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Stock-based Compensation | 9 Months Ended
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Sep. 30, 2023
Share-Based Payment Arrangement [Abstract] |
Stock-based Compensation | STOCK-BASED COMPENSATION Stock Unit Awards 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, 2023 | 1,003.4 |  | 463.6 |  |  | 1,467.0 |  |  | $ | 174.54 |  | 1.85
Granted | 175.3 |  | 2.4 |  |  | 177.7 |  |  | 165.96 |  |
Vested | (66.4) |  | — |  |  | (66.4) |  |  | 145.97 |  |
Forfeited | (39.6) |  | (4.2) |  |  | (43.8) |  |  | 176.43 |  |
Unvested as of September 30, 2023 | 1,072.7 |  | 461.8 |  |  | 1,534.5 |  |  | $ | 174.73 |  | 1.78
Unvested as of June 30, 2022 | 939.0 |  | 576.9 |  |  | 1,515.9 |  |  | $ | 167.23 |  | 1.98
Granted | 59.9 |  | 1.6 |  |  | 61.5 |  |  | 172.22 |  |
Vested | (203.7) |  | — |  |  | (203.7) |  |  | 141.15 |  |
Forfeited | (10.2) |  | (10.6) |  |  | (20.8) |  |  | 158.85 |  |
Unvested as of September 30, 2022 | 785.0 |  | 567.9 |  |  | 1,352.9 |  |  | $ | 171.51 |  | 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, 2022 | 841.3 |  | 567.0 |  |  | 1,408.3 |  |  | $ | 170.78 |  | 1.79
Granted | 520.5 |  | 185.2 |  |  | 705.7 |  |  | 143.64 |  |
Vested | (227.1) |  | (257.2) |  |  | (484.3) |  |  | 120.53 |  |
Forfeited | (62.0) |  | (33.2) |  |  | (95.2) |  |  | 161.55 |  |
Unvested as of September 30, 2023 | 1,072.7 |  | 461.8 |  |  | 1,534.5 |  |  | $ | 174.73 |  | 1.78
Unvested as of December 31, 2021 | 912.4 |  | 646.0 |  |  | 1,558.4 |  |  | $ | 152.27 |  | 1.99
Granted | 248.4 |  | 114.6 |  |  | 363.0 |  |  | 214.90 |  |
Vested | (355.1) |  | (175.1) |  |  | (530.2) |  |  | 145.10 |  |
Forfeited | (20.7) |  | (17.6) |  |  | (38.3) |  |  | 165.51 |  |
Unvested as of September 30, 2022 | 785.0 |  | 567.9 |  |  | 1,352.9 |  |  | $ | 171.51 |  | 1.85
As of September 30, 2023, we had $99.4 million of unamortized deferred compensation related to unvested RSUs and PSUs, which we anticipate recognizing over varying periods into 2027. For the three and nine months ended September 30, 2023, we recorded $13.5 million of stock-based compensation expense reversal associated with the expected achievement against performance measures of certain PSU awards.

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