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Earnings per share (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 26, 2022
USD ($)
$ / shares
shares
Mar. 27, 2022
USD ($)
Jun. 27, 2021
USD ($)
$ / shares
shares
Mar. 28, 2021
USD ($)
Jun. 26, 2022
USD ($)
$ / shares
shares
Jun. 27, 2021
USD ($)
$ / shares
shares
Jun. 26, 2022
£ / shares
Dec. 31, 2021
£ / shares
Basic earnings:                
Net income from continuing operations | $ $ 9.6   $ 11.9   $ 17.3 $ 20.5    
Net (loss) / income from discontinued operations | $ (0.3)   (0.9)   (0.4) 5.0    
Net income | $ $ 9.3 $ 7.6 $ 11.0 $ 14.5 $ 16.9 $ 25.5    
Weighted average number of £0.50 ordinary shares:                
For basic earnings per share (in shares) | shares 27,428,579   27,771,983   27,458,980 27,717,025    
Dilutive effect of potential common stock (in shares) | shares 274,638   359,802   261,085 378,763    
For diluted earnings per share (in shares) | shares 27,703,217   28,131,785   27,720,065 28,095,788    
Earnings / (loss) per share using weighted average number of ordinary shares outstanding                
Basic earnings per ordinary share for continuing operations (usd per share) [1] $ 0.35   $ 0.43   $ 0.63 $ 0.74    
Basic (loss)/earnings per ordinary share for discontinued operations (usd per share) [1],[2] (0.01)   (0.03)   (0.01) 0.18    
Basic (usd per share) [1] 0.34   0.40   0.62 0.92    
Diluted earnings per ordinary share for continuing operations (usd per share) [1] 0.35   0.42   0.62 0.73    
Diluted (loss)/earnings per ordinary share for discontinued operations (usd per share) [1],[2] (0.01)   (0.03)   (0.01) 0.18    
Diluted (usd per share) [1] 0.34   0.39   0.61 0.91    
Ordinary shares                
Class of Stock [Line Items]                
Common stock, par value (in EUR per share) | (per share) $ 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 period may not equal the earnings-per-share amount in total.
[2] The loss per share for discontinued operations in the Second Quarter of 2022 and 2021 and year-to-date of 2022 has not been diluted, since the incremental shares included in the weighted-average number of shares outstanding would have been anti-dilutive.