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Significant accounting policies - Other (Details) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Jan. 02, 2018 USD ($) | Jan. 01, 2018 USD ($) item
Significant accounting policies |  |  |  |
Ifrs Cumulative Effect Of New Accounting Principle In Period Of Adoption |  |  | $ 27,100,000 |
Number of equity investments accounted for at cost | item |  |  |  | 1
Carrying value |  |  |  | $ 4,000,000
Number of loan receivable carried at amortized cost | item |  |  |  | 1
Loan receivable at amortized cost |  |  |  | $ 30,100,000
Impairment loss recognized | $ 0 | $ 0 |  |

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- References No definition available. + Details
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- Definition Amount after tax of changes in equity or changes in net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption. + References No definition available. + Details
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- Definition Carrying value of investments designated as held at cost. + References No definition available. + Details
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- Definition Value of loan receivable at amortized cost. + References No definition available. + Details
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- Definition The number of equity investments accounted for at cost. + References No definition available. + Details
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- Definition The number of loan receivable accounted for at amortized cost. + References No definition available. + Details
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- Definition The amount of impairment loss recognised in profit or loss. [Refer: Impairment loss; Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 126 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_126_a&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 129 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_129_a&doctype=Standard -URIDate 2017-03-09 + Details
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