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Earnings per share (Tables) | 9 Months Ended
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Sep. 26, 2021
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share | Basic and diluted earnings per share were calculated as follows:
|  | Third Quarter |  | Year-to-date |
| In millions except share and per-share data | 2021 |  | 2020 |  | 2021 |  | 2020 |
| Basic earnings: |  |  |  |  |  |  |  |
| Net income from continuing operations | $ | 6.0 |  |  | $ | 2.4 |  |  | $ | 26.5 |  |  | $ | 14.2 |  |
| Net (loss) / income from discontinued operations | (1.2) |  |  | 0.2 |  |  | 3.8 |  |  | (1.3) |  |
| Net income | $ | 4.8 |  |  | $ | 2.6 |  |  | $ | 30.3 |  |  | $ | 12.9 |  |
| Weighted average number of £0.50 ordinary shares: |  |  |  |  |  |  |  |
| For basic earnings per share | 27,722,472 |  |  | 27,619,298 |  |  | 27,718,874 |  |  | 27,532,823 |  |
| Dilutive effect of potential common stock | 311,260 |  |  | 394,408 |  |  | 353,281 |  |  | 426,119 |  |
| For diluted earnings per share | 28,033,732 |  |  | 28,013,706 |  |  | 28,072,155 |  |  | 27,958,942 |  |
| Earnings / (loss) per share using weighted average number of ordinary shares outstanding 3: |
| Basic earnings per ordinary share for continuing operations | $ | 0.22 |  |  | $ | 0.09 |  |  | $ | 0.96 |  |  | $ | 0.52 |  |
| Basic (loss) / earnings per ordinary share for discontinued operations | (0.04) |  |  | 0.01 |  |  | 0.14 |  |  | (0.05) |  |
| Basic earnings per ordinary share | $ | 0.17 |  |  | $ | 0.09 |  |  | $ | 1.09 |  |  | $ | 0.47 |  |
| Diluted earnings per ordinary share for continuing operations | $ | 0.21 |  |  | $ | 0.09 |  |  | $ | 0.94 |  |  | $ | 0.51 |  |
| Diluted (loss) / earnings per ordinary share for discontinued operations | (0.04) |  |  | 0.01 |  |  | 0.14 |  |  | (0.05) |  |
| Diluted earnings per ordinary share | $ | 0.17 |  |  | $ | 0.09 |  |  | $ | 1.08 |  |  | $ | 0.46 |  |
3 The calculation of earnings per share is performed separately for continuing and discontinued operations. As a result, the sum of the two in any particular period may not equal the earnings-per-share amount in total

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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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