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Earnings per share Earnings per share (Details) $ / shares in Units, $ in Millions		3 Months Ended
		Mar. 31, 2019 USD ($) $ / shares shares	Apr. 01, 2018 USD ($) $ / shares shares	Mar. 31, 2019 £ / shares	Dec. 31, 2018 £ / shares	Apr. 01, 2018 £ / shares
Basic earnings:
Net (loss) / income | $		$ (3.8)	$ 9.9
Weighted average number of £0.50 ordinary shares:
For basic earnings per share (shares)		27,032,677	26,512,765
Dilutive effect of potential common stock (shares)		0	385,118
For diluted earnings per share (shares)		27,032,677	26,897,883
(Loss) / earnings per share using weighted average number of ordinary shares outstanding:
Basic earnings per ordinary share (usd per share) | $ / shares		$ (0.14)	$ 0.37
Diluted earnings per ordinary share (usd per share) | $ / shares	[1]	$ (0.14)	$ 0.37
Class of Stock [Line Items]
Shares not included in the computation of diluted EPS (in shares)		735,730
Ordinary shares
Class of Stock [Line Items]
Common stock, par value (in GBP per share) | £ / shares				£ 0.50	£ 0.50	£ 0.50
[1] The loss per share

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