Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended										12 Months Ended
	Sep. 30, 2013		Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012		Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2011
Segment Reporting Information [Line Items]
Revenues	$ 1,259.0		$ 1,374.3	$ 2,542.7	$ 2,018.7	$ 1,126.0		$ 1,280.7	$ 2,427.8	$ 1,686.8	$ 7,194.7		$ 6,521.3		$ 6,090.9
Cost of sales											4,324.4		4,099.1		3,982.7
Operating income	(12.3)		41.5	507.7	294.2	(15.0)		3.2	385.0	165.4	831.1		538.6		642.4
Loss from equity investees	(0.5)			0.1		(0.1)		(0.1)		(0.1)	(0.4)		(0.3)		(0.9)
Loss on extinguishments of debt						0		0.1	(13.4)	0			(13.3)		(38.1)
Interest expense	(59.5)		(59.2)	(60.1)	(61.5)	(61.0)		(60.9)	(62.5)	(36.0)	(240.3)		(220.4)		(138.0)
Income before income taxes											590.4		304.6		465.4
Net income attributable to UGI	(14.2)		9.1	180.7	102.5	(6.3)		5.3	136.3	74.9	278.1		210.2		245.4
Depreciation and amortization											363.1		315.0		227.7
Noncontrolling interests’ net income (loss)	(44.9)		(31.9)	161.0	65.3	(62.1)		(67.1)	95.6	21.1	149.5		(12.5)		74.6
Total assets	10,008.8					9,676.9					10,008.8		9,676.9		6,660.9
Bank loans	227.9					165.1					227.9		165.1		138.7
Capital expenditures											489.1		343.2		355.6
Investments in equity investees	0.3					0.3					0.3		0.3		0.3
Goodwill	2,873.7					2,818.3					2,873.7		2,818.3		1,562.2
Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues											(223.8)	[1]	(178.8)	[1]	(233.0)	[1]
Cost of sales											(217.5)	[1]	(174.0)	[1]	(228.6)	[1]
Operating income											(1.1)		0		0
Loss from equity investees											0		0		0
Loss on extinguishments of debt													0		0
Interest expense											0		0		0
Income before income taxes											(1.1)		0		0
Net income attributable to UGI											(0.6)		0		0
Depreciation and amortization											0		0		0
Noncontrolling interests’ net income (loss)											0		0		0
Total assets	(100.3)					(104.1)					(100.3)		(104.1)		(93.3)
Bank loans	0					0					0		0		0
Capital expenditures											(1.1)		0		0
Investments in equity investees	0					0					0		0		0
Goodwill	0					0					0		0		0
AmeriGas Propane [Member]
Segment Reporting Information [Line Items]
Revenues											3,168.8		2,921.5		2,538.2
Cost of sales											1,657.2		1,722.4		1,605.4
Operating income											394.4		168.7		241.6
Loss from equity investees											0		0		0
Loss on extinguishments of debt													(13.3)		(38.1)
Interest expense											(166.6)		(141.5)		(63.5)
Income before income taxes											227.8		13.9		140.0
Net income attributable to UGI											47.5		15.4		39.5
Depreciation and amortization											205.9		168.1		94.5
Noncontrolling interests’ net income (loss)											149.6		(12.7)		74.3
Partnership EBITDA (a)											596.5	[2]	322.1	[2]	295.6	[2]
Total assets	4,429.3					4,533.8					4,429.3		4,533.8		1,798.0
Bank loans	116.9					49.9					116.9		49.9		95.5
Capital expenditures											111.1		103.1		77.2
Investments in equity investees	0					0					0		0		0
Goodwill	1,941.0					1,919.2					1,941.0		1,919.2		696.3
Gas Utility [Member]
Segment Reporting Information [Line Items]
Revenues											839.0		785.4		1,026.4
Cost of sales											407.2		402.5		610.6
Operating income											196.5		174.1		199.6
Loss from equity investees											0		0		0
Loss on extinguishments of debt													0		0
Interest expense											(37.4)		(40.1)		(40.4)
Income before income taxes											159.1		134.0		159.2
Net income attributable to UGI											94.3		81.6		99.3
Depreciation and amortization											51.7		49.0		48.4
Noncontrolling interests’ net income (loss)											0		0		0
Total assets	2,069.0					2,045.5					2,069.0		2,045.5		2,028.7
Bank loans	17.5					9.2					17.5		9.2		0
Capital expenditures											144.4		109.0		91.3
Investments in equity investees	0					0					0		0		0
Goodwill	182.1					182.1					182.1		182.1		182.1
Energy Services [Member]
Segment Reporting Information [Line Items]
Revenues											969.4		816.4		1,023.8
Cost of sales											836.9		701.9		904.5
Operating income											82.5		70.8		81.9
Loss from equity investees											0		0		0
Loss on extinguishments of debt													0		0
Interest expense											(3.2)		(4.8)		(2.0)
Income before income taxes											79.3		66.0		79.9
Net income attributable to UGI											46.3		38.7		47.1
Depreciation and amortization											7.6		3.7		2.4
Noncontrolling interests’ net income (loss)											0		0		0
Total assets	501.2					368.5					501.2		368.5		338.2
Bank loans	87.0					85.0					87.0		85.0		24.3
Capital expenditures											133.8		36.0		63.1
Investments in equity investees	0					0					0		0		0
Goodwill	2.8					2.8					2.8		2.8		2.8
Electric Generation [Member]
Segment Reporting Information [Line Items]
Revenues											71.4		43.9		48.6
Cost of sales											39.9		28.0		30.4
Operating income											7.5		(6.5)		(1.1)
Loss from equity investees											0		0		0
Loss on extinguishments of debt													0		0
Interest expense											0		0		(0.7)
Income before income taxes											7.5		(6.5)		(1.8)
Net income attributable to UGI											6.2		(1.0)		0.9
Depreciation and amortization											10.0		9.0		5.6
Noncontrolling interests’ net income (loss)											0		0		0
Total assets	269.7					258.2					269.7		258.2		242.5
Bank loans	0					0					0		0		0
Capital expenditures											22.6		24.4		49.7
Investments in equity investees	0					0					0		0		0
Goodwill	0					0					0		0		0
Antargaz [Member]
Segment Reporting Information [Line Items]
Revenues											1,322.6		1,121.4		1,050.6
Cost of sales											845.0		685.5		649.8
Operating income											111.4		88.3		89.2
Loss from equity investees											(0.4)		(0.3)		(0.9)
Loss on extinguishments of debt													0		0
Interest expense											(25.3)		(26.3)		(25.5)
Income before income taxes											85.7		61.7		62.8
Net income attributable to UGI											57.2		51.4		44.2
Depreciation and amortization											57.6		57.1		52.1
Noncontrolling interests’ net income (loss)											(0.2)		0.2		0.3
Total assets	1,784.4					1,686.5					1,784.4		1,686.5		1,636.6
Bank loans	0					0					0		0		0
Capital expenditures											53.4		47.3		48.9
Investments in equity investees	0					0					0		0		0
Goodwill	643.7					612.0					643.7		612.0		591.8
Flaga & Other [Member]
Segment Reporting Information [Line Items]
Revenues											856.6		824.7		438.1
Cost of sales											653.4		640.3		321.0
Operating income											35.6		23.6		(3.1)
Loss from equity investees											0		0		0
Loss on extinguishments of debt													0		0
Interest expense											(5.1)		(4.6)		(2.7)
Income before income taxes											30.5		19.0		(5.8)
Net income attributable to UGI											25.5		13.8		(3.2)
Depreciation and amortization											24.1		22.1		18.5
Noncontrolling interests’ net income (loss)											0.1		0		0
Total assets	667.1					531.8					667.1		531.8		428.8
Bank loans	6.5					21.0					6.5		21.0		18.9
Capital expenditures											17.4		16.9		16.5
Investments in equity investees	0.3					0.3					0.3		0.3		0.3
Goodwill	97.1					95.2					97.1		95.2		82.2
Corporate & Other [Member]
Segment Reporting Information [Line Items]
Revenues											190.7	[3]	186.8	[3]	198.2	[3]
Cost of sales											102.3	[3]	92.5	[3]	89.6	[3]
Operating income											4.3	[3]	19.6	[3]	34.3	[3]
Loss from equity investees											0	[3]	0		0
Loss on extinguishments of debt													0		0
Interest expense											(2.7)	[3]	(3.1)	[3]	(3.2)	[3]
Income before income taxes											1.6	[3]	16.5	[3]	31.1	[3]
Net income attributable to UGI											1.7	[3]	10.3	[3]	17.6	[3]
Depreciation and amortization											6.2	[3]	6.0	[3]	6.2	[3]
Noncontrolling interests’ net income (loss)											0		0		0	[3]
Total assets	388.4	[3]				356.7	[3]				388.4	[3]	356.7	[3]	281.4	[3]
Bank loans	0					0	[3]				0		0	[3]	0	[3]
Capital expenditures											7.5	[3]	6.5	[3]	8.9	[3]
Investments in equity investees	0					0	[3]				0		0	[3]	0
Goodwill	$ 7.0	[3]				$ 7.0	[3]				$ 7.0	[3]	$ 7.0	[3]	$ 7.0	[3]

[1] epresents the elimination of intersegment transactions principally among Midstream & Marketing, Gas Utility and AmeriGas Propane.

[2] The following table provides a reconciliation of Partnership EBITDA to AmeriGas Propane operating income:Year ended September 30, 2013 2012 2011Partnership EBITDA $596.5 $322.1 $295.6Depreciation and amortization (205.9) (168.1) (94.5)Loss on extinguishments of debt — 13.3 38.1Noncontrolling interests (i) 3.8 1.4 2.4Operating income $394.4 $168.7 $241.6(i)Principally represents the General Partner’s 1.01% interest in AmeriGas OLP.

[3] Corporate & Other results principally comprise (1) Electric Utility, (2) Enterprises’ heating, ventilation, air-conditioning, refrigeration and electrical contracting businesses (“HVAC”), (3) changes in the fair values of Midstream & Marketing’s unsettled commodity derivative instruments and gains and losses on settled commodity derivative instruments not associated with current period transactions, (4) net expenses of UGI’s captive general liability insurance company, and (5) UGI Corporation’s unallocated corporate and general expenses and interest income. Corporate & Other assets principally comprise cash, short-term investments, the assets of Electric Utility and HVAC, and an intercompany loan. The intercompany loan and associated interest is removed in the segment presentation.