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Quarterly Financial Data (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Data (unaudited) [Abstract]  
Quarterly Financial Data
 
2017 quarters
 
  
First
  
Second
  
Third
  
Fourth
 
  
(millions of dollars, except per share amounts)
 
             
Net sales by segment
            
Specialty Minerals segment
 
$
146.2
  
$
147.0
  
$
147.7
  
$
143.9
 
Performance Materials segment
  
169.9
   
180.3
   
188.8
  
$
195.8
 
Refractories segment
  
70.2
   
68.9
   
69.0
  
$
71.3
 
Energy Services segment
  
18.7
   
17.9
   
19.0
  
$
21.1
 
Net sales
  
405.0
   
414.1
   
424.5
   
432.1
 
                 
Gross profit
  
113.7
   
119.7
   
119.3
   
114.5
 
                 
Income from operations
  
61.7
   
68.5
   
66.8
   
45.7
 
                 
Consolidated net income
  
35.6
   
43.8
   
42.8
   
76.7
 
                 
Net income attributable to Minerals Technologies Inc. (MTI)
  
34.6
   
43.0
   
41.7
   
75.8
 
                 
Basic earnings per share attributable to MTI shareholders
 
$
0.99
  
$
1.23
  
$
1.18
  
$
2.14
 
                 
Diluted earnings per share attributable to MTI shareholders
 
$
0.97
  
$
1.21
  
$
1.17
  
$
2.12
 
                 
Market price range per share of common stock:
                
High
 
$
83.70
  
$
80.20
  
$
75.60
  
$
73.55
 
Low
 
$
72.20
  
$
70.50
  
$
62.95
  
$
66.40
 
Close
 
$
76.60
  
$
73.20
  
$
70.65
  
$
68.85
 
                 
Dividends paid per common share
 
$
0.05
  
$
0.05
  
$
0.05
  
$
0.05
 
 
 
2016 quarters
 
 
 
First
  
Second
  
Third
  
Fourth
 
 
 
(millions of dollars, except per share amounts)
 
 
            
Net sales by segment
            
Specialty Minerals segment
 
$
155.6
  
$
150.6
  
$
147.3
  
$
138.0
 
Performance Materials segment
  
159.6
   
182.5
   
169.0
   
175.0
 
Refractories segment
  
69.2
   
73.9
   
63.4
   
68.0
 
Energy Services segment
  
25.8
   
20.0
   
19.8
   
20.3
 
Net sales
  
410.2
   
427.0
   
399.5
   
401.3
 
 
                
Gross profit
  
112.7
   
121.1
   
115.2
   
111.4
 
 
                
Income from operations
  
57.6
   
39.5
   
67.3
   
56.5
 
 
                
Consolidated net income
  
34.8
   
22.3
   
42.5
   
37.5
 
 
                
Net income attributable to MTI
  
33.9
   
21.2
   
41.6
   
36.7
 
 
                
Basic earnings per share attributable to MTI shareholders
 
$
0.97
  
$
0.61
  
$
1.19
  
$
1.05
 
 
                
Diluted earnings per share attributable to MTI shareholders
 
$
0.97
  
$
0.60
  
$
1.18
  
$
1.04
 
 
                
Market price range per share of common stock:
                
High
 
$
57.12
  
$
61.66
  
$
72.51
  
$
82.90
 
Low
 
$
37.03
  
$
52.53
  
$
56.00
  
$
66.10
 
Close
 
$
57.12
  
$
57.38
  
$
70.69
  
$
77.25
 
 
                
Dividends paid per common share
 
$
0.05
  
$
0.05
  
$
0.05
  
$
0.05