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Retirement Plans (Tables)
 3 Months Ended
Mar. 31, 2012
Compensation and Retirement Disclosure [Abstract]  
Retirement Plans
The components of the net periodic benefit cost for our plans were as follows:

   
3 Months Ended March 31,
 
   
Defined Benefit
   
Retiree Health
 
   
Pension Plans
   
Care Plan
 
   
2012
   
2011
   
2012
   
2011
 
Service cost
 
$
2.6
   
$
2.6
   
$
-
   
$
0.1
 
Interest cost
   
3.7
     
3.9
     
0.3
     
0.3
 
Expected return on assets
   
(3.6
)
   
(3.8
)
   
-
     
-
 
Other
   
0.4
     
0.1
     
-
     
-
 
 Net periodic benefit cost
 
$
3.1
   
$
2.8
   
$
0.3
   
$
0.4