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Earnings / (loss) per share (Tables)
 9 Months Ended
Sep. 29, 2024
Earnings Per Share [Abstract]  
Schedule of earnings per share
Basic and diluted earnings per share were calculated as follows:
Third QuarterYear-to-date
In millions except share and per-share data2024202320242023
Basic earnings / (loss):
Net income / (loss) from continuing operations$12.6 $(1.5)$15.0 $3.9 
Net income / (loss) from discontinued operations0.1 0.2 (0.1)— 
Net income / (loss)$12.7 $(1.3)$14.9 $3.9 
Weighted average number of £0.50 ordinary shares:
For basic earnings / (loss) per share26,808,401 26,895,968 26,820,280 26,913,771 
Dilutive effect of potential common stock124,010 120,405 140,845 158,654 
For diluted earnings / (loss) per share26,932,411 27,016,373 26,961,125 27,072,425 
Earnings / (loss) per share using weighted average number of ordinary shares outstanding(1):
Basic earnings / (loss) per ordinary share for continuing operations$0.47 $(0.06)$0.56 $0.14 
Basic earnings / (loss) per ordinary share for discontinued operations— 0.01 — — 
Basic earnings / (loss) per ordinary share$0.47 $(0.05)$0.56 $0.14 
Diluted earnings / (loss) per ordinary share for continuing operations$0.47 $(0.06)$0.56 $0.14 
Diluted earnings / (loss) per ordinary share for discontinued operations— 0.01 — — 
Diluted earnings / (loss) per ordinary share$0.47 $(0.05)$0.55 $0.14 
(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