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Financial instruments - Derivative Financial Instruments (Hedges) Measured at Fair Value (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 18, 2023
Dec. 31, 2024
Dec. 31, 2023
Financial instruments [Line Items]      
Hedging assets   $ 21,263 $ 25,039
Hedging liabilities   29,174 53,657
Effect on profit or loss for the period derivative instruments   27,149 (7,666)
Hedging reserve in equity before tax   (20,439) (1,275)
Series Q bonds      
Financial instruments [Line Items]      
Effect on profit or loss for the period derivative instruments $ 16,440    
Proceeds received related to hedging items $ 17,320    
Debt | Cross currency swap contracts      
Financial instruments [Line Items]      
Hedging assets   18,335 23,031
Hedging liabilities   28,756 38,810
Effect on profit or loss for the period derivative instruments   10,018 (13,067)
Hedging reserve in equity before tax   (20,439) (2,712)
Debt | Cross currency swap contracts | Short term      
Financial instruments [Line Items]      
Hedging assets   15,405 7,038
Hedging liabilities   7,316 30,442
Effect on profit or loss for the period derivative instruments   0 0
Hedging reserve in equity before tax   0 0
Debt | Cross currency swap contracts | Long term      
Financial instruments [Line Items]      
Hedging assets   2,930 15,993
Hedging liabilities   21,440 8,368
Effect on profit or loss for the period derivative instruments   0 0
Hedging reserve in equity before tax   0 0
Investment      
Financial instruments [Line Items]      
Hedging assets   18,335 24,520
Hedging liabilities   28,756 38,862
Effect on profit or loss for the period derivative instruments   10,018 (13,067)
Hedging reserve in equity before tax   (20,439) (1,275)
Investment | Forward contract      
Financial instruments [Line Items]      
Hedging assets   0 1,489
Hedging liabilities   0 52
Effect on profit or loss for the period derivative instruments   0 0
Hedging reserve in equity before tax   0 1,437
Investment | Forward contract | Short term      
Financial instruments [Line Items]      
Hedging assets   0 1,489
Hedging liabilities   0 0
Effect on profit or loss for the period derivative instruments   0
Hedging reserve in equity before tax   0
Investment | Forward contract | Long term      
Financial instruments [Line Items]      
Hedging assets   0 0
Hedging liabilities   0 52
Effect on profit or loss for the period derivative instruments   0 0
Hedging reserve in equity before tax   0 1,437
Investment | Option contract      
Financial instruments [Line Items]      
Hedging assets   2,928 519
Hedging liabilities   418 14,795
Effect on profit or loss for the period derivative instruments   17,131 5,401
Hedging reserve in equity before tax   0 0
Investment | Option contract | Short term      
Financial instruments [Line Items]      
Hedging assets   2,928 519
Hedging liabilities   418 14,795
Effect on profit or loss for the period derivative instruments   0 0
Hedging reserve in equity before tax   $ 0 $ 0