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Earnings per share (Details)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 27, 2022
USD ($)
$ / shares
shares
Mar. 28, 2021
USD ($)
$ / shares
shares
Mar. 27, 2022
£ / shares
Mar. 28, 2021
£ / shares
Basic earnings:        
Net income from continuing operations | $ $ 7.7 $ 8.6    
Net (loss) / income from discontinued operations | $ (0.1) 5.9    
Net income | $ $ 7.6 $ 14.5    
Weighted average number of £0.50 ordinary shares:        
For basic earnings per share (shares) | shares [1] 27,490,741 27,658,871    
Dilutive effect of potential common stock (shares) | shares 205,377 398,452    
For diluted earnings per share (shares) | shares [1] 27,696,118 28,057,323    
Earnings / (loss) per share using weighted average number of ordinary shares outstanding        
Basic earnings per ordinary share for continuing operations (usd per share) [1] $ 0.28 $ 0.31    
Basic (loss) / earnings per ordinary share from discontinued operations (usd per share) [1] 0 0.21    
Basic (usd per share) [1] 0.28 0.52    
Diluted earnings per ordinary share for continuing activities (usd per share) [1] 0.28 0.31    
Diluted (loss) / earnings per ordinary share for discontinued operations (usd per share) [1] 0 0.21    
Diluted (usd per share) [1] 0.28 0.52    
Ordinary shares        
Basic earnings:        
Common stock, par value (in GBP per share) | (per share) $ 0.50 $ 0.50 £ 0.50 £ 0.50
[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.In the first quarter of 2022, basic average shares outstanding and diluted average shares outstanding were the same for discontinued operations because the effect of potential shares of common stock was anti-dilutive since the Company generated a net loss from discontinued operations.