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Earnings Per Share
9 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
Earnings Per Share
Earnings Per Share ("EPS")
There are no adjustments required to be made to net income for purposes of computing EPS. The average number of common shares outstanding is reconciled to those used in the basic and diluted EPS computations as follows:
 
 
Three Months Ended
September 30
 
Nine Months Ended
September 30
(Millions of shares)
 
2017
 
2016
 
2017
 
2016
Basic
 
352.7

 
359.2

 
354.4

 
360.0

Dilutive effect of stock options and restricted share unit awards
 
2.1

 
2.3

 
2.3

 
2.4

Diluted
 
354.8

 
361.5

 
356.7

 
362.4


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. The number of common shares outstanding as of September 30, 2017 and 2016 was 351.9 million and 358.4 million, respectively.