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Other Intangible Assets
 12 Months Ended
Dec. 31, 2014
Other Intangible Assets

8. Other Intangible Assets

Other intangible assets at December 31 consisted of:

 

     2014     2013  
     Gross
Carrying
Amount		      Accumulated
Amortization		     Gross
Carrying
Amount		      Accumulated
Amortization		  
(dollars in millions)                           

Core and developed technologies

    $ 1,082.5       $ (333.4 )    $ 968.3       $ (271.5 ) 

Customer relationships

      138.9         (58.7 )      144.6         (51.4 ) 

In-process research and development(A)

      132.9         —          270.5         —     

Other intangibles

      183.6         (91.9 )      241.8         (137.4 ) 
  

 

 

     

 

 

    

 

 

     

 

 

  
   $ 1,537.9       $ (484.0 )    $ 1,625.2       $ (460.3 ) 
  

 

 

     

 

 

    

 

 

     

 

 

  

 

(A) 

See Note 3 of the notes to consolidated financial statements for further discussion of IPR&D impairment charges.

 

Amounts capitalized as in-process research and development are accounted for as indefinite-lived intangible assets until completion or abandonment of the project. During 2014, IPR&D assets of $133.7 million related to the Lutonix acquisition were reclassified to core and developed technologies upon receipt of regulatory approval.

Amortization expense was $108.8 million, $89.5 million and $82.7 million in 2014, 2013 and 2012, respectively. The estimated amortization expense for the years 2015 through 2019 based on the company’s amortizable intangible assets as of December 31, 2014 is as follows: 2015 - $115.5 million; 2016 - $112.2 million; 2017 - $109.2 million; 2018 - $105.1 million; and 2019 - $100.8 million.