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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2021
Earnings per Share [Abstract]  
Computation of Basic and Diluted Earnings Per Share
 
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