend rate |  |  | — |  |  | — |
Risk-free interest rate |  |  | 1.1 | % |  | 2.2 | %
Expected term (in years) |  |  | 0.3 |  |  | 0.4 |
Grant date fair value per share |  | $ | 17.11 |  | $ | 9.32 |

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