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SIGNIFICANT ACCOUNTING POLICIES - INVESTMENT IN SSAT (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Investments in affiliates      
Investment in Terminal Joint Venture $ 74.3   $ 76.2
Financial information for equity method investment      
Company Share of Net Income 4.0 $ 8.5  
Ocean Transportation      
Financial information for equity method investment      
Company Share of Net Income 4.0 8.5  
SSAT      
Investments in affiliates      
Increase in investment in SSAT 2.2    
Investment in Terminal Joint Venture 74.3   $ 76.2
Financial information for equity method investment      
Operating revenue 278.9 268.1  
Operating costs and expenses (265.4) (244.2)  
Operating Income 13.5 23.9  
Net Income $ 13.0 $ 22.5