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Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2017
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 March 31
(Millions of shares)
 
2017
 
2016
Basic
 
356.0

 
360.7

Dilutive effect of stock options and restricted share unit awards
 
2.6

 
2.7

Diluted
 
358.6

 
363.4