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Earnings per share (Tables) | 3 Months Ended
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Mar. 29, 2020
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share | Basic and diluted earnings per share were calculated as follows:
|  | First Quarter |
| In millions except share and per-share data | 2020 |  | 2019 |
| Basic earnings: |  |  |  |
| Net income / (loss) | $ | 6.2 |  |  | $ | (3.8 | ) |
| Weighted average number of £0.50 ordinary shares: |  |  |  |
| For basic earnings per share | 27,440,423 |  |  | 27,032,677 |  |
| Dilutive effect of potential common stock | 453,635 |  |  | — |  |
| For diluted earnings per share | 27,894,058 |  |  | 27,032,677 |  |
| Earnings / (loss) per share using weighted average number of ordinary shares outstanding: |  |  |  |
| Basic earnings / (loss) per ordinary share | $ | 0.23 |  |  | $ | (0.14 | ) |
| Diluted earnings / (loss) per ordinary share | $ | 0.22 |  |  | $ | (0.14 | ) |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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