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Accounts Payable And Accrued Liabilities (Narrative) (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Jun. 30, 2015
Accounts Payable and Accrued Liabilities [Abstract]    
Present value of asset retirement obligation $ 8.6 $ 9.2
Undiscounted value of asset retirement obligation $ 9.2 $ 9.8