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Earnings Per Share
 12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Earnings Per Share

Note 8.  Earnings Per Share (EPS)

  
Year Ended December 31,
  
(in millions, except per share data)
  
2020
    
2019
    
2018
  
Net income attributable to MTI
  
$
112.4
    
$
132.7
    
$
169.0
  
                         
                         
Weighted average shares outstanding
    
34.2
      
35.0
      
35.3
  
Dilutive effect of stock options and stock units
    
—
      
0.1
      
0.3
  
Weighted average shares outstanding, adjusted
    
34.2
      
35.1
      
35.6
  
                         
Basic earnings per share attributable to MTI
  
$
3.29
    
$
3.79
    
$
4.79
  
                         
Diluted earnings per share attributable to MTI
  
$
3.29
    
$
3.78
    
$
4.75
  


Of the options outstanding of 1,363,366, 1,227,620 and 1,054,259 for the years ended December 31, 2020, 2019 and 2018, respectively, options to purchase 591,322 shares, 825,331 shares and 568,284 shares of common stock for the years ended December 31, 2020, 2019 and 2018, 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.