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Property, Plant and Equipment (Tables)
12 Months Ended
Dec. 31, 2017
Schedule of Property Plant and Equipment

December 31 (dollars in millions)

   2017      2016  

Land

   $ 11.2      $ 11.0  

Buildings

     329.9        286.4  

Equipment

     608.4        533.7  

Software

     110.6        101.4  
  

 

 

    

 

 

 
     1,060.1        932.5  

Less accumulated depreciation and amortization

     531.2        470.6  
  

 

 

    

 

 

 
   $ 528.9      $ 461.9