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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2016
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, 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
 
                     
Change in goodwill relating to:
                    
Purchase price finalization
  
-
   
-
   
-
   
-
   
-
 
Foreign exchange translation
  
(1.2
)
  
(1.3
)
  
-
   
-
   
(2.5
)
Total Changes
  
(1.2
)
  
(1.3
)
  
-
   
-
   
(2.5
)
                     
Balance at December 31, 2016
 
$
12.1
  
$
45.7
  
$
544.2
  
$
176.7
  
$
778.7
 
Acquired intangible assets subject to amortization
Acquired intangible assets subject to amortization as of December 31, 2016 and December 31, 2015 were as follows:

     
Weighted
Average
Useful Life
(Years)
  
December 31, 2016
  
December 31, 2015
 
      
Gross
Carrying
Amount
       
Accumulated
Amortization
      
Gross
Carrying
Amount
       
Accumulated
Amortization
 
 
 
     
(millions of dollars)
 
Tradenames
  
34
  
$
199.8
  
$
15.3
  
$
199.8
  
$
9.3
 
Technology
  
12
   
18.8
   
3.6
   
18.8
   
2.5
 
Patents and trademarks
  
17
   
6.4
   
4.8
   
6.4
   
4.4
 
Customer relationships
  
30
   
4.5
   
1.4
   
4.5
   
0.6
 
   
28
  
$
229.5
  
$
25.1
  
$
229.5
  
$
16.8