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Share-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2019
Share-based Payment Arrangement [Abstract] |
Summary of stock option, restricted stock unit and performance share unit activity | A summary of stock option, restricted stock unit and performance share unit grant activity is as follows:
| Six Months Ended June 30,
| 2019 |  | 2018
| Shares Granted (In thousands) |  | Weighted-Average Grant Date Fair Value |  | Shares Granted (In thousands) |  | Weighted-Average Grant Date Fair Value
Stock options | 1,171 |  |  | $ | 28.43 |  |  | 1,265 |  |  | $ | 22.43 |
Restricted stock units | 371 |  |  | 84.84 |  |  | 501 |  |  | 70.14 |
Performance share units | — |  |  | — |  |  | 165 |  |  | 75.39 |

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- Definition Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Grants in Period, Grant Date Intrinsic Value [Table Text Block] + References No definition available. + Details
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