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Pension Plans (Tables)
 6 Months Ended
Jun. 30, 2017
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,		  
     2017      2016      2017      2016  
(dollars in millions)              

Service cost, net of employee contributions

    $ 6.7      $ 7.2      $ 13.3      $ 14.5  

Interest cost

      4.8        4.7        9.6        9.4  

Expected return on plan assets

      (8.2 )       (8.1 )       (16.5 )       (16.2 ) 

Amortization

      3.2        2.6        6.5        5.2  
  

 

 

     

 

 

     

 

 

     

 

 

  

Net periodic pension cost

    $ 6.5      $ 6.4      $ 12.9      $ 12.9