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FINANCE LEASE LIABILITY (Narrative) (Details)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
containership
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
containership
Other Long-term Liabilities [Line Items]      
Number of container vessels under sale and leaseback transactions | containership 7   7
Number of vessels under finance lease liability accounted for as vessels under finance lease | containership 7    
Finance lease, vessel bareboat charter period     15 years
Disposal group, finance lease liability | $     $ 464.7
Interest incurred on capital leases | $ $ 13.1 $ 30.1  
Disposal Group, Disposed of by Sale, Not Discontinued Operations | River Box Holding Inc. ("River Box")      
Other Long-term Liabilities [Line Items]      
Subsidiary, percentage ownership sold (in percentage)     50.10%