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Earnings per share (Details) $ / shares in Units, $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2019 USD ($) $ / shares shares	Mar. 31, 2019 USD ($)	Jul. 01, 2018 USD ($) $ / shares shares	Apr. 01, 2018 USD ($)	Jun. 30, 2019 USD ($) $ / shares shares	Jul. 01, 2018 USD ($) $ / shares shares	Jun. 30, 2019 £ / shares	Dec. 31, 2018 £ / shares	Jul. 01, 2018 £ / shares
Basic earnings:
Net income / (loss) | $		$ 3.5	$ (3.8)	$ 11.4	$ 9.9	$ (0.3)	$ 21.3
Weighted average number of £0.50 ordinary shares:
For basic earnings per share (shares)		27,302,174		26,558,883		27,168,170	26,535,824
Dilutive effect of potential common stock (shares)		587,735		1,025,632		0	860,733
For diluted earnings per share (shares)		27,889,909		27,584,515		27,168,170	27,396,557
Earnings per share using weighted average number of ordinary shares outstanding:
Basic earnings / (loss) per ordinary share (usd per share) | $ / shares		$ 0.13		$ 0.43		$ (0.01)	$ 0.80
Diluted earnings / (loss) per ordinary share (usd per share) | $ / shares	[1]	$ 0.13		$ 0.41		$ (0.01)	$ 0.78
Class of Stock [Line Items]
Shares not included in the computation of diluted EPS (in shares)						662,832
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 for 2019 year-to-date has not been diluted, since the incremental shares included in the weighted-average number of shares outstanding would have been anti-dilutive.

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