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Share-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2018
Share-Based Compensation [Abstract] |
Schedule Of Weighted Averages Of The Assumptions Used In Estimating The Fair Value Of Stock Option Awards |
﻿ |  |  |  |  |  |  |  |
﻿ |  | For the Three Months Ended
﻿ |  | March 31,
﻿ |  |  | 2018 |  |  |  | 2017 |
﻿ |  |  |  |  |  |  |  |
﻿Share price at grant |  | $ | 178.26 |  |  | $ | 141.60 |
﻿Expected stock price volatility |  |  | 24 | % |  |  | 26 | %
﻿Expected term, in years |  |  | 5.8 |  |  |  | 5.8 |
﻿Risk-free interest rate |  |  | 2.7 | % |  |  | 2.0 | %
﻿Weighted average fair value of options granted |  | $ | 52.49 |  |  | $ | 40.51 |
﻿

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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=96867065&loc=d3e5070-113901 + Details
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