Goodwill and Intangible Assets (Details 1) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2013		Sep. 30, 2012
Changes in the carrying amount of goodwill
Goodwill, Beginning Balance	$ 2,818.3		$ 1,562.2
Goodwill acquired	12.5		1,283.2
Purchase accounting adjustments	9.3		(0.2)
Foreign currency translation	33.6		(26.9)
Goodwill, Ending Balance	2,873.7		2,818.3
AmeriGas Propane [Member]
Changes in the carrying amount of goodwill
Goodwill, Beginning Balance	1,919.2		696.3
Goodwill acquired	12.5		1,223.1
Purchase accounting adjustments	9.3		(0.2)
Foreign currency translation	0		0
Goodwill, Ending Balance	1,941.0		1,919.2
Gas Utility [Member]
Changes in the carrying amount of goodwill
Goodwill, Beginning Balance	182.1		182.1
Goodwill acquired	0		0
Purchase accounting adjustments
Foreign currency translation	0		0
Goodwill, Ending Balance	182.1		182.1
Energy Services [Member]
Changes in the carrying amount of goodwill
Goodwill, Beginning Balance	2.8		2.8
Goodwill acquired	0		0
Purchase accounting adjustments	0		0
Foreign currency translation	0		0
Goodwill, Ending Balance	2.8		2.8
Antargaz [Member]
Changes in the carrying amount of goodwill
Goodwill, Beginning Balance	612.0		591.8
Goodwill acquired	0		46.4
Purchase accounting adjustments	0		0
Foreign currency translation	31.7		(26.2)
Goodwill, Ending Balance	643.7		612.0
Flaga & Other [Member]
Changes in the carrying amount of goodwill
Goodwill, Beginning Balance	95.2		82.2
Goodwill acquired	0		13.7
Purchase accounting adjustments
Foreign currency translation	1.9		(0.7)
Goodwill, Ending Balance	97.1		95.2
Corporate & Other [Member]
Changes in the carrying amount of goodwill
Goodwill, Beginning Balance	7.0	[1]	7.0	[1]
Goodwill acquired	0		0
Purchase accounting adjustments	0		0
Foreign currency translation	0		0
Goodwill, Ending Balance	$ 7.0	[1]	$ 7.0	[1]

[1] Corporate & Other results principally comprise (1) Electric Utility, (2) Enterprises’ heating, ventilation, air-conditioning, refrigeration and electrical contracting businesses (“HVAC”), (3) changes in the fair values of Midstream & Marketing’s unsettled commodity derivative instruments and gains and losses on settled commodity derivative instruments not associated with current period transactions, (4) net expenses of UGI’s captive general liability insurance company, and (5) UGI Corporation’s unallocated corporate and general expenses and interest income. Corporate & Other assets principally comprise cash, short-term investments, the assets of Electric Utility and HVAC, and an intercompany loan. The intercompany loan and associated interest is removed in the segment presentation.