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Earnings per share (Tables) | 6 Months Ended
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Jun. 26, 2022
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 | 2022 |  | 2021 |  | 2022 |  | 2021 |
| Basic earnings: |  |  |  |  |  |  |  |
| Net income from continuing operations | $ | 9.6 |  |  | $ | 11.9 |  |  | $ | 17.3 |  |  | $ | 20.5 |  |
| Net (loss) / income from discontinued operations | (0.3) |  |  | (0.9) |  |  | (0.4) |  |  | 5.0 |  |
| Net income | $ | 9.3 |  |  | $ | 11.0 |  |  | $ | 16.9 |  |  | $ | 25.5 |  |
| Weighted average number of £0.50 ordinary shares: |  |  |  |  |  |  |  |
| For basic earnings per share | 27,428,579 |  |  | 27,771,983 |  |  | 27,458,980 |  |  | 27,717,025 |  |
| Dilutive effect of potential common stock | 274,638 |  |  | 359,802 |  |  | 261,085 |  |  | 378,763 |  |
| For diluted earnings per share | 27,703,217 |  |  | 28,131,785 |  |  | 27,720,065 |  |  | 28,095,788 |  |
| Earnings / (loss) per share using weighted average number of ordinary shares outstanding(1): |
| Basic earnings per ordinary share for continuing operations | $ | 0.35 |  |  | $ | 0.43 |  |  | $ | 0.63 |  |  | $ | 0.74 |  |
| Basic (loss) / earnings per ordinary share for discontinued operations | (0.01) |  |  | (0.03) |  |  | (0.01) |  |  | 0.18 |  |
| Basic earnings per ordinary share | $ | 0.34 |  |  | $ | 0.40 |  |  | $ | 0.62 |  |  | $ | 0.92 |  |
| Diluted earnings per ordinary share for continuing operations | $ | 0.35 |  |  | $ | 0.42 |  |  | $ | 0.62 |  |  | $ | 0.73 |  |
| Diluted (loss) / earnings per ordinary share for discontinued operations | (0.01) |  |  | (0.03) |  |  | (0.01) |  |  | 0.18 |  |
| Diluted earnings per ordinary share | $ | 0.34 |  |  | $ | 0.39 |  |  | $ | 0.61 |  |  | $ | 0.91 |  |
(1) 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 https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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