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, 2015	Sep. 30, 2014	Sep. 30, 2013
UGI Performance Units
Share-based Compensation Arrangement by Share-based Payment Award
Number of original awards granted	294,300	331,038	328,025
Fiscal year granted	2012	2011	2010
Payment of awards:
Shares of UGI Common Stock issued	188,418	174,168	97,622
Cash paid	$ 13.3	$ 3.1	$ 1.6
UGI Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Number of original awards granted	67,419	34,639	54,269
Payment of awards:
Shares of UGI Common Stock issued	44,034	22,604	35,274
Cash paid	$ 0.8	$ 0.4	$ 0.5