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Earnings per share (Details)
$ / shares in Units, $ in Millions
 3 Months Ended
Apr. 02, 2023
USD ($)
$ / shares
shares
Mar. 27, 2022
USD ($)
$ / shares
shares
Apr. 02, 2023
£ / shares
Dec. 31, 2022
£ / shares
Basic earnings:        
Net income from continuing operations | $ $ 0.5 $ 7.7    
Net income / (loss) from discontinued operations | $ 0.0 (0.1)    
Net income | $ $ 0.5 $ 7.6    
Weighted average number of £0.50 ordinary shares:        
For basic earnings per share (in shares) | shares 26,921,010 27,490,741    
Dilutive effect of potential common stock (in shares) | shares 150,484 205,377    
For diluted earnings per share (in shares) | shares 27,071,494 27,696,118    
Earnings / (loss) per share using weighted average number of ordinary shares outstanding        
Basic earnings per ordinary share for continuing operations (usd per share) [1] $ 0.02 $ 0.28    
Basic (loss)/earnings per ordinary share for discontinued operations (usd per share) [1],[2] 0 0    
Basic (usd per share) [1] 0.02 0.28    
Diluted earnings per ordinary share for continuing operations (usd per share) [1] 0.02 0.28    
Diluted (loss)/earnings per ordinary share for discontinued operations (usd per share) [1],[2] 0 0    
Diluted (usd per share) [1] 0.02 0.28    
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.
[2] The loss per share for discontinued operations in the First Quarter of 2022 has not been diluted, since the incremental shares included in the weighted-average number of shares outstanding would have been anti-dilutive.