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Earnings per share (Details)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2024
USD ($)
$ / shares
shares
Apr. 02, 2023
USD ($)
$ / shares
shares
Mar. 31, 2024
£ / shares
Dec. 31, 2023
£ / shares
Basic earnings:        
Net income from continuing operations | $ $ 2.8 $ 0.5    
Net (loss) / income from discontinued operations | $ (0.1) 0.0    
Net income | $ $ 2.7 $ 0.5    
Weighted average number of £0.50 ordinary shares:        
For basic earnings per share (in shares) | shares 26,820,968 26,921,010    
Dilutive effect of potential common stock (in shares) | shares 46,008 150,484    
For diluted earnings per share (in shares) | shares 26,866,976 27,071,494    
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] $ 0.10 $ 0.02    
Basic earnings/(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] 0.10 0.02    
Diluted earnings per ordinary share for continuing operations (in USD per share) [1] 0.10 0.02    
Diluted earnings/(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] 0.10 0.02    
Ordinary shares        
Basic earnings:        
Common stock, par value (in GBP per share) | (per share) $ 0.50 $ 0.50 £ 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 2024 has not been diluted, since the incremental shares included in the weighted-average number of shares outstanding would have been anti-dilutive.