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Earnings per share (Tables)
 12 Months Ended
Dec. 31, 2022
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 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.