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Quarterly Financial Data (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Data (unaudited) [Abstract] |
Quarterly Financial Data |
|  | 2019 Quarters |
(millions of dollars, except per share data) |  | First |  |  | Second |  |  | Third |  |  | Fourth |
Net sales by segment |  |  |  |  |  |  |  |  |  |  |  |
Performance Materials segment |  | $ | 199.2 |  |  | $ | 215.4 |  |  | $ | 207.3 |  |  | $ | 201.4 |
Specialty Minerals segment |  |  | 144.4 |  |  |  | 145.1 |  |  |  | 143.1 |  |  |  | 141.8 |
Refractories segment |  |  | 73.8 |  |  |  | 77.5 |  |  |  | 73.4 |  |  |  | 73.4 |
Energy Services segment |  |  | 20.3 |  |  |  | 25.8 |  |  |  | 25.5 |  |  |  | 23.6 |
Net sales |  |  | 437.7 |  |  |  | 463.8 |  |  |  | 449.3 |  |  |  | 440.2 |
Gross profit |  |  | 109.7 |  |  |  | 112.0 |  |  |  | 111.2 |  |  |  | 107.7 |
Income from operations |  |  | 62.0 |  |  |  | 45.5 |  |  |  | 53.5 |  |  |  | 47.7 |
Consolidated net income |  |  | 40.0 |  |  |  | 27.6 |  |  |  | 39.1 |  |  |  | 29.6 |
Net income attributable to Minerals Technologies Inc. (MTI) |  |  | 39.1 |  |  |  | 26.6 |  |  |  | 38.0 |  |  |  | 29.0 |
Basic earnings per share attributable to MTI shareholders |  | $ | 1.11 |  |  | $ | 0.76 |  |  | $ | 1.09 |  |  | $ | 0.83 |
Diluted earnings per share attributable to MTI shareholders |  | $ | 1.11 |  |  | $ | 0.75 |  |  | $ | 1.08 |  |  | $ | 0.83 |
Market price range per share of common stock: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
High |  | $ | 61.01 |  |  | $ | 63.20 |  |  | $ | 55.33 |  |  | $ | 58.12 |
Low |  | $ | 49.47 |  |  | $ | 51.78 |  |  | $ | 45.55 |  |  | $ | 48.92 |
Close |  | $ | 58.79 |  |  | $ | 53.51 |  |  | $ | 52.77 |  |  | $ | 57.63 |
Dividends paid per common share |  | $ | 0.05 |  |  | $ | 0.05 |  |  | $ | 0.05 |  |  | $ | 0.05 |
|  | 2018 Quarters |
(millions of dollars, except per share data) |  | First |  |  | Second |  |  | Third |  |  | Fourth |
Net sales by segment |  |  |  |  |  |  |  |  |  |  |  |
Performance Materials segment |  | $ | 187.3 |  |  | $ | 214.5 |  |  | $ | 219.5 |  |  | $ | 206.8 |
Specialty Minerals segment |  |  | 149.6 |  |  |  | 150.9 |  |  |  | 146.3 |  |  |  | 142.5 |
Refractories segment |  |  | 75.3 |  |  |  | 79.6 |  |  |  | 79.1 |  |  |  | 77.9 |
Energy Services segment |  |  | 19.1 |  |  |  | 19.7 |  |  |  | 19.2 |  |  |  | 20.3 |
Net sales |  |  | 431.3 |  |  |  | 464.7 |  |  |  | 464.1 |  |  |  | 447.5 |
Gross profit |  |  | 113.5 |  |  |  | 115.9 |  |  |  | 119.2 |  |  |  | 112.8 |
Income from operations |  |  | 62.6 |  |  |  | 62.8 |  |  |  | 68.2 |  |  |  | 62.3 |
Consolidated net income |  |  | 41.1 |  |  |  | 45.2 |  |  |  | 42.9 |  |  |  | 44.0 |
Net income attributable to MTI |  |  | 39.9 |  |  |  | 44.1 |  |  |  | 41.9 |  |  |  | 43.1 |
Basic earnings per share attributable to MTI shareholders |  | $ | 1.13 |  |  | $ | 1.25 |  |  | $ | 1.19 |  |  | $ | 1.22 |
Diluted earnings per share attributable to MTI shareholders |  | $ | 1.12 |  |  | $ | 1.24 |  |  | $ | 1.18 |  |  | $ | 1.22 |
Market price range per share of common stock: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
High |  | $ | 76.95 |  |  | $ | 76.40 |  |  | $ | 77.75 |  |  | $ | 67.65 |
Low |  | $ | 66.10 |  |  | $ | 65.10 |  |  | $ | 65.75 |  |  | $ | 47.89 |
Close |  | $ | 66.95 |  |  | $ | 75.35 |  |  | $ | 67.60 |  |  | $ | 51.34 |
Dividends paid per common share |  | $ | 0.05 |  |  | $ | 0.05 |  |  | $ | 0.05 |  |  | $ | 0.05 |

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118952077&loc=d3e1280-108306 + Details
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