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Goodwill and Other Intangible Assets
9 Months Ended
Sep. 28, 2014
Goodwill and Other Intangible Assets [Abstract]  
Goodwill and Other Intangible Assets
Note 8.
Goodwill and Other Intangible Assets

Goodwill and other intangible assets with indefinite lives are not amortized, but instead are assessed for impairment, at least annually. The carrying amount of goodwill was $767.3 million, and $64.4 million as of September 28, 2014 and December 31, 2013, respectively.  The increase in goodwill is related to the acquisition of the AMCOL businesses on May 9, 2014 (as discussed in Note 2).

Acquired intangible assets subject to amortization were as follows:

 
Sept. 28, 2014
  
Dec. 31, 2013
 
 
Gross
  
  
Gross
  
 
 
Carrying
  
Accumulated
  
Carrying
  
Accumulated
 
 
 
Amount
  
Amortization
  
Amount
  
Amortization
 
 
 
(millions of dollars)
 
Tradenames
 
$
194.9
  
$
2.2
  
$
-
  
$
-
 
Technology
  
18.7
   
0.6
   
-
   
-
 
Patents and trademarks
  
6.4
   
3.9
   
6.4
   
3.7
 
Customer relationships
  
4.3
   
0.1
   
-
   
-
 
Customer lists
  
2.9
   
2.7
   
2.9
   
2.6
 
 
 
$
227.2
  
$
9.5
  
$
9.3
  
$
6.3
 
 
The amounts associated with tradenames, technology and customer relationships in the table above relate to the acquisition of the AMCOL businesses (as discussed in Note 2).
 
The weighted average amortization period for acquired intangible assets subject to amortization is approximately 33  years.  Estimated amortization expense is $5.3 million for 2014, $7.9 million for 2015–2016, $7.7 million for 2017, $7.5 million for 2018-2019, and $192.5 million thereafter.