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Earnings per share (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
$ / shares
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Dec. 31, 2024
£ / shares
Dec. 31, 2023
£ / shares
Class of Stock [Line Items]          
Common stock, par value (in GBP per share) | £ / shares       £ 0.50 £ 0.50
Basic (loss) / earnings:          
Net income / (loss) from continuing operations | $ $ 18.3 $ (2.6) $ 32.0    
Net (loss) / income from discontinued operations | $ 0.1 0.7 (5.1)    
Net income / (loss) | $ $ 18.4 $ (1.9) $ 26.9    
Weighted average number of £0.50 ordinary shares:          
For basic earnings / (loss) per share (in shares) | shares 26,804,873 26,897,556 27,304,847    
Dilutive effect of potential common stock (in shares) | shares 279,028 123,403 236,355    
For diluted earnings / (loss) per share (in shares) | shares 27,083,901 27,020,959 27,541,202    
Earnings / (loss) per share using weighted average number of ordinary shares outstanding:          
Basic earnings / (loss) from continuing operations (in USD per share) [1] $ 0.68 $ (0.10) $ 1.17    
Basic (loss) / earnings per ordinary share for discontinued operations (in USD per share) [1] 0 0.03 (0.19)    
Basic earnings / (loss) per ordinary share (in USD per share) [1] 0.69 (0.07) 0.99    
Diluted earnings / (loss) per ordinary share for continuing operations (in USD per share) [1] 0.68 (0.10) 1.16    
Diluted (loss) / earnings per ordinary share for discontinued operations (in USD per share) [1] 0 0.03 (0.19)    
Diluted earnings / (loss) per ordinary share (in USD per share) [1] 0.68 (0.07) 0.98    
Ordinary shares          
Class of Stock [Line Items]          
Common stock, par value (in GBP per share) | (per share) $ 0.50 $ 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 year may not equal the earnings-per-share amount in total.