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Pension and Other Postretirement Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2013
Components Of Net Periodic Pension Cost

The components of net periodic pension cost are as follows:

 

 

     Quarter Ended
June 30,		     Six Months Ended
June 30,		  
     2013     2012     2013     2012  
(dollars in millions)                         

Service cost, net of employee contributions

    $ 7.6      $ 6.9      $ 15.1      $ 13.8   

Interest cost

      4.5        4.9        9.1        9.7   

Expected return on plan assets

      (6.5 )      (5.9 )      (13.0 )      (11.7 ) 

Amortization

      3.4        2.5        6.8        5.0   
  

 

 

    

 

 

    

 

 

    

 

 

  

Net periodic pension cost

    $ 9.0      $ 8.4      $ 18.0      $ 16.8