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Earnings per share (Tables)
 9 Months Ended
Sep. 25, 2022
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 data2022202120222021
Basic earnings:
Net income from continuing operations$8.5 $6.0 $25.8 $26.5 
Net (loss) / income from discontinued operations(0.5)(1.2)(0.9)3.8 
Net income$8.0 $4.8 $24.9 $30.3 
Weighted average number of £0.50 ordinary shares:
For basic earnings per share27,295,862 27,722,472 27,403,844 27,718,874 
Dilutive effect of potential common stock229,452 311,260 249,042 353,281 
For diluted earnings per share27,525,314 28,033,732 27,652,886 28,072,155 
Earnings / (loss) per share using weighted average number of ordinary shares outstanding(1):
Basic earnings per ordinary share for continuing operations$0.31 $0.22 $0.94 $0.96 
Basic (loss) / earnings per ordinary share for discontinued operations(0.02)(0.04)(0.03)0.14 
Basic earnings per ordinary share$0.29 $0.17 $0.91 $1.09 
Diluted earnings per ordinary share for continuing operations$0.31 $0.21 $0.93 $0.94 
Diluted (loss) / earnings per ordinary share for discontinued operations(0.02)(0.04)(0.03)0.14 
Diluted earnings per ordinary share$0.29 $0.17 $0.90 $1.08 
(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