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Earnings per share (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Oct. 01, 2023
USD ($)
$ / shares
shares
Jul. 02, 2023
USD ($)
Apr. 02, 2023
USD ($)
Sep. 25, 2022
USD ($)
$ / shares
shares
Jun. 26, 2022
USD ($)
Mar. 27, 2022
USD ($)
Oct. 01, 2023
USD ($)
$ / shares
shares
Sep. 25, 2022
USD ($)
$ / shares
shares
Oct. 01, 2023
£ / shares
Dec. 31, 2022
£ / shares
Sep. 25, 2022
£ / shares
Basic (loss) / earnings:                      
Net (loss) / income from continuing operations | $ $ (1.5)     $ 8.5     $ 3.9 $ 25.8      
Net income / (loss) from discontinued operations | $ 0.2     (0.5)     0.0 (0.9)      
Net (loss) / income | $ $ (1.3) $ 4.7 $ 0.5 $ 8.0 $ 9.3 $ 7.6 $ 3.9 $ 24.9      
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 26,895,968     27,295,862     26,913,771 27,403,844      
Dilutive effect of potential common stock (in shares) | shares 120,405     229,452     158,654 249,042      
For diluted earnings per share (in shares) | shares 27,016,373     27,525,314     27,072,425 27,652,886      
(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],[2] $ (0.06)     $ 0.31     $ 0.14 $ 0.94      
Basic earnings /(loss) per ordinary share for discontinued operations (usd per share) [1],[2] 0.01     (0.02)     0 (0.03)      
Basic (usd per share) [2] (0.05)     0.29     0.14 0.91      
Diluted (loss) / earnings per ordinary share for continuing operations (usd per share) [1],[2] (0.06)     0.31     0.14 0.93      
Diluted earnings / (loss) per ordinary share for discontinued operations (usd per share) [1],[2] 0.01     (0.02)     0 (0.03)      
Diluted (usd per share) [2] $ (0.05)     $ 0.29     $ 0.14 $ 0.90      
Ordinary shares                      
Basic (loss) / earnings:                      
Common stock, par value (in GBP per share) | £ / shares                 £ 0.50   £ 0.50
[1] The loss per share for the third quarter of 2023 for continuing operations and the third quarter of 2022 and 2022 year-to-date 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.
[2] 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.