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Earnings per share (Tables)
 3 Months Ended
Apr. 02, 2023
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 data20232022
Basic earnings:
Net income from continuing operations$0.5 $7.7 
Net income / (loss) from discontinued operations— (0.1)
Net income$0.5 $7.6 
Weighted average number of £0.50 ordinary shares:
For basic earnings per share26,921,010 27,490,741 
Dilutive effect of potential common stock150,484 205,377 
For diluted earnings per share27,071,494 27,696,118 
Earnings / (loss) per share using weighted average number of ordinary shares outstanding(1):
Basic earnings per ordinary share for continuing operations$0.02 $0.28 
Basic earnings / (loss) per ordinary share for discontinued operations— — 
Basic earnings per ordinary share$0.02 $0.28 
Diluted earnings per ordinary share for continuing operations$0.02 $0.28 
Diluted earnings / (loss) per ordinary share for discontinued operations— — 
Diluted earnings per ordinary share$0.02 $0.28 
(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