Goodwill and Intangible Assets - Changes in the Carrying Amount of Goodwill (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2014		Sep. 30, 2013
Goodwill
Goodwill - balance at beginning of period	$ 2,873.7		$ 2,818.3
Acquisitions	9.6		12.5
Correcting adjustment	(1.8)		9.3
Foreign currency translation	(48.1)		33.6
Goodwill - balance at beginning of period	2,833.4		2,873.7
AmeriGas Propane
Goodwill
Goodwill - balance at beginning of period	1,941.0		1,919.2
Acquisitions	6.8		12.5
Correcting adjustment	(2.7)		9.3
Foreign currency translation	0		0
Goodwill - balance at beginning of period	1,945.1		1,941.0
Gas Utility
Goodwill
Goodwill - balance at beginning of period	182.1		182.1
Acquisitions	0		0
Correcting adjustment	0		0
Foreign currency translation	0		0
Goodwill - balance at beginning of period	182.1		182.1
Energy Services
Goodwill
Goodwill - balance at beginning of period	2.8		2.8
Acquisitions	2.8		0
Correcting adjustment	0		0
Foreign currency translation	0		0
Goodwill - balance at beginning of period	5.6		2.8
Antargaz
Goodwill
Goodwill - balance at beginning of period	643.7		612.0
Acquisitions	0		0
Correcting adjustment	0		0
Foreign currency translation	(42.5)		31.7
Goodwill - balance at beginning of period	601.2		643.7
Flaga & Other
Goodwill
Goodwill - balance at beginning of period	97.1		95.2
Acquisitions	0
Correcting adjustment	0.9		0
Foreign currency translation	(5.6)		1.9
Goodwill - balance at beginning of period	92.4		97.1
Corporate & Other
Goodwill
Goodwill - balance at beginning of period	7.0	[1]	7.0	[1]
Acquisitions	0		0
Correcting adjustment	0		0
Foreign currency translation	0		0
Goodwill - balance at beginning of period	$ 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) net expenses of UGI’s captive general liability insurance company, (4) UGI Corporation’s unallocated corporate and general expenses and interest income and (5) net (losses) gains on Midstream & Marketing’s unsettled commodity derivative instruments and certain settled commodity derivative instruments not associated with current period transactions, and net (losses) gains on AmeriGas Propane’s unsettled commodity derivative instruments entered into beginning April 1, 2014, totaling $(18.0), $7.4 and $15.1 in Fiscal 2014, Fiscal 2013 and Fiscal 2012, respectively. 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.