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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, 2023
Dec. 31, 2022
Financial instruments [Line Items]      
Hedging assets   $ 25,039 $ 33,794
Hedging liabilities   53,657 68,342
Effect on profit or loss for the period derivative instruments   (7,666) 25,714
Hedging reserve in equity before tax   (1,275) (19,967)
Series Q bonds      
Financial instruments [Line Items]      
Effect on profit or loss for the period derivative instruments $ 16,440    
Debt | Cross currency swap contracts      
Financial instruments [Line Items]      
Hedging assets   23,031 22,481
Hedging liabilities   38,810 62,526
Effect on profit or loss for the period derivative instruments   (13,067) (12,939)
Hedging reserve in equity before tax   (2,712) (27,106)
Debt | Cross currency swap contracts | Short term      
Financial instruments [Line Items]      
Hedging assets   7,038 7,014
Hedging liabilities   30,442 42,754
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   15,993 15,467
Hedging liabilities   8,368 19,772
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   24,520 29,620
Hedging liabilities   38,862 62,526
Effect on profit or loss for the period derivative instruments   (13,067) (12,939)
Hedging reserve in equity before tax   (1,275) (19,967)
Investment | Forward contract      
Financial instruments [Line Items]      
Hedging assets   1,489 7,139
Hedging liabilities   52 0
Effect on profit or loss for the period derivative instruments   0 0
Hedging reserve in equity before tax   1,437 7,139
Investment | Forward contract | Short term      
Financial instruments [Line Items]      
Hedging assets   1,489  
Hedging liabilities   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 7,139
Hedging liabilities   52 0
Effect on profit or loss for the period derivative instruments   0 0
Hedging reserve in equity before tax   1,437 7,139
Investment | Option contract      
Financial instruments [Line Items]      
Hedging assets   519 4,174
Hedging liabilities   14,795 5,816
Effect on profit or loss for the period derivative instruments   5,401 38,653
Hedging reserve in equity before tax   0 0
Investment | Option contract | Short term      
Financial instruments [Line Items]      
Hedging assets   519 4,174
Hedging liabilities   14,795 5,816
Effect on profit or loss for the period derivative instruments   0 0
Hedging reserve in equity before tax   $ 0 $ 0