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Summary of Significant Accounting Policies - Average Composite Depreciation Rates (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Public Utility, Property, Plant and Equipment [Line Items]
Regulatory assets	$ 3.7	$ 6.3
Depreciation	$ 388.5	$ 396.5	$ 365.5
Amortization period	5 years
Gas Utility
Public Utility, Property, Plant and Equipment [Line Items]
Average composite depreciation rates	2.20%	2.30%	2.20%
Electric Utility
Public Utility, Property, Plant and Equipment [Line Items]
Average composite depreciation rates	2.10%	2.20%	2.40%
UGI Utilities
Public Utility, Property, Plant and Equipment [Line Items]
Regulatory assets	$ 395.6	$ 301.0
Computer software | UGI Utilities
Public Utility, Property, Plant and Equipment [Line Items]
Useful life (in years)	15 years

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- Definition

Public Utilities, Retired Property, Plant and Equipment, Amortization Period

+ References

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- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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- Definition

Composite depreciation rate for public utility plants in service.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382

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