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Earnings per share (Details) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 28, 2021 USD ($) $ / shares shares	Mar. 29, 2020 USD ($) $ / shares shares	Mar. 28, 2021 £ / shares	Mar. 29, 2020 £ / shares
Basic earnings:
Net income from continuing operations | $	$ 8.6	$ 7.2
Net income / ( loss) from discontinued operations | $	5.9	(1.0)
Net income | $	$ 14.5	$ 6.2
Weighted average number of £0.50 ordinary shares:
For basic earnings per share (shares) | shares	27,658,871	27,440,423
Dilutive effect of potential common stock (shares) | shares	398,452	453,635
For diluted earnings per share (shares) | shares	28,057,323	27,894,058
Earnings / (loss) per share using weighted average number of ordinary shares outstanding
Basic earnings per ordinary share for continuing operations (usd per share)	$ 0.31	$ 0.26
Basic earnings / (loss) per ordinary share from discontinued operations	0.21	(0.04)
Basic (usd per share)	0.52	0.23
Diluted earnings per ordinary share for continuing activities (usd per share)	0.31	0.26
Diluted earnings / (loss) per ordinary share for discontinued operations (usd per share)	0.21	(0.04)
Diluted (usd per share)	0.52	$ 0.22
Class of Stock [Line Items]
Shares not included in the computation of diluted EPS (in shares) | shares		453,635
Ordinary shares
Class of Stock [Line Items]
Common stock, par value (in GBP per share) | (per share)	$ 0.50	$ 0.50	£ 0.50	£ 0.50

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