Earnings per Share (Tables)

3 Months Ended

Mar. 31, 2019

Earnings per Share [Abstract]

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

	Three Months Ended
	March 31,
(Weighted-average shares)	2019	2018
Basic method	173,341,304	172,805,065
Dilutive stock options and restricted stock units	1,150,039	1,814,459
Diluted method	174,491,343	174,619,524

Anti Dilutive Securities Not Included in Computation of Diluted EPS

	Three Months Ended
		March 31,
		2019	2018
Antidilutive stock options excluded from diluted shares		3,140,065		3,798,792
Weighted average price of these options	$	46.18	$	50.77