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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2020
Equity [Abstract] |
Restricted Share Activity | Activity for RSAs and PSUs is summarized below:
| RSAs |  | Weighted Average Grant Date Fair Value |  | PSUs |  | Weighted Average Grant Date Fair Value
Unvested balance, December 31, 2019 | 447,680 |  |  | $ | 102.41 |  |  | 324,078 |  |  | $ | 101.45 |
Granted | 334,233 |  |  | 125.99 |  |  | 187,028 |  |  | 123.09 |
Vested | (166,115) |  |  | 96.19 |  |  | (7,368) |  |  | 68.16 |
Forfeited | (26,439) |  |  | 114.48 |  |  | (29,271) |  |  | 98.72 |
Unvested balance, September 30, 2020 | 589,359 |  |  | $ | 116.99 |  |  | 474,467 |  |  | $ | 110.67 |
The aggregate fair values of RSAs and PSUs granted and vested are presented in the following table:
| Nine Months Ended September 30,
| 2020 |  | 2019
| (In millions)
Granted: |  |  |
RSAs | $ | 42 |  |  | $ | 32 |
PSUs | 23 |  |  | 19 |
Total granted | $ | 65 |  |  | $ | 51 |
Vested: |  |  |
RSAs | $ | 21 |  |  | $ | 18 |
PSUs | 1 |  |  | 2 |
Total vested | $ | 22 |  |  | $ | 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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