Earnings per Share (Tables)

12 Months Ended

Dec. 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):

	Year Ended December 31,
	2019	2018	2017
Weighted average number of common shares outstanding used to compute basic earnings per share	52.8	52.3	52.5
Dilutive effect of stock-based awards	0.6	0.8	0.7
Number of shares used to compute diluted earnings per share	53.4	53.1	53.2