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CONTRACTUAL OBLIGATIONS AND RIGHTS (Details textuals) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Disclosure Of Contractual Obligations And Rights [Abstract]      
Contractual obligations, new building commitments $ 271.4 $ 258.0 $ 306.4
Contractual obligations, chartered in vessels $ 0.0 $ 0.0 $ 0.1