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Earnings (Loss) per Share (Tables)
 6 Months Ended
Jun. 29, 2025
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
    
Six Months Ended
  
(in millions of dollars, except per share data)
  
Jun. 29,
2025
    
Jun. 30,
2024
    
Jun. 29,
2025
    
Jun. 30,
2024
  
Net income (loss) attributable to Minerals Technologies Inc.
  
$
45.4
    
$
19.7
    
$
(98.6
)
  
$
66.4
  
                                 
Weighted average shares outstanding
    
31.6
      
32.2
      
31.7
      
32.3
  
Dilutive effect of stock options and deferred restricted stock units
    
—
      
0.2
      
—
      
0.1
  
Weighted average shares outstanding, adjusted
    
31.6
      
32.4
      
31.7
      
32.4
  
                                 
Basic earnings (loss) per share attributable to Minerals Technologies Inc.
  
$
1.44
    
$
0.61
    
$
(3.11
)
  
$
2.06
  
                                 
Diluted earnings (loss) per share attributable to Minerals Technologies Inc.
  
$
1.44
    
$
0.61
    
$
(3.11
)
  
$
2.05