Average remaining depreciable lives of associated property.

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- Definition

Distribution System Improvement Charge, Percent of Amount Billed to Customers

+ References

No definition available.

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- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611

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- Definition

Amount of public utility's approved rate increase (decrease) by regulatory agency.

+ References

No definition available.

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- Definition

Amount of public utility's requested rate increase (decrease) with regulatory agency.

+ 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.

+ References

No definition available.

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Utility Regulatory Assets and Liabilities and Regulatory Matters - Narrative (Details) - USD ($) $ in Millions								3 Months Ended	12 Months Ended
	Jan. 26, 2018	Oct. 20, 2017	Jul. 01, 2017	Jan. 01, 2017	Oct. 19, 2016	Apr. 01, 2016	Apr. 01, 2015	Dec. 31, 2017	Sep. 30, 2014	Sep. 30, 2017	Dec. 31, 2016
Minimum
Regulatory Assets
Average remaining depreciable lives of associated property.								1 year
Maximum
Regulatory Assets
Average remaining depreciable lives of associated property.								65 years
Pennsylvania Public Utility Commission
Regulatory Assets
DSIC, percent of amount billed to customers									0.00%
Pennsylvania Public Utility Commission \| PNG
Regulatory Assets
Increase in annual base distribution rate		$ 11.3
DSIC, percent of amount billed to customers			7.50%				0.00%
Pennsylvania Public Utility Commission \| UGI Gas
Regulatory Assets
Increase in annual base distribution rate					$ 27.0
Pennsylvania Public Utility Commission \| CPG
Regulatory Assets
DSIC, percent of amount billed to customers			7.50%			0.00%
Pennsylvania Public Utility Commission \| Maximum
Regulatory Assets
DSIC, percent of amount billed to customers				5.00%
Gas Utility
Regulatory Assets
Fair value of unrealized gains (losses)								$ (1.7)		$ 0.1	$ 6.9
Forecast \| Subsequent Event \| Pennsylvania Public Utility Commission \| Electric Utility
Regulatory Assets
Requested rate increase amount	$ 9.2