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Pension and Other Postretirement Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2012
Components of Net Periodic Pension Cost

The components of net periodic pension cost are as follows:

 

     Quarter Ended
September  30,		     Nine Months  Ended
September 30,		  
     2012     2011     2012     2011  
(dollars in millions)                         

Service cost, net of employee contributions

    $ 7.0      $ 6.8      $ 20.8      $ 20.3   

Interest cost

      4.9        4.8        14.6        14.2   

Expected return on plan assets

      (6.2 )      (5.9 )      (17.9 )      (17.6 ) 

Amortization

      2.8        1.9        7.8        5.9   
  

 

 

    

 

 

    

 

 

    

 

 

  

Net periodic pension cost

    $ 8.5      $ 7.6      $ 25.3      $ 22.8