Earnings per Share (Tables)

9 Months Ended

Sep. 30, 2014

Earnings per Share [Abstract]

Weighted-Average Shares Outstanding for Computation of Basic and Diluted Income per Common Share

	Three Months Ended		Nine Months Ended
	September 30,		September 30,
(Weighted-average shares)	2014	2013	2014	2013
Basic method	177,535,503	186,938,328	179,259,573	188,914,000
Dilutive stock options and restricted stock units	1,320,575	1,399,183	1,318,512	1,331,166
Diluted method	178,856,078	188,337,511	180,578,085	190,245,166

Anti Dilutive Securities Not Included in Computation of Diluted EPS

	Three Months Ended				Nine Months Ended
		September 30,			September 30,
		2014	2013		2014		2013
Antidilutive stock options excluded from diluted shares		1,998,009		1,165,464		1,855,667		941,155
Weighted average price of these options	$	58.53	$	54.56	$	58.80	$	54.40