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Earnings per share (Details)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 30, 2025
USD ($)
$ / shares
shares
Mar. 31, 2024
USD ($)
$ / shares
shares
Mar. 30, 2025
£ / shares
Dec. 31, 2024
£ / shares
Basic earnings:        
Net income from continuing operations | $ $ 5.5 $ 2.8    
Net loss from discontinued operations | $ 0.0 (0.1)    
Net income | $ $ 5.5 $ 2.7    
Common stock, par value (in GBP per share) | £ / shares     £ 0.50 £ 0.50
Weighted average number of £0.50 ordinary shares:        
For basic earnings per share (in shares) | shares 26,733,252 26,820,968    
Dilutive effect of potential common stock (in shares) | shares 398,485 46,008    
For diluted earnings per share (in shares) | shares 27,131,737 26,866,976    
Earnings / (loss) per share using weighted average number of ordinary shares outstanding        
Basic earnings per ordinary share for continuing operations (in USD per share) [1] $ 0.21 $ 0.10    
Basic loss per ordinary share for discontinued operations (in USD per share) [1],[2] 0 0    
Basic earnings per ordinary share (in USD per share) [1] 0.21 0.10    
Diluted earnings per ordinary share for continuing operations (in USD per share) [1] 0.20 0.10    
Diluted loss per ordinary share for discontinued operations (in USD per share) [1],[2] 0 0    
Diluted earnings per ordinary share (in USD per share) [1] 0.20 0.10    
Ordinary shares        
Basic earnings:        
Common stock, par value (in GBP per share) $ 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 2025 and 2024 has not been diluted, since the incremental shares included in the weighted-average number of shares outstanding would have been anti-dilutive.