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Earnings per share (Tables) | 6 Months Ended
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Jun. 30, 2024
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 | 2024 |  | 2023 |  | 2024 |  | 2023 |
| Basic (loss) / earnings: |  |  |  |  |  |  |  |
| Net (loss) / income from continuing operations | $ | (0.4) |  |  | $ | 4.9 |  |  | $ | 2.4 |  |  | $ | 5.4 |  |
| Net loss from discontinued operations | (0.1) |  |  | (0.2) |  |  | (0.2) |  |  | (0.2) |  |
| Net (loss) / income | $ | (0.5) |  |  | $ | 4.7 |  |  | $ | 2.2 |  |  | $ | 5.2 |  |
| Weighted average number of £0.50 ordinary shares: |  |  |  |  |  |  |  |
| For basic earnings per share | 26,831,372 |  |  | 26,923,804 |  |  | 26,826,123 |  |  | 26,922,528 |  |
| Dilutive effect of potential common stock | 100,919 |  |  | 141,534 |  |  | 66,107 |  |  | 161,458 |  |
| For diluted earnings per share | 26,932,291 |  |  | 27,065,338 |  |  | 26,892,230 |  |  | 27,083,986 |  |
| (Loss) / earnings per share using weighted average number of ordinary shares outstanding(1): |
| Basic (loss) / earnings per ordinary share for continuing operations | $ | (0.01) |  |  | $ | 0.18 |  |  | $ | 0.09 |  |  | $ | 0.20 |  |
| Basic loss per ordinary share for discontinued operations | (0.01) |  |  | (0.01) |  |  | (0.01) |  |  | (0.01) |  |
| Basic (loss) / earnings per ordinary share | $ | (0.02) |  |  | $ | 0.17 |  |  | $ | 0.08 |  |  | $ | 0.19 |  |
| Diluted (loss) / earnings per ordinary share for continuing operations | $ | (0.01) |  |  | $ | 0.18 |  |  | $ | 0.09 |  |  | $ | 0.20 |  |
| Diluted loss per ordinary share for discontinued operations | — |  |  | (0.01) |  |  | (0.01) |  |  | (0.01) |  |
| Diluted (loss) / earnings per ordinary share | $ | (0.02) |  |  | $ | 0.17 |  |  | $ | 0.08 |  |  | $ | 0.19 |  |
(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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