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Financial risk management (Details Textual)	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Financial risk management [Line Items]
Closing foreign exchange rate | Pure	748.74	694.77
Percentage of Financial Liabilities Maturing in Next 12 Months	4.00%
Undrawn borrowing facilities	$ 477,000,000
Finance income (cost)	$ 0.06
CHILE
Financial risk management [Line Items]
Average foreign exchange rate	7,300
Derivatives [member]
Financial risk management [Line Items]
Financial assets, at fair value	$ 18,900,000	$ 3,900,000
Adjustments for unrealised foreign exchange losses (gains)	$ 424,000,000

X

- Definition

Adjustments for unrealised foreign exchange losses (gains) to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Profit (loss)]

+ References

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- Definition

The average exchange rate used by the entity. Exchange rate is the ratio of exchange for two currencies.

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- Definition

The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery.

+ References

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- Definition

The amount of income or cost associated with interest and other financing activities of the entity.

+ References

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The fair value of financial assets. [Refer: At fair value [member]; Financial assets]

+ References

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The amount of undrawn borrowing facilities that may be available for future operating activities and to settle capital commitments. [Refer: Capital commitments]

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The percentage of financial liabilities that are maturing in next 12 months.

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