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GOODWILL AND INTANGIBLE ASSETS - INTANGIBLE ASSETS (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Intangible assets      
Gross Amount $ 258.0 $ 258.0  
Accumulated Amortization (76.9) (66.0)  
Total Intangible Assets, net 181.1 192.0  
Aggregate intangible asset amortization 10.9 10.9 $ 11.1
Estimated amortization expenses related to intangibles      
2022 10.7    
2023 10.7    
2024 10.7    
2025 10.7    
2026 10.7    
Thereafter 100.3    
Total 153.8    
Ocean Transportation | Customer Relationships      
Intangible assets      
Gross Amount 140.6 140.6  
Accumulated Amortization (44.6) (37.9)  
Total Intangible Assets, net $ 96.0 102.7  
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 (32.3) (28.1)  
Total Intangible Assets, net 85.1 89.3  
Logistics | Trade Names [Member]      
Intangible assets      
Indefinite-Lived intangible asset 27.3 27.3  
Logistics | Span Alaska | Trade Names [Member]      
Intangible assets      
Indefinite-Lived intangible asset acquired 27.3    
Logistics | Customer Relationships      
Intangible assets      
Gross Amount 90.1 90.1  
Accumulated Amortization (32.3) (28.1)  
Total Intangible Assets, net 57.8 $ 62.0  
Net Remaining Amount $ 10.8    
Expected useful life 13 years    
Logistics | Customer Relationships | Span Alaska      
Intangible assets      
Total Intangible Assets, net $ 79.3    
Expected useful life 20 years