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Segment reporting - Summarized Consolidated Statement of Cash Flows By Operating Segment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of operating segments [line items]      
Net cash from (used in) operating activities $ 837,380 $ 255,553 $ (25,305)
Net cash from (used in) investing activities 869,680 (158,845) (353,246)
Net cash from (used in) financing activities (1,460,887) (62,895) 373,893
Capital expenditure (338,662) (540,240) (413,319)
Right-of-use assets 32,936 21,493 29,001
Operating segments | Tankers      
Disclosure of operating segments [line items]      
Net cash from (used in) operating activities 807,865 230,207 (32,132)
Net cash from (used in) investing activities 869,680 (132,942) (351,767)
Net cash from (used in) financing activities (1,431,449) (65,916) (378,528)
Capital expenditure (338,662) (395,802) (413,319)
Right-of-use assets 32,936 21,493  
Operating segments | FSO      
Disclosure of operating segments [line items]      
Net cash from (used in) operating activities 29,507 33,474 35,532
Net cash from (used in) investing activities 0 (134,402) 0
Net cash from (used in) financing activities (29,438) 101,582 (35,259)
Capital expenditure 0 (144,438) 0
Right-of-use assets 0 0  
Equity-accounted investees      
Disclosure of operating segments [line items]      
Net cash from (used in) operating activities (8) 8,128 28,705
Net cash from (used in) investing activities 0 (108,499) 1,479
Net cash from (used in) financing activities 0 98,561 (787,680)
Capital expenditure 0 0 $ 0
Right-of-use assets $ 0 $ 0