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Goodwill and Other Intangible Assets
12 Months Ended
Dec. 31, 2015
Goodwill and Other Intangible Assets [Abstract]  
Goodwill and Other Intangible Assets
Note 10.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 $781.2 million, and $770.9 million as of December 31, 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.

The balance of goodwill by segment and the activity occurring in the past two fiscal years is as follows:

  
Specialty
Minerals
  
 
Refractories
  
Performance
Materials
  
Construction
Technologies
  
 
Consolidated
 
 
 
(millions of dollars)
 
Balance at December 31, 2013
 
$
14.3
  
$
50.1
  
$
-
  
$
-
  
$
64.4
 
 
                    
Change in goodwill relating to:
                    
Acquisition
          
453.2
   
255.0
   
708.2
 
Foreign exchange translation
  
(0.6
)
  
(1.1
)
  
-
   
-
   
(1.7
)
Total Changes
 
$
(0.6
)
 
$
(1.1
)
 
$
453.2
  
$
255.0
  
$
706.5
 
 
                    
Balance at December 31, 2014
 
$
13.7
  
$
49.0
  
$
453.2
  
$
255.0
  
$
770.9
 
 
                    
Change in goodwill relating to:
                    
Purchase price finalization
  
-
   
-
   
91.1
   
(78.3
)
  
12.8
 
Foreign exchange translation
  
(0.4
)
  
(2.0
)
  
(0.1
)
  
-
   
(2.5
)
Total Changes
  
(0.4
)
  
(2.0
)
  
91.0
   
(78.3
)
  
10.3
 
 
                    
Balance at December 31, 2015
 
$
13.3
  
$
47.0
  
$
544.2
  
$
176.7
  
$
781.2
 
 
Acquired intangible assets subject to amortization as of December 31, 2015 and December 31, 2014 were as follows:

   
December 31, 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
  
$
9.3
  
$
191.2
  
$
3.7
 
Technology
  
12
   
18.8
   
2.5
   
18.7
   
1.0
 
Patents and trademarks
  
17
   
6.4
   
4.4
   
6.4
   
4.0
 
Customer relationships
  
30
   
4.5
   
0.6
   
4.4
   
0.1
 
Customer lists
  
15
   
2.9
   
2.9
   
2.9
   
2.7
 
   
28
  
$
232.4
  
$
19.7
  
$
223.6
  
$
11.5
 

In 2014, intangible assets increased approximately $8.8 million relating to the finalization of the AMCOL opening balance sheet.  The weighted average amortization period of the acquired intangible assets subject to amortization is approximately 28 years.  Amortization expense was approximately $7.9 million, $4.6 million and $0.6 million for the years ended December 31, 2015, 2014 and 2013, respectively and is recorded within Marketing and administrative expenses and Amortization expense of intangible assets acquired lines within Consolidated Statements of Income.  The estimated amortization expense is $8.1 million in 2015, $7.9 million for 2017-2020, and $172.9 million thereafter.