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Earnings per share (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
Sep. 27, 2020
USD ($)
$ / shares
Jun. 28, 2020
USD ($)
$ / shares
Mar. 29, 2020
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
$ / shares
Sep. 29, 2019
USD ($)
$ / shares
Jun. 30, 2019
USD ($)
$ / shares
Mar. 31, 2019
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2020
£ / shares
Dec. 31, 2019
£ / shares
Basic earnings:                          
Net income from continuing operations | $ $ 6.6 $ 2.4 $ 4.6 $ 7.2 $ 1.6 $ 6.3 $ 4.1 $ (3.3) $ 20.8 $ 8.7 $ 27.7    
Net loss from discontinued operations | $                 (0.8) (5.6) (2.7)    
Net income | $                 $ 20.0 $ 3.1 $ 25.0    
Weighted average number of £0.50 ordinary shares:                          
For basic earnings per share (in shares) | shares                 27,557,219 27,289,042 26,708,469    
Dilutive effect of potential common stock (in shares) | shares                 414,163 593,822 983,793    
For diluted earnings per share (in shares) | shares                 27,971,382 27,882,864 27,692,262    
Earnings Per Share, Basic, Two Class Method [Abstract]                          
Basic earnings per ordinary share for continuing operations (in usd per share) $ 0.24 $ 0.09 $ 0.17 $ 0.26 $ 0.06 $ 0.23 $ 0.15 $ (0.12) $ 0.75 [1] $ 0.32 [1] $ 1.04 [1]    
Basic loss per ordinary share for discontinued operations (in usd per share) [1]                 (0.03) (0.21) (0.10)    
Basic earnings per ordinary share (in usd per share) [1]                 0.73 0.11 0.94    
Diluted earnings per ordinary share for continuing operations (in usd per share) $ 0.24 $ 0.09 $ 0.16 $ 0.26 $ 0.06 $ 0.23 $ 0.15 $ (0.12) 0.74 [1] 0.31 [1] 1.00 [1]    
Diluted loss per ordinary share for discontinued operations (in usd per share) [1]                 (0.03) (0.21) (0.10)    
Diluted earnings per ordinary share (in usd per share) [1]                 $ 0.72 $ 0.11 $ 0.90    
Ordinary shares                          
Class of Stock [Line Items]                          
Common stock, par value (in GBP per share) | £ / shares                       £ 0.50 £ 0.50
[1] (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 year may not equal the earnings-per-share amount in total.