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Earnings per Share (EPS) (Tables)
 3 Months Ended
Mar. 31, 2019
Earnings per Share (EPS) [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
 
(in millions, except per share data)
 
Mar. 31,
2019
  
Apr. 1,
2018
 
       
Net income attributable to Minerals Technologies Inc.
 
$
39.1
  
$
39.9
 
         
Weighted average shares outstanding
  
35.2
   
35.4
 
Dilutive effect of stock options and stock units
  
0.1
   
0.3
 
Weighted average shares outstanding, adjusted
  
35.3
   
35.7
 
         
Basic earnings per share attributable to Minerals Technologies Inc.
 
$
1.11
  
$
1.13
 
         
Diluted earnings per share attributable to Minerals Technologies Inc.
 
$
1.11
  
$
1.12