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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2018
Earnings Per Share [Abstract]  
Average Common Shares Outstanding Basic and Diluted
The average number of common shares outstanding is reconciled to those used in the basic and diluted EPS computations as follows:
 
 
Three Months Ended
June 30
 
Six Months Ended
June 30
(Millions of shares)
 
2018
 
2017
 
2018
 
2017
Basic
 
348.8

 
354.4

 
349.6

 
355.2

Dilutive effect of stock options and restricted share unit awards
 
1.5

 
2.3

 
1.7

 
2.4

Diluted
 
350.3

 
356.7

 
351.3

 
357.6