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VESSELS AND CAPITALIZED DRY-DOCKING (Detail Textuals) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items]          
Depreciation expense relates to administrative expense $ 28.7 $ 28.6 $ 85.9 $ 86.3 $ 114.5
Impairment loss assets-held-for-sale $ 1.3        
Vessels and capitalized dry docking          
Disclosure of detailed information about property, plant and equipment [line items]          
Capitalized dry-docking costs     59.9 70.8 68.1
Other property, plant and equipment          
Disclosure of detailed information about property, plant and equipment [line items]          
Depreciation expense relates to administrative expense     $ 0.6 $ 0.5 $ 0.9