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Earnings per share (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 25, 2022
USD ($)
$ / shares
shares
Jun. 26, 2022
USD ($)
Mar. 27, 2022
USD ($)
Sep. 26, 2021
USD ($)
$ / shares
shares
Jun. 27, 2021
USD ($)
Mar. 28, 2021
USD ($)
Sep. 25, 2022
USD ($)
$ / shares
shares
Sep. 26, 2021
USD ($)
$ / shares
shares
Sep. 25, 2022
£ / shares
Dec. 31, 2021
£ / shares
Basic earnings:                    
Net income from continuing operations | $ $ 8.5     $ 6.0     $ 25.8 $ 26.5    
Net (loss) / income from discontinued operations | $ (0.5)     (1.2)     (0.9) 3.8    
Net income | $ $ 8.0 $ 9.3 $ 7.6 $ 4.8 $ 11.0 $ 14.5 $ 24.9 $ 30.3    
Weighted average number of £0.50 ordinary shares:                    
For basic earnings per share (in shares) | shares 27,295,862     27,722,472     27,403,844 27,718,874    
Dilutive effect of potential common stock (in shares) | shares 229,452     311,260     249,042 353,281    
For diluted earnings per share (in shares) | shares 27,525,314     28,033,732     27,652,886 28,072,155    
Earnings / (loss) per share using weighted average number of ordinary shares outstanding                    
Basic earnings per ordinary share for continuing operations (usd per share) [1] $ 0.31     $ 0.22     $ 0.94 $ 0.96    
Basic (loss)/earnings per ordinary share for discontinued operations (usd per share) [1],[2] (0.02)     (0.04)     (0.03) 0.14    
Basic (usd per share) [1] 0.29     0.17     0.91 1.09    
Diluted earnings per ordinary share for continuing operations (usd per share) [1] 0.31     0.21     0.93 0.94    
Diluted (loss)/earnings per ordinary share for discontinued operations (usd per share) [1],[2] (0.02)     (0.04)     (0.03) 0.14    
Diluted (usd per share) [1] 0.29     0.17     0.90 1.08    
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 Third 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.