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Earnings / (loss) per share (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 29, 2024
USD ($)
$ / shares
shares
Jun. 30, 2024
USD ($)
Mar. 31, 2024
USD ($)
Oct. 01, 2023
USD ($)
$ / shares
shares
Jul. 02, 2023
USD ($)
Apr. 02, 2023
USD ($)
Sep. 29, 2024
USD ($)
$ / shares
shares
Oct. 01, 2023
USD ($)
$ / shares
shares
Sep. 29, 2024
£ / shares
Dec. 31, 2023
£ / shares
Oct. 01, 2023
£ / shares
Basic earnings / (loss):                      
Net income / (loss) from continuing operations | $ $ 12.6     $ (1.5)     $ 15.0 $ 3.9      
Net income / (loss) from discontinued operations | $ 0.1     0.2     (0.1) 0.0      
Net income / (loss) | $ $ 12.7 $ (0.5) $ 2.7 $ (1.3) $ 4.7 $ 0.5 $ 14.9 $ 3.9      
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 26,808,401     26,895,968     26,820,280 26,913,771      
Dilutive effect of potential common stock (in shares) | shares 124,010     120,405     140,845 158,654      
For diluted earnings per share (in shares) | shares 26,932,411     27,016,373     26,961,125 27,072,425      
Earnings / (loss) per share using weighted average number of ordinary shares outstanding                      
Basic earnings / (loss) per ordinary share for continuing operations (usd per share) [1] $ 0.47     $ (0.06)     $ 0.56 $ 0.14      
Basic earnings / (loss) per ordinary share for discontinued operations (usd per share) [1],[2] 0     0.01     0 0      
Basic (usd per share) [1] 0.47     (0.05)     0.56 0.14      
Diluted earnings / (loss) per ordinary share for continuing operations (usd per share) [1] 0.47     (0.06)     0.56 0.14      
Diluted earnings / (loss) per ordinary share for discontinued operations (usd per share) [1],[2] 0     0.01     0 0      
Diluted (usd per share) [1] $ 0.47     $ (0.05)     $ 0.55 $ 0.14      
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 continuing operations for the third quarter of 2023 and for discontinued operations for first nine months of 2024, has not been diluted since the incremental shares included in the weighted-average number of shares outstanding would have been anti-dilutive.