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Earnings Per Share (EPS)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share (EPS) [Abstract]  
Earnings Per Share (EPS)
Note 6.  Earnings Per Share (EPS)

  
Year Ended December 31,
 
(in millions, except per share data)
 
2018
  
2017
  
2016
 
Net income attributable to MTI
 
$
169.0
  
$
195.1
  
$
133.4
 
             
             
Weighted average shares outstanding
  
35.3
   
35.2
   
34.9
 
Dilutive effect of stock options and stock units
  
0.3
   
0.4
   
0.3
 
Weighted average shares outstanding, adjusted
  
35.6
   
35.6
   
35.2
 
             
Basic earnings per share attributable to MTI
 
$
4.79
  
$
5.54
  
$
3.82
 
             
Diluted earnings per share attributable to MTI
 
$
4.75
  
$
5.48
  
$
3.79
 

Options to purchase 568,284 shares, 181,003 shares and 784 shares of common stock for the years ended December 31, 2018, 2017 and 2016, 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.