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Properties, including oil and gas properties, net - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Property, Plant and Equipment [Line Items]      
Asset Impairment Charges $ 675.3 $ 83.9 $ 58.2
Oil And Gas Property Full Cost Method Cost Not Amortized 0.0 20.2  
Proved developed and undeveloped oil and natural gas properties 304.3 493.9  
Less: Accumulated depletion (38.1) (68.4)  
Total oil and natural gas properties, net 266.2 445.7  
Land, buildings and improvements 885.4 815.9  
Less: Accumulated depreciation 338.8 353.0  
Total other properties, net 546.6 462.9  
Total properties, including oil and natural gas properties, net 812.8 908.6  
Impairment of oil and natural gas properties 485.1 81.0 54.3
Land, buildings and improvements      
Property, Plant and Equipment [Line Items]      
Land, buildings and improvements 193.5 166.9  
Gas gathering assets      
Property, Plant and Equipment [Line Items]      
Land, buildings and improvements 20.9 21.1  
Machinery, equipment and other      
Property, Plant and Equipment [Line Items]      
Land, buildings and improvements 521.9 496.3  
Assets Held under Capital Leases [Member]      
Property, Plant and Equipment [Line Items]      
Land, buildings and improvements 97.3 99.3  
Construction in progress      
Property, Plant and Equipment [Line Items]      
Land, buildings and improvements 51.8 32.3  
Unproved Oil and Natural Gas Properties and Development Costs Not Being Amortized | Compass      
Property, Plant and Equipment [Line Items]      
Capitalized Costs, Unproved Properties   20.2  
Energy Segment [Member]      
Property, Plant and Equipment [Line Items]      
Asset Impairment Charges 485.1 81.0 54.3
Total properties, including oil and natural gas properties, net $ 288.9 464.4  
Impairment of oil and natural gas properties   $ 81.0 $ 54.3