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Earnings per Share (Tables)
 6 Months Ended
Jul. 04, 2021
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
    
Six Months Ended
  
(in millions, except per share data)
  
Jul. 4,
2021
    
Jun. 28,
2020
    
Jul. 4,
2021
    
Jun. 28,
2020
  
                         
Net income attributable to Minerals Technologies Inc.
  
$
41.9
    
$
14.4
    
$
81.8
    
$
53.0
  
                                 
Weighted average shares outstanding
    
33.7
      
34.1
      
33.8
      
34.2
  
Dilutive effect of stock options and stock units
    
0.4
      
—
      
0.2
      
0.1
  
Weighted average shares outstanding, adjusted
    
34.1
      
34.1
      
34.0
      
34.3
  
                                 
Basic earnings per share attributable to Minerals Technologies Inc.
  
$
1.24
    
$
0.42
    
$
2.42
    
$
1.55
  
                                 
Diluted earnings per share attributable to Minerals Technologies Inc.
  
$
1.23
    
$
0.42
    
$
2.41
    
$
1.55