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Earnings per share
 12 Months Ended
Dec. 31, 2022
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 share equivalents.
Basic and diluted earnings per share were calculated as follows:
Years ended December 31,
In millions except share and per-share data202220212020
Basic earnings:
Net income from continuing operations$32.0 $30.0 $20.8 
Net gain / (loss) from discontinued operations(5.1)(0.1)(0.8)
Net income$26.9 $29.9 $20.0 
Weighted average number of £0.50 ordinary shares:
For basic earnings per share27,304,847 27,698,691 27,557,219 
Dilutive effect of potential common stock236,355 333,815 414,163 
For diluted earnings per share27,541,202 28,032,506 27,971,382 
Earnings / (loss) per share using weighted average number of ordinary shares outstanding:(1)
Basic from continuing operations$1.17 $1.08 $0.75 
Basic from discontinued operations$(0.19)$— $(0.03)
Basic earnings per ordinary share$0.99 $1.08 $0.73 
Diluted from continuing operations$1.16 $1.07 $0.74 
Diluted from discontinued operations$(0.19)$— $(0.03)
Diluted earnings per ordinary share $0.98 $1.07 $0.72 
(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.