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Stock-Based Compensation and Stockholder's Equity (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based Payment Arrangement, Noncash Expense [Abstract] |
Summary of RSU Activity Including Performance Awards and Converted Isle Awards | A summary of the RSUs activity for the year ended December 31, 2021 is presented in the following table:
| Units |  | Weighted Average Grant Date Fair Value (a)
Unvested outstanding as of December 31, 2020 | 2,414,111 |  |  | $ | 42.55 |
Granted (b) | 927,016 |  |  | 86.37 |
Vested | (1,136,673) |  |  | 33.49 |
Forfeited | (113,847) |  |  | 54.34 |
Unvested outstanding as of December 31, 2021 | 2,090,607 |  |  | 61.47 |
____________________ (a)Represents the weighted-average grant date fair value of RSUs, which is the share price of our common stock on the grant date. (b)Included are 23,139 RSUs granted to non-employee members of the Board during the year ended December 31, 2021. A summary of the PSUs activity for the year ended December 31, 2021 is presented in the following table:
| Units |  | Weighted Average Grant Date Fair Value (a)
Unvested outstanding as of December 31, 2020 (b) | 500,483 |  |  | $ | 48.32 |
Granted | 81,006 |  |  | 112.28 |
Vested | (161,556) |  |  | 37.49 |
Forfeited | (2,864) |  |  | 73.21 |
Unvested outstanding as of December 31, 2021 | 417,069 |  |  | 62.20 |
____________________ (a)Grant date fair value, for which compensation expense of these unvested awards is measured, has not been achieved. This represents the quoted market price of our common stock on the dated indicated. (b)PSUs were presented with RSUs as of December 31, 2020 in the 2020 Annual Report.
Share-based Payment Arrangement, Activity | A summary of the MSUs activity for the year ended December 31, 2021 is presented in the following table:
| Units |  | Weighted- Average Fair Value (a)
Unvested outstanding as of December 31, 2020 | 446,087 |  |  | $ | 49.37 |
Granted | 147,471 |  |  | 102.98 |
Vested | (208,866) |  |  | 28.56 |
Forfeited | (2,769) |  |  | 84.12 |
Unvested outstanding as of December 31, 2021 | 381,923 |  |  | 77.09 |
____________________ (a)Represents the grant date fair value determined using a Monte Carlo simulation model.
Schedule of Share-based Compensation, Stock Options Activity |
Stock Option Activity |  |  |  |  |  |  |  |  |
| Shares |  | Weighted Average Exercise Price |  |  |  | Weighted Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value (in millions)
Outstanding as of December 31, 2020 | 176,724 |  |  | $ | 22.57 |  |  |  |  | 1.71 |  | $ | 9 |
Exercised | (114,884) |  |  | 22.64 |  |  |  |  |  |  |
Forfeited | (1,233) |  |  | 26.65 |  |  |  |  |  |  |
Expired | (16,702) |  |  | 26.67 |  |  |  |  |  |  |
Outstanding as of December 31, 2021 | 43,905 |  |  | 20.69 |  |  |  |  | 1.05 |  | 3 |
Vested and expected to vest as of December 31, 2021 | 43,905 |  |  | 20.69 |  |  |  |  | 1.05 |  | 3 |
Exercisable as of December 31, 2021 | 42,610 |  |  | 20.84 |  |  |  |  | 1.05 |  | 3 |
Stock Option Exercises |  |  |  |  |
| Years Ended December 31,
(Dollars in millions) | 2021 |  | 2020 |  | 2019
Option Exercises: |  |  |  |  |
Number of options exercised | 114,884 |  |  | 70,608 |  |  | — |
Cash received for options exercised | $ | 3 |  |  | $ | 1 |  |  | $ | — |
Aggregate intrinsic value of options exercised | $ | 9 |  |  | $ | 5 |  |  | $ | — |

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