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Earnings per share (Tables) | 12 Months Ended
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Dec. 31, 2022
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share | Basic and diluted earnings per share were calculated as follows:
|  | Years ended December 31, |
| In millions except share and per-share data | 2022 |  | 2021 |  | 2020 |
| Basic earnings: |  |  |  |  |  |
| Net income from continuing operations | $ | 32.0 |  |  | $ | 30.0 |  |  | $ | 20.8 |  |
| Net gain / (loss) from discontinued operations | (5.1) |  |  | (0.1) |  |  | (0.8) |  |
| Net income | $ | 26.9 |  |  | $ | 29.9 |  |  | $ | 20.0 |  |
| Weighted average number of £0.50 ordinary shares: |  |  |  |  |  |
| For basic earnings per share | 27,304,847 |  |  | 27,698,691 |  |  | 27,557,219 |  |
| Dilutive effect of potential common stock | 236,355 |  |  | 333,815 |  |  | 414,163 |  |
| For diluted earnings per share | 27,541,202 |  |  | 28,032,506 |  |  | 27,971,382 |  |
| Earnings / (loss) per share using weighted average number of ordinary shares outstanding:(1) |  |  |  |  |  |
| Basic from continuing operations | $ | 1.17 |  |  | $ | 1.08 |  |  | $ | 0.75 |  |
| Basic from discontinued operations | $ | (0.19) |  |  | $ | — |  |  | $ | (0.03) |  |
| Basic earnings per ordinary share | $ | 0.99 |  |  | $ | 1.08 |  |  | $ | 0.73 |  |
| Diluted from continuing operations | $ | 1.16 |  |  | $ | 1.07 |  |  | $ | 0.74 |  |
| Diluted from discontinued operations | $ | (0.19) |  |  | $ | — |  |  | $ | (0.03) |  |
| Diluted earnings per ordinary share | $ | 0.98 |  |  | $ | 1.07 |  |  | $ | 0.72 |  |
(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.

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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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