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Financial risk management - Interest rate risk (Details) - Interest rate risk - Fixed interest rate - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of financial instruments by type of interest rate [line items]    
Long-term debt $ 2,414,935 $ 2,141,801
Reasonably possible change in risk variable, percent 1.00%  
Reasonably possible change in risk variable, impact on debt $ 119,600 100,500
Unsecured notes    
Disclosure of financial instruments by type of interest rate [line items]    
Long-term debt 2,273,881 1,985,660
Other limited recourse debt facilities    
Disclosure of financial instruments by type of interest rate [line items]    
Long-term debt $ 141,054 $ 156,141