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Inventory (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Inventory [Abstract]    
Current assets inventory, underground storage $ 6.2 $ 7.8
Current assets inventory, tubulars & other equipment 24.4 38.4
Other assets non-current inventory, gathering systems pipe $ 17.8 $ 19.5