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Earnings Per Share
6 Months Ended
Jun. 30, 2019
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
June 30
 
Six Months Ended
June 30
(Millions of shares)
 
2019
 
2018
 
2019
 
2018
Basic
 
344.2

 
348.8

 
344.3

 
349.6

Dilutive effect of stock options and restricted share unit awards
 
1.8

 
1.5

 
1.7

 
1.7

Diluted
 
346.0

 
350.3

 
346.0

 
351.3


The impact of 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 was insignificant. The number of common shares outstanding as of June 30, 2019 and 2018 was 344.2 million and 347.9 million, respectively.