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Earnings Per Share
9 Months Ended
Sep. 30, 2015
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)
 
2015
 
2014
 
2015
 
2014
Basic
 
363.9

 
373.3

 
364.5

 
376.0

Dilutive effect of stock options
 
0.9

 
1.1

 
0.9

 
1.2

Dilutive effect of restricted share and restricted share unit awards
 
1.4

 
1.5

 
1.5

 
1.6

Diluted
 
366.2

 
375.9

 
366.9

 
378.8


There were no significant outstanding stock-based awards excluded from the computation of diluted EPS during the three and nine month periods ended September 30, 2015 and 2014.
The number of common shares outstanding as of September 30, 2015 and 2014 was 363.3 million and 372.5 million, respectively.