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Earnings per share (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
USD ($)
$ / shares
shares
Mar. 31, 2024
USD ($)
Jul. 02, 2023
USD ($)
$ / shares
shares
Apr. 02, 2023
USD ($)
Jun. 30, 2024
USD ($)
$ / shares
shares
Jul. 02, 2023
USD ($)
$ / shares
shares
Jun. 30, 2024
£ / shares
Dec. 31, 2023
£ / shares
Jul. 02, 2023
£ / shares
Basic (loss) / earnings:                  
Net (loss) / income from continuing operations | $ $ (0.4)   $ 4.9   $ 2.4 $ 5.4      
Net loss from discontinued operations | $ (0.1)   (0.2)   (0.2) (0.2)      
Net (loss) / income | $ $ (0.5) $ 2.7 $ 4.7 $ 0.5 $ 2.2 $ 5.2      
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 26,831,372   26,923,804   26,826,123 26,922,528      
Dilutive effect of potential common stock (in shares) | shares 100,919   141,534   66,107 161,458      
For diluted earnings per share (in shares) | shares 26,932,291   27,065,338   26,892,230 27,083,986      
(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] $ (0.01)   $ 0.18   $ 0.09 $ 0.20      
Basic earnings /(loss) per ordinary share for discontinued operations (usd per share) [1],[2] (0.01)   (0.01)   (0.01) (0.01)      
Basic (usd per share) [1] (0.02)   0.17   0.08 0.19      
Diluted (loss) / earnings per ordinary share for continuing operations (usd per share) [1] (0.01)   0.18   0.09 0.20      
Diluted earnings / (loss) per ordinary share for discontinued operations (usd per share) [1],[2] 0   (0.01)   (0.01) (0.01)      
Diluted (usd per share) [1] $ (0.02)   $ 0.17   $ 0.08 $ 0.19      
Ordinary shares                  
Basic (loss) / earnings:                  
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.