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Other Intangible Assets
 12 Months Ended
Dec. 31, 2016
Other Intangible Assets

8. Other Intangible Assets

Other intangible assets at December 31 consisted of:

 

     2016     2015  
     Gross
Carrying
Amount		      Accumulated
Amortization		     Gross
Carrying
Amount		      Accumulated
Amortization		  
(dollars in millions)                           

Core and developed technologies

    $ 1,197.7       $ (511.3 )    $ 1,161.6       $ (417.3 ) 

Customer relationships

      171.6         (53.2 )      150.1         (70.3 ) 

In-process research and development

      121.5         —          115.7         —     

Other intangibles

      190.8         (107.1 )      184.9         (105.6 ) 
  

 

 

     

 

 

    

 

 

     

 

 

  
   $ 1,681.6       $ (671.6 )    $ 1,612.3       $ (593.2 ) 
  

 

 

     

 

 

    

 

 

     

 

 

  

Amounts capitalized as IPR&D are accounted for as indefinite-lived intangible assets until completion or abandonment of the project. See Note 3 of the notes to consolidated financial statements for further discussion of IPR&D impairment charges.

Amortization expense was $130.5 million, $119.5 million and $108.8 million in 2016, 2015 and 2014, respectively. The estimated amortization expense for the years 2017 through 2021 based on the company’s amortizable intangible assets as of December 31, 2016 is as follows: 2017 - $127.6 million; 2018 - $123.6 million; 2019 - $119.2 million; 2020 - $107.0 million; and 2021 - $88.5 million.