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PROPERTY, PLANT AND EQUIPMENT, NET - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [abstract]    
Expense relating to variable lease payments not included in measurement of lease liabilities $ 10.6 $ 17.4
Expense relating to short-term leases for which recognition exemption has been used $ 0.8 $ 3.4