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Earnings per share (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 27, 2021
USD ($)
$ / shares
shares
Mar. 28, 2021
USD ($)
Jun. 28, 2020
USD ($)
$ / shares
shares
Mar. 29, 2020
USD ($)
Jun. 27, 2021
USD ($)
$ / shares
shares
Jun. 28, 2020
USD ($)
$ / shares
shares
Jun. 27, 2021
£ / shares
Jun. 27, 2021
€ / shares
Dec. 31, 2020
£ / shares
Jun. 28, 2020
€ / shares
Basic earnings:                    
Net income from continuing operations | $ $ 11.9   $ 4.6   $ 20.5 $ 11.8        
Net (loss) / income from discontinued operations | $ (0.9)   (0.5)   5.0 (1.5)        
Net income | $ $ 11.0 $ 14.5 $ 4.1 $ 6.2 $ 25.5 $ 10.3        
Weighted average number of €0.50 ordinary shares:                    
For basic earnings per share (in shares) | shares 27,771,983   27,540,377   27,717,025 27,490,955        
Dilutive effect of potential common stock (in shares) | shares 359,802   428,448   378,763 442,164        
For diluted earnings per share (in shares) | shares 28,131,785   27,968,825   28,095,788 27,933,119        
Earnings / (loss) per share using weighted average number of ordinary shares outstanding3:                    
Basic earnings per ordinary share for continuing operations (usd per share) [1] $ 0.43   $ 0.17   $ 0.74 $ 0.43        
Basic (loss)/earnings per ordinary share for discontinued operations (usd per share) [1],[2] (0.03)   (0.02)   0.18 (0.05)        
Basic (usd per share) [1] 0.40   0.15   0.92 0.37        
Diluted earnings per ordinary share for continuing operations (usd per share) 0.42   0.16   0.73 0.42        
Diluted (loss)/earnings per ordinary share for discontinued operations (usd per share) [2] (0.03)   (0.02)   0.18 (0.05)        
Diluted (usd per share) $ 0.39   $ 0.15   $ 0.91 $ 0.37        
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
[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 2021 and Second quarter and 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.