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Pension and Postretirement Health and Life Benefits (Tables)
3 Months Ended
Mar. 31, 2012
Pension and Postretirement Health and Life Benefits  
Schedule of Net Benefit Costs
   
Defined Benefit Pension Plans
   
Postretirement Health and Life Benefit Plans
 
   
Three Months Ended March 31,
   
Three Months Ended March 31,
 
   
2012
   
2011
   
2012
   
2011
 
Service costs             
  $ 3.6     $ 4.8     $ 0.9     $ 1.3  
Interest costs              
    12.1       12.6       2.8       3.0  
Expected returns on plan assets (gains)            
    (13.0 )     (13.4 )     (0.7 )     (0.9 )
Amortization of prior service costs (credit)   
    0.4       0.4       -       -  
Amortization of actuarial losses     
    4.9       2.5       1.1       0.7  
Curtailment loss       
    -       3.2       -       -  
Net benefit costs        
  $ 8.0     $ 10.1     $ 4.1     $ 4.1