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PREPAYMENTS ON VESSELS (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items]      
Balance $ 45.5 $ 88.4 $ 88.4
Additions 75.6 25.8 38.9
Transferred to vessels (67.6) (63.9) (81.8)
Balance $ 53.5 $ 50.3 $ 45.5