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Non-controlling interests (Tables) | 9 Months Ended
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Sep. 30, 2018
Non-controlling interests [Abstract] |
Total Equity, Equity Attributable to MTI, and Equity Attributable to Noncontrolling Interests | The following is a reconciliation of beginning and ending total equity, equity attributable to MTI, and equity attributable to non-controlling interests:
|  | Equity Attributable to MTI |  |  |  |  |  |  |
(millions of dollars) |  | Common Stock |  |  | Additional Paid-in Capital |  |  | Retained Earnings |  |  | Accumulated Other Comprehensive Income (Loss) |  |  | Treasury Stock |  |  | Non-controlling Interests |  |  | Total |
Balance as of December 31, 2017 |  | $ | 4.9 |  |  | $ | 422.7 |  |  | $ | 1,607.2 |  |  | $ | (186.1 | ) |  | $ | (597.0 | ) |  | $ | 27.4 |  |  | $ | 1,279.1 |
Net income |  |  | — |  |  |  | — |  |  |  | 125.9 |  |  |  | — |  |  |  | — |  |  |  | 3.3 |  |  |  | 129.2 |
Other comprehensive income (loss) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (52.7 | ) |  |  | — |  |  |  | (1.4 | ) |  |  | (54.1 | )
Dividends declared |  |  | — |  |  |  | — |  |  |  | (5.3 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (5.3 | )
Dividends to non-controlling interests |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (1.6 | ) |  |  | (1.6 | )
Capital contribution from non-controlling interests |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 3.7 |  |  |  | 3.7 |
Issuance of shares pursuant to employee stock compensation plans |  |  | — |  |  |  | 2.2 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 2.2 |
Stock based compensation |  |  | — |  |  |  | 4.7 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 4.7 |
Purchase of common stock |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (16.4 | ) |  |  | — |  |  |  | (16.4 | )
Balance as of September 30, 2018 |  | $ | 4.9 |  |  | $ | 429.6 |  |  | $ | 1,727.9 |  |  | $ | (238.8 | ) |  | $ | (613.4 | ) |  | $ | 31.4 |  |  | $ | 1,341.6 |

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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 + Details
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