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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2014
Goodwill and Other Intangible Assets [Abstract]  
Carrying amount of goodwill by reportable segment
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, 2012
 
$
14.1
  
$
51.7
  
$
-
  
$
-
  
$
65.8
 
                     
Change in goodwill relating to:
                    
Foreign exchange translation
  
0.2
   
(1.6
)
  
-
   
-
   
(1.4
)
Total Changes
 
$
0.2
  
$
(1.6
)
 
$
-
  
$
-
  
$
(1.4
)
                     
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
 
Acquired intangible assets subject to amortization
Acquired intangible assets subject to amortization as of December 31, 2014 and December 31, 2013 were as follows:

  
Weighted
  
December 31, 2014
  
December 31, 2013
 
  
Average Useful Life (Years)
  
Gross Carrying Amount
  
Accumulated Amortization
  
Gross Carrying Amount
  
Accumulated Amortization
 
    
(millions of dollars)
 
Tradenames
  
34
  
$
191.2
  
$
3.7
  
$
-
  
$
-
 
Technology
  
12
   
18.7
   
1.0
   
-
   
-
 
Patents and trademarks
  
17
   
6.4
   
4.0
   
6.4
   
3.7
 
Customer relationships
  
30
   
4.4
   
0.1
   
-
   
-
 
Customer lists
  
15
   
2.9
   
2.7
   
2.9
   
2.6
 
Total
  
28
  
$
223.6
  
$
11.5
  
$
9.3
  
$
6.3