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Quarterly Financial Data (unaudited)
 12 Months Ended
Dec. 31, 2014
Quarterly Financial Data (unaudited) [Abstract]  
Quarterly Financial Data (unaudited)
Note 23.  Quarterly Financial Data (unaudited)

  
2014 quarters
 
  
First
  
Second
  
Third
  
Fourth
 
  
(millions of dollars, except per share amounts)
 
         
Net sales by segment
        
Specialty Minerals segment
 
$
159.7
  
$
167.8
  
$
163.0
  
$
159.6
 
Refractories segment
  
84.7
   
91.7
   
90.4
   
92.9
 
Performance materials segment
  
-
   
75.8
   
135.6
   
141.4
 
Construction Technologies segment
  
-
   
37.2
   
69.1
   
46.0
 
Energy Services segment
  
-
   
48.6
   
85.4
   
76.1
 
Net sales
  
244.4
   
421.1
   
543.5
   
516.0
 
                 
Gross profit
  
55.3
   
102.7
   
145.0
   
132.4
 
                 
Income from operations
  
23.6
   
35.8
   
66.8
   
42.6
 
                 
Income from continuing operations
  
16.3
   
17.6
   
37.6
   
21.9
 
Income (loss) from discontinued operations
  
-
   
1.8
   
0.2
   
0.1
 
Net income attributable to MTI
  
15.6
   
18.5
   
37.0
   
21.3
 
                 
Basic earnings per share attributable to MTI shareholders:
                
Income from continuting operations
 
$
0.45
  
$
0.48
  
$
1.07
  
$
0.61
 
Loss from discontinued operations
  
-
   
0.05
   
-
   
0.01
 
Net income
 
$
0.45
  
$
0.53
  
$
1.07
  
$
0.62
 
                 
Diluted earnings per share attributable to MTI shareholders:
                
Income from continuting operations
 
$
0.45
  
$
0.48
  
$
1.06
  
$
0.61
 
Loss from discontinued operations
  
-
   
0.05
   
-
   
-
 
Net income
 
$
0.45
  
$
0.53
  
$
1.06
  
$
0.61
 
                 
Market price range per share of common stock:
                
High
 
$
64.48
  
$
66.50
  
$
67.02
  
$
77.40
 
Low
 
$
48.81
  
$
59.49
  
$
57.14
  
$
58.06
 
Close
 
$
63.57
  
$
65.01
  
$
63.45
  
$
69.45
 
                 
Dividends paid per common share
 
$
0.05
  
$
0.05
  
$
0.05
  
$
0.05
 
 
 
  
2013 quarters
 
  
First
  
Second
  
Third
  
Fourth
 
  
(millions of dollars, except per share amounts)
 
         
Net sales by segment
        
Specialty Minerals segment
 
$
166.8
  
$
168.3
  
$
167.4
  
$
167.3
 
Refractories segment
  
83.6
   
88.5
   
86.8
   
89.5
 
Net sales
  
250.4
   
256.8
   
254.2
   
256.8
 
                 
Gross profit
  
56.0
   
58.8
   
59.9
   
59.0
 
                 
Income from operations
  
28.2
   
32.4
   
32.8
   
33.5
 
                 
Income from continuing operations
  
20.3
   
22.7
   
22.6
   
23.6
 
Income (loss) from discontinued operations
  
(0.7
)
  
(5.1
)
  
-
   
-
 
                 
Net income attributable to MTI
  
18.7
   
17.1
   
21.9
   
22.6
 
                 
Basic earnings per share attributable to MTI shareholders:
                
Income from continuting operations
 
$
0.56
  
$
0.63
  
$
0.63
  
$
0.66
 
Loss from discontinued operations
  
(0.02
)
  
(0.14
)
  
-
   
-
 
Net income
 
$
0.54
  
$
0.49
  
$
0.63
  
$
0.66
 
                 
Diluted earnings per share attributable to MTI shareholders:
                
Income from continuting operations
 
$
0.55
  
$
0.63
  
$
0.63
  
$
0.65
 
Loss from discontinued operations
  
(0.02
)
  
(0.14
)
  
-
   
-
 
Net income
 
$
0.53
  
$
0.49
  
$
0.63
  
$
0.65
 
                 
Market price range per share of common stock:
                
High
 
$
43.04
  
$
43.12
  
$
49.03
  
$
60.40
 
Low
 
$
39.54
  
$
38.43
  
$
42.53
  
$
49.28
 
Close
 
$
41.51
  
$
41.34
  
$
48.95
  
$
60.07
 
                 
Dividends paid per common share
 
$
0.05
  
$
0.05
  
$
0.05
  
$
0.05