Property, Plant and Equipment (Tables)

12 Months Ended

Sep. 30, 2017

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

September 30, 2017, estimated useful lives by type were as follows:

Asset Type	Minimum Estimated Useful Life (in years)	Maximum Estimated Useful Life (in years)
Buildings and improvements	10	40
Equipment, primarily cylinders and tanks	5	40
Electricity generation facilities	25	40
Pipeline and related assets	25	40
Transportation equipment and office furniture and fixtures	3	12
Computer software	1	10

Property, plant and equipment comprise the following at September 30:

	2017		2016
Utilities:
Distribution	$	2,835.3	$	2,634.2
Transmission	96.4		93.5
Work in process	112.6		103.9
General and other	241.0		167.3
Total Utilities	3,285.3		2,998.9
Non-utility:
Land	180.1		169.9
Buildings and improvements	351.2		382.2
Transportation equipment	289.3		301.7
Equipment, primarily cylinders and tanks	3,529.4		3,421.5
Electric generation	310.0		309.4
Pipeline and related assets	454.5		235.8
Work in process	95.3		201.6
Other	354.8		324.3
Total non-utility	5,564.6		5,346.4
Total property, plant and equipment	$	8,849.9	$	8,345.3