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Earnings per share | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Earnings per share | Earnings per share Basic earnings per share are computed by dividing net income for the period by the weighted-average number of ordinary shares outstanding, net of Treasury shares and shares held in ESOP. Diluted earnings per share are computed by dividing net income for the period by the weighted average number of ordinary shares outstanding and the dilutive ordinary shares equivalents. 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 The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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