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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 |  |  |

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