XML 50 R39.htm IDEA: XBRL DOCUMENT v3.20.2
Earnings per share (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 27, 2020
USD ($)
$ / shares
shares
Jun. 28, 2020
USD ($)
Mar. 29, 2020
USD ($)
Sep. 29, 2019
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Sep. 27, 2020
USD ($)
$ / shares
shares
Sep. 29, 2019
USD ($)
$ / shares
shares
Sep. 27, 2020
£ / shares
Dec. 31, 2019
£ / shares
Basic earnings:                    
Net income | $ $ 2.6 $ 4.1 $ 6.2 $ 5.8 $ 3.5 $ (3.8) $ 12.9 $ 5.5    
Weighted average number of £0.50 ordinary shares:                    
For basic earnings per share (in shares) 27,619,298     27,393,743     27,532,823 27,243,638    
Dilutive effect of potential common stock (in shares) 394,408     475,673     426,119 599,887    
For diluted earnings per share (in shares) 28,013,706     27,869,416     27,958,942 27,843,525    
Earnings per share using weighted average number of ordinary shares outstanding:                    
Basic earnings / (loss) per ordinary share (in usd per share) | $ / shares $ 0.09     $ 0.21     $ 0.47 $ 0.20    
Diluted earnings / (loss) per ordinary share (in usd per share) | $ / shares $ 0.09     $ 0.21     $ 0.46 $ 0.20    
Ordinary shares                    
Class of Stock [Line Items]                    
Common stock, par value (in EUR per share) | £ / shares                 £ 0.50 £ 0.50