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Stock-based Compensation | 3 Months Ended
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Mar. 31, 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 December 31, 2020 | 1,096.2 |  | 531.5 |  |  | 1,627.7 |  |  | $ | 137.42 |  | 1.69
Granted | 56.6 |  | — |  |  | 56.6 |  |  | 145.93 |  |
Vested | (207.5) |  | (79.0) |  |  | (286.5) |  |  | 150.76 |  |
Forfeited | (5.0) |  | (13.4) |  |  | (18.4) |  |  | 149.11 |  |
Unvested as of March 31, 2021 | 940.3 |  | 439.1 |  |  | 1,379.4 |  |  | $ | 134.84 |  | 1.70
Unvested as of December 31, 2019 | 1,532.3 |  | 286.8 |  |  | 1,819.1 |  |  | $ | 141.51 |  | 2.39
Granted | 9.7 |  | — |  |  | 9.7 |  |  | 160.03 |  |
Vested | (324.6) |  | — |  |  | (324.6) |  |  | 136.91 |  |
Forfeited | (8.5) |  | — |  |  | (8.5) |  |  | 137.68 |  |
Unvested as of March 31, 2020 | 1,208.9 |  | 286.8 |  |  | 1,495.7 |  |  | $ | 144.71 |  | 1.78
As of March 31, 2021, we had $74.2 million of unamortized deferred compensation related to unvested RSUs and PSUs, which we anticipate recognizing over varying periods into 2026; $24.1 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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