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Earnings per share Earnings per share (Details) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares	Sep. 29, 2019 USD ($) $ / shares	Jun. 30, 2019 USD ($) $ / shares	Mar. 31, 2019 USD ($) $ / shares	Dec. 31, 2018 USD ($) $ / shares	Sep. 30, 2018 USD ($) $ / shares	Jul. 01, 2018 USD ($) $ / shares	Apr. 01, 2018 USD ($) $ / shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2019 £ / shares	Dec. 31, 2018 £ / shares
Basic earnings:
Net income | $	$ (2.4)	$ 5.8	$ 3.5	$ (3.8)	$ (8.5)	$ 12.2	$ 11.4	$ 9.9	$ 3.1	$ 25.0	$ 16.6
Weighted average number of £0.50 ordinary shares:
For basic earnings per share (shares)									27,289,042	26,708,469	26,460,947
Dilutive effect of potential common stock (shares)									593,822	983,793	263,034
For diluted earnings per share (shares)									27,882,864	27,692,262	26,723,981
Earnings per share using weighted average number of ordinary shares outstanding:
Basic earnings per ordinary share (usd per share) | $ / shares	$ (0.09)	$ 0.21	$ 0.13	$ (0.14)	$ (0.31)	$ 0.46	$ 0.43	$ 0.37	$ 0.11	$ 0.94	$ 0.63
Diluted earnings per ordinary share (usd per share) | $ / shares	$ (0.09)	$ 0.21	$ 0.13	$ (0.14)	$ (0.31)	$ 0.44	$ 0.42	$ 0.36	$ 0.11	$ 0.90	$ 0.62
Ordinary shares
Class of Stock [Line Items]
Common stock, par value (in GBP per share) | £ / shares												£ 0.50	£ 0.50

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