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Earnings per share (Tables) | 6 Months Ended
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Jun. 28, 2020
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share | Basic and diluted earnings per share were calculated as follows:
|  | Second Quarter |  |  |  | Year-to-date |  |  |
| In millions except share and per-share data | 2020 |  | 2019 |  | 2020 |  | 2019 |
| Basic earnings: |  |  |  |  |  |  |  |
| Net income / (loss) | $ | 4.1 |  |  | $ | 3.5 |  |  | $ | 10.3 |  |  | $ | (0.3) |  |
| Weighted average number of €0.50 ordinary shares: |  |  |  |  |  |  |  |
| For basic earnings per share | 27,540,377 |  |  | 27,302,174 |  |  | 27,490,955 |  |  | 27,168,170 |  |
| Dilutive effect of potential common stock | 428,448 |  |  | 587,735 |  |  | 442,164 |  |  | — |  |
| For diluted earnings per share | 27,968,825 |  |  | 27,889,909 |  |  | 27,933,119 |  |  | 27,168,170 |  |
| Earnings / (loss) per share using weighted average number of ordinary shares outstanding: |  |  |  |  |  |  |  |
| Basic earnings / (loss) per ordinary share | $ | 0.15 |  |  | $ | 0.13 |  |  | $ | 0.37 |  |  | $ | (0.01) |  |
| Diluted earnings / (loss) per ordinary share | $ | 0.15 |  |  | $ | 0.13 |  |  | $ | 0.37 |  |  | $ | (0.01) |  |

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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=6371337&loc=d3e3550-109257 + Details
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