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Earnings per share (Tables)
 6 Months Ended
Jun. 30, 2024
Earnings Per Share [Abstract]  
Schedule of earnings per share
Basic and diluted earnings per share were calculated as follows:
Second QuarterYear-to-date
In millions except share and per-share data2024202320242023
Basic (loss) / earnings:
Net (loss) / income from continuing operations$(0.4)$4.9 $2.4 $5.4 
Net loss from discontinued operations(0.1)(0.2)(0.2)(0.2)
Net (loss) / income$(0.5)$4.7 $2.2 $5.2 
Weighted average number of £0.50 ordinary shares:
For basic earnings per share26,831,372 26,923,804 26,826,123 26,922,528 
Dilutive effect of potential common stock100,919 141,534 66,107 161,458 
For diluted earnings per share26,932,291 27,065,338 26,892,230 27,083,986 
(Loss) / earnings per share using weighted average number of ordinary shares outstanding(1):
Basic (loss) / earnings per ordinary share for continuing operations$(0.01)$0.18 $0.09 $0.20 
Basic loss per ordinary share for discontinued operations(0.01)(0.01)(0.01)(0.01)
Basic (loss) / earnings per ordinary share$(0.02)$0.17 $0.08 $0.19 
Diluted (loss) / earnings per ordinary share for continuing operations$(0.01)$0.18 $0.09 $0.20 
Diluted loss per ordinary share for discontinued operations— (0.01)(0.01)(0.01)
Diluted (loss) / earnings per ordinary share$(0.02)$0.17 $0.08 $0.19 
(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 period may not equal the earnings-per-share amount in total