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RELATED PARTY TRANSACTIONS (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Related Party Transaction [Line Items]      
Related Party Transaction, Revenues from Transactions with Related Party $ 0.3    
Related Party Transaction, Due from (to) Related Party 0.1   $ 0.2
Related Party Transaction, Expenses from Transactions with Related Party $ 0.4 $ 0.6  
Equity Method Investment, Ownership Percentage 21.40%