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Equity-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Summary of Stock Option Activity | Equity Plan Activity The following table summarizes stock option activity:
|  | Number of Shares of Class A Common Stock (#) |  | Weighted- Average Grant- Date Fair Value ($) |  | Weighted- Average Exercise Price ($) |  | Weighted- Average Remaining Contractual Life (in years) |  | Aggregate Intrinsic Value ($)
Outstanding at December 31, 2017 |  | 13,460 |  |  |  |  | 18.63 |  |  |  |  |
Granted |  | 1,208 |  |  | 22.19 |  |  | 61.49 |  |  |  |  |
Exercised |  | (4,779) |  |  |  |  | 14.08 |  |  |  |  | 246.4 |
Forfeited |  | (362) |  |  |  |  | 34.05 |  |  |  |  |
Outstanding at December 31, 2018 |  | 9,527 |  |  |  |  | 25.77 |  |  |  |  |
Granted |  | 1,401 |  |  | 24.91 |  |  | 71.74 |  |  |  |  |
Exercised |  | (3,976) |  |  |  |  | 17.78 |  |  |  |  | 213.8 |
Forfeited |  | (648) |  |  |  |  | 54.43 |  |  |  |  |
Outstanding at December 31, 2019 |  | 6,304 |  |  |  |  | 38.08 |  |  |  |  |
Granted |  | 154 |  |  | 22.33 |  |  | 68.05 |  |  |  |  |
Exercised |  | (2,613) |  |  |  |  | 29.71 |  |  |  |  | 121.0 |
Forfeited |  | (417) |  |  |  |  | 62.82 |  |  |  |  |
Outstanding at December 31, 2020 |  | 3,428 |  |  |  |  | 42.79 |  |  | 6.0 |  | 137.6 |
Vested at December 31, 2020 |  | 2,458 |  |  |  |  | 33.90 |  |  | 5.2 |  | 120.6 |
Summary of Stock Award Activity | The following table summarizes stock award activity:
|  | Number of Shares of Class A Common Stock (#) |  |
Outstanding at December 31, 2017(1) |  | 4,199 |  |  |
Granted |  | 3,152 |  |  |
Vested |  | (1,545) |  |  |
Forfeited |  | (450) |  |  |
Outstanding at December 31, 2018(1) |  | 5,356 |  |  |
Granted |  | 3,057 |  |  |
Vested |  | (2,187) |  |  |
Forfeited |  | (986) |  |  |
Outstanding at December 31, 2019(1) |  | 5,240 |  |  |
Granted |  | 4,157 |  |  |
Vested |  | (2,368) |  |  |
Forfeited |  | (896) |  |  |
Outstanding at December 31, 2020 |  | 6,133 |  |  |
_________________________________ (1) Includes financial-based PSUs for which performance targets have not yet been established, and which are not yet considered granted for accounting purposes. The balance of outstanding awards is comprised of the following:
| Number of Shares of Class A Common Stock (#) |  | Weighted Average Fair Value Per Share ($)
RSUs | 3,952 |  |  | 53.77
Financial-based PSUs granted for accounting purposes | 505 |  |  | 63.18
Financial-based PSUs not yet granted for accounting purposes | 899 |  |  | N/A
Outstanding at December 31, 2018 | 5,356 |  |  |
RSUs | 4,247 |  |  | 65.12
Financial-based PSUs granted for accounting purposes | 401 |  |  | 73.28
Financial-based PSUs not yet granted for accounting purposes | 592 |  |  | N/A
Outstanding at December 31, 2019 | 5,240 |  |  |
RSUs | 5,356 |  |  | 70.54
TSR-based RSUs | 349 |  |  | 106.14
Financial-based PSUs granted for accounting purposes | 223 |  |  | 66.97
Financial-based PSUs not yet granted for accounting purposes | 205 |  |  | N/A
Outstanding at December 31, 2020 | 6,133 |  |  |

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