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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2017
Schedule of Changes in Carrying Amount of Goodwill

Changes in the carrying amount of goodwill during the years ended December 31, 2017 and 2016 consisted of the following:

 

(dollars in millions)

    North America      Rest of World      Total  

Balance at December 31, 2015

    $ 361.0      $ 59.9      $ 420.9  

Acquisitions

      70.0        —          70.0  

Currency translation adjustment

      1.2        (0.6 )       0.6  
  

 

 

     

 

 

     

 

 

  

Balance at December 31, 2016

      432.2        59.3        491.5  

Acquisitions

      22.2        —          22.2  

Currency translation adjustment

      2.8        0.2        3.0  
  

 

 

     

 

 

     

 

 

  

Balance at December 31, 2017

    $ 457.2      $ 59.5      $ 516.7  
  

 

 

     

 

 

     

 

 

  
Schedule of Carrying Amount of Other Intangible Assets

The carrying amount of other intangible assets consisted of the following:

 

     2017      2016  

December 31 (dollars in millions)

    Gross
Carrying
Amount		      Accumulated
Amortization		     Net      Gross
Carrying
Amount		      Accumulated
Amortization		     Net  

Amortizable intangible assets:

                

Patents

    $ 3.7      $ (2.7 )    $ 1.0      $ 3.7      $ (2.2 )    $ 1.5  

Customer lists

      235.8        (93.3 )      142.5        224.0        (80.3 )      143.7  
  

 

 

     

 

 

    

 

 

     

 

 

     

 

 

    

 

 

  

Total amortizable intangible assets

      239.5        (96.0 )      143.5        227.7        (82.5 )      145.2  

Indefinite-lived intangible assets:

                

Trade names

      165.2        —         165.2        163.1        —         163.1  
  

 

 

     

 

 

    

 

 

     

 

 

     

 

 

    

 

 

  

Total intangible assets

    $ 404.7      $ (96.0 )    $ 308.7      $ 390.8      $ (82.5 )    $ 308.3