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VESSELS AND CAPITALIZED DRY-DOCKING (Detail Textuals) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items]          
Depreciation expense relates to administrative expense $ 26.3 $ 28.9 $ 53.0 $ 57.2 $ 114.5
Impairment loss assets-held-for-sale     2.7    
Vessels and capitalized dry docking          
Disclosure of detailed information about property, plant and equipment [line items]          
Capitalized dry-docking costs     55.1 62.1 67.5
Other property, plant and equipment          
Disclosure of detailed information about property, plant and equipment [line items]          
Depreciation expense relates to administrative expense     $ 0.5 $ 0.5 $ 1.1