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Earnings per share (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 28, 2025
USD ($)
$ / shares
shares
Jun. 29, 2025
USD ($)
Mar. 30, 2025
USD ($)
Sep. 29, 2024
USD ($)
$ / shares
shares
Jun. 30, 2024
USD ($)
Mar. 31, 2024
USD ($)
Sep. 28, 2025
USD ($)
$ / shares
shares
Sep. 29, 2024
USD ($)
$ / shares
shares
Sep. 28, 2025
£ / shares
Dec. 31, 2024
£ / shares
Sep. 29, 2024
£ / shares
Basic earnings / (loss):                      
Net income from continuing operations | $ $ 2.5     $ 12.6     $ 13.0 $ 15.0      
Net income / (loss) from discontinued operations | $ 0.2     0.1     (2.2) (0.1)      
Net income | $ $ 2.7 $ 2.6 $ 5.5 $ 12.7 $ (0.5) $ 2.7 $ 10.8 $ 14.9      
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 26,746,390     26,808,401     26,743,059 26,820,280      
Dilutive effect of potential common stock (in shares) | shares 412,634     124,010     446,397 140,845      
For diluted earnings per share (in shares) | shares 27,159,024     26,932,411     27,189,456 26,961,125      
(Loss) / earnings per share using weighted average number of ordinary shares outstanding                      
Basic (loss) / earnings per ordinary share for continuing operations (usd per share) [1] $ 0.09     $ 0.47     $ 0.49 $ 0.56      
Basic earnings /(loss) per ordinary share for discontinued operations (usd per share) [1],[2] 0.01     0     (0.08) 0      
Basic (usd per share) [1] 0.10     0.47     0.41 0.56      
Diluted (loss) / earnings per ordinary share for continuing operations (usd per share) [1] 0.09     0.47     0.48 0.56      
Diluted earnings / (loss) per ordinary share for discontinued operations (usd per share) [1],[2] 0.01     0     (0.08) 0      
Diluted (usd per share) [1] $ 0.10     $ 0.47     $ 0.40 $ 0.55      
Ordinary shares                      
Basic earnings / (loss):                      
Common stock, par value (in GBP per share) | £ / shares                 £ 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 has not been diluted, since the incremental shares included in the weighted-average number of shares outstanding would have been anti-dilutive.