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GOODWILL AND INTANGIBLE ASSETS - INTANGIBLE ASSETS (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Intangible assets      
Gross Amount $ 258.0 $ 258.0  
Accumulated Amortization (66.0) (55.1)  
Net Amount 192.0 202.9  
Aggregate intangible asset amortization 10.9 11.1 $ 11.2
Estimated amortization expenses related to intangibles      
2021 10.9    
2022 10.7    
2023 10.7    
2024 10.7    
2025 10.7    
Thereafter 111.0    
Total 164.7    
Ocean Transportation | Customer Relationships.      
Intangible assets      
Gross Amount 140.6 140.6  
Accumulated Amortization (37.9) (31.2)  
Net Amount $ 102.7 109.4  
Ocean Transportation | Customer Relationships. | Horizon      
Intangible assets      
Expected useful life 21 years    
Finite-Lived intangible assets acquired $ 140.6    
Logistics      
Intangible assets      
Gross Amount 117.4 117.4  
Accumulated Amortization (28.1) (23.9)  
Net Amount 89.3 93.5  
Logistics | Trade Names      
Intangible assets      
Indefinite-Lived intangible asset 27.3 27.3  
Logistics | Span Alaska | Trade Names      
Intangible assets      
Indefinite-Lived intangible asset acquired 27.3    
Logistics | Customer Relationships.      
Intangible assets      
Gross Amount 90.1 90.1  
Accumulated Amortization (28.1) (23.9)  
Net Amount 62.0 $ 66.2  
Net Remaining Amount $ 10.8    
Expected useful life 13 years    
Logistics | Customer Relationships. | Span Alaska      
Intangible assets      
Net Amount $ 79.3    
Expected useful life 20 years