XML 17 R55.htm IDEA: XBRL DOCUMENT v2.4.0.6
Accounts Payable And Accrued Liabilities (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Jun. 30, 2011
Accounts Payable and Accrued Liabilities [Abstract]    
Present value of asset retirement obligation $ 4.6 $ 6.1
Undiscounted value of asset retirement obligation $ 5.1 $ 6.5