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Earnings per Share (EPS)
 3 Months Ended
Mar. 31, 2019
Earnings per Share (EPS) [Abstract]  
Earnings per Share (EPS)
Note 5.  Earnings per Share (EPS)

Basic earnings per share are based upon the weighted average number of common shares outstanding during the period. Diluted earnings per share are based upon the weighted average number of common shares outstanding during the period assuming the issuance of common shares for all potentially dilutive common shares outstanding.

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
 

Options to purchase 748,754 shares and 362,443 shares of common stock for the three-month periods ended March 31, 2019 and April 1, 2018, respectively, were not included in the computation of diluted earnings per share because they were anti-dilutive, as the exercise prices of the options were greater than the average market price of the common shares.