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Accounts Payable And Accrued Liabilities (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Jun. 30, 2013
Accounts Payable and Accrued Liabilities [Abstract]    
Present value of asset retirement obligation $ 9.7 $ 5.7
Undiscounted value of asset retirement obligation $ 10.2 $ 6.1