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Accounting Policies Stock Option Assumptions (Tables) | 12 Months Ended
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Dec. 31, 2018
Share-based Compensation [Abstract] |
Schedule of Share-based Payment Award, Valuation Assumptions [Table Text Block] | The following table contains the weighted-average assumptions used to estimate the fair value of options granted. These assumptions are subjective and changes in these assumptions can materially affect the fair value estimate.
| December 31, 2018 |  | December 31, 2017 |  | December 31, 2016
Expected dividend yield | 1.1 | % |  | 1.3 | % |  | 1.0 | %
Expected stock price volatility | 24.4 | % |  | 28.5 | % |  | 28.9 | %
Weighted average risk-free interest rate | 2.7 | % |  | 2.0 | % |  | 1.3 | %
Expected life of options (years) | 6.1 |  |  | 5.9 |  |  | 5.8 |
The fair value of non-vested shares issued were estimated using the closing market prices for the business day of the grant. The share-based compensation for the non-vested shares is recognized ratably over the requisite service period or vesting period. The fair value of the performance shares was estimated using a Monte Carlo simulation. The share-based compensation for performance shares are recognized ratably over the requisite service period, or vesting period. The following table contains the weighted-average assumptions used to estimate the fair value of performance shares granted. These assumptions are subjective and changes in these assumptions can materially affect the fair value estimate.
|  |  | Year ended |  |
| December 31, 2018 |  | December 31, 2017 |  | December 31, 2016
Expected stock price volatility | 24.3 | % |  | 24.7 | % |  | 22.3 | %
Weighted average risk-free interest rate | 2.2 | % |  | 1.4 | % |  | 0.8 | %

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of share-based payment awards, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, and (d) risk-free rate(s). + References No definition available. + Details
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- References No definition available. + Details
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