Property, Plant and Equipment (Tables)

12 Months Ended

Sep. 30, 2019

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

At September 30, 2019, estimated useful lives by asset 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	30
Electricity generation facilities	25	40
Pipeline and related assets	25	40
Transportation equipment and office furniture and fixtures	3	10
Computer software	1	10

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

	2019		2018
Utility:
Distribution	$	3,366.2	$	3,106.6
Transmission	106.0		97.1
General and other	389.3		281.7
Work in process	76.6		130.9
Total Utility	3,938.1		3,616.3
Non-utility:
Land	183.5		191.4
Buildings and improvements	403.8		364.9
Transportation equipment	258.3		257.1
Equipment, primarily cylinders and tanks	3,455.2		3,375.4
Electric generation	326.9		319.5
Pipeline and related assets	1,150.2		473.0
Other	255.3		306.6
Work in process	101.7		57.9
Total non-utility	6,134.9		5,345.8
Total property, plant and equipment	$	10,073.0	$	8,962.1