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Earnings Per Share (EPS) (Tables)
 12 Months Ended
Dec. 31, 2019
Earnings Per Share (EPS) [Abstract]  
Computation of Basic and Diluted Earnings Per Share

 
Year Ended December 31,
  
(in millions, except per share data)
  
2019
    
2018
    
2017
  
Net income attributable to MTI
  
$
132.7
    
$
169.0
    
$
195.1
  
                         
                         
Weighted average shares outstanding
    
35.0
      
35.3
      
35.2
  
Dilutive effect of stock options and stock units
    
0.1
      
0.3
      
0.4
  
Weighted average shares outstanding, adjusted
    
35.1
      
35.6
      
35.6
  
                         
Basic earnings per share attributable to MTI
  
$
3.79
    
$
4.79
    
$
5.54
  
                         
Diluted earnings per share attributable to MTI
  
$
3.78
    
$
4.75
    
$
5.48