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EARNINGS PER SHARE
 3 Months Ended
Mar. 31, 2012
EARNINGS PER SHARE [Abstract]  
EARNINGS PER SHARE

EARNINGS PER SHARE

Basic and diluted net income per share are computed by dividing net income by the weighted average number of common shares outstanding.  Diluted net income per share reflects the dilutive effect of stock-based compensation.

   
Three Months Ended
March 31,
 
   
2012
   
2011
 
Computation of Income per Share
 
($ and shares in millions, except per share data)
 
Net income
 
$
38.7
   
$
133.7
 
Basic shares
   
80.1
     
79.6
 
Basic net income per share
 
$
0.48
   
$
1.68
 
                 
Diluted shares:
               
Basic shares
   
80.1
     
79.6
 
Stock-based compensation
   
0.8
     
0.8
 
Diluted shares
   
80.9
     
80.4
 
Diluted net income per share
 
$
0.48
   
$
1.66
 

The computation of dilutive shares from stock-based compensation does not include 0.8 million shares and 1.3 million shares for the three months ended March 31, 2012 and 2011, respectively, as their effect would have been anti-dilutive.