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Critical accounting estimates and judgments - Narrative (Details) $ in Thousands | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) cash_generating_unit | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) cash_generating_unit
--- | --- | --- | --- | ---
Disclosure of information for cash-generating units [line items] |  |  |  |
Number of cash-generating units | cash_generating_unit |  | 40 |  | 37
Total assets allocated to CGUs tested | $ | $ 2,521,307 |  | $ 2,277,372 |
Argentina |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Number of cash-generating units | cash_generating_unit |  | 12 |  | 11
Argentina | Cash-generating units |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Total assets allocated to CGUs tested | $ | 176,000 | $ 176,438 |  | $ 191,868
Brazil |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Number of cash-generating units | cash_generating_unit |  | 2 |  | 2
Brazil | Cash-generating units |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Total assets allocated to CGUs tested | $ | $ 652,000 | $ 619,945 |  | $ 624,891

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