Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

Reconciliation of Shares Used to Compute Basic and Diluted Earnings per Share

The following is a reconciliation of the shares used to compute basic and diluted earnings per share (in millions):

	Three Months Ended
	March 31,
	2019	2018
Weighted average number of common shares outstanding used to compute basic earnings per share	52.6	52.2
Dilutive effect of stock-based awards	0.6	0.6
Number of shares used to compute diluted earnings per share	53.2	52.8