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Provisions and other long-term liabilities (Details) |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 26, 2021 item | Dec. 31, 2022 USD ($) | Dec. 31, 2022 GBP (£) | Dec. 31, 2021 USD ($) | Feb. 06, 2023 USD ($) | Feb. 06, 2023 GBP (£) | Jan. 26, 2023 item | Jul. 31, 2022 item | Jul. 15, 2021 item | Feb. 29, 2020 GBP (£)
Disclosure of other provisions [line items] |  |  |  |  |  |  |  |  |  |
Other provisions at beginning of period |  | $ 62,848,000 |  | $ 82,370,000 |  |  |  |  |  |
Addition to provision / changes in estimates |  | (7,612,000) |  | (638,000) |  |  |  |  |  |
Exchange difference |  | (1,983,000) |  | (1,975,000) |  |  |  |  |  |
Foreign currency translation |  | (563,000) |  | (653,000) |  |  |  |  |  |
Amortization |  | (2,407,000) |  | (223,000) |  |  |  |  |  |
Unwinding of discount |  | 3,188,000 |  | 3,626,000 |  |  |  |  |  |
Amounts used during the year |  | (1,524,000) |  | (461,000) |  |  |  |  |  |
Liabilities associated with assets held for sale |  |  |  | (19,198,000) |  |  |  |  |  |
Other provisions at end of period |  | 51,947,000 |  | 62,848,000 |  |  |  |  |  |
Amount of Assets Under Freeze | £ |  |  |  |  |  |  |  |  |  | £ 4,465,600
Number of law issues | item |  |  |  |  |  |  | 2 | 2 | 2 |
Number Of Claimants | item | 102 |  |  |  |  |  |  |  |  |
Estimated litigation liability |  |  |  |  | $ 397,089 | £ 330,022 |  |  |  |
Recognized provision related to contingent liability |  | 5,384,000 | £ 4,465,600 |  |  |  |  |  |  |
Provision for decommissioning, restoration and rehabilitation costs [member] |  |  |  |  |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |  |  |  |  |
Other provisions at beginning of period |  | 45,842,000 |  | 64,040,000 |  |  |  |  |  |
Addition to provision / changes in estimates |  | (4,942,000) |  | (651,000) |  |  |  |  |  |
Exchange difference |  | (669,000) |  | (668,000) |  |  |  |  |  |
Foreign currency translation |  | (577,000) |  | (651,000) |  |  |  |  |  |
Amortization |  |  |  | 0 |  |  |  |  |  |
Unwinding of discount |  | 2,641,000 |  | 3,140,000 |  |  |  |  |  |
Amounts used during the year |  | (1,392,000) |  | (170,000) |  |  |  |  |  |
Liabilities associated with assets held for sale |  |  |  | (19,198,000) |  |  |  |  |  |
Other provisions at end of period |  | 40,903,000 |  | 45,842,000 |  |  |  |  |  |
Provision For Deferred Income [member] |  |  |  |  |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |  |  |  |  |
Other provisions at beginning of period |  | 3,331,000 |  | 3,828,000 |  |  |  |  |  |
Addition to provision / changes in estimates |  | 0 |  | (46,000) |  |  |  |  |  |
Exchange difference |  | (167,000) |  | (228,000) |  |  |  |  |  |
Amortization |  | (2,407,000) |  | (223,000) |  |  |  |  |  |
Unwinding of discount |  | 0 |  |  |  |  |  |  |  |
Other provisions at end of period |  | 757,000 |  | 3,331,000 |  |  |  |  |  |
Miscellaneous other provisions [member] |  |  |  |  |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |  |  |  |  |
Other provisions at beginning of period |  | 13,675,000 |  | 14,502,000 |  |  |  |  |  |
Addition to provision / changes in estimates |  | (2,670,000) |  | 59,000 |  |  |  |  |  |
Exchange difference |  | (1,147,000) |  | (1,079,000) |  |  |  |  |  |
Foreign currency translation |  | 14,000 |  | (2,000) |  |  |  |  |  |
Amortization |  |  |  | 0 |  |  |  |  |  |
Unwinding of discount |  | 547,000 |  | 486,000 |  |  |  |  |  |
Amounts used during the year |  | (132,000) |  | (291,000) |  |  |  |  |  |
Other provisions at end of period |  | $ 10,287,000 |  | $ 13,675,000 |  |  |  |  |  |

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- Definition The decrease in other provisions through adjustments arising from the passage of time. + References No definition available. + Details
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- Definition Aggregate carrying amount of the estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs. + References No definition available. + Details
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- Definition Aggregate carrying amount of the estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs. + References No definition available. + Details
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- Definition The decrease in other provisions resulting from the transfer of those provisions to liabilities included in disposal groups classified as held for sale. [Refer: Other provisions; Disposal groups classified as held for sale [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 37 -IssueDate 2022-03-24 -Paragraph 84 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2022-en-r&anchor=para_84&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The increase (decrease) in other provisions resulting from a change in discount rate. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2022-03-24 -Paragraph 84 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2022-en-r&anchor=para_84_e&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The increase (decrease) in other provisions resulting from foreign currency exchange rate changes on provisions measured in a currency different from the entity's presentation currency. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 37 -IssueDate 2022-03-24 -Paragraph 84 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2022-en-r&anchor=para_84&doctype=Standard -URIDate 2022-03-24 + Details
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