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Comprehensive Income
6 Months Ended
Jun. 30, 2011
Comprehensive Income [Abstract]  
Comprehensive Income
(6)
Comprehensive income for the three and six months ended June 30, 2011 and 2010 consisted of (in millions):

   
Quarter Ended
   
Six Months Ended
 
   
June 30,
   
June 30,
 
   
2011
   
2010
   
2011
   
2010
 
                                 
Net income
 
$
18.7
   
$
28.9
   
$
23.9
   
$
46.2
 
Amortization of unrealized pension asset loss
   
0.7
     
2.6
     
2.2
     
4.4
 
Other
   
0.1
     
0.1
     
0.1
     
0.1
 
Comprehensive income
 
$
19.5
   
$
31.6
   
$
26.2
   
$
50.7