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Earnings Per Share (EPS) (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share (EPS) [Abstract] |
Computation of basic and diluted earnings per share |
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | (in millions, except per share data) |
Net income attributable to MTI |  | $ | 195.1 |  |  | $ | 133.4 |  |  | $ | 107.9 |
Weighted average shares outstanding |  |  | 35.2 |  |  |  | 34.9 |  |  |  | 34.7 |
Dilutive effect of stock options and stock units |  |  | 0.4 |  |  |  | 0.3 |  |  |  | 0.3 |
Weighted average shares outstanding, adjusted |  |  | 35.6 |  |  |  | 35.2 |  |  |  | 35.0 |
Basic earnings per share attributable to MTI |  | $ | 5.54 |  |  | $ | 3.82 |  |  | $ | 3.11 |
Diluted earnings per share attributable to MTI |  | $ | 5.48 |  |  | $ | 3.79 |  |  | $ | 3.08 |

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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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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