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GOODWILL AND INTANGIBLES - INTANGIBLE ASSETS (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Feb. 28, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Intangible assets        
Gross Amount   $ 278.3 $ 263.2  
Total Intangible Assets, net   176.4 174.9  
Aggregate intangible asset amortization   13.6 11.4 $ 10.9
Less: Accumulated Amortization   (101.9) (88.3)  
Total estimated amortization expense related to intangibles   149.1    
Estimated amortization expenses related to intangibles        
2024   14.3    
2025   13.6    
2026   13.0    
2027   13.0    
2028   13.0    
Thereafter   82.2    
Total estimated amortization expense related to intangibles   $ 149.1    
Customer Relationships | Maximum        
Intangible assets        
Expected useful life   21 years    
Ocean Transportation | Customer Relationships        
Intangible assets        
Gross Amount   $ 140.6 140.6  
Total Intangible Assets, net   82.7 89.4  
Less: Accumulated Amortization   $ (57.9) (51.2)  
Ocean Transportation | Customer Relationships | Horizon        
Intangible assets        
Expected useful life   21 years    
Finite-Lived intangible assets acquired   $ 140.6    
Logistics        
Intangible assets        
Gross Amount   137.7 122.6  
Total Intangible Assets, net   93.7 85.5  
Less: Accumulated Amortization   (44.0) (37.1)  
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   110.4 95.3  
Total Intangible Assets, net   66.4 58.2  
Expected useful life 7 years      
Finite-Lived intangible assets acquired $ 16.5      
Less: Accumulated Amortization   $ (44.0) $ (37.1)  
Logistics | Customer Relationships | Minimum        
Intangible assets        
Expected useful life   3 years    
Logistics | Customer Relationships | Maximum        
Intangible assets        
Expected useful life   13 years    
Logistics | Customer Relationships | Span Alaska        
Intangible assets        
Total Intangible Assets, net   $ 79.3    
Expected useful life   20 years