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Earnings (Loss) per Share (Tables)
 3 Months Ended
Mar. 30, 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
  
(in millions, except per share data)
  
Mar. 30,
2025
    
Mar. 31,
2024
  
Net income (loss) attributable to Minerals Technologies Inc.
  
$
(144.0
)
  
$
46.7
  
                 
Weighted average shares outstanding
    
31.9
      
32.3
  
Dilutive effect of stock options and deferred restricted stock units
    
—
      
0.1
  
Weighted average shares outstanding, adjusted
    
31.9
      
32.4
  
                 
Basic earnings (loss) per share attributable to Minerals Technologies Inc.
  
$
(4.51
)
  
$
1.45
  
                 
Diluted earnings (loss) per share attributable to Minerals Technologies Inc.
  
$
(4.51
)
  
$
1.44