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Deferred income taxes - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax credit from US tax reform | $ 6.0 |  |
Unrecognized deferred income tax assets for which no deferred tax asset is recognized | 13.3 | $ 12.3 |
Unused tax losses for which no deferred tax asset recognised | 81.9 | 72.1 | $ 82.9
Temporary differences of unremitted earnings of overseas subsidiaries and joint ventures and associates for which deferred tax liabilities have not been recognised | 42.4 | 54.9 |
Indefinite |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Unused tax losses for which no deferred tax asset recognised | 10.3 | 8.8 |
Between 2028 and 2034 |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Unused tax losses for which no deferred tax asset recognised | $ 3.0 | $ 3.5 |

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- Definition The amount of deductible temporary differences for which no deferred tax asset is recognised in the statement of financial position. [Refer: Temporary differences [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_e&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The aggregate amount of temporary differences associated with investments in subsidiaries, branches and associates and interests in joint arrangements, for which deferred tax liabilities have not been recognised as a result of satisfying both of the following conditions: (a) the parent, investor, joint venturer or joint operator is able to control the timing of the reversal of the temporary difference; and (b) it is probable that the temporary difference will not reverse in the foreseeable future. [Refer: Associates [member]; Subsidiaries [member]; Temporary differences [member]; Investments in subsidiaries] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_f&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of unused tax losses for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_e&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Amount of income tax expense (benefit) from effect of Tax Cuts and Jobs Act of 2017. + References No definition available. + Details
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- Details
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- Details
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