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EARNINGS PER SHARE
 6 Months Ended
Jun. 30, 2011
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
June 30,
   
Six Months Ended
June 30,
 
   
2011
   
2010
   
2011
   
2010
 
Computation of Income per Share
 
($ and shares in millions, except per share data)
   
($ and shares in millions, except per share data)
 
Net income
 
$
42.1
   
$
16.9
   
$
175.8
   
$
31.0
 
Basic shares
   
80.0
     
79.0
     
79.8
     
78.9
 
Basic net income per share
 
$
0.53
   
$
0.21
   
$
2.20
   
$
0.39
 
                                 
Diluted shares:
                               
Basic shares
   
80.0
     
79.0
     
79.8
     
78.9
 
Stock-based compensation
   
1.1
     
0.8
     
0.9
     
0.7
 
Diluted shares
   
81.1
     
79.8
     
80.7
     
79.6
 
Diluted net income per share
 
$
0.52
   
$
0.21
   
$
2.18
   
$
0.39
 

For the three months ended June 30, 2011, no shares were anti-dilutive to the computation of dilutive shares from stock-based compensation.  The computation of dilutive shares from stock-based compensation does not include 0.6 million shares for the three months ended June 30, 2010, and 0.1 million and 0.7 million shares for the six months ended June 30, 2011 and 2010, respectively, as their effect would have been anti-dilutive.