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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2021
Earnings per Share [Abstract] |
Computation of Basic and Diluted Earnings Per Share |
|  | Year Ended December 31, |
(in millions, except per share data) |  | 2021 |  |  | 2020 |  |  | 2019 |
Net income attributable to MTI |  | $ | 164.4 |  |  | $ | 112.4 |  |  | $ | 132.7 |
Weighted average shares outstanding |  |  | 33.6 |  |  |  | 34.2 |  |  |  | 35.0 |
Dilutive effect of stock options and stock units |  |  | 0.2 |  |  |  | — |  |  |  | 0.1 |
Weighted average shares outstanding, adjusted |  |  | 33.8 |  |  |  | 34.2 |  |  |  | 35.1 |
Basic earnings per share attributable to MTI |  | $ | 4.89 |  |  | $ | 3.29 |  |  | $ | 3.79 |
Diluted earnings per share attributable to MTI |  | $ | 4.86 |  |  | $ | 3.29 |  |  | $ | 3.78 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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