Segment Information - Schedule of Segment Reporting (Details) (USD $)	3 Months Ended											12 Months Ended
	Sep. 30, 2014		Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2012
Segment Reporting Information
Revenues	$ 1,311,400,000		$ 1,486,700,000	$ 3,163,300,000	$ 2,315,900,000	[1]	$ 1,259,000,000	[2]	$ 1,374,300,000	$ 2,542,700,000	$ 2,018,700,000	$ 8,277,300,000		$ 7,194,700,000		$ 6,521,300,000
Cost of sales												5,175,700,000		4,324,400,000		4,099,100,000
Operating income (loss)	(9,400,000)		62,700,000	588,600,000	363,700,000	[1]	(12,300,000)	[2]	41,500,000	507,700,000	294,200,000	1,005,600,000		831,100,000		538,600,000
Loss from equity investees												(100,000)		(400,000)		(300,000)
Loss on extinguishments of debt												0		0		(13,300,000)
Interest expense												(237,700,000)		(240,300,000)		(220,400,000)
Income (loss) before income taxes												767,800,000		590,400,000		304,600,000
Net income (loss) attributable to UGI	(19,800,000)		20,600,000	214,400,000	122,000,000	[1]	(14,200,000)	[2]	9,100,000	180,700,000	102,500,000	337,200,000		278,100,000		210,200,000
Depreciation and amortization												362,900,000		363,100,000		315,000,000
Noncontrolling interests’ net income (loss)												195,400,000		149,500,000		(12,500,000)
Partnership EBITDA (a)												655,300,000	[3]
Total assets	10,093,000,000						10,008,800,000					10,093,000,000		10,008,800,000		9,676,900,000
Short-term borrowings	210,800,000						227,900,000					210,800,000		227,900,000		165,100,000
Property, Plant and Equipment, Additions												436,400,000		489,100,000		343,200,000
Investments in equity investees	600,000						300,000					600,000		300,000		300,000
Goodwill	2,833,400,000						2,873,700,000					2,833,400,000		2,873,700,000		2,818,300,000
Eliminations
Segment Reporting Information
Revenues												(321,300,000)	[4]	(223,800,000)	[4]	(178,800,000)	[4]
Cost of sales												(317,700,000)	[4]	(217,500,000)	[4]	(174,000,000)	[4]
Operating income (loss)												200,000		(1,100,000)		0
Loss from equity investees												0		0		0
Loss on extinguishments of debt																0
Interest expense												0		0		0
Income (loss) before income taxes												200,000		(1,100,000)		0
Net income (loss) attributable to UGI														(600,000)		0
Depreciation and amortization												0		0		0
Noncontrolling interests’ net income (loss)												0		0		0
Partnership EBITDA (a)													[3]
Total assets	(86,500,000)						(100,300,000)					(86,500,000)		(100,300,000)		(104,100,000)
Short-term borrowings	0						0					0		0		0
Property, Plant and Equipment, Additions														(1,100,000)		0
Investments in equity investees	0						0					0		0		0
Goodwill	0						0					0		0		0
AmeriGas Propane
Segment Reporting Information
Revenues												3,712,900,000		3,168,800,000		2,921,500,000
Cost of sales												2,107,100,000		1,657,200,000		1,722,400,000
Operating income (loss)												472,000,000		394,400,000		168,700,000
Loss from equity investees												0		0		0
Loss on extinguishments of debt												0		0		(13,300,000)
Interest expense												(165,600,000)		(166,600,000)		(141,500,000)
Income (loss) before income taxes												306,400,000		227,800,000		13,900,000
Net income (loss) attributable to UGI												63,000,000		47,500,000		15,400,000
Depreciation and amortization												197,200,000		205,900,000		168,100,000
Noncontrolling interests’ net income (loss)												195,800,000		149,600,000		(12,700,000)
Partnership EBITDA (a)												664,800,000	[3]	596,500,000	[3]	322,100,000	[3]
Total assets	4,377,000,000						4,429,300,000					4,377,000,000		4,429,300,000		4,533,800,000
Short-term borrowings	109,000,000						116,900,000					109,000,000		116,900,000		49,900,000
Property, Plant and Equipment, Additions												113,900,000		111,100,000		103,100,000
Investments in equity investees	0						0					0		0		0
Goodwill	1,945,100,000						1,941,000,000					1,945,100,000		1,941,000,000		1,919,200,000
Gas Utility
Segment Reporting Information
Revenues												977,300,000		839,000,000		785,400,000
Cost of sales												496,800,000		407,200,000		402,500,000
Operating income (loss)												236,200,000		196,500,000		174,100,000
Loss from equity investees												0		0		0
Loss on extinguishments of debt																0
Interest expense												(36,600,000)		(37,400,000)		(40,100,000)
Income (loss) before income taxes												199,600,000		159,100,000		134,000,000
Net income (loss) attributable to UGI												118,800,000		94,300,000		81,600,000
Depreciation and amortization												54,800,000		51,700,000		49,000,000
Noncontrolling interests’ net income (loss)												0		0		0
Partnership EBITDA (a)													[3]
Total assets	2,214,100,000						2,069,000,000					2,214,100,000		2,069,000,000		2,045,500,000
Short-term borrowings	86,300,000						17,500,000					86,300,000		17,500,000		9,200,000
Property, Plant and Equipment, Additions												156,400,000		144,400,000		109,000,000
Investments in equity investees	0						0					0		0		0
Goodwill	182,100,000						182,100,000					182,100,000		182,100,000		182,100,000
Energy Services
Segment Reporting Information
Revenues												1,305,500,000		969,400,000		816,400,000
Cost of sales												1,058,800,000		836,900,000		701,900,000
Operating income (loss)												180,500,000		82,500,000		70,800,000
Loss from equity investees												0		0		0
Loss on extinguishments of debt																0
Interest expense												(2,900,000)		(3,200,000)		(4,800,000)
Income (loss) before income taxes												177,600,000		79,300,000		66,000,000
Net income (loss) attributable to UGI												105,200,000		46,300,000		38,700,000
Depreciation and amortization												12,300,000		7,600,000		3,700,000
Noncontrolling interests’ net income (loss)												0		0		0
Partnership EBITDA (a)													[3]
Total assets	569,000,000						501,200,000					569,000,000		501,200,000		368,500,000
Short-term borrowings	7,500,000						87,000,000					7,500,000		87,000,000		85,000,000
Property, Plant and Equipment, Additions												67,800,000		133,800,000		36,000,000
Investments in equity investees	0						0					0		0		0
Goodwill	5,600,000						2,800,000					5,600,000		2,800,000		2,800,000
Electric Generation
Segment Reporting Information
Revenues												85,100,000		71,400,000		43,900,000
Cost of sales												39,600,000		39,900,000		28,000,000
Operating income (loss)												18,100,000		7,500,000		(6,500,000)
Loss from equity investees												0		0		0
Loss on extinguishments of debt																0
Interest expense												0		0		0
Income (loss) before income taxes												18,100,000		7,500,000		(6,500,000)
Net income (loss) attributable to UGI												12,600,000		6,200,000		(1,000,000)
Depreciation and amortization												10,700,000		10,000,000		9,000,000
Noncontrolling interests’ net income (loss)												0		0		0
Partnership EBITDA (a)													[3]
Total assets	277,700,000						269,700,000					277,700,000		269,700,000		258,200,000
Short-term borrowings	0						0					0		0		0
Property, Plant and Equipment, Additions												15,600,000		22,600,000		24,400,000
Investments in equity investees	0						0					0		0		0
Goodwill	0						0					0		0		0
Antargaz
Segment Reporting Information
Revenues												1,295,500,000		1,322,600,000		1,121,400,000
Cost of sales												848,100,000		845,000,000		685,500,000
Operating income (loss)												79,100,000		111,400,000		88,300,000
Loss from equity investees												(100,000)		(400,000)		(300,000)
Loss on extinguishments of debt																0
Interest expense												(25,100,000)		(25,300,000)		(26,300,000)
Income (loss) before income taxes												53,900,000		85,700,000		61,700,000
Net income (loss) attributable to UGI												20,600,000		57,200,000		51,400,000
Depreciation and amortization												54,500,000		57,600,000		57,100,000
Noncontrolling interests’ net income (loss)												(400,000)		(200,000)		200,000
Partnership EBITDA (a)													[3]
Total assets	1,659,100,000						1,784,400,000					1,659,100,000		1,784,400,000		1,686,500,000
Short-term borrowings	0						0					0		0		0
Property, Plant and Equipment, Additions												50,200,000		53,400,000		47,300,000
Investments in equity investees	0						0					0		0		0
Goodwill	601,200,000						643,700,000					601,200,000		643,700,000		612,000,000
Flaga & Other
Segment Reporting Information
Revenues												1,026,900,000		856,600,000		824,700,000
Cost of sales												809,900,000		653,400,000		640,300,000
Operating income (loss)												38,400,000		35,600,000		23,600,000
Loss from equity investees												0		0		0
Loss on extinguishments of debt																0
Interest expense												(4,900,000)		(5,100,000)		(4,600,000)
Income (loss) before income taxes												33,500,000		30,500,000		19,000,000
Net income (loss) attributable to UGI												27,700,000		25,500,000		13,800,000
Depreciation and amortization												27,100,000		24,100,000		22,100,000
Noncontrolling interests’ net income (loss)												0		100,000		0
Partnership EBITDA (a)													[3]
Total assets	643,600,000						667,100,000					643,600,000		667,100,000		531,800,000
Short-term borrowings	8,000,000						6,500,000					8,000,000		6,500,000		21,000,000
Property, Plant and Equipment, Additions												23,000,000		17,400,000		16,900,000
Investments in equity investees	600,000						300,000					600,000		300,000		300,000
Goodwill	92,400,000						97,100,000					92,400,000		97,100,000		95,200,000
Corporate & Other
Segment Reporting Information
Revenues												195,400,000	[5]	190,700,000	[5]	186,800,000	[5]
Cost of sales												133,100,000	[5]	102,300,000	[5]	92,500,000	[5]
Operating income (loss)												(18,900,000)	[5]	4,300,000	[5]	19,600,000	[5]
Loss from equity investees												0	[5]	0	[5]	0
Loss on extinguishments of debt																0
Interest expense												(2,600,000)	[5]	(2,700,000)	[5]	(3,100,000)	[5]
Income (loss) before income taxes												(21,500,000)	[5]	1,600,000	[5]	16,500,000	[5]
Net income (loss) attributable to UGI												(10,700,000)	[5]	1,700,000	[5]	10,300,000	[5]
Depreciation and amortization												6,300,000	[5]	6,200,000	[5]	6,000,000	[5]
Noncontrolling interests’ net income (loss)												0	[5]	0	[5]	0	[5]
Partnership EBITDA (a)												(9,500,000)	[3],[5]
Total assets	439,000,000	[5]					388,400,000	[5]				439,000,000	[5]	388,400,000	[5]	356,700,000	[5]
Short-term borrowings	0	[5]					0	[5]				0	[5]	0	[5]	0	[5]
Property, Plant and Equipment, Additions												9,500,000	[5]	7,500,000	[5]	6,500,000	[5]
Investments in equity investees	0	[5]					0	[5]				0	[5]	0	[5]	0
Goodwill	$ 7,000,000	[5]					$ 7,000,000	[5]				$ 7,000,000	[5]	$ 7,000,000	[5]	$ 7,000,000	[5]

[1] 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).

[2] Includes impairment loss on private equity partnership investment which increased operating loss by $6.3 and net loss attributable to UGI Corporation by $3.7 or $0.02 per share (see Note 2).

[3] The following table provides a reconciliation of Partnership EBITDA to AmeriGas Propane operating income: 2014 2013 2012Partnership EBITDA $664.8 $596.5 $322.1Depreciation and amortization (197.2) (205.9) (168.1)Loss on extinguishments of debt — — 13.3Noncontrolling interests (i) 4.4 3.8 1.4Operating income $472.0 $394.4 $168.7(i)Principally represents the General Partner’s 1.01% interest in AmeriGas OLP.

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

[5] Corporate & Other results principally comprise (1) Electric Utility, (2) Enterprises’ heating, ventilation, air-conditioning, refrigeration and electrical contracting businesses (“HVAC”), (3) net expenses of UGI’s captive general liability insurance company, (4) UGI Corporation’s unallocated corporate and general expenses and interest income and (5) net (losses) gains on Midstream & Marketing’s unsettled commodity derivative instruments and certain settled commodity derivative instruments not associated with current period transactions, and net (losses) gains on AmeriGas Propane’s unsettled commodity derivative instruments entered into beginning April 1, 2014, totaling $(18.0), $7.4 and $15.1 in Fiscal 2014, Fiscal 2013 and Fiscal 2012, respectively. 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.