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Financial instruments - Unsecured Obligations, 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 | 3,502,235 | 2,948,462
Carrying amount | 3,502,235 | 2,948,462
Bond issuance costs | (52,776) | (38,977)
Total | 3,449,459 | 2,909,485
Unsecured obligations | Over 1 year to 2 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 250,000
Carrying amount | 0 | 250,000
Unsecured obligations | Over 2 years to 3 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Unsecured obligations | Over 3 years to 4 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Unsecured obligations | Over 4 years to 5 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Unsecured obligations | Over 5 years |  |
Financial instruments [Line Items] |  |
Notional amount | 3,502,235 | 2,698,462
Carrying amount | $ 3,502,235 | $ 2,698,462
Single Series Bond, ThUS$250,000 |  |
Financial instruments [Line Items] |  |
Effective rate | 0.39% | 0.80%
Nominal rate | 4.38% | 4.38%
Notional amount | $ 254,648 | $ 4,648
Bond issuance costs | $ (36) | $ (433)
Single Series Bond, ThUS$250,000 | Unsecured obligations |  |
Financial instruments [Line Items] |  |
Effective rate | 4.14% | 4.24%
Nominal rate | 4.25% | 4.38%
Notional amount | $ 450,000 | $ 250,000
Carrying amount | 450,000 | 250,000
Bond issuance costs | (2,313) | (36)
Total | 447,687 | 249,964
Single Series Bond, ThUS$250,000 | Unsecured obligations | Over 1 year to 2 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 250,000
Carrying amount | 0 | 250,000
Single Series Bond, ThUS$250,000 | Unsecured obligations | Over 2 years to 3 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Single Series Bond, ThUS$250,000 | Unsecured obligations | Over 3 years to 4 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Single Series Bond, ThUS$250,000 | Unsecured obligations | Over 4 years to 5 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Single Series Bond, ThUS$250,000 | Unsecured obligations | Over 5 years |  |
Financial instruments [Line Items] |  |
Notional amount | 450,000 | 0
Carrying amount | $ 450,000 | $ 0
Single Series Bond, ThUS$450,000 |  |
Financial instruments [Line Items] |  |
Effective rate | 1.98% | 2.39%
Nominal rate | 4.25% | 4.25%
Notional amount | $ 2,869 | $ 2,869
Bond issuance costs | $ (677) | $ (677)
Single Series Bond, ThUS$450,000 | Unsecured obligations |  |
Financial instruments [Line Items] |  |
Effective rate | 4.23% | 4.14%
Nominal rate | 4.25% | 4.25%
Notional amount | $ 400,000 | $ 450,000
Carrying amount | 400,000 | 450,000
Bond issuance costs | (5,644) | (2,991)
Total | 394,356 | 447,009
Single Series Bond, ThUS$450,000 | Unsecured obligations | Over 1 year to 2 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Single Series Bond, ThUS$450,000 | Unsecured obligations | Over 2 years to 3 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Single Series Bond, ThUS$450,000 | Unsecured obligations | Over 3 years to 4 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Single Series Bond, ThUS$450,000 | Unsecured obligations | Over 4 years to 5 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Single Series Bond, ThUS$450,000 | Unsecured obligations | Over 5 years |  |
Financial instruments [Line Items] |  |
Notional amount | 400,000 | 450,000
Carrying amount | $ 400,000 | $ 450,000
Single Series Bond, ThUS$400,000 |  |
Financial instruments [Line Items] |  |
Effective rate | 3.43% | 3.62%
Nominal rate | 4.25% | 4.25%
Notional amount | $ 7,508 | $ 7,508
Bond issuance costs | $ (235) | $ (235)
Single Series Bond, ThUS$400,000 | Unsecured obligations |  |
Financial instruments [Line Items] |  |
Effective rate | 3.45% | 4.23%
Nominal rate | 3.50% | 4.25%
Notional amount | $ 700,000 | $ 400,000
Carrying amount | 700,000 | 400,000
Bond issuance costs | (14,232) | (5,879)
Total | 685,768 | 394,121
Single Series Bond, ThUS$400,000 | Unsecured obligations | Over 1 year to 2 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Single Series Bond, ThUS$400,000 | Unsecured obligations | Over 2 years to 3 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Single Series Bond, ThUS$400,000 | Unsecured obligations | Over 3 years to 4 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Single Series Bond, ThUS$400,000 | Unsecured obligations | Over 4 years to 5 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Single Series Bond, ThUS$400,000 | Unsecured obligations | Over 5 years |  |
Financial instruments [Line Items] |  |
Notional amount | 700,000 | 400,000
Carrying amount | $ 700,000 | $ 400,000
Single Series Bond, ThUS$700,000 |  |
Financial instruments [Line Items] |  |
Effective rate | 3.14% | 3.30%
Nominal rate | 3.50% | 3.50%
Notional amount | $ 7,554 | $ 7,554
Bond issuance costs | $ (555) | $ (555)
Single Series Bond, ThUS$700,000 | Unsecured obligations |  |
Financial instruments [Line Items] |  |
Effective rate | 6.89% | 3.45%
Nominal rate | 6.50% | 3.50%
Notional amount | $ 750,000 | $ 700,000
Carrying amount | 750,000 | 700,000
Bond issuance costs | (12,590) | (14,787)
Total | 737,410 | 685,213
Single Series Bond, ThUS$700,000 | Unsecured obligations | Over 1 year to 2 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Single Series Bond, ThUS$700,000 | Unsecured obligations | Over 2 years to 3 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Single Series Bond, ThUS$700,000 | Unsecured obligations | Over 3 years to 4 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Single Series Bond, ThUS$700,000 | Unsecured obligations | Over 4 years to 5 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Single Series Bond, ThUS$700,000 | Unsecured obligations | Over 5 years |  |
Financial instruments [Line Items] |  |
Notional amount | 750,000 | 700,000
Carrying amount | $ 750,000 | $ 700,000
Single Series Bond, ThUS$750,000 |  |
Financial instruments [Line Items] |  |
Effective rate | 6.02% | 6.89%
Nominal rate | 6.50% | 6.50%
Notional amount | $ 7,313 | $ 7,312
Bond issuance costs | $ (1,611) | $ (1,521)
Single Series Bond, ThUS$750,000 | Unsecured obligations |  |
Financial instruments [Line Items] |  |
Effective rate | 5.86% | 6.89%
Nominal rate | 5.50% | 6.50%
Notional amount | $ 850,000 | $ 750,000
Carrying amount | 850,000 | 750,000
Bond issuance costs | (16,433) | (13,437)
Total | 833,567 | 736,563
Single Series Bond, ThUS$750,000 | Unsecured obligations | Over 1 year to 2 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Single Series Bond, ThUS$750,000 | Unsecured obligations | Over 2 years to 3 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Single Series Bond, ThUS$750,000 | Unsecured obligations | Over 3 years to 4 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Single Series Bond, ThUS$750,000 | Unsecured obligations | Over 4 years to 5 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Single Series Bond, ThUS$750,000 | Unsecured obligations | Over 5 years |  |
Financial instruments [Line Items] |  |
Notional amount | 850,000 | 750,000
Carrying amount | $ 850,000 | $ 750,000
Series H bonds |  |
Financial instruments [Line Items] |  |
Effective rate | 1.55% | 1.58%
Nominal rate | 4.90% | 4.90%
Notional amount | $ 15,844 | $ 17,599
Bond issuance costs | $ (172) | $ (172)
Series H bonds | Unsecured obligations |  |
Financial instruments [Line Items] |  |
Effective rate | 4.76% | 4.76%
Nominal rate | 4.90% | 4.90%
Notional amount | $ 63,087 | $ 83,887
Carrying amount | 63,087 | 83,887
Bond issuance costs | (689) | (861)
Total | 62,398 | 83,026
Series H bonds | Unsecured obligations | Over 1 year to 2 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Series H bonds | Unsecured obligations | Over 2 years to 3 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Series H bonds | Unsecured obligations | Over 3 years to 4 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Series H bonds | Unsecured obligations | Over 4 years to 5 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Series H bonds | Unsecured obligations | Over 5 years |  |
Financial instruments [Line Items] |  |
Notional amount | 63,087 | 83,887
Carrying amount | $ 63,087 | $ 83,887
Series O bonds |  |
Financial instruments [Line Items] |  |
Effective rate | 1.51% | 1.68%
Nominal rate | 3.80% | 3.80%
Notional amount | $ 907 | $ 987
Bond issuance costs | $ (81) | $ (82)
Series O bonds | Unsecured obligations |  |
Financial instruments [Line Items] |  |
Effective rate | 3.69% | 3.69%
Nominal rate | 3.80% | 3.80%
Notional amount | $ 57,830 | $ 62,915
Carrying amount | 57,830 | 62,915
Bond issuance costs | (578) | (659)
Total | 57,252 | 62,256
Series O bonds | Unsecured obligations | Over 1 year to 2 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Series O bonds | Unsecured obligations | Over 2 years to 3 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Series O bonds | Unsecured obligations | Over 3 years to 4 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Series O bonds | Unsecured obligations | Over 4 years to 5 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Series O bonds | Unsecured obligations | Over 5 years |  |
Financial instruments [Line Items] |  |
Notional amount | 57,830 | 62,915
Carrying amount | $ 57,830 | $ 62,915
Series P bonds |  |
Financial instruments [Line Items] |  |
Effective rate | 1.10% | 1.41%
Nominal rate | 3.25% | 3.25%
Notional amount | $ 1,719 | $ 1,871
Bond issuance costs | $ (12) | $ (12)
Series P bonds | Unsecured obligations |  |
Financial instruments [Line Items] |  |
Effective rate | 3.24% | 3.24%
Nominal rate | 3.25% | 3.25%
Notional amount | $ 115,659 | $ 125,830
Carrying amount | 115,659 | 125,830
Bond issuance costs | (27) | (40)
Total | 115,632 | 125,790
Series P bonds | Unsecured obligations | Over 1 year to 2 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Series P bonds | Unsecured obligations | Over 2 years to 3 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Series P bonds | Unsecured obligations | Over 3 years to 4 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Series P bonds | Unsecured obligations | Over 4 years to 5 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Series P bonds | Unsecured obligations | Over 5 years |  |
Financial instruments [Line Items] |  |
Notional amount | 115,659 | 125,830
Carrying amount | $ 115,659 | $ 125,830
Series Q bonds |  |
Financial instruments [Line Items] |  |
Effective rate | 2.23% | 2.41%
Nominal rate | 3.45% | 3.45%
Notional amount | $ 330 | $ 359
Bond issuance costs | $ (22) | $ (21)
Series Q bonds | Unsecured obligations |  |
Financial instruments [Line Items] |  |
Effective rate | 3.54% | 3.54%
Nominal rate | 3.45% | 3.45%
Notional amount | $ 115,659 | $ 125,830
Carrying amount | 115,659 | 125,830
Bond issuance costs | (270) | (287)
Total | 115,389 | 125,543
Series Q bonds | Unsecured obligations | Over 1 year to 2 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Series Q bonds | Unsecured obligations | Over 2 years to 3 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Series Q bonds | Unsecured obligations | Over 3 years to 4 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Series Q bonds | Unsecured obligations | Over 4 years to 5 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Series Q bonds | Unsecured obligations | Over 5 years |  |
Financial instruments [Line Items] |  |
Notional amount | 115,659 | 125,830
Carrying amount | $ 115,659 | $ 125,830

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