Earnings per Share (Tables)

12 Months Ended

Dec. 31, 2015

Earnings per Share [Abstract]

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

(Weighted-average shares)	2015	2014	2013
Basic method	174,351,227	178,852,942	187,921,062
Dilutive stock options and restricted stock units *	–	1,218,042	1,350,336
Diluted method	174,351,227	180,070,984	189,271,398

Anti Dilutive Securities Not Included in Computation of Diluted EPS

	2015	2014	2013
Antidilutive stock options excluded from diluted shares	5,443,288	1,893,364	1,026,900
Weighted average price of these options	$52.93	$55.21	$54.54