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Summary of significant accounting policies (Details 2) - Argentina Consumer Price [Member]	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Level of price index	183.13	124.80	100.00
Price index movements	47.5	24.8	0

X

- Definition

The value of the level of the general price index used to restate financial statement information of an entity whose functional currency is the currency of a hyperinflationary economy.

+ References

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X

- Definition

The movements in the general price index used to restate financial statement information of an entity whose functional currency is the currency of a hyperinflationary economy.

+ References

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