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VESSELS AND CAPITALIZED DRY-DOCKING (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Reconciliation of changes in property, plant and equipment [abstract]      
Balance $ 1,960.9    
Balance 1,850.4 $ 1,924.2 $ 1,960.9
Vessels and capitalized dry docking      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance 1,937.8    
Impairment losses on tangible fixed assets 2.8    
Balance 1,836.8 1,878.3 1,937.8
Vessels and capitalized dry docking | Gross      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance 2,443.3 2,160.1 2,160.1
Additions 14.4 224.3 290.3
Disposals 1.7 15.2 40.9
Transferred from prepayments 50.8 1.6 78.6
Transferred to assets held-for-sale 172.6 17.2 44.8
Balance 2,334.2 2,353.6 2,443.3
Vessels and capitalized dry docking | Depreciation      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance (475.0) (406.2) (406.2)
Disposals (1.7) (15.2) (40.9)
Depreciation for the year 67.3 59.8 126.2
Transferred to assets held-for-sale (63.7) (6.5) (16.5)
Balance (476.9) (444.3) (475.0)
Vessels and capitalized dry docking | Impairment      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance (30.5) (31.4) (31.4)
Impairment losses on tangible fixed assets 2.8 0.8 4.6
Transferred to assets held-for-sale (12.8) (1.2) (5.5)
Balance $ (20.5) $ (31.0) $ (30.5)