Income Taxes (Details Textual) (USD $) In Millions	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009	Sep. 30, 2008
Income Taxes [Line Items]
Deferred tax assets relating to operating loss carryforwards	$ 31.8	$ 25.5
Unrecognized income tax benefits	6.3	5.4	2.3	4.9
Income Taxes (Textual) [Abstract]
Foreign Tax Credits	15.6	2.1	34.9
Increase in valuation allowance	3.5
Unusable net operating losses obtained in connection with overseas acquisitions	3.2
Increase in unusable state operating losses	1.5
Decrease in foreign tax credit carryforwards	1.2
Accrued interest included in unrecognized income tax benefits	0.2
Valuation allowance provided for deferred tax assets related to state net operating loss carryforwards and other state deferred tax assets of certain subsidiaries	15.6
Unrecognized tax benefits if recognized would impact the reported effective tax rate	1.6
Tax positions for which the deductibility is highly certain but uncertainty about the timing	4.8
Amount of reasonably possible changes in unrecognized tax benefits and related interest in the next twelve months	4.2
UGI Utilities [Member] | PENNSYLVANIA | State and Local Jurisdiction [Member]
Income Taxes [Line Items]
State Net Operating Loss carryforwards	43.4
PENNSYLVANIA
Income Taxes [Line Items]
Operating loss carry forwards expiration dates Pennsylvania	20 years
PENNSYLVANIA | New Tax Method [Member]
Income Taxes [Line Items]
Federal and state income tax benefits resulted from filing tax returns using the new tax method			30.2
Maximum [Member]
Income Taxes [Line Items]
State and other income tax returns subject to examination in US	P5Y
Minimum [Member]
Income Taxes [Line Items]
State and other income tax returns subject to examination in US	P3Y
Flaga [Member]
Income Taxes [Line Items]
Deferred tax assets relating to operating loss carryforwards	10.6
Flaga [Member] | Foreign Country [Member]
Income Taxes [Line Items]
State Net Operating Loss carryforwards	46.0
UGI Utilities [Member] | State and Local Jurisdiction [Member]
Income Taxes [Line Items]
State net operating loss carryforward remains	29.3
Antargaz [Member]
Income Taxes [Line Items]
Deferred tax assets relating to operating loss carryforwards	1.9
Valuation allowance provided for deferred tax assets related to certain operations of Antargaz and UGI International Holdings, B.V. Operating activities and tax deductions related to the exercise of non-qualified stock options contributed to the state net operating losses	6.2
Antargaz [Member] | Foreign Country [Member]
Income Taxes [Line Items]
State Net Operating Loss carryforwards		5.5
AmeriGas Propane [Member]
Income Taxes [Line Items]
Deferred tax assets relating to operating loss carryforwards	2.7
UGI International Holdings [Member]
Income Taxes [Line Items]
Deferred tax assets relating to operating loss carryforwards	1.0
Other Subsidiaries [Member]
Income Taxes [Line Items]
Deferred tax assets relating to operating loss carryforwards	15.6
Foreign Country [Member]
Income Taxes [Line Items]
Foreign tax credit carryforwards	60.1
State and Local Jurisdiction [Member]
Income Taxes [Line Items]
State Net Operating Loss carryforwards	177.9
New Tax Method [Member]
Income Taxes [Line Items]
State Net Operating Loss carryforwards	7.4
Unrecognized income tax benefits	$ 1.2	$ 3.9	$ 0