Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Millions	Sep. 30, 2015	Sep. 30, 2014
Property, Plant and Equipment
Utilities	$ 2,753.5	$ 2,568.5
Non-utility	5,075.6	4,608.2
Total property, plant and equipment	7,829.1	7,176.7
Distribution
Property, Plant and Equipment
Utilities	2,458.1	2,294.6
Transmission
Property, Plant and Equipment
Utilities	90.0	88.2
General and Other, Including Work-in-Process
Property, Plant and Equipment
Utilities	205.4	185.7
Land
Property, Plant and Equipment
Non-utility	174.9	170.2
Building and Improvements
Property, Plant and Equipment
Non-utility	391.4	317.4
Transportation Equipment
Property, Plant and Equipment
Non-utility	327.9	288.4
Equipment, Primarily Cylinders and Tanks
Property, Plant and Equipment
Non-utility	3,268.1	3,042.7
Electric Generation
Property, Plant and Equipment
Non-utility	305.7	273.4
Pipeline and Related Assets
Property, Plant and Equipment
Non-utility	233.5	162.3
Other, Including Work-in-Process
Property, Plant and Equipment
Non-utility	$ 374.1	$ 353.8

Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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