Segment Information - Reconciliation of Partnership EBITDA to AmeriGas Propane Operating Income (Details) - USD ($) $ in Millions		3 Months Ended										12 Months Ended
		Sep. 30, 2015	Jun. 30, 2015	[1]	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	[2]	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Reconciliation of partnership EBITDA
Depreciation and amortization												$ (374.1)	$ (362.9)	$ (363.1)
Operating income		$ (6.6)	$ 56.1		$ 702.1	$ 83.3	$ (9.4)	$ 62.7	$ 588.6	$ 363.7		834.9	$ 1,005.6	831.1
General Partner interest in AmeriGas OLP (percentage)													1.01%
AmeriGas Propane
Reconciliation of partnership EBITDA
Partnership Adjusted EBITDA												619.2	$ 664.8	596.5
Depreciation and amortization												(194.9)	(197.2)	(205.9)
Noncontrolling interests	[3]											3.3	4.4	3.8
Operating income												$ 427.6	$ 472.0	$ 394.4

[1] Includes loss on early extinguishment of debt at Antargaz which decreased net income attributable to UGI Corporation by $4.6 or $0.03 per diluted share (see Note 6)

[2] Includes income tax expense of $5.7 to reflect the retroactive effects to Fiscal 2013 of new tax legislation in France regarding the deductibility of certain interest expense which decreased net income attributable to UGI Corporation by $5.7 or $0.03 per diluted share (see Note 7).

[3] Principally represents the General Partner’s 1.01% interest in AmeriGas OLP.