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Income taxes - Analysis of taxation charge for the year (Details) - USD ($) | 12 Months Ended
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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)

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- Definition Adjustments of tax expense (income) recognised in the period for the deferred tax of prior periods. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 80 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_80&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of income taxes payable (recoverable) in respect of the taxable profit (tax loss) for a period. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 80 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_80_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of tax expense (income) relating to changes in deferred tax liabilities and deferred tax assets. [Refer: Deferred tax assets; Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_g_ii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of expense relating to restructuring. Restructuring is a programme that is planned and controlled by management and materially changes either the scope of a business undertaken by an entity or the manner in which that business is conducted. Such programmes include: (a) the sale or termination of a line of business; (b) closure of business locations in a country or region or the relocation of activities from one country or region to another; (c) changes in management structure; and (d) fundamental reorganisations that have a material effect on the nature and focus of the entity's operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 98 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_98_b&doctype=Standard -URIDate 2017-03-09 + Details
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