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Earnings per share (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 26, 2021
USD ($)
$ / shares
shares
Jun. 27, 2021
USD ($)
Mar. 28, 2021
USD ($)
Sep. 27, 2020
USD ($)
$ / shares
shares
Jun. 28, 2020
USD ($)
Mar. 29, 2020
USD ($)
Sep. 26, 2021
USD ($)
$ / shares
shares
Sep. 27, 2020
USD ($)
$ / shares
shares
Sep. 26, 2021
£ / shares
Dec. 31, 2020
£ / shares
Sep. 27, 2020
£ / shares
Basic earnings:                      
Net income from continuing operations | $ $ 6.0     $ 2.4     $ 26.5 $ 14.2      
Net (loss) / income from discontinued operations | $ (1.2)     0.2     3.8 (1.3)      
Net income | $ $ 4.8 $ 11.0 $ 14.5 $ 2.6 $ 4.1 $ 6.2 $ 30.3 $ 12.9      
Weighted average number of £0.50 ordinary shares:                      
For basic earnings per share (in shares) | shares 27,722,472     27,619,298     27,718,874 27,532,823      
Dilutive effect of potential common stock (in shares) | shares 311,260     394,408     353,281 426,119      
For diluted earnings per share (in shares) | shares 28,033,732     28,013,706     28,072,155 27,958,942      
Earnings / (loss) per share using weighted average number of ordinary shares outstanding:                      
Basic earnings per ordinary share for continuing operations (usd per share) [1] $ 0.22     $ 0.09     $ 0.96 $ 0.52      
Basic (loss)/earnings per ordinary share for discontinued operations (usd per share) [1],[2] (0.04)     0.01     0.14 (0.05)      
Basic (usd per share) [1] 0.17     0.09     1.09 0.47      
Diluted earnings per ordinary share for continuing operations (usd per share) 0.21     0.09     0.94 0.51      
Diluted (loss)/earnings per ordinary share for discontinued operations (usd per share) [2] (0.04)     0.01     0.14 (0.05)      
Diluted (usd per share) $ 0.17     $ 0.09     $ 1.08 $ 0.46      
Ordinary shares                      
Class of Stock [Line Items]                      
Common stock, par value (in EUR per share) | £ / shares                 £ 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 2021 and the year-to-date of 2020 has not been diluted, since the incremental shares included in the weighted-average number of shares outstanding would have been anti-dilutive.