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VESSEL AND CAPITALIZED DRY-DOCKING - Schedule of Vessel and Capitalized Dry-Docking (Details) - Vessels and capitalized dry-docking - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Reconciliation of changes in property, plant and equipment      
Beginning of period $ 2,070.2    
Disposals 58.5 $ 11.7 $ 111.4
End of period 2,528.7 2,149.4 2,070.2
Cost:      
Reconciliation of changes in property, plant and equipment      
Beginning of period 2,622.1 2,421.2 2,421.2
Additions 428.3 352.1 476.0
Disposals 7.2 23.0 31.9
Transferred from prepayments 141.0 33.0 40.6
Transferred to assets held for sale 43.7 39.1 283.8
End of period 3,140.5 2,744.2 2,622.1
Depreciation:      
Reconciliation of changes in property, plant and equipment      
Beginning of period (536.3) (543.8) (543.8)
Disposals (7.2) (22.7) (31.9)
Depreciation for the period 87.5 69.2 143.7
Transferred to assets held for sale (19.5) (16.0) (119.3)
End of period (597.1) (574.3) (536.3)
Impairment:      
Reconciliation of changes in property, plant and equipment      
Beginning of period (15.6) (21.5) (21.5)
Transferred to assets held for sale (0.9) (1.0) (5.9)
End of period $ (14.7) $ (20.5) $ (15.6)