Share-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2013

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,
		2013			2012
Expected stock price volatility		33	%		34	%
Expected term, in years		4.6			4.6
Risk-free interest rate		0.9	%		0.8	%
Weighted average fair value of options granted	$	26.58		$	26.36