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Earnings per share (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2022
USD ($)
$ / shares
Sep. 25, 2022
USD ($)
$ / shares
Jun. 26, 2022
USD ($)
$ / shares
Mar. 27, 2022
USD ($)
$ / shares
Dec. 31, 2021
USD ($)
$ / shares
Sep. 26, 2021
USD ($)
$ / shares
Jun. 27, 2021
USD ($)
$ / shares
Mar. 28, 2021
USD ($)
$ / shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2022
£ / shares
Dec. 31, 2021
£ / shares
Basic earnings:                          
Net income from continuing operations | $ $ 6.2 $ 8.5 $ 9.6 $ 7.7 $ 3.5 $ 6.0 $ 11.9 $ 8.6 $ 32.0 $ 30.0 $ 20.8    
Net loss from discontinued operations | $                 (5.1) (0.1) (0.8)    
Net income | $                 $ 26.9 $ 29.9 $ 20.0    
Weighted average number of £0.50 ordinary shares:                          
For basic earnings per share (in shares) | shares                 27,304,847 27,698,691 27,557,219    
Dilutive effect of potential common stock (in shares) | shares                 236,355 333,815 414,163    
For diluted earnings per share (in shares) | shares                 27,541,202 28,032,506 27,971,382    
Earnings per share using weighted average number of ordinary shares outstanding:                          
Basic earnings per ordinary share for continuing operations (in usd per share) $ 0.23 $ 0.31 $ 0.35 $ 0.28 $ 0.13 $ 0.22 $ 0.43 $ 0.31 $ 1.17 [1] $ 1.08 [1] $ 0.75 [1]    
Basic earnings / (loss) per ordinary share for discontinued operations (in usd per share) [1]                 (0.19) 0 (0.03)    
Basic earnings per ordinary share (in usd per share) [1]                 0.99 1.08 0.73    
Diluted earnings per ordinary share for continuing operations (in usd per share) 0.23 $ 0.31 $ 0.35 $ 0.28 0.13 $ 0.21 $ 0.42 $ 0.31 1.16 [1] 1.07 [1] 0.74 [1]    
Diluted earnings / (loss) per ordinary share for discontinued operations (in usd per share) [1]                 (0.19) 0 (0.03)    
Diluted earnings per ordinary share (in usd per share) [1]                 0.98 1.07 0.72    
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 £ 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.