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LEASES - Rental Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income and Expenses, Lessee [Abstract]      
Operating Lease, Expense $ 3.3 $ 3.0  
Operating Leases, Rent Expense, Net     $ 2.5