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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