Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

Computations of Basic and Diluted Earnings per Share

The weighted average number of common shares used in the calculation of basic and diluted earnings per share consisted of the following (in millions):

	First Quarter
	2019	2018
Weighted average basic common shares outstanding	36.1	35.6
Effect of dilutive securities (primarily stock options)	1.1	1.2
Weighted average diluted common shares outstanding	37.2	36.8