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Income and other taxes - Narrative (Details) - USD ($) | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | $ 46,353,000 | $ 98,169,000 | $ 137,524,000
United States |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deductible temporary differences for which no deferred tax asset is recognised | 231,000,000 | 262,000,000 |
Trinidad |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Operating loss carryforwards | 69,800,000 | 59,800,000 |
Deferred tax assets | 24,400,000 | 20,900,000 |
New Zealand |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Operating loss carryforwards | 6,500,000 | 0 |
Deferred tax assets | 1,800,000 | 0 |
Canada |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Operating loss carryforwards | 120,800,000 | 167,800,000 |
Deferred tax assets | $ 29,600,000 | $ 41,000,000 |

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- Definition The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2022-03-24 -Paragraph 81 -Subparagraph g -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2022-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 54 -Subparagraph o -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_54_o&doctype=Standard -URIDate 2022-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 56 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_56&doctype=Standard -URIDate 2022-03-24 + Details
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