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Share-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2015
Share-Based Compensation [Abstract] |
Schedule Of Weighted Averages Of The Assumptions Used In Estimating The Fair Value Of Stock Option Awards |
|  | For the Nine Months Ended
|  | September 30,
|  |  | 2015 |  |  | 2014 |
Expected stock price volatility |  |  | 23 | % |  | 28 | %
Expected term, in years |  |  | 5.6 |  |  | 5.7 |
Risk-free interest rate |  |  | 1.5 | % |  | 1.5 | %
Weighted average fair value of options granted |  | $ | 19.72 |  | $ | 18.07 |

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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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