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Pension Plans (Tables)
 6 Months Ended
Jun. 30, 2015
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,		  
     2015      2014      2015      2014  
(dollars in millions)              

Service cost, net of employee contributions

    $ 7.5       $ 6.8       $ 15.0       $ 13.5   

Interest cost

      4.9         5.2         9.9         10.5   

Expected return on plan assets

      (7.8 )       (6.8 )       (15.6 )       (13.6 ) 

Amortization

      2.9         2.5         5.8         4.9   
  

 

 

     

 

 

     

 

 

     

 

 

  

Net periodic pension cost

 $ 7.5    $ 7.7    $ 15.1    $ 15.3