Utility Regulatory Assets and Liabilities and Regulatory Matters (Details Textual) (USD $) In Millions, unless otherwise specified				0 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011	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	Dec. 31, 2012 Allentown Incident [Member] UGI Utilities [Member]	Dec. 31, 2012 Revised Penalty [Member] Allentown Incident [Member] UGI Utilities [Member]
Regulatory Assets [Line Items]
Gas utility unrealized gains or losses on derivative financial instruments contracts	$ (0.4)	$ 5.3	$ (2.6)
Fair Value of Electric Utility Electricity Supply Contracts	8.2	9.2	13.5
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