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Goodwill and Other Intangible Assets
9 Months Ended
Sep. 27, 2015
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 $789.2 million, and $770.9 million as of September 27, 2015 and December 31, 2014, respectively.  The net change in goodwill since December 31, 2014 was attributable to the finalization of the accounting related to the acquisition of AMCOL and to the effects of foreign exchange.

Acquired intangible assets subject to amortization as of September 27, 2015 and December 31, 2014 were as follows:

   
September 27, 2015
  
December 31, 2014
 
  
Weighted Average Useful Life (Years)
  
Gross
Carrying
Amount
  
Accumulated
Amortization
  
Gross
Carrying
Amount
  
Accumulated
Amortization
 
  
  
(millions of dollars)
 
Tradenames
  
34
  
$
199.8
  
$
8.0
  
$
191.2
  
$
3.7
 
Technology
  
12
   
18.8
   
2.2
   
18.7
   
1.0
 
Patents and trademarks
  
17
   
6.4
   
4.3
   
6.4
   
4.0
 
Customer relationships
  
30
   
4.5
   
0.5
   
4.4
   
0.1
 
Customer lists
  
15
   
2.9
   
2.8
   
2.9
   
2.7
 
   
28
  
$
232.4
  
$
17.8
  
$
223.6
  
$
11.5
 

During the nine month period ended September 27, 2015, intangible assets increased approximately $8.8 million relating to the finalization of the AMCOL opening balance sheet.  The weighted average amortization period for acquired intangible assets subject to amortization is approximately 28 years.  Estimated amortization expense is $8.2 million for 2015–2016, $8.0 million for 2017, $7.8 million for 2018-2020 and $184.6 million thereafter.