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Earnings per Share (EPS) (Tables)
 9 Months Ended
Sep. 27, 2020
Earnings per Share [Abstract]  
Computation of Basic and Diluted Earnings Per Share

The following table sets forth the computation of basic and diluted earnings per share:

  
Three Months Ended
    
Nine Months Ended
  
(in millions, except per share data)
  
Sep. 27,
2020
    
Sep. 29,
2019
    
Sep. 27,
2020
    
Sep. 29,
2019
  
Net income attributable to Minerals Technologies Inc.
  
$
28.3
    
$
38.0
    
$
81.3
    
$
103.7
  
                                 
Weighted average shares outstanding
    
34.1
      
35.0
      
34.2
      
35.1
  
Dilutive effect of stock options and stock units
    
—
      
0.1
      
—
      
0.1
  
Weighted average shares outstanding, adjusted
    
34.1
      
35.1
      
34.2
      
35.2
  
                                 
Basic earnings per share attributable to Minerals Technologies Inc.
  
$
0.83
    
$
1.09
    
$
2.38
    
$
2.95
  
                                 
Diluted earnings per share attributable to Minerals Technologies Inc.
  
$
0.83
    
$
1.08
    
$
2.38
    
$
2.95