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Earnings Per Common Share (Tables)
 3 Months Ended
Mar. 31, 2012
Earnings Per Common Share [Abstract]  
Earnings Per Share Computation
    
Three Months
Ended
March 31,		  
     2012      2011  
(dollars and shares in millions)              

EPS Numerator:

      

Net income

    $ 138.7       $ 131.9   

Less: Income allocated to participating securities

      2.7         2.6   
  

 

 

     

 

 

  

Net income available to common shareholders

    $ 136.0       $ 129.3   
  

 

 

     

 

 

  

EPS Denominator:

      

Weighted average common shares outstanding

      84.1         85.3   

Dilutive common share equivalents from share-based compensation plans

      1.0         1.7   
  

 

 

     

 

 

  

Weighted average common and common equivalent shares outstanding, assuming dilution

      85.1         87.0