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Pension and Postretirement Health and Life Benefits (Tables)
6 Months Ended
Jun. 30, 2012
Pension and Postretirement Health and Life Benefits  
Schedule of Net Benefit Costs
 
 
Defined Benefit Pension Plans
   
 Postretirement Health and Life Benefits Plans
 
   
Three Months Ended
June 30,
   
Six Months Ended
June 30,
   
Three Months Ended
June 30,
   
Six Months Ended
June 30,
 
   
2012
   
2011
   
2012
   
2011
   
2012
   
2011
   
2012
   
2011
 
Service costs
  $ 3.7     $ 3.2     $ 7.3     $ 8.0     $ 0.9     $ 1.4     $ 1.8     $ 2.7  
Interest costs
    12.0       12.5       24.1       25.1       2.8       3.1       5.6       6.1  
Expected return on plan assets
(gains)
    (13.0 )     (13.5 )     (26.0 )     (26.9 )     (0.7 )     (0.9 )     (1.4 )     (1.8 )
Amortization of prior service costs
    0.4       0.4       0.8       0.8       -       -       -       -  
Amortization of actuarial losses
    4.9       2.2       9.8       4.7       1.1       0.6       2.2       1.3  
Curtailment losses
    -       -       -       3.2       -       1.9       -       1.9  
Net benefit costs
  $ 8.0     $ 4.8     $ 16.0     $ 14.9     $ 4.1     $ 6.1     $ 8.2     $ 10.2