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Accounts Payable And Accrued Liabilities (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Jun. 30, 2011
Accounts Payable and Accrued Liabilities [Abstract]    
Acquisition accruals $ 1.9 $ 3.3
Present value of asset retirement obligation 4.3 6.1
Undiscounted value of asset retirement obligation $ 4.8 $ 6.5