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PROPERTY AND EQUIPMENT, NET - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Property, Plant and Equipment [Abstract]        
Depreciation and amortization expense on property and equipment $ 27.0 $ 15.4 $ 68.4 $ 48.2