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Quarterly Financial Data (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Data
Millions of Dollars, Except Per Share Amounts

2011 Quarters
   
First
     
Second
     
Third
     
Fourth
 
Net Sales by Major Product Line
                               
 
PCC                                                        
 
$
144.8
   
$
140.2
   
$
142.5
   
$
133.1
 
 
Processed Minerals                                                        
   
28.5
     
31.6
     
28.6
     
26.8
 
 
Specialty Minerals Segment
   
173.3
     
171.8
     
171.1
     
159.9
 
 
Refractories Segment
   
89.2
     
96.6
     
91.1
     
91.8
 
                                 
Net sales                                                           
   
262.5
     
268.4
     
262.2
     
251.7
 
Gross profit                                                           
   
52.9
     
53.7
     
52.9
     
52.7
 
                                 
Income from operations                                                           
   
24.7
     
25.1
     
25.4
     
25.2
 
Consolidated net income                                                           
   
16.7
     
17.2
     
16.3
     
20.1
 
Non-controlling Interests                                                           
   
(0.9
)
   
(0.7
)
   
(0.7
)
   
(0.4
)
 
Net income attributable to MTI
 
$
15.8
   
$
16.4
   
$
15.7
   
$
19.6
 
Earnings per share:
                               
Basic
 
$
0.86
   
$
0.90
   
$
0.88
     
1.11
 
Diluted
 
$
0.86
   
$
0.90
   
$
0.87
     
1.11
 

Market price range per share of common stock:
                               
 
High
 
$
68.73
   
$
70.09
   
$
68.63
   
$
58.00
 
 
Low
 
$
62.46
   
$
63.01
   
$
49.27
   
$
46.75
 
 
Close
 
$
68.73
   
$
67.66
   
$
49.27
   
$
56.53
 
                                 
Dividends paid per common share
 
$
0.05
   
$
0.05
   
$
0.05
   
$
0.05
 


2010 Quarters
   
First
     
Second
     
Third
     
Fourth
 
                                 
Net Sales by Major Product Line
                               
 
PCC                                                        
 
$
145.1
   
$
138.4
   
$
136.8
   
$
134.3
 
 
Processed Minerals                                                        
   
27.0
     
29.8
     
29.3
     
24.3
 
 
Specialty Minerals Segment
   
172.1
     
168.2
     
166.1
     
158.6
 
 
Refractories Segment
   
81.4
     
87.6
     
83.7
     
84.7
 
                                 
Net sales                                                           
   
253.5
     
255.8
     
249.8
     
243.3
 
                                 
Gross profit                                                           
   
51.4
     
55.0
     
52.2
     
50.6
 
                                 
Income from operations                                                           
   
23.1
     
27.5
     
25.0
     
22.8
 
Consolidated net income                                                           
   
16.1
     
19.6
     
17.5
     
16.7
 
Non-controlling interests                                                           
   
(0.7
)
   
(0.7
)
   
(0.8
)
   
(0.8
)
 
Net income attributable to MTI...
 
$
         15.4
   
$
19.0
   
$
16.7
   
$
15.8
 
                                 
Earnings per share:
                               
Basic                                                      
 
$
0.82
   
$
1.01
   
$
0.90
   
$
0.86
 
Diluted                                                       
 
$
0.82
   
$
1.01
   
$
0.90
   
$
0.86
 

Market price range per share of common stock:
                               
 
High
 
$
56.05
   
$
59.53
   
$
59.68
   
$
66.81
 
 
Low
 
$
46.36
   
$
46.90
   
$
45.73
   
$
56.43
 
 
Close
 
$
52.30
   
$
46.90
   
$
58.65
   
$
65.41
 
                                 
Dividends paid per common share                                                           
 
$
0.05
   
$
0.05
   
$
0.05
   
$
0.05