Earnings per Share (Tables)

9 Months Ended

Sep. 30, 2015

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)	2015	2014	2015	2014
Basic method	172,205,433	177,535,503	175,047,295	179,259,573
Dilutive stock options and restricted stock units*	–	1,320,575	–	1,318,512
Diluted method	172,205,433	178,856,078	175,047,295	180,578,085

Anti Dilutive Securities Not Included in Computation of Diluted EPS

	Three Months Ended				Nine Months Ended
		September 30,			September 30,
		2015	2014		2015		2014
Antidilutive stock options excluded from diluted shares		5,807,453		1,998,009		5,770,731		1,855,667
Weighted average price of these options	$	53.13		58.53		53.25		58.80