Basic and diluted earnings per share were calculated as follows: | | | | | | | | | | | | | | | | | | | | | | | | | | Years ended December 31, | | | In millions except share and per-share data | 2021 | | 2020 | | 2019 | | | Basic earnings: | | | | | | | | Net income from continuing operations | $ | 30.0 | | | $ | 20.8 | | | $ | 8.7 | | | | Net gain / (loss) from discontinued operations | (0.1) | | | (0.8) | | | (5.6) | | | | Net income | $ | 29.9 | | | $ | 20.0 | | | $ | 3.1 | | | | | | | | | | | | Weighted average number of £0.50 ordinary shares: | | | | | | | | For basic earnings per share | 27,698,691 | | | 27,557,219 | | | 27,289,042 | | | | Dilutive effect of potential common stock | 333,815 | | | 414,163 | | | 593,822 | | | | For diluted earnings per share | 28,032,506 | | | 27,971,382 | | | 27,882,864 | | | | | | | | | | | | Earnings per share using weighted average number of ordinary shares outstanding:(1) | | | | | | | | Basic earnings per ordinary share for continuing operations | $ | 1.08 | | | $ | 0.75 | | | $ | 0.32 | | | | Basic earnings / (loss) per ordinary share for discontinued operations | $ | — | | | $ | (0.03) | | | $ | (0.21) | | | | Basic earnings per ordinary share | $ | 1.08 | | | $ | 0.73 | | | $ | 0.11 | | | | | | | | | | | | Diluted earnings per ordinary share for continuing activities | $ | 1.07 | | | $ | 0.74 | | | $ | 0.31 | | | | Diluted earnings / (loss) per ordinary share for discontinued operations | $ | — | | | $ | (0.03) | | | $ | (0.21) | | | | Diluted earnings per ordinary share | $ | 1.07 | | | $ | 0.72 | | | $ | 0.11 | | |
(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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