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Pension and Other Post-Retirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2012
Pension and Other Post-Retirement Benefits [Abstract]  
Components of pension and other post retirement benefit costs
                                 
    2012 Pension
Benefits		     2011 Pension
Benefits		     2012 Retiree
Health and
Life		     2011 Retiree
Health and
Life		  

Service cost

   $ 1.5     $ 1.5     $ 0.1     $ —    

Interest cost

     4.9       5.2       0.5       0.5  

Expected return on plan assets

     (7.4 )      (8.3 )      —         —    

Amortization of:

                                

Unrecognized prior service credit

     (0.3 )      (0.3 )      —         —    

Unrecognized net actuarial loss (gains)

     2.5       2.0       —         —    
   

 

 

    

 

 

    

 

 

    

 

 

  

Net costs (a)

   $ 1.2     $ 0.1     $ 0.6     $ 0.5  
   

 

 

    

 

 

    

 

 

    

 

 

  

 

(a) The amounts reported herein are based on estimated annual costs. Actual annual costs for the year ending December 31, 2012, may differ from these estimates.