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Earnings per share (Tables)
 3 Months Ended
Mar. 27, 2022
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share
Basic and diluted earnings per share were calculated as follows:
First Quarter
In millions except share and per-share data20222021
Basic earnings:
Net income from continuing operations$7.7 $8.6 
Net (loss) / income from discontinued operations(0.1)5.9 
Net income $7.6 $14.5 
Weighted average number of £0.50 ordinary shares:
For basic earnings per share27,490,741 27,658,871 
Dilutive effect of potential common stock205,377 398,452 
For diluted earnings per share27,696,118 28,057,323 
Earnings / (loss) per share using weighted average number of ordinary shares outstanding:(1)
Basic earnings per ordinary share for continuing operations$0.28 $0.31 
Basic (loss) / earnings per ordinary share for discontinued operations$— $0.21 
Basic earnings per ordinary share$0.28 $0.52 
Diluted earnings per ordinary share for continuing activities$0.28 $0.31 
Diluted (loss) / earnings per ordinary share for discontinued operations$— $0.21 
Diluted earnings per ordinary share$0.28 $0.52 

(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.