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Stock-based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2021
Share-based Payment Arrangement [Abstract] |
Restricted Stock Unit and Performance Stock Unit Activity | Restricted stock unit ("RSU") and performance stock unit ("PSU") awards activity is presented in the following tables.
| RSU Shares (in 000's) | PSU Shares (in 000's) |  | Total Shares (in 000's) |  | Weighted Average Grant Date Fair Value | Weighted Average Remaining Contractual Life (in years)
Unvested as of June 30, 2021 | 1,118.1 |  | 545.2 |  |  | 1,663.3 |  |  | $ | 144.01 |  | 1.92
Granted | 23.7 |  | 58.8 |  |  | 82.5 |  |  | 205.50 |  |
Vested | (199.6) |  | — |  |  | (199.6) |  |  | 141.21 |  |
Forfeited | (6.9) |  | (9.4) |  |  | (16.3) |  |  | 145.07 |  |
Unvested as of September 30, 2021 | 935.3 |  | 594.6 |  |  | 1,529.9 |  |  | $ | 147.75 |  | 1.96
Unvested as of June 30, 2020 | 1,343.2 |  | 558.8 |  |  | 1,902.0 |  |  | $ | 137.93 |  | 2.01
Granted | 11.2 |  | 4.4 |  |  | 15.6 |  |  | 107.51 |  |
Vested | (213.5) |  | — |  |  | (213.5) |  |  | 140.38 |  |
Forfeited | (13.0) |  | (4.5) |  |  | (17.5) |  |  | 134.03 |  |
Unvested as of September 30, 2020 | 1,127.9 |  | 558.7 |  |  | 1,686.6 |  |  | $ | 137.49 |  | 1.85
| RSU Shares (in 000's) | PSU Shares (in 000's) |  | Total Shares (in 000's) |  | Weighted Average Grant Date Fair Value | Weighted Average Remaining Contractual Life (in years)
Unvested as of December 31, 2020 | 1,096.2 |  | 531.5 |  |  | 1,627.7 |  |  | $ | 137.42 |  | 1.69
Granted | 280.8 |  | 166.0 |  |  | 446.8 |  |  | 184.71 |  |
Vested | (417.8) |  | (79.0) |  |  | (496.8) |  |  | 146.76 |  |
Forfeited | (23.9) |  | (23.9) |  |  | (47.8) |  |  | 140.66 |  |
Unvested as of September 30, 2021 | 935.3 |  | 594.6 |  |  | 1,529.9 |  |  | $ | 147.75 |  | 1.96
Unvested as of December 31, 2019 | 1,532.3 |  | 286.8 |  |  | 1,819.1 |  |  | $ | 141.51 |  | 2.39
Granted | 173.1 |  | 276.4 |  |  | 449.5 |  |  | 114.19 |  |
Vested | (548.4) |  | — |  |  | (548.4) |  |  | 137.92 |  |
Forfeited | (29.1) |  | (4.5) |  |  | (33.6) |  |  | 136.96 |  |
Unvested as of September 30, 2020 | 1,127.9 |  | 558.7 |  |  | 1,686.6 |  |  | $ | 137.49 |  | 1.85

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