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Share-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2017
Share-based Compensation [Abstract] |
Fair Value Assumptions for Performance Awards | The fair values of the senior executives' performance share award grants with a TSR modifier for grants in 2017 and 2016 were $64.82 and $38.54, respectively, which were estimated using the Monte Carlo valuation model, and incorporated the following assumptions:
| 2017 |  | 2016
Risk-free interest rate | 1.5 | % |  | 0.8 | %
Dividend yield | 1.1 | % |  | 1.0 | %
Volatility factor | 38.3 | % |  | 40.8 | %
Expected life of award | 2.9 years |  |  | 2.9 years |

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- Definition Schedule of Share-based Payment Award, Equity Instruments Other than Options, Valuation Assumptions [Table Text Block] + References No definition available. + Details
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