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Share-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [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:
| Three Months Ended March 31,
| 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 |  |  | 1,193 |  |  | $ | 22.40 |
Restricted stock units | 317 |  |  | 84.34 |  |  | 374 |  |  | 69.77 |
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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