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Accounts Payable And Accrued Liabilities - Narrative (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Jun. 30, 2016
Accounts Payable and Accrued Liabilities [Abstract]    
Present value of asset retirement obligation $ 12.7 $ 8.6
Undiscounted value of asset retirement obligation $ 14.2 $ 9.2