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Common Stock and Equity-Based Compensation - Schedule of Payment for UGI Performance Unit and UGI Stock Unit Awards in Shares and Cash (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
UGI Performance Units
Share-based Compensation Arrangement by Share-based Payment Award
Number of original awards granted (in shares)	308,362	294,300	331,038
Fiscal year granted	2013	2012	2011
Payment of awards:
Shares of UGI Common Stock issued, net of shares withheld for taxes (in shares)	209,592	188,418	174,168
Cash paid	$ 13.9	$ 13.3	$ 3.1
UGI Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Number of original awards granted (in shares)	51,037	67,419	34,639
Payment of awards:
Shares of UGI Common Stock issued, net of shares withheld for taxes (in shares)	39,422	44,034	22,604
Cash paid	$ 0.7	$ 0.8	$ 0.4

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+ References

No definition available.

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- Definition

Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (k)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Number of share instruments newly issued under a share-based compensation plan.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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