Share-Based Compensation (Tables)

3 Months Ended

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