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Earnings per share (Tables)
 9 Months Ended
Oct. 01, 2023
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 data2023202220232022
Basic (loss) / earnings:
Net (loss) / income from continuing operations$(1.5)$8.5 $3.9 $25.8 
Net income / (loss) from discontinued operations0.2 (0.5)— (0.9)
Net (loss) / income$(1.3)$8.0 $3.9 $24.9 
Weighted average number of £0.50 ordinary shares:
For basic earnings per share26,895,968 27,295,862 26,913,771 27,403,844 
Dilutive effect of potential common stock120,405 229,452 158,654 249,042 
For diluted earnings per share27,016,373 27,525,314 27,072,425 27,652,886 
(Loss) / earnings per share using weighted average number of ordinary shares outstanding(1):
Basic (loss) / earnings per ordinary share for continuing operations$(0.06)$0.31 $0.14 $0.94 
Basic earnings / (loss) per ordinary share for discontinued operations0.01 (0.02)— (0.03)
Basic (loss) / earnings per ordinary share$(0.05)$0.29 $0.14 $0.91 
Diluted (loss) / earnings per ordinary share for continuing operations$(0.06)$0.31 $0.14 $0.93 
Diluted earnings / (loss) per ordinary share for discontinued operations0.01 (0.02)— (0.03)
Diluted (loss) / earnings per ordinary share$(0.05)$0.29 $0.14 $0.90 
(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