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Earnings Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2011
Earnings Per Common Share [Abstract]  
Earnings Per Share Computation
     2011      2010      2009  
(dollars and shares in millions)                     

EPS Numerator:

         

Net income attributable to common shareholders

    $ 328.0       $ 509.2       $ 460.1   

Less: Income allocated to participating securities

      6.1         5.5         5.0   
  

 

 

     

 

 

     

 

 

  

Net income available to common shareholders

    $ 321.9       $ 503.7       $ 455.1   
  

 

 

     

 

 

     

 

 

  

EPS Denominator:

         

Weighted average common shares outstanding

      85.8         93.4         97.7   

Dilutive common share equivalents from share-based compensation plans

      1.5         1.2         1.3   
  

 

 

     

 

 

     

 

 

  

Weighted average common and common equivalent shares outstanding, assuming dilution

      87.3         94.6         99.0