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Stock-based Compensation | 6 Months Ended
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Jun. 30, 2021
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 March 31, 2021 | 940.3 |  | 439.1 |  |  | 1,379.4 |  |  | $ | 134.84 |  | 1.70
Granted | 200.5 |  | 107.2 |  |  | 307.7 |  |  | 186.21 |  |
Vested | (10.7) |  | — |  |  | (10.7) |  |  | 142.07 |  |
Forfeited | (12.0) |  | (1.1) |  |  | (13.1) |  |  | 123.85 |  |
Unvested as of June 30, 2021 | 1,118.1 |  | 545.2 |  |  | 1,663.3 |  |  | $ | 144.01 |  | 1.92
Unvested as of March 31, 2020 | 1,208.9 |  | 286.8 |  |  | 1,495.7 |  |  | $ | 144.71 |  | 1.78
Granted | 152.3 |  | 272.0 |  |  | 424.3 |  |  | 113.67 |  |
Vested | (10.2) |  | — |  |  | (10.2) |  |  | 118.91 |  |
Forfeited | (7.8) |  | — |  |  | (7.8) |  |  | 143.09 |  |
Unvested as of June 30, 2020 | 1,343.2 |  | 558.8 |  |  | 1,902.0 |  |  | $ | 137.93 |  | 2.01
| 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 | 257.1 |  | 107.2 |  |  | 364.3 |  |  | 179.95 |  |
Vested | (218.1) |  | (79.0) |  |  | (297.1) |  |  | 150.45 |  |
Forfeited | (17.1) |  | (14.5) |  |  | (31.6) |  |  | 138.47 |  |
Unvested as of June 30, 2021 | 1,118.1 |  | 545.2 |  |  | 1,663.3 |  |  | $ | 144.01 |  | 1.92
Unvested as of December 31, 2019 | 1,532.3 |  | 286.8 |  |  | 1,819.1 |  |  | $ | 141.51 |  | 2.39
Granted | 162.0 |  | 272.0 |  |  | 434.0 |  |  | 118.66 |  |
Vested | (334.8) |  | — |  |  | (334.8) |  |  | 136.36 |  |
Forfeited | (16.3) |  | — |  |  | (16.3) |  |  | 140.22 |  |
Unvested as of June 30, 2020 | 1,343.2 |  | 558.8 |  |  | 1,902.0 |  |  | $ | 137.93 |  | 2.01
As of June 30, 2021, we had $104.0 million of unamortized deferred compensation related to unvested RSUs and PSUs, which we anticipate recognizing over varying periods into 2026; $16.7 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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