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Pension and Post retirement Plans (Tables)
 3 Months Ended
Mar. 31, 2012
Pension and Post retirement Plans [Abstract]  
Components of Net Periodic Benefit Cost
The components of net periodic benefit cost recorded for the first quarters of 2012 and 2011 were as follows (in millions):

   
Pension Benefits
   
Post-retirement Benefits
 
   
2012
   
2011
   
2012
   
2011
 
                                 
Service cost
 
$
1.4
   
$
2.3
   
$
0.3
   
$
0.3
 
Interest cost
   
3.7
     
5.0
     
1.0
     
0.9
 
Expected return on plan assets
   
(3.8
)
   
(5.7
)
   
--
     
--
 
Amortization of prior service cost
   
0.2
     
0.2
     
--
     
0.5
 
Amortization of net (gain) loss
   
2.2
     
2.1
     
0.5
     
0.1
 
Net periodic benefit cost
 
$
3.7
   
$
3.9
   
$
1.8
   
$
1.8