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RELATED PARTY TRANSACTIONS (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Related Party Transaction [Line Items]          
Related Party Transaction, Revenues from Transactions with Related Party $ 0.7 $ 0.1 $ 2.0 $ 0.6  
Related Party Transaction, Due from (to) Related Party 0.3   0.3   $ 0.1
Related Party Transaction, Expenses from Transactions with Related Party $ 0.5 $ 0.3 $ 1.5 $ 1.0