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Earnings Per Share
 12 Months Ended
Dec. 31, 2021
Earnings per Share [Abstract]  
Earnings per Share (EPS)
Note 7.  Earnings Per Share (EPS)

  
Year Ended December 31,
  
(in millions, except per share data)
  
2021
    
2020
    
2019
  
Net income attributable to MTI
  
$
164.4
    
$
112.4
    
$
132.7
  
                         
                         
Weighted average shares outstanding
    
33.6
      
34.2
      
35.0
  
Dilutive effect of stock options and stock units
    
0.2
      
—
      
0.1
  
Weighted average shares outstanding, adjusted
    
33.8
      
34.2
      
35.1
  
                         
Basic earnings per share attributable to MTI
  
$
4.89
    
$
3.29
    
$
3.79
  
                         
Diluted earnings per share attributable to MTI
  
$
4.86
    
$
3.29
    
$
3.78
  


Of the options outstanding of 1,330,002, 1,363,366 and 1,227,620 for the years ended December 31, 2021, 2020 and 2019, respectively, options to purchase 510,683 shares, 591,322 shares and 825,331 shares of common stock for the years ended December 31, 2021, 2020 and 2019, 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.