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Earnings per share Earnings per share (Details) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares	Sep. 30, 2018 USD ($) $ / shares	Jun. 30, 2018 USD ($) $ / shares	Mar. 31, 2018 USD ($) $ / shares	Dec. 31, 2017 USD ($) $ / shares	Sep. 30, 2017 USD ($) $ / shares	Jun. 30, 2017 USD ($) $ / shares	Mar. 31, 2017 USD ($) $ / shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2018 £ / shares	Dec. 31, 2017 £ / shares
Basic earnings:
Net income | $	$ (8.5)	$ 12.2	$ 11.4	$ 9.9	$ (1.0)	$ 5.8	$ 3.9	$ 7.9	$ 25.0	$ 16.6	$ 17.8
Weighted average number of £0.50 ordinary shares:
For basic earnings per share (shares)									26,708,469	26,460,947	26,443,662
Dilutive effect of potential common stock (shares)									983,793	263,034	210,976
For diluted earnings per share (shares)									27,692,262	26,723,981	26,654,638
Earnings per share using weighted average number of ordinary shares outstanding:
Basic earnings per ordinary share (usd per share) | $ / shares	$ (0.31)	$ 0.46	$ 0.43	$ 0.37	$ (0.04)	$ 0.22	$ 0.15	$ 0.30	$ 0.94	$ 0.63	$ 0.67
Diluted earnings per ordinary share (usd per share) | $ / shares	$ (0.31)	$ 0.44	$ 0.42	$ 0.36	$ (0.04)	$ 0.22	$ 0.15	$ 0.30	$ 0.90	$ 0.62	$ 0.67
Ordinary shares
Class of Stock [Line Items]
Common stock, par value (in GBP per share) | £ / shares												£ 0.50	£ 0.50

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