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Earnings (Loss) per Share (Tables) | 9 Months Ended
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Sep. 28, 2025
Earnings (Loss) per Share [Abstract] |
Computation of Basic and Diluted Earnings (Loss) per Share | The following table sets forth the computation of basic and diluted earnings (loss) per share:
| Three Months Ended |  | Nine Months Ended
|  | Sep. 28, |  |  |  | Sep. 29, |  |  |  | Sep. 28, |  |  |  | Sep. 29, |
(in millions of dollars, except per share data) |  | 2025 |  |  |  | 2024 |  |  |  | 2025 |  |  |  | 2024 |
Net income (loss) attributable to Minerals Technologies Inc. | $ | 43.0 |  |  | $ | 46.7 |  |  | $ | (55.6 | ) |  | $ | 113.1 |
Weighted average shares outstanding |  | 31.3 |  |  |  | 32.1 |  |  |  | 31.6 |  |  |  | 32.2 |
Dilutive effect of stock options and deferred restricted stock units |  | - |  |  |  | 0.2 |  |  |  | - |  |  |  | 0.2 |
Weighted average shares outstanding, adjusted |  | 31.3 |  |  |  | 32.3 |  |  |  | 31.6 |  |  |  | 32.4 |
Basic earnings (loss) per share attributable to Minerals Technologies Inc. | $ | 1.37 |  |  | $ | 1.45 |  |  | $ | (1.76 | ) |  | $ | 3.51 |
Diluted earnings (loss) per share attributable to Minerals Technologies Inc. | $ | 1.37 |  |  | $ | 1.45 |  |  | $ | (1.76 | ) |  | $ | 3.49 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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