Income Taxes (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended					12 Months Ended
	Sep. 30, 2012	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2009	Sep. 30, 2012 Accrued Interest Included [Member]	Sep. 30, 2012 Foreign Country [Member]	Sep. 30, 2012 State and Local Jurisdiction [Member]	Sep. 30, 2011 State and Local Jurisdiction [Member]	Sep. 30, 2010 State and Local Jurisdiction [Member]	Sep. 30, 2012 New Tax Method [Member]	Sep. 30, 2012 Flaga [Member]	Sep. 30, 2012 Flaga [Member] Foreign Country [Member]	Sep. 30, 2012 Antargaz [Member]	Sep. 30, 2012 Antargaz [Member] Foreign Country [Member]	Sep. 30, 2012 UGI International Holdings [Member]	Sep. 30, 2012 AmeriGas Propane [Member]	Sep. 30, 2012 Other Subsidiaries [Member]
Income Taxes [Line Items]
Decrease in unusable foreign tax credits	$ 5.2	$ 2.1
Income Tax Reconciliation, Change in Deferred Tax Assets Valuation Allowance						4.6
State Net Operating Loss carryforwards							213.3			18.6		50.2		5.3
Income Tax Expense (Benefit), Accelerated Depreciation							(3.2)	(7.9)	(2.5)
Deferred tax assets relating to operating loss carryforwards	38.0		31.8								12.1		1.8		0.9	5.2	17.9
Valuation allowance provided for deferred tax assets related to state net operating loss carryforwards and other state deferred tax assets of certain subsidiaries	17.2
Valuation allowance operating loss carryforwards related to acquisition																1.0
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													7.9
Foreign tax credit carryforwards						55.5
Increase (decrease) in valuation allowance	(0.3)
Foreign Income Tax Expense (Benefit), Unused Foreign Tax Credit	(4.6)
Unusable net operating losses obtained in connection with overseas acquisitions	1.7
Increase in unusable state operating losses	1.6
Unusable Net Operating Losses In Connection With Business Acquisition	1.0
Unrecognized income tax benefits	2.9	5.4	6.3	2.3	3.1
Accrued interest included in unrecognized income tax benefits	0.2
Unrecognized tax benefits if recognized would impact the reported effective tax rate	1.9
Tax positions for which the deductibility is highly certain but uncertainty about the timing	$ 1.1