Share-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule Of Weighted Averages Of The Assumptions Used In Estimating The Fair Value Of Stock Option Awards

The weighted averages of the valuation assumptions used to determine the fair value of each option award on the date of grant and the weighted average estimated fair values were as follows: 

	For the Six Months Ended June 30,
	2018			2017
Share price at grant	$	179.56		$	142.66
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	$	52.99		$	40.79