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, except Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
UGI Performance Units
Share-based Compensation Arrangement by Share-based Payment Award
Number of original awards granted	331,038	328,025	316,125
Fiscal year granted	2011	2010	2009
Payment of awards:
Shares of UGI Common Stock issued	174,168	97,622	0
Cash paid	$ 3.1	$ 1.6	$ 0
UGI Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Number of original awards granted	34,639	54,269	49,347
Payment of awards:
Shares of UGI Common Stock issued	22,604	35,274	32,636
Cash paid	$ 0.4	$ 0.5	$ 0.2