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Earnings per share (Tables) | 9 Months Ended
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Sep. 28, 2025
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 | 2025 |  | 2024 |  | 2025 |  | 2024 |
| Basic earnings / (loss): |  |  |  |  |  |  |  |
| Net income from continuing operations | $ | 2.5 |  |  | $ | 12.6 |  |  | $ | 13.0 |  |  | $ | 15.0 |  |
| Net income / (loss) from discontinued operations | 0.2 |  |  | 0.1 |  |  | (2.2) |  |  | (0.1) |  |
| Net income | $ | 2.7 |  |  | $ | 12.7 |  |  | $ | 10.8 |  |  | $ | 14.9 |  |
| Weighted average number of £0.50 ordinary shares: |  |  |  |  |  |  |  |
| For basic earnings per share | 26,746,390 |  |  | 26,808,401 |  |  | 26,743,059 |  |  | 26,820,280 |  |
| Dilutive effect of potential common stock | 412,634 |  |  | 124,010 |  |  | 446,397 |  |  | 140,845 |  |
| For diluted earnings per share | 27,159,024 |  |  | 26,932,411 |  |  | 27,189,456 |  |  | 26,961,125 |  |
| Earnings per share using weighted average number of ordinary shares outstanding(1): |
| Basic earnings per ordinary share for continuing operations | $ | 0.09 |  |  | $ | 0.47 |  |  | $ | 0.49 |  |  | $ | 0.56 |  |
| Basic earnings / (loss) per ordinary share for discontinued operations | 0.01 |  |  | — |  |  | (0.08) |  |  | — |  |
| Basic earnings per ordinary share | $ | 0.10 |  |  | $ | 0.47 |  |  | $ | 0.41 |  |  | $ | 0.56 |  |
| Diluted earnings per ordinary share for continuing operations | $ | 0.09 |  |  | $ | 0.47 |  |  | $ | 0.48 |  |  | $ | 0.56 |  |
| Diluted earnings / (loss) per ordinary share for discontinued operations | 0.01 |  |  | — |  |  | (0.08) |  |  | — |  |
| Diluted earnings per ordinary share | $ | 0.10 |  |  | $ | 0.47 |  |  | $ | 0.40 |  |  | $ | 0.55 |  |
(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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