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Stock-Based Compensation Programs (Tables) | 6 Months Ended
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Jun. 30, 2017
Stock-Based Compensation Programs |
Schedule of weighted average assumptions used for estimating fair values of options |
|  | April 2017 |  | January 2017 |  | July 2016 |  | January 2016 |
Expected dividend yield |  | 1.06 | % | 0.68 | % | 0.73 | % | 0.79 | %
Expected stock price volatility |  | 18.89 | % | 20.49 | % | 24.14 | % | 29.25 | %
Risk-free interest rate |  | 1.95 | % | 2.07 | % | 1.22 | % | 1.57 | %
Expected life of options (in years) |  | 5.94 | years | 5.94 | years | 6.10 | years | 5.94 | years

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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