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Financial instruments - Hedge accounting (Details) - Currency risk $ in Millions, $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2017 ARS ($) tranche	Dec. 31, 2017 USD ($) $ / item	Dec. 31, 2017 ARS ($)	Dec. 31, 2017 ARS ($) $ / item	Sep. 15, 2017 USD ($)	Jun. 30, 2017 ARS ($) $ / item	Mar. 31, 2017 USD ($)	Mar. 15, 2017 USD ($)
Fair value hedges | Other comprehensive results
Hedge accounting
Receivables recognized				$ 4.0
Receivables recognized, Current				2.0
Receivables recognized, Non-current				2.0
Fair value hedges | Foreign currency exchange rate gains
Hedge accounting
Receivables recognized				6.0
Gains recognized from receivables			$ 6.0
NDF | Fair value hedges
Hedge accounting
Notional amount	$ 40.0				$ 100.0		$ 400.0	$ 300.0
Number of Tranches | tranche	2
Liability of hedging instruments				17.0
Current liability of hedging instrument				8.0
Non-current liability of hedging instrument				$ 9.0
Net gain/loss			$ (36.0)
NDF | Fair value hedges | Minimum
Hedge accounting
Interest rate (as a percent)		208.70%	208.70%
NDF | Fair value hedges | Maximum
Hedge accounting
Interest rate (as a percent)		245.25%	245.25%
NDF | Fair value hedges | Weighted average
Hedge accounting
Interest rate (as a percent)		222.58%	222.58%
NDF | Maturing between February and April 2018 | Fair value hedges
Hedge accounting
Notional amount						$ 53.5
Average exchange rate | $ / item						18.30
NDF | Maturing February 2017 | Fair value hedges
Hedge accounting
Notional amount, duration		$ 7.0
Net gain/loss			$ 2.0
NDF | Maturing between March and August 2018 | Fair value hedges
Hedge accounting
Notional amount		$ 6.3
Average exchange rate | $ / item		18.94		18.94
NDF | Personal | Commercial commitments
Hedge accounting
Notional amount, duration		$ 159.0
Net gain/loss			2.0
NDF | Personal | Maturing March 2017 | Cash flow hedges
Hedge accounting
Notional amount, duration		$ 9.0
Current liability of hedging instrument				$ 2.0
Net gain/loss			(1.0)
Deferred income/expense before income tax			(1.0)
Other receivables | Fair value hedges
Hedge accounting
Receivables recognized				59.0
Reserve of receivables in other comprehensive income				$ 6.0
Gains recognized from receivables			$ 53.0
2.1325% NDF | Fair value hedges
Hedge accounting
Notional amount	$ 20.0
Interest rate (as a percent)	213.25%
2.085% NDF | Fair value hedges
Hedge accounting
Notional amount	$ 20.0
Interest rate (as a percent)	208.50%

X

- Definition

The average price of a hedging instrument. [Refer: Hedging instruments [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2018-01-01
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- Definition

The amount of current loans and receivables. [Refer: Loans and receivables]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2018-01-01
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The gains (losses) on loans and receivables. [Refer: Loans and receivables]

+ References

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The amount of non-derivative financial assets with fixed or determinable payments that are not quoted in an active market, other than: (a) those that the entity intends to sell immediately or in the near term, which shall be classified as held for trading, and those that the entity, upon initial recognition, designates as at fair value through profit or loss; (b) those that the entity, upon initial recognition, designates as available for sale; or (c) those for which the holder may not recover substantially all of its initial investment, other than because of credit deterioration, which shall be classified as available for sale. An interest acquired in a pool of assets that are not loans or receivables (for example, an interest in a mutual fund or a similar fund) is not a loan or receivable. [Refer: Derivative financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ References

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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