Utility Regulatory Assets and Liabilities and Regulatory Matters (Details Textual) (USD $) In Millions, unless otherwise specified				0 Months Ended
	Mar. 31, 2013	Sep. 30, 2012	Mar. 31, 2012	Oct. 03, 2012 Allentown, Pennsylvania Natural Gas Explosion [Member] UGI Utilities [Member]	Feb. 09, 2011 Allentown, Pennsylvania Natural Gas Explosion [Member] UGI Utilities [Member] Person	Mar. 31, 2013 Allentown Incident [Member] UGI Utilities [Member]	Mar. 31, 2013 Revised Penalty [Member] Allentown Incident [Member] UGI Utilities [Member]
Regulatory Assets [Line Items]
Gas utility unrealized gains or losses on derivative financial instruments contracts	$ 4.1	$ 5.3	$ (3.1)
Fair Value of Electric Utility Electricity Supply Contracts	(5.5)	(9.2)	(14.7)
Loss Contingency, Deaths From Natural Gas Explosion					5
Penalty assessed						0.4	0.5
Site Contingency, Accelerated Time Frame Replacing Remainder of Cast-Iron Mains				14 years
Loss Contingency, Agreement Permitted To Retain Current Timeframe for Replacing The Remainder of Their Bare Steel Mains				30 years
Net Book Value of Asset Transferred	$ 0