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Earnings per share (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 28, 2020
USD ($)
$ / shares
shares
Mar. 29, 2020
USD ($)
Jun. 30, 2019
USD ($)
$ / shares
shares
Mar. 31, 2019
USD ($)
Jun. 28, 2020
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
$ / shares
shares
Jun. 28, 2020
£ / shares
Mar. 29, 2020
£ / shares
Dec. 31, 2019
£ / shares
Basic earnings:                  
Net income / (loss) | $ $ 4.1 $ 6.2 $ 3.5 $ (3.8) $ 10.3 $ (0.3)      
Weighted average number of €0.50 ordinary shares:                  
For basic earnings per share (in shares) 27,540,377   27,302,174   27,490,955 27,168,170      
Dilutive effect of potential common stock (in shares) 428,448   587,735   442,164 0      
For diluted earnings per share (in shares) 27,968,825   27,889,909   27,933,119 27,168,170      
Earnings / (loss) per share using weighted average number of ordinary shares outstanding:                  
Basic earnings / (loss) per ordinary share (in usd per share) | $ / shares $ 0.15   $ 0.13   $ 0.37 $ (0.01)      
Diluted earnings / (loss) per ordinary share (in usd per share) | $ / shares [1] $ 0.15   $ 0.13   $ 0.37 $ (0.01)      
Class of Stock [Line Items]                  
Shares not included in the computation of diluted EPS (in shares)         662,832        
Ordinary shares                  
Class of Stock [Line Items]                  
Common stock, par value (in EUR per share) | £ / shares             £ 0.50 £ 0.50 £ 0.50
[1] 1 The loss per share for 2019 year-to-date has not been diluted, since the incremental shares included in the weighted-average number of shares outstanding would have been anti-dilutive.