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Earnings per share Earnings per share (Tables) | 12 Months Ended
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Dec. 31, 2018
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 | 2018 |  | 2017 |  | 2016 |
| Basic earnings: |  |  |  |  |  |
| Net income | $ | 25.0 |  |  | $ | 16.6 |  |  | $ | 17.8 |  |
| Weighted average number of £0.50 ordinary shares: |  |  |  |  |  |
| For basic earnings per share | 26,708,469 |  |  | 26,460,947 |  |  | 26,443,662 |  |
| Dilutive effect of potential common stock | 983,793 |  |  | 263,034 |  |  | 210,976 |  |
| For diluted earnings per share | 27,692,262 |  |  | 26,723,981 |  |  | 26,654,638 |  |
| Earnings per share using weighted average number of ordinary shares outstanding: |  |  |  |  |  |
| Basic earnings per ordinary share | $ | 0.94 |  |  | $ | 0.63 |  |  | $ | 0.67 |  |
| Diluted earnings per ordinary share | $ | 0.90 |  |  | $ | 0.62 |  |  | $ | 0.67 |  |

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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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