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VESSELS AND CAPITALIZED DRY-DOCKING (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Reconciliation of changes in property, plant and equipment [abstract]      
Balance $ 1,384.8    
Balance 1,426.8 $ 1,404.1 $ 1,384.8
Vessels and capitalized dry docking      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance 1,294.5    
Balance 1,365.5 1,319.7 1,294.5
Vessels and capitalized dry docking | Gross      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance 1,726.6 1,697.4 1,697.4
Additions 106.6 93.9 103.1
Disposals (15.2) (9.3) (14.3)
Transferred from prepayments 63.9 0.0 0.0
Transferred to assets held-for-sale (22.8) (49.7) (59.6)
Balance 1,859.0 1,732.3 1,726.6
Vessels and capitalized dry docking | Depreciation:      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance 258.5 180.0 180.0
Disposals (15.2) (9.3) (14.3)
Depreciation for the period 85.1 85.8 113.6
Transferred to assets held-for-sale (8.5) (17.5) (20.8)
Balance 319.9 239.0 258.5
Vessels and capitalized dry docking | Impairment:      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance 173.6 173.6 173.6
Impairment losses on tangible fixed assets 1.3 2.6 3.6
Transferred to assets held-for-sale (1.3) (2.6) (3.6)
Balance $ 173.6 $ 173.6 $ 173.6