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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2013
Earnings per share [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
March 31,
 
 
2013
 
 
2012
 
 
 
 
 
 
 
Net income
 
$
148.3
 
 
$
134.0
 
 
 
 
 
 
 
 
 
Average shares outstanding (basic)
 
 
247.5
 
 
 
246.1
 
Common stock equivalents
 
 
1.5
 
 
 
1.8
 
Diluted shares
 
 
249.0
 
 
 
247.9
 
 
 
 
 
 
 
 
 
Basic earnings per share
 
$
0.60
 
 
$
0.54
 
Diluted earnings per share
 
$
0.60
 
 
$
0.54