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	$ 7,010.9	$ 7,522.0
Net income attributable to UGI Corporation	$ 197.6	$ 223.5
Earnings per common share attributable to UGI Corporation stockholders:
Basic (in dollars per share)	$ 1.76	$ 2.00
Diluted (in dollars per share)	$ 1.74	$ 1.98