Acquisitions and Dispositions (Details 2) (Heritage Propane [Member], USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Heritage Propane [Member]
Partnership unaudited consolidated results of operations
Revenues	$ 7,013.0	$ 7,522.1
Net income attributable to UGI Corporation	$ 208.4	$ 236.0
Earnings per common share attributable to UGI Corporation stockholders:
Basic (in dollars per share)	$ 1.85	$ 2.11
Diluted (in dollars per share)	$ 1.84	$ 2.09