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Earnings (Loss) per Share (Tables)
 9 Months Ended
Sep. 29, 2024
Earnings (Loss) per Share [Abstract]  
Computation of Basic and Diluted Earnings (Loss) per Share

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

 
Three Months Ended
    
Nine Months Ended
  
(in millions of dollars, except per share data)
  
Sep. 29,
2024
    
Oct. 1,
2023
    
Sep. 29,
2024
    
Oct. 1,
2023
  
                         
Net income (loss) attributable to Minerals Technologies Inc.
  
$
46.7
    
$
(19.2
)
  
$
113.1
    
$
44.4
  
                                 
Weighted average shares outstanding
    
32.1
      
32.5
      
32.2
      
32.5
  
Dilutive effect of stock options and deferred restricted stock units
    
0.2
      
—
      
0.2
      
0.1
  
Weighted average shares outstanding, adjusted
    
32.3
      
32.5
      
32.4
      
32.6
  
                                 
Basic earnings (loss) per share attributable to Minerals Technologies Inc.
  
$
1.45
    
$
(0.59
)
  
$
3.51
    
$
1.37
  
                                 
Diluted earnings (loss) per share attributable to Minerals Technologies Inc.
  
$
1.45
    
$
(0.59
)
  
$
3.49
    
$
1.36