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Earnings per share (Tables) | 3 Months Ended
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Mar. 28, 2021
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share | Basic and diluted earnings per share were calculated as follows:
|  | First Quarter |
| In millions except share and per-share data | 2021 |  | 2020 |  |  |
| Basic earnings: |  |  |  |  |  |
| Net income from continuing operations | $ | 8.6 |  |  | $ | 7.2 |  |  |  |
| Net income / ( loss) from discontinued operations | 5.9 |  |  | (1.0) |  |  |  |
| Net income | $ | 14.5 |  |  | $ | 6.2 |  |  |  |
| Weighted average number of £0.50 ordinary shares: |  |  |  |  |  |
| For basic earnings per share | 27,658,871 |  |  | 27,440,423 |  |  |  |
| Dilutive effect of potential common stock | 398,452 |  |  | 453,635 |  |  |  |
| For diluted earnings per share | 28,057,323 |  |  | 27,894,058 |  |  |  |
| Earnings / (loss) per share using weighted average number of ordinary shares outstanding:(1) |  |  |  |  |  |
| Basic earnings per ordinary share for continuing operations | $ | 0.31 |  |  | $ | 0.26 |  |  |  |
| Basic earnings / (loss) per ordinary share for discontinued operations | $ | 0.21 |  |  | $ | (0.04) |  |  |  |
| Basic earnings per ordinary share | $ | 0.52 |  |  | $ | 0.23 |  |  |  |
| Diluted earnings per ordinary share for continuing activities | $ | 0.31 |  |  | $ | 0.26 |  |  |  |
| Diluted earnings / (loss) per ordinary share for discontinued operations | $ | 0.21 |  |  | $ | (0.04) |  |  |  |
| Diluted earnings per ordinary share | $ | 0.52 |  |  | $ | 0.22 |  |  |  |
(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 -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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