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Earnings per share (Tables) | 9 Months Ended
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Sep. 29, 2019
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 | 2019 |  | 2018 |  | 2019 |  | 2018 |
| Basic earnings: |  |  |  |  |  |  |  |
| Net income | $ | 5.8 |  |  | $ | 12.2 |  |  | $ | 5.5 |  |  | $ | 33.5 |  |
| Weighted average number of £0.50 ordinary shares: |  |  |  |  |  |  |  |
| For basic earnings per share | 27,393,743 |  |  | 26,773,064 |  |  | 27,243,638 |  |  | 26,614,646 |  |
| Dilutive effect of potential common stock | 475,673 |  |  | 884,029 |  |  | 599,887 |  |  | 892,881 |  |
| For diluted earnings per share | 27,869,416 |  |  | 27,657,093 |  |  | 27,843,525 |  |  | 27,507,527 |  |
| Earnings per share using weighted average number of ordinary shares outstanding: |  |  |  |  |  |  |  |
| Basic earnings per ordinary share | $ | 0.21 |  |  | $ | 0.46 |  |  | $ | 0.20 |  |  | $ | 1.26 |  |
| Diluted earnings per ordinary share | $ | 0.21 |  |  | $ | 0.44 |  |  | $ | 0.20 |  |  | $ | 1.22 |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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