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Property, plant and equipment - Schedule of property, plant and equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of changes in property, plant and equipment [abstract]      
Property, plant and equipment, beginning balance $ 3,308,616 $ 3,179,299 $ 3,127,091
Acquisitions 370,155 628,320 436,680
Disposals and cancellations (817,820) (258,899) (39,522)
Depreciation charges (219,428) (221,576) (344,904)
Transfer to assets held for sale (Note 3) (871,875) (18,459)  
Transfers 0 0 0
Translation differences 15 (69) (46)
Property, plant and equipment, ending balance 1,769,663 3,308,616 3,179,299
Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Property, plant and equipment, beginning balance 5,315,120 5,115,573 4,934,443
Property, plant and equipment, ending balance 3,433,409 5,315,120 5,115,573
Depreciation & impairment losses      
Reconciliation of changes in property, plant and equipment [abstract]      
Property, plant and equipment, beginning balance (2,006,504) (1,936,274) (1,807,352)
Property, plant and equipment, ending balance (1,663,746) (2,006,504) (1,936,274)
Vessels      
Reconciliation of changes in property, plant and equipment [abstract]      
Property, plant and equipment, beginning balance 3,057,932 2,967,787 2,865,308
Acquisitions 295,568 448,850 56,111
Disposals and cancellations (815,733) (258,899) (39,522)
Depreciation charges (200,896) (199,457) (296,837)
Transfer to assets held for sale (Note 3) (870,844) (18,459)  
Transfers 163,543 118,110 382,727
Translation differences 0 0 0
Property, plant and equipment, ending balance 1,629,570 3,057,932 2,967,787
Vessels | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Property, plant and equipment, beginning balance 5,014,747 4,875,810 4,608,326
Property, plant and equipment, ending balance 3,265,939 5,014,747 4,875,810
Vessels | Depreciation & impairment losses      
Reconciliation of changes in property, plant and equipment [abstract]      
Property, plant and equipment, beginning balance (1,956,815) (1,908,023) (1,743,018)
Property, plant and equipment, ending balance (1,636,369) (1,956,815) (1,908,023)
Vessels under construction      
Reconciliation of changes in property, plant and equipment [abstract]      
Property, plant and equipment, beginning balance 228,429 181,293 207,069
Acquisitions 41,627 165,246 356,951
Disposals and cancellations 0 0 0
Depreciation charges 0 0 0
Transfer to assets held for sale (Note 3) 0 0  
Transfers (163,543) (118,110) (382,727)
Translation differences 0 0 0
Property, plant and equipment, ending balance 106,513 228,429 181,293
Vessels under construction | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Property, plant and equipment, beginning balance 228,429 181,293 207,069
Property, plant and equipment, ending balance 106,513 228,429 181,293
Vessels under construction | Depreciation & impairment losses      
Reconciliation of changes in property, plant and equipment [abstract]      
Property, plant and equipment, beginning balance 0 0 0
Property, plant and equipment, ending balance 0 0 0
Right-of-use assets      
Reconciliation of changes in property, plant and equipment [abstract]      
Property, plant and equipment, beginning balance 21,493 29,001 52,955
Acquisitions 31,557 14,060 23,476
Disposals and cancellations (2,087) 0 0
Depreciation charges (18,040) (21,509) (47,387)
Transfer to assets held for sale (Note 3) 0 0  
Transfers 0 0 0
Translation differences 13 (59) (43)
Property, plant and equipment, ending balance 32,936 21,493 29,001
Right-of-use assets | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Property, plant and equipment, beginning balance 66,785 53,226 113,859
Property, plant and equipment, ending balance 56,240 66,785 53,226
Right-of-use assets | Depreciation & impairment losses      
Reconciliation of changes in property, plant and equipment [abstract]      
Property, plant and equipment, beginning balance (45,292) (24,225) (60,904)
Property, plant and equipment, ending balance (23,304) (45,292) (24,225)
Other tangible assets      
Reconciliation of changes in property, plant and equipment [abstract]      
Property, plant and equipment, beginning balance 762 1,218 1,759
Acquisitions 372 164 142
Disposals and cancellations 0 0 0
Depreciation charges (492) (610) (680)
Transfer to assets held for sale (Note 3) 0 0  
Transfers 0 0 0
Translation differences 2 (10) (3)
Property, plant and equipment, ending balance 644 762 1,218
Other tangible assets | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Property, plant and equipment, beginning balance 5,159 5,244 5,189
Property, plant and equipment, ending balance 4,717 5,159 5,244
Other tangible assets | Depreciation & impairment losses      
Reconciliation of changes in property, plant and equipment [abstract]      
Property, plant and equipment, beginning balance (4,397) (4,026) (3,430)
Property, plant and equipment, ending balance (4,073) (4,397) (4,026)
Prepayments      
Reconciliation of changes in property, plant and equipment [abstract]      
Property, plant and equipment, beginning balance 0 0 0
Acquisitions 1,031 0 0
Disposals and cancellations 0 0 0
Depreciation charges 0 0 0
Transfer to assets held for sale (Note 3) (1,031) 0  
Transfers 0 0 0
Translation differences 0 0 0
Property, plant and equipment, ending balance 0 0 0
Prepayments | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Property, plant and equipment, beginning balance 0 0 0
Property, plant and equipment, ending balance 0 0 0
Prepayments | Depreciation & impairment losses      
Reconciliation of changes in property, plant and equipment [abstract]      
Property, plant and equipment, beginning balance 0 0 0
Property, plant and equipment, ending balance $ 0 $ 0 $ 0