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Stock-based Compensation | 9 Months Ended
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Sep. 30, 2020
Share-based Payment Arrangement [Abstract] |
Stock-based Compensation | 7. 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, 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
Unvested as of June 30, 2019 | 436.7 |  | 259.6 |  |  | 696.3 |  |  | $ | 144.17 |  | 2.25
Granted | 1,130.1 |  | — |  |  | 1,130.1 |  |  | 141.14 |  |
Vested | (45.8 | ) | — |  |  | (45.8 | ) |  | 122.48 |  |
Forfeited | (8.1 | ) | — |  |  | (8.1 | ) |  | 138.96 |  |
Unvested as of September 30, 2019 | 1,512.9 |  | 259.6 |  |  | 1,772.5 |  |  | $ | 142.82 |  | 2.59
| 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, 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
Unvested as of December 31, 2018 | 559.6 |  | 93.1 |  |  | 652.7 |  |  | $ | 131.32 |  | 2.02
Granted | 1,243.4 |  | 166.9 |  |  | 1,410.3 |  |  | 149.22 |  |
Vested | (268.3 | ) | — |  |  | (268.3 | ) |  | 116.25 |  |
Forfeited | (21.8 | ) | (0.4 | ) |  | (22.2 | ) |  | 134.54 |  |
Unvested as of September 30, 2019 | 1,512.9 |  | 259.6 |  |  | 1,772.5 |  |  | $ | 142.82 |  | 2.59
As of September 30, 2020, we had $84.3 million of unamortized deferred compensation related to unvested RSUs and PSUs, which we anticipate recognizing over varying periods into 2024; $41.5 million relates to the awards issued in conjunction with the HFF acquisition.

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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- References No definition available. + Details
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