Earnings per Share (Tables)

6 Months Ended

Jun. 30, 2015

Earnings per Share [Abstract]

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

	Three Months Ended		Six Months Ended
	June 30,		June 30,
(Weighted-average shares)	2015	2014	2015	2014
Basic method	174,488,842	178,500,440	176,343,309	180,003,605
Dilutive stock options and restricted stock units*	–	1,544,580	–	1,324,309
Diluted method	174,488,842	180,045,020	176,343,309	181,327,914

Anti Dilutive Securities Not Included in Computation of Diluted EPS

	Three Months Ended				Six Months Ended
		June 30,			June 30,
		2015	2014		2015		2014
Antidilutive stock options excluded from diluted shares		5,988,668		1,161,442		5,767,975		1,810,012
Weighted average price of these options	$	53.12	$	60.02	$	53.31	$	58.90