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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2011
Notes to Financial Statements [Abstract]  
Calculation of basic and diluted earnings per share
The calculation of basic and diluted earnings per share for each period presented was as follows (dollars and shares in millions, except per share amounts):

   
Three Months Ended
June 30,
  
Six Months Ended
June 30,
 
   
2011
  
2010
  
2011
  
2010
 
Net income
 $148.0  $129.2  $257.6  $249.6 
                  
Average shares outstanding (basic)
  245.0   242.9   244.8   243.6 
Common stock equivalents
  1.9   2.2   2.2   2.4 
Incremental shares from assumed conversion of convertible debentures
  3.0   1.3   4.1   1.7 
Diluted shares
  249.9   246.4   251.1   247.7 
                  
Basic earnings per share
 $0.60  $0.53  $1.05  $1.02 
Diluted earnings per share
 $0.59  $0.52  $1.03  $1.01