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Earnings Per Share (Tables)
12 Months Ended
Dec. 31, 2014
Earnings Per Share [Abstract]  
Common Share Data Used for Computing Basic and Diluted Earnings Per Share

Basic and diluted earnings per share were computed using the following common share data (shares in millions):

 

     Years Ended December 31,  
     2014      2013      2012  

Number of common shares outstanding at year-end

     458.5         464.3         464.2   

Effect of using weighted average common shares outstanding

     4.1         3.4         (0.6
  

 

 

    

 

 

    

 

 

 

Weighted average basic common shares outstanding

     462.6         467.7         463.6   

Dilutive effect of equity-based compensation awards and other contingently issuable shares

     3.0         2.1         0.8   
  

 

 

    

 

 

    

 

 

 

Weighted average diluted common shares outstanding

     465.6         469.8         464.4   
  

 

 

    

 

 

    

 

 

 

Potentially issuable shares

     11.3         12.3         15.3   

Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding

     0.4         0.1         8.9