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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2013
Computations of Weighted Average Shares Outstanding

The computations of the weighted average shares outstanding for the three months ended March 31, 2013 and 2012 are as follows:

 

     Three months ended
March  31,		  

(in millions)

    2013      2012  

Weighted average shares outstanding:

      

Basic

      111.1         127.3   

Dilutive share-based awards (1)

      —           0.9   
  

 

 

     

 

 

  

Diluted

      111.1         128.2   
  

 

 

     

 

 

  

 

(1) The three months ended March 31, 2013 excludes 0.8 million potentially dilutive share-based awards as their effect would be antidilutive.