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Earnings per share (Tables) | 9 Months Ended
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Oct. 01, 2023
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 | 2023 |  | 2022 |  | 2023 |  | 2022 |
| Basic (loss) / earnings: |  |  |  |  |  |  |  |
| Net (loss) / income from continuing operations | $ | (1.5) |  |  | $ | 8.5 |  |  | $ | 3.9 |  |  | $ | 25.8 |  |
| Net income / (loss) from discontinued operations | 0.2 |  |  | (0.5) |  |  | — |  |  | (0.9) |  |
| Net (loss) / income | $ | (1.3) |  |  | $ | 8.0 |  |  | $ | 3.9 |  |  | $ | 24.9 |  |
| Weighted average number of £0.50 ordinary shares: |  |  |  |  |  |  |  |
| For basic earnings per share | 26,895,968 |  |  | 27,295,862 |  |  | 26,913,771 |  |  | 27,403,844 |  |
| Dilutive effect of potential common stock | 120,405 |  |  | 229,452 |  |  | 158,654 |  |  | 249,042 |  |
| For diluted earnings per share | 27,016,373 |  |  | 27,525,314 |  |  | 27,072,425 |  |  | 27,652,886 |  |
| (Loss) / earnings per share using weighted average number of ordinary shares outstanding(1): |
| Basic (loss) / earnings per ordinary share for continuing operations | $ | (0.06) |  |  | $ | 0.31 |  |  | $ | 0.14 |  |  | $ | 0.94 |  |
| Basic earnings / (loss) per ordinary share for discontinued operations | 0.01 |  |  | (0.02) |  |  | — |  |  | (0.03) |  |
| Basic (loss) / earnings per ordinary share | $ | (0.05) |  |  | $ | 0.29 |  |  | $ | 0.14 |  |  | $ | 0.91 |  |
| Diluted (loss) / earnings per ordinary share for continuing operations | $ | (0.06) |  |  | $ | 0.31 |  |  | $ | 0.14 |  |  | $ | 0.93 |  |
| Diluted earnings / (loss) per ordinary share for discontinued operations | 0.01 |  |  | (0.02) |  |  | — |  |  | (0.03) |  |
| Diluted (loss) / earnings per ordinary share | $ | (0.05) |  |  | $ | 0.29 |  |  | $ | 0.14 |  |  | $ | 0.90 |  |
(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 -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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