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Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2020
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,
 
2020
 
2019
Weighted average number of common shares outstanding used to compute basic earnings per share
52.8

 
52.6

Dilutive effect of stock-based awards
0.5

 
0.6

Number of shares used to compute diluted earnings per share
53.3

 
53.2