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RELATED PARTY TRANSACTIONS (Schedule of Revenue and Expense Transactions) (Details) - OVS [Member] - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Related Party Transaction [Line Items]        
Revenues $ 1.8 $ 1.5 $ 3.7 $ 3.1
Operating costs $ 0.6 $ 0.1 $ 1.2 $ 0.2