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FREIGHT RECEIVABLES (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial assets that are either past due or impaired [line items]        
Total net $ 89.9 $ 86.0 $ 71.3  
Cost        
Disclosure of financial assets that are either past due or impaired [line items]        
Total net 93.6 87.7 72.6  
Accumulated impairment        
Disclosure of financial assets that are either past due or impaired [line items]        
Total net 3.7 1.7 1.3 $ 2.6
Financial assets not yet due | Cost        
Disclosure of financial assets that are either past due or impaired [line items]        
Total net 39.8 44.0 25.5  
Financial assets past due but not impaired | Due before 30 days | Cost        
Disclosure of financial assets that are either past due or impaired [line items]        
Total net 22.5 18.8 26.0  
Financial assets past due and impaired | Due between 30 and 180 days | Cost        
Disclosure of financial assets that are either past due or impaired [line items]        
Total net 25.3 20.5 18.4  
Financial assets past due and impaired | Due after 180 days | Cost        
Disclosure of financial assets that are either past due or impaired [line items]        
Total net $ 6.0 $ 4.4 $ 2.7