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Financial instruments - Fair values and risk management - Tanker market risk scenario (Details) - Market risk - USD ($)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items]      
Sensitivity analysis, reasonably possible change in risk variable, amount $ 1,000 $ 1,000 $ 1,000
Increase in risk variable, impact on profit (loss) 20,252,000 21,348,000 21,270,000
Decrease in risk variable, impact on profit (loss) $ (20,252,000) $ (21,348,000) $ (21,270,000)