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Earnings per share (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2021
USD ($)
$ / shares
Sep. 26, 2021
USD ($)
$ / shares
Jun. 27, 2021
USD ($)
$ / shares
Mar. 28, 2021
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
$ / shares
Sep. 27, 2020
USD ($)
$ / shares
Jun. 28, 2020
USD ($)
$ / shares
Mar. 29, 2020
USD ($)
$ / shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2021
£ / shares
Dec. 31, 2020
£ / shares
Basic earnings:                          
Net income from continuing operations | $ $ 3.5 $ 6.0 $ 11.9 $ 8.6 $ 6.6 $ 2.4 $ 4.6 $ 7.2 $ 30.0 $ 20.8 $ 8.7    
Net loss from discontinued operations | $                 (0.1) (0.8) (5.6)    
Net income | $                 $ 29.9 $ 20.0 $ 3.1    
Weighted average number of £0.50 ordinary shares:                          
For basic earnings per share (in shares) | shares                 27,698,691 27,557,219 27,289,042    
Dilutive effect of potential common stock (in shares) | shares                 333,815 414,163 593,822    
For diluted earnings per share (in shares) | shares                 28,032,506 27,971,382 27,882,864    
Earnings per share using weighted average number of ordinary shares outstanding:                          
Basic earnings per ordinary share for continuing operations (in usd per share) $ 0.13 $ 0.22 $ 0.43 $ 0.31 $ 0.24 $ 0.09 $ 0.17 $ 0.26 $ 1.08 [1] $ 0.75 [1] $ 0.32 [1]    
Basic earnings / (loss) per ordinary share for discontinued operations (in usd per share) [1]                 0 (0.03) (0.21)    
Basic earnings per ordinary share (in usd per share) [1]                 1.08 0.73 0.11    
Diluted earnings per ordinary share for continuing operations (in usd per share) 0.13 $ 0.21 $ 0.42 $ 0.31 0.24 $ 0.09 $ 0.16 $ 0.26 1.07 [1] 0.74 [1] 0.31 [1]    
Diluted earnings / (loss) per ordinary share for discontinued operations (in usd per share) [1]                 0 (0.03) (0.21)    
Diluted earnings per ordinary share (in usd per share) [1]                 1.07 0.72 0.11    
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.