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Income taxes - Analysis of taxation charge for the year (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current income taxes:      
Total current tax charge $ 5,200,000 $ 3,700,000 $ 6,200,000
Origination and reversal of temporary differences (5,300,000) 2,100,000 2,700,000
Adjustments in respect of previous years 500,000 200,000 600,000
Total deferred income taxes (credit) / charge (4,800,000) 2,300,000 3,300,000
Tax on profit on operations 400,000 6,000,000 9,500,000
Tax expense from discontinued operations   0 0
Expense of restructuring activities 12,100,000 400,000 21,800,000
Gas Cylinders      
Current income taxes:      
Expense of restructuring activities 6,600,000    
U.K.      
Current income taxes:      
Corporate tax 0 0 300,000
Adjustments in respect of previous years (300,000) 200,000 (400,000)
Total current tax charge (300,000) 200,000 (100,000)
Non-U.K.      
Current income taxes:      
Corporate tax 6,300,000 3,500,000 7,200,000
Adjustments in respect of previous years $ (800,000) $ 0 $ (900,000)