Income Taxes (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended				12 Months Ended				12 Months Ended		12 Months Ended											3 Months Ended	1 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2014 Foreign Tax Credits	Sep. 30, 2014 Foreign Operating Loss Carryforwards	Sep. 30, 2014 State Operating Loss Benefits	Sep. 30, 2014 Accrued Interest Included	Sep. 30, 2012 Foreign Country	Sep. 30, 2014 Foreign Country	Sep. 30, 2014 State and Local Jurisdiction	Sep. 30, 2013 State and Local Jurisdiction	Sep. 30, 2012 State and Local Jurisdiction	Sep. 30, 2014 UGI International Holdings	Sep. 30, 2014 AmeriGas Propane	Sep. 30, 2014 Other Subsidiaries	Sep. 30, 2014 UGI International	Sep. 30, 2014 Flaga	Sep. 30, 2014 Flaga Foreign Country	Sep. 30, 2014 Antargaz	Sep. 30, 2014 Antargaz Foreign Country	Dec. 31, 2013 FRANCE Foreign Country	Dec. 31, 2013 FRANCE Antargaz Foreign Country
Income Taxes
Decrease in unusable foreign tax credits	$ 12.1	$ 34.9	$ 5.2
Income tax expense																						5.7	5.7
Income Tax Reconciliation, Change in Deferred Tax Assets Valuation Allowance									4.6
Undistributed Earnings of Foreign Subsidiaries	42.7
State Net Operating Loss carryforwards											171.9				16.8				37.4		8.2
Effect on income tax expense (benefit) of state tax flow through of accelerated depreciation											(2.0)	(1.5)	(3.2)
Deferred tax assets relating to operating loss carryforwards	27.9	32.1												0.8	6.5	9.5		8.4		2.7
Valuation allowance provided for deferred tax assets related to state net operating loss carryforwards and other state deferred tax assets of certain subsidiaries	15.1
Valuation allowance operating loss carryforwards related to acquisition																	3.0
Deferred tax assets and associated valuation allowance for unrealized state tax benefits for equity compensation deductions											6.7	5.9
Foreign tax credit carryforwards										47.8
Increase (decrease) in valuation allowance	38.4				34.0	4.8	(0.4)
Unrecognized income tax benefits	2.4	3.4	2.9	6.3				2.5
Accrued interest included in unrecognized income tax benefits	0.1
Unrecognized tax benefits if recognized would impact the reported effective tax rate	2.5
Expected change in unrecognized tax benefits and related interest	$ 0.6