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Earnings per share | 12 Months Ended
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Dec. 31, 2023
Earnings Per Share [Abstract] |
Earnings per share | Earnings per share Basic loss / earnings per share are computed by dividing net loss / income for the period by the weighted-average number of ordinary shares outstanding, net of Treasury shares and shares held in ESOP. Diluted loss / earnings per share are computed by dividing net loss / income for the period by the weighted average number of ordinary shares outstanding and the dilutive ordinary share equivalents. Basic and diluted loss / earnings per share were calculated as follows:
|  | Years ended December 31, |
| In millions except share and per-share data | 2023 |  | 2022 |  | 2021 |
| Basic (loss) / earnings: |  |  |  |  |  |
| Net (loss) / income from continuing operations | $ | (2.6) |  |  | $ | 32.0 |  |  | $ | 30.0 |  |
| Net income / (loss) from discontinued operations (including net gain on disposition of $6.6m in 2021) | 0.7 |  |  | (5.1) |  |  | (0.1) |  |
| Net (loss) / income | $ | (1.9) |  |  | $ | 26.9 |  |  | $ | 29.9 |  |
| Weighted average number of £0.50 ordinary shares: |  |  |  |  |  |
| For basic loss / earnings per share | 26,897,556 |  |  | 27,304,847 |  |  | 27,698,691 |  |
| Dilutive effect of potential common stock | 123,403 |  |  | 236,355 |  |  | 333,815 |  |
| For diluted loss / earnings per share | 27,020,959 |  |  | 27,541,202 |  |  | 28,032,506 |  |
| (Loss) / earnings per share using weighted average number of ordinary shares outstanding:(1)(2) |  |  |  |  |  |
| Basic from continuing operations | $ | (0.10) |  |  | $ | 1.17 |  |  | $ | 1.08 |  |
| Basic from discontinued operations | $ | 0.03 |  |  | $ | (0.19) |  |  | $ | — |  |
| Basic (loss) / earnings per ordinary share | $ | (0.07) |  |  | $ | 0.99 |  |  | $ | 1.08 |  |
| Diluted from continuing operations | $ | (0.10) |  |  | $ | 1.16 |  |  | $ | 1.07 |  |
| Diluted from discontinued operations | $ | 0.03 |  |  | $ | (0.19) |  |  | $ | — |  |
| Diluted (loss) / earnings per ordinary share | $ | (0.07) |  |  | $ | 0.98 |  |  | $ | 1.07 |  |
(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 year may not equal the earnings-per-share amount in total. (2) The loss per share for continuing operations in 2023 has not been diluted, since the incremental shares included in the weighted-average number of shares outstanding would have been anti-dilutive.

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