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Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Apr. 03, 2022
Apr. 04, 2021
Earnings per Share [Abstract]    
Net income attributable to Minerals Technologies Inc. $ 44.1 $ 39.9
Weighted average shares outstanding (in shares) 33,100,000 33,800,000
Dilutive effect of stock options and stock units (in shares) 100,000 200,000
Weighted average shares outstanding, adjusted (in shares) 33,200,000 34,000,000.0
Basic earnings per share attributable to Minerals Technologies Inc. (in dollars per share) $ 1.33 $ 1.18
Diluted earnings per share attributable to Minerals Technologies Inc. (in dollars per share) $ 1.33 $ 1.17
Stock Options [Member]    
Earnings per Share [Abstract]    
Options outstanding (in shares) 1,536,887 1,499,373
Anti-dilutive securities not included in computation of diluted earnings per share (in shares) 732,874 558,734