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Goodwill and Other Intangible Assets
6 Months Ended
Jun. 28, 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 $781.7 million, and $770.9 million as of June 28, 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 June 28, 2015 and December 31, 2014 were as follows:

 
Weighted
Average
Useful Life
(Years)
  
June 28, 2015
  
December 31, 2014
 
    
Gross
Carrying
Amount
  
Accumulated
Amortization
  
Gross
Carrying
Amount
  
Accumulated
Amortization
 
    
(millions of dollars)
 
Tradenames
  
34
  
$
199.8
  
$
6.4
  
$
191.2
  
$
3.7
 
Technology
  
12
   
18.8
   
1.8
   
18.7
   
1.0
 
Patents and trademarks
  
17
   
6.4
   
4.2
   
6.4
   
4.0
 
Customer relationships
  
30
   
4.5
   
0.2
   
4.4
   
0.1
 
Customer lists
  
15
   
2.9
   
2.8
   
2.9
   
2.7
 
   
28
  
$
232.4
  
$
15.4
  
$
223.6
  
$
11.5
 

During the six month period ended June 28, 2015, intangibles increased approximately $8.8 million relating to the finalization of the 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.