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CONTRACTUAL RIGHTS AND OBLIGATIONS - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2019
Contractual Obligations [Line Items]      
Direct issuance costs for borrowings $ 8.0 $ 5.1  
Borrowing costs capitalized 5.8 1.1  
Lease liabilities included under "Borrowings" $ 30.6 $ 25.3 $ 35.2
Average period until redelivery of the vessels 1 year 9 months 18 days  
Land and buildings and other plant and operating equipment      
Contractual Obligations [Line Items]      
Lease liabilities included under "Borrowings" $ 0.0 $ 8.7  
Vessels and capitalized dry-docking      
Contractual Obligations [Line Items]      
Lease liabilities included under "Borrowings" $ 21.9 $ 25.3