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Earnings Per Share (EPS)
 12 Months Ended
Dec. 31, 2016
Earnings Per Share (EPS) [Abstract]  
Earnings Per Share (EPS)
Note 5.
Earnings Per Share (EPS)

      
Year Ended December 31,
 
2016
  
2015
  
2014
 
(in millions, except per share data)
 
Basic EPS
         
Amounts attributable to MTI
         
Income from continuing operations
 
$
133.4
  
$
107.9
  
$
90.3
 
Income from discontinued operations
  
-
   
-
   
2.1
 
Net income
 
$
133.4
  
$
107.9
  
$
92.4
 
             
Weighted average shares outstanding
  
34.9
   
34.7
   
34.5
 
             
Earnings per share attributable to MTI
            
Continuing operations
 
$
3.82
  
$
3.11
  
$
2.62
 
Discontinued operations
  
-
   
-
   
0.06
 
Net income
 
$
3.82
  
$
3.11
  
$
2.68
 
             
Diluted EPS
            
Amounts attributable to MTI
            
Income from continuing operations
 
$
133.4
  
$
107.9
  
$
90.3
 
Income from discontinued operations
  
-
   
-
   
2.1
 
Net income
 
$
133.4
  
$
107.9
  
$
92.4
 
             
Weighted average shares outstanding
  
34.9
   
34.7
   
34.5
 
Dilutive effect of stock options and stock units
  
0.3
   
0.3
   
0.3
 
Weighted average shares outstanding, adjusted
  
35.2
   
35.0
   
34.8
 
             
Earnings per share attributable to MTI
            
Continuing operations
 
$
3.79
  
$
3.08
  
$
2.59
 
Discontinued operations
  
-
   
-
   
0.06
 
Net income
 
$
3.79
  
$
3.08
  
$
2.65
 

Options to purchase 784 shares, 386,766 shares and 12,888 shares of common stock for the years ended December 31, 2016, 2015 and 2014, respectively, were not included in the computation of diluted earnings per share because they were anti-dilutive, as the exercise prices of the options were greater than the average market price of the common shares.