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SIGNIFICANT ACCOUNTING POLICIES - PROPERTY AND EQUIPMENT AND OTHER (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Impairment of Investment      
Impairment charges related to investment in SSAT $ 0.0 $ 0.0 $ 0.0
Capitalized Interest      
Interest Costs Capitalized $ 15.6 $ 18.7 $ 7.5
Dry-docking      
Number of dry-docking inspections to be made within a specified period | item 2    
Dry-dock inspections interval, minimum 36 months    
Minimum      
Dry-docking      
Period within which number of specified dry-docking inspections to be made 2 years    
Maximum      
Dry-docking      
Period within which number of specified dry-docking inspections to be made 5 years    
Vessels      
Depreciation      
Useful life 40 years    
Machinery And Equipment      
Depreciation      
Useful life 30 years    
Terminal Facilities      
Depreciation      
Useful life 35 years