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Properties, including oil and gas properties, net (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 1 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2013
Land, buildings and improvements
Sep. 30, 2012
Land, buildings and improvements
Sep. 30, 2013
Gas gathering assets
Sep. 30, 2012
Gas gathering assets
Sep. 30, 2013
Machinery, equipment and other
Sep. 30, 2012
Machinery, equipment and other
Sep. 30, 2013
Construction in progress
Sep. 30, 2012
Construction in progress
Sep. 30, 2013
EXCO/HGI JV
Property, Plant and Equipment [Line Items]                        
Unproved oil and natural gas properties and development costs not being amortized $ 36.4 $ 0                    
Proved developed and undeveloped oil and natural gas properties 546.0 0                    
Less: Accumulated depletion (30.1) 0                    
Total oil and natural gas properties, net 552.3 0                    
Land, buildings and improvements 726.0 437.7   169.8 93.6 21.1 0 488.3 325.7 46.8 18.4  
Less: Accumulated depreciation 285.0 216.1                    
Total other properties, net 441.0 221.6                    
Total properties, including oil and natural gas properties, net 993.3 221.6                    
Impairment of oil and natural gas properties $ 54.3 $ 0 $ 0                 $ 54.3