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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2020
Equity [Abstract] |
Restricted Share Activity | Activity for RSAs and PSUs is summarized below:
| RSAs |  | PSUs |  | Total |  | Weighted Average Grant Date Fair Value
Unvested balance, December 31, 2019 | 447,680 |  |  | 324,078 |  |  | 771,758 |  |  | $ | 102.01 |
Granted | 318,299 |  |  | 185,422 |  |  | 503,721 |  |  | 123.07 |
Vested | (160,927) |  |  | (7,368) |  |  | (168,295) |  |  | 93.34 |
Forfeited | (20,073) |  |  | (26,096) |  |  | (46,169) |  |  | 103.65 |
Unvested balance, June 30, 2020 | 584,979 |  |  | 476,036 |  |  | 1,061,015 |  |  | $ | 113.31 |
The aggregate fair values of RSAs and PSUs granted and vested are presented in the following table:
| Six Months Ended June 30, |  |
| 2020 |  | 2019
| (In millions) |  |
Granted: |  |  |
RSAs | $ | 39 |  |  | $ | 30 |
PSUs | 23 |  |  | 19 |
Total granted | $ | 62 |  |  | $ | 49 |
Vested: |  |  |
RSAs | $ | 20 |  |  | $ | 18 |
PSUs | 1 |  |  | 2 |
Total vested | $ | 21 |  |  | $ | 20 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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