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Earnings per share (Tables)
 6 Months Ended
Jun. 26, 2022
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share
Basic and diluted earnings per share were calculated as follows:
Second QuarterYear-to-date
In millions except share and per-share data2022202120222021
Basic earnings:
Net income from continuing operations$9.6 $11.9 $17.3 $20.5 
Net (loss) / income from discontinued operations(0.3)(0.9)(0.4)5.0 
Net income$9.3 $11.0 $16.9 $25.5 
Weighted average number of £0.50 ordinary shares:
For basic earnings per share27,428,579 27,771,983 27,458,980 27,717,025 
Dilutive effect of potential common stock274,638 359,802 261,085 378,763 
For diluted earnings per share27,703,217 28,131,785 27,720,065 28,095,788 
Earnings / (loss) per share using weighted average number of ordinary shares outstanding(1):
Basic earnings per ordinary share for continuing operations$0.35 $0.43 $0.63 $0.74 
Basic (loss) / earnings per ordinary share for discontinued operations(0.01)(0.03)(0.01)0.18 
Basic earnings per ordinary share$0.34 $0.40 $0.62 $0.92 
Diluted earnings per ordinary share for continuing operations$0.35 $0.42 $0.62 $0.73 
Diluted (loss) / earnings per ordinary share for discontinued operations(0.01)(0.03)(0.01)0.18 
Diluted earnings per ordinary share$0.34 $0.39 $0.61 $0.91 
(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