Earnings per Share (Tables) (Tables)

9 Months Ended

Sep. 30, 2019

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

Basic earnings per share are based upon the weighted-average number of shares of common stock outstanding. Diluted earnings per share are based upon the weighted-average number of shares of common stock outstanding, plus all potentially dilutive securities that were assumed to be converted into common shares at the beginning of the period under the treasury stock method. Our potentially dilutive securities consist of stock options, SSARs, restricted stock or units and performance share awards.

	Quarter Ended		Nine Months Ended
	September 30,		September 30,
	2019	2018	2019	2018
Denominator for basic earnings per share:
Weighted average common shares outstanding - basic	121.4	142.5	125.1	143.9
Effect of dilutive securities:
Dilutive effect of employee stock plans	0.8	1.4	0.9	1.7
Denominator for diluted earnings per share:
Weighted average shares outstanding - diluted	122.2	143.9	125.9	145.6