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Quarterly Financial Data (unaudited) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Oct. 01, 2017
Jul. 02, 2017
Apr. 02, 2017
Dec. 31, 2016
Oct. 02, 2016
Jul. 03, 2016
Apr. 03, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenue from External Customer [Line Items]                      
Net sales $ 432.1 $ 424.5 $ 414.1 $ 405.0 $ 401.3 $ 399.5 $ 427.0 $ 410.2 $ 1,675.7 $ 1,638.0 $ 1,797.6
Gross profit 114.5 119.3 119.7 113.7 111.4 115.2 121.1 112.7 467.2 460.4 471.0
Income from operations 45.7 66.8 68.5 61.7 56.5 67.3 39.5 57.6 242.7 220.9 200.3
Consolidated net income 76.7 42.8 43.8 35.6 37.5 42.5 22.3 34.8 199.0 137.1 111.6
Net income attributable to Minerals Technologies Inc. (MTI) $ 75.8 $ 41.7 $ 43.0 $ 34.6 $ 36.7 $ 41.6 $ 21.2 $ 33.9 $ 195.1 $ 133.4 $ 107.9
Basic earnings per share attributable to MTI shareholders (in dollars per share) $ 2.14 $ 1.18 $ 1.23 $ 0.99 $ 1.05 $ 1.19 $ 0.61 $ 0.97 $ 5.54 $ 3.82 $ 3.11
Diluted earnings per share attributable to MTI shareholders (in dollars per share) 2.12 1.17 1.21 0.97 1.04 1.18 0.60 0.97 5.48 3.79 $ 3.08
Market price range per share of common stock [Abstract]                      
High (in dollars per share) 73.55 75.60 80.20 83.70 82.90 72.51 61.66 57.12      
Low (in dollars per share) 66.40 62.95 70.50 72.20 66.10 56.00 52.53 37.03      
Close (in dollars per share) 68.85 70.65 73.20 76.60 77.25 70.69 57.38 57.12 68.85 $ 77.25  
Dividends paid per common share (in dollars per share) $ 0.05 $ 0.05 $ 0.05 $ 0.05 $ 0.05 $ 0.05 $ 0.05 $ 0.05 $ 0.20    
Specialty Minerals [Member]                      
Revenue from External Customer [Line Items]                      
Net sales $ 143.9 $ 147.7 $ 147.0 $ 146.2 $ 138.0 $ 147.3 $ 150.6 $ 155.6      
Performance Materials [Member]                      
Revenue from External Customer [Line Items]                      
Net sales 195.8 188.8 180.3 169.9 175.0 169.0 182.5 159.6      
Refractories [Member]                      
Revenue from External Customer [Line Items]                      
Net sales 71.3 69.0 68.9 70.2 68.0 63.4 73.9 69.2      
Energy Services [Member]                      
Revenue from External Customer [Line Items]                      
Net sales $ 21.1 $ 19.0 $ 17.9 $ 18.7 $ 20.3 $ 19.8 $ 20.0 $ 25.8