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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2015
Stock-Based Compensation |
Schedule of weighted-average assumptions for stock options |
|  | 2015 |  | 2014 |
Expected dividend yield |  | 1.1 | % | 1.2 | %
Expected life in years |  | 5.71 |  | 5.74 |
Expected volatility |  | 27.3 | % | 29.3 | %
Risk-free interest rate |  | 1.4 | % | 1.7 | %
Weighted-average fair value |  | $ | 21.19 |  | $ | 19.15 |

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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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