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Earnings Per Share
9 Months Ended
Sep. 30, 2016
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. A reconciliation of the average number of common shares outstanding used in the basic and diluted EPS computations follows:
 
 
Three Months Ended
September 30
 
Nine Months Ended
September 30
(Millions of shares)
 
2016
 
2015
 
2016
 
2015
Basic
 
359.2

 
363.9

 
360.0

 
364.5

Dilutive effect of stock options and restricted share unit awards
 
2.3

 
2.3

 
2.4

 
2.4

Diluted
 
361.5

 
366.2

 
362.4

 
366.9


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, 2016 and 2015 was 358.4 million and 363.3 million, respectively.