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Earnings Per Share (Tables)
12 Months Ended
Dec. 31, 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:
(Millions of shares)
 
2018
 
2017
 
2016
Basic
 
348.0

 
353.6

 
359.4

Dilutive effect of stock options and restricted share unit awards
 
1.6

 
2.3

 
2.3

Diluted
 
349.6

 
355.9

 
361.7