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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2016
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)
 
2016
 
2015
 
2014
Basic
 
359.4

 
363.8

 
374.5

Dilutive effect of stock options and restricted share unit awards
 
2.3

 
2.5

 
2.9

Diluted
 
361.7

 
366.3

 
377.4
Options Outstanding not Included in Computation of Diluted EPS
Options outstanding that were not included in the computation of diluted EPS because their exercise price was greater than the average market price of the common shares were insignificant.