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Quarterly Financial Data (unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 27, 2020 | Jun. 28, 2020 | Mar. 29, 2020 | Dec. 31, 2019 | Sep. 29, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenue from External Customer [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 431.8 | $ 388.3 | $ 357.2 | $ 417.5 | $ 440.2 | $ 449.3 | $ 463.8 | $ 437.7 | $ 1,594.8 | $ 1,791.0 | $ 1,807.6
Gross profit | 111.3 | 98.4 | 88.9 | 106.8 | 107.7 | 111.2 | 112.0 | 109.7 | 405.4 | 440.6 | 461.4
Income from operations | 54.5 | 48.5 | 27.2 | 57.7 | 47.7 | 53.5 | 45.5 | 62.0 | 187.9 | 208.7 | 255.9
Consolidated net income | 32.0 | 29.3 | 14.9 | 39.6 | 29.6 | 39.1 | 27.6 | 40.0 | 115.8 | 136.4 | 173.2
Net income attributable to MTI | $ 31.1 | $ 28.3 | $ 14.4 | $ 38.6 | $ 29.0 | $ 38.0 | $ 26.6 | $ 39.1 | $ 112.4 | $ 132.7 | $ 169.0
Basic earnings per share attributable to MTI shareholders (in dollars per share) | $ 0.91 | $ 0.83 | $ 0.42 | $ 1.12 | $ 0.83 | $ 1.09 | $ 0.76 | $ 1.11 | $ 3.29 | $ 3.79 | $ 4.79
Diluted earnings per share attributable to MTI shareholders (in dollars per share) | 0.91 | 0.83 | 0.42 | 1.12 | 0.83 | 1.08 | 0.75 | 1.11 | 3.29 | 3.78 | $ 4.75
Market price range per share of common stock [Abstract] |  |  |  |  |  |  |  |  |  |  |
High (in dollars per share) | 64.16 | 53.34 | 55.42 | 58.91 | 58.12 | 55.33 | 63.20 | 61.01 |  |  |
Low (in dollars per share) | 51.10 | 43.11 | 31.91 | 28.90 | 48.92 | 45.55 | 51.78 | 49.47 |  |  |
Close (in dollars per share) | 62.12 | 49.23 | 43.20 | 32.48 | 57.63 | 52.77 | 53.51 | 58.79 | 62.12 | $ 57.63 |
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 |  |
Performance Materials Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 202.2 | $ 190.6 | $ 173.8 | $ 186.2 | $ 201.4 | $ 207.3 | $ 215.4 | $ 199.2 | $ 752.8 | $ 823.3 | $ 828.1
Specialty Minerals Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales | 138.9 | 125.1 | 109.8 | 137.1 | 141.8 | 143.1 | 145.1 | 144.4 | 510.9 | 574.4 | 589.3
Refractories Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales | 73.9 | 59.3 | 55.9 | 69.0 | 73.4 | 73.4 | 77.5 | 73.8 | 258.1 | 298.1 | 311.9
Energy Services Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 16.8 | $ 13.3 | $ 17.7 | $ 25.2 | $ 23.6 | $ 25.5 | $ 25.8 | $ 20.3 | $ 73.0 | $ 95.2 | $ 78.3

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