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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2012
Defined Benefit Plans [Member]
  
Defined Benefit Plan Disclosure [Line Items]  
Components of Net Periodic Benefit Cost

Defined benefit plans – The components of net periodic defined benefit pension cost are presented in the table below.

 

                                 
    Three months ended
June 30,		     Six months ended
June  30,		  
    2011     2012     2011     2012  
    (In millions)  

Service cost

   $ 2.8     $ 2.6     $ 5.5     $ 5.2  

Interest cost

     6.3       5.8       12.2       11.6  

Expected return on plan assets

     (4.9 )      (4.6 )      (9.5 )      (9.2 ) 

Amortization of prior service cost

     .4       .4       .8       .8  

Amortization of net transition obligations

     .1       .1       .2       .2  

Recognized actuarial losses

     1.7       2.0       3.3       4.0  
   

 

 

    

 

 

    

 

 

    

 

 

  
         

Total

   $ 6.4     $ 6.3     $ 12.5     $ 12.6  
   

 

 

    

 

 

    

 

 

    

 

 

  
Postretirement Benefits [Member]
  
Defined Benefit Plan Disclosure [Line Items]  
Components of Net Periodic Benefit Cost

Postretirement benefits – The components of net periodic postretirement benefits other than pension (OPEB) cost are presented in the table below.

 

                                 
    Three months ended
June  30,		     Six months ended
June  30,		  
    2011     2012     2011     2012  
    (In millions)  

Service cost

   $ —       $ —       $ .1     $ .1  

Interest cost

     .2       .2       .3       .3  

Amortization of prior service credit

     (.2 )      (.1 )      (.4 )      (.3 ) 

Recognized actuarial loss

     —         .1       .1       .2  
   

 

 

    

 

 

    

 

 

    

 

 

  
         

Total

   $ —       $ .2     $ .1     $ .3