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Pension Plans (Tables)
 9 Months Ended
Sep. 30, 2017
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,		  
     2017      2016      2017      2016  
(dollars in millions)              

Service cost, net of employee contributions

    $ 6.8      $ 7.5      $ 20.1      $ 22.0  

Interest cost

      4.8        4.8        14.4        14.2  

Expected return on plan assets

      (8.3 )       (8.0 )       (24.8 )       (24.2 ) 

Amortization

      3.3        2.6        9.8        7.8  

Curtailment

      (1.7 )       —          (1.7 )       —    
  

 

 

     

 

 

     

 

 

     

 

 

  

Net periodic pension cost

    $ 4.9      $ 6.9      $ 17.8      $ 19.8