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Other Intangible Assets
 12 Months Ended
Dec. 31, 2011
Other Intangible Assets [Abstract]  
Other Intangible Assets

8. Other Intangible Assets

Other intangible assets at December 31 consisted of:

 

     2011     2010  
     Gross
Carrying
Amount		      Accumulated
Amortization		     Gross
Carrying
Amount		      Accumulated
Amortization		  

(dollars in millions)

           

Core technologies

    $ 660.2       $ (161.5 )    $ 515.8       $ (118.3 ) 

Customer relationships

      144.6         (25.7 )      43.8         (19.7 ) 

In-process research and development(A)

     136.2         —          21.9         —     

Other intangibles

      202.6         (105.1 )      187.7         (90.9 ) 
  

 

 

     

 

 

    

 

 

     

 

 

  
   $ 1,143.6       $ (292.3 )    $ 769.2       $ (228.9 ) 
  

 

 

     

 

 

    

 

 

     

 

 

  

(A) 

Amounts capitalized as in-process research and development are accounted for as indefinite-lived intangible assets.

Amortization expense was $63.3 million, $53.1 million and $42.5 million in 2011, 2010 and 2009, respectively. The estimated amortization expense for the years 2012 through 2016 based on the company's amortizable intangible assets as of December 31, 2011 is as follows: 2012 - $83.1 million; 2013 - $83.0 million; 2014 - $80.2 million; 2015 - $77.7 million; and 2016 - $74.3 million.