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CONTRACTUAL OBLIGATIONS AND RIGHTS (Details textuals) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Disclosure Of Contractual Obligations And Rights [Abstract]      
Contractual obligations, new building commitments $ 296.4 $ 306.9 $ 238.0
Contractual obligations, chartered in vessels 0.0 2.9 4.0
Contractual rights charter hire income from vessels $ 13.8 $ 50.2 $ 46.6