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EARNINGS PER SHARE
 12 Months Ended
Dec. 31, 2011
Net income per common share [Abstract]  
EARNINGS PER SHARE
EARNINGS PER SHARE

Basic and diluted 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.

   
Years ended December 31,
 
Computation of Income per Share
 
2011
   
2010
   
2009
 
   
(In millions, except per share data)
 
Net income
 
$
241.7
   
$
64.8
   
$
135.7
 
Basic shares:
   
80.0
     
79.2
     
78.1
 
Basic net income per share
 
$
3.02
   
$
0.82
   
$
1.74
 
Diluted shares:
                       
Basic shares
   
80.0
     
79.2
     
78.1
 
Stock-based compensation
   
0.8
     
0.7
     
0.2
 
Diluted shares
   
80.8
     
79.9
     
78.3
 
Diluted net income per share
 
$
2.99
   
$
0.81
   
$
1.73
 

The computation of dilutive shares from stock-based compensation does not include 0.9 million, 1.3 million and 3.2 million shares in 2011, 2010 and 2009, respectively, as their effect would have been anti-dilutive.