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Earnings per share (Details) $ / shares in Units, $ in Millions	3 Months Ended						9 Months Ended
	Sep. 29, 2019 USD ($) $ / shares shares	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Sep. 30, 2018 USD ($) $ / shares shares	Jul. 01, 2018 USD ($)	Apr. 01, 2018 USD ($)	Sep. 29, 2019 USD ($) $ / shares shares	Sep. 30, 2018 USD ($) $ / shares shares	Sep. 29, 2019 £ / shares	Dec. 31, 2018 £ / shares	Sep. 30, 2018 £ / shares
Basic earnings:
Net income | $	$ 5.8	$ 3.5	$ (3.8)	$ 12.2	$ 11.4	$ 9.9	$ 5.5	$ 33.5
Weighted average number of £0.50 ordinary shares:
For basic earnings per share (in shares)	27,393,743			26,773,064			27,243,638	26,614,646
Dilutive effect of potential common stock (in shares)	475,673			884,029			599,887	892,881
For diluted earnings per share (in shares)	27,869,416			27,657,093			27,843,525	27,507,527
Earnings per share using weighted average number of ordinary shares outstanding:
Basic earnings / (loss) per ordinary share (in usd per share) | $ / shares	$ 0.21			$ 0.46			$ 0.20	$ 1.26
Diluted earnings / (loss) per ordinary share (in usd per share) | $ / shares	$ 0.21			$ 0.44			$ 0.20	$ 1.22
Ordinary shares
Class of Stock [Line Items]
Common stock, par value (in GBP per share) | £ / shares									£ 0.50	£ 0.50	£ 0.50

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