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Financial instruments - Bank Borrowings, Non-Current (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Financial instruments [Line Items] |  |
Notional amount | $ 313,107 | $ 50,707
Bond issuance costs | (5,336) | (3,708)
Unsecured obligations |  |
Financial instruments [Line Items] |  |
Notional amount | 136,000 | 300,000
Carrying amount | 136,000 | 300,000
Bond issuance costs | (6,317) | (4,482)
Total | 129,683 | 295,518
Unsecured obligations | Over 1 year to 2 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Unsecured obligations | Over 2 years to 3 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 200,000
Carrying amount | 0 | 200,000
Unsecured obligations | Over 3 years to 4 years |  |
Financial instruments [Line Items] |  |
Notional amount | 136,000 | 100,000
Carrying amount | $ 136,000 | $ 100,000
Banco Santander/Kexim |  |
Financial instruments [Line Items] |  |
Effective rate | 4.73% | 5.49%
Nominal rate | 4.28% | 6.36%
Banco Santander/Kexim | Unsecured obligations |  |
Financial instruments [Line Items] |  |
Notional amount | $ 100,000 | $ 100,000
Carrying amount | 100,000 | 100,000
Bond issuance costs | (2,997) | (2,834)
Total | 97,003 | 97,166
Banco Santander/Kexim | Unsecured obligations | Over 1 year to 2 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Banco Santander/Kexim | Unsecured obligations | Over 2 years to 3 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Banco Santander/Kexim | Unsecured obligations | Over 3 years to 4 years |  |
Financial instruments [Line Items] |  |
Notional amount | 100,000 | 100,000
Carrying amount | $ 100,000 | $ 100,000
Banco Santander Kexim 2 |  |
Financial instruments [Line Items] |  |
Effective rate | 4.27% |
Nominal rate | 4.29% |
Banco Santander Kexim 2 | Unsecured obligations |  |
Financial instruments [Line Items] |  |
Notional amount | $ 36,000 |
Carrying amount | 36,000 |
Bond issuance costs | (3,320) |
Total | 32,680 |
Banco Santander Kexim 2 | Unsecured obligations | Over 1 year to 2 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 |
Carrying amount | 0 |
Banco Santander Kexim 2 | Unsecured obligations | Over 2 years to 3 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 |
Carrying amount | 0 |
Banco Santander Kexim 2 | Unsecured obligations | Over 3 years to 4 years |  |
Financial instruments [Line Items] |  |
Notional amount | 36,000 |
Carrying amount | $ 36,000 |
Bank of Nova Scotia |  |
Financial instruments [Line Items] |  |
Effective rate |  | 5.88%
Nominal rate |  | 6.64%
Bank of Nova Scotia | Unsecured obligations |  |
Financial instruments [Line Items] |  |
Notional amount |  | $ 200,000
Carrying amount |  | 200,000
Bond issuance costs |  | (1,648)
Total |  | 198,352
Bank of Nova Scotia | Unsecured obligations | Over 1 year to 2 years |  |
Financial instruments [Line Items] |  |
Notional amount |  | 0
Carrying amount |  | 0
Bank of Nova Scotia | Unsecured obligations | Over 2 years to 3 years |  |
Financial instruments [Line Items] |  |
Notional amount |  | 200,000
Carrying amount |  | 200,000
Bank of Nova Scotia | Unsecured obligations | Over 3 years to 4 years |  |
Financial instruments [Line Items] |  |
Notional amount |  | 0
Carrying amount |  | $ 0

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- Definition The amount of interest and other costs that an entity incurs in connection with the borrowing of funds. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 7 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_7&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The non-current portion of non-current bonds issued. [Refer: Bonds issued] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The nominal or face amount of a financial instrument, used to calculate payments made on that instrument. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
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