Common Stock And Equity Based Compensation (Details 5) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
UGI Performance Units [Member]
Payment to UGI Performance Units and UGI Stock Unit awards in share and cash:
Number of original awards granted	210,750	197,917	193,983
Fiscal year granted	2009	2008	2007
Payment of Awards:
Shares of UGI Common Stock issued	0	142,494	123,169
Cash Paid	$ 0	$ 7.5	$ 2.6
UGI Stock Units [Member]
Payment to UGI Performance Units and UGI Stock Unit awards in share and cash:
Number of original awards granted	32,898	22,400	0
Payment of Awards:
Shares of UGI Common Stock issued	21,757	17,545	0
Cash Paid	$ 0.2	$ 0.2	$ 0