Segment Information - Schedule of Segment Reporting (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
Segment Reporting Information
Revenues		$ 1,082.8		$ 1,148.1		$ 2,455.6	$ 2,004.6	$ 1,311.4		$ 1,486.7	$ 3,163.3	$ 2,315.9		$ 6,691.1		$ 8,277.3		$ 7,194.7
Cost of sales														3,736.5		5,175.7		4,324.4
Operating income (loss)		(6.6)		56.1		702.1	83.3	(9.4)		62.7	588.6	363.7		834.9		1,005.6		831.1
Loss from equity investees														(1.2)		(0.1)		(0.4)
Interest expense														(241.9)		(237.7)		(240.3)
Income (loss) before income taxes														591.8		767.8		590.4
Net income (loss) attributable to UGI		(9.2)		$ 9.6		$ 246.5	$ 34.1	(19.8)		$ 20.6	$ 214.4	$ 122.0		281.0		337.2		278.1
Depreciation and amortization														374.1		362.9		363.1
Noncontrolling interests’ net income (loss)														133.0		195.4		149.5
Total assets		10,546.6						10,093.0						10,546.6		10,093.0		10,008.8
Short-term borrowings		189.9						210.8						189.9		210.8		227.9
Capital expenditures														475.4		436.4		488.0
Investments in equity investees		16.2						0.6						16.2		0.6		0.3
Goodwill		2,953.4						2,833.4						2,953.4		2,833.4		2,873.7
Pretax gains (losses) on unsettled commodity derivative instruments														(119.1)		(18.0)		7.4
Pretax loss on early extinguishment of debt														10.3
AmeriGas Propane
Segment Reporting Information
Operating income (loss)														427.6		472.0		394.4
Depreciation and amortization														194.9		197.2		205.9
Partnership Adjusted EBITDA														619.2		664.8		596.5
Eliminations
Segment Reporting Information
Revenues	[3]													(232.6)		(321.3)		(223.8)
Cost of sales	[3]													(228.8)		(317.7)		(217.5)
Operating income (loss)														(0.9)		0.2		(1.1)
Loss from equity investees														0.0		0.0		0.0
Interest expense														0.0		0.0		0.0
Income (loss) before income taxes														(0.9)		0.2		(1.1)
Net income (loss) attributable to UGI														(0.6)		0.0		(0.6)
Depreciation and amortization														0.0		0.0		0.0
Noncontrolling interests’ net income (loss)														0.0		0.0		0.0
Total assets		(90.4)						(86.5)						(90.4)		(86.5)		(100.3)
Short-term borrowings		0.0						0.0						0.0		0.0		0.0
Capital expenditures																0.0		(1.1)
Investments in equity investees		0.0						0.0						0.0		0.0		0.0
Goodwill		0.0						0.0						0.0		0.0		0.0
Operating Segments | AmeriGas Propane
Segment Reporting Information
Revenues														2,885.3		3,712.9		3,168.8
Cost of sales														1,340.0		2,107.1		1,657.2
Operating income (loss)														427.6		472.0		394.4
Loss from equity investees														0.0		0.0		0.0
Interest expense														(162.8)		(165.6)		(166.6)
Income (loss) before income taxes														264.8		306.4		227.8
Net income (loss) attributable to UGI														61.0		63.0		47.5
Depreciation and amortization														194.9		197.2		205.9
Noncontrolling interests’ net income (loss)														167.9		195.8		149.6
Partnership Adjusted EBITDA	[4]													619.2		664.8		596.5
Total assets		4,150.0						4,377.0						4,150.0		4,377.0		4,429.3
Short-term borrowings		68.1						109.0						68.1		109.0		116.9
Capital expenditures														102.0		113.9		111.1
Investments in equity investees		0.0						0.0						0.0		0.0		0.0
Goodwill		1,956.0						1,945.1						1,956.0		1,945.1		1,941.0
Operating Segments | Gas Utility
Segment Reporting Information
Revenues														933.1		977.3		839.0
Cost of sales														448.6		496.8		407.2
Operating income (loss)														226.5		236.2		196.5
Loss from equity investees														0.0		0.0		0.0
Interest expense														(39.1)		(36.6)		(37.4)
Income (loss) before income taxes														187.4		199.6		159.1
Net income (loss) attributable to UGI														115.8		118.8		94.3
Depreciation and amortization														59.0		54.8		51.7
Noncontrolling interests’ net income (loss)														0.0		0.0		0.0
Total assets		2,362.4						2,214.1						2,362.4		2,214.1		2,069.0
Short-term borrowings		71.7						86.3						71.7		86.3		17.5
Capital expenditures														189.7		156.4		144.4
Investments in equity investees		0.0						0.0						0.0		0.0		0.0
Goodwill		182.1						182.1						182.1		182.1		182.1
Operating Segments | Energy Services
Segment Reporting Information
Revenues														1,041.8		1,305.5		969.4
Cost of sales														800.9		1,058.8		836.9
Operating income (loss)														171.8		180.5		82.5
Loss from equity investees														0.0		0.0		0.0
Interest expense														(2.1)		(2.9)		(3.2)
Income (loss) before income taxes														169.7		177.6		79.3
Net income (loss) attributable to UGI														99.3		105.2		46.3
Depreciation and amortization														14.6		12.3		7.6
Noncontrolling interests’ net income (loss)														0.0		0.0		0.0
Total assets		664.3						569.0						664.3		569.0		501.2
Short-term borrowings		49.5						7.5						49.5		7.5		87.0
Capital expenditures														71.5		67.8		133.8
Investments in equity investees		6.4						0.0						6.4		0.0		0.0
Goodwill		5.6						5.6						5.6		5.6		2.8
Operating Segments | Electric Generation
Segment Reporting Information
Revenues														75.9		85.1		71.4
Cost of sales														32.2		39.6		39.9
Operating income (loss)														13.0		18.1		7.5
Loss from equity investees														0.0		0.0		0.0
Interest expense														0.0		0.0		0.0
Income (loss) before income taxes														13.0		18.1		7.5
Net income (loss) attributable to UGI														9.6		12.6		6.2
Depreciation and amortization														12.5		10.7		10.0
Noncontrolling interests’ net income (loss)														0.0		0.0		0.0
Total assets		282.0						277.7						282.0		277.7		269.7
Short-term borrowings		0.0						0.0						0.0		0.0		0.0
Capital expenditures														16.7		15.6		22.6
Investments in equity investees		0.0						0.0						0.0		0.0		0.0
Goodwill		0.0						0.0						0.0		0.0		0.0
Operating Segments | UGI France
Segment Reporting Information
Revenues														1,122.2		1,295.5		1,322.6
Cost of sales														628.0		848.1		845.0
Operating income (loss)														75.9		79.1		111.4
Loss from equity investees														(1.2)		(0.1)		(0.4)
Interest expense														(31.6)	[5]	(25.1)		(25.3)
Income (loss) before income taxes														43.1		53.9		85.7
Net income (loss) attributable to UGI														27.5		20.6		57.2
Depreciation and amortization														63.7		54.5		57.6
Noncontrolling interests’ net income (loss)																(0.4)		(0.2)
Total assets		2,340.4						1,659.1						2,340.4		1,659.1		1,784.4
Short-term borrowings		0.1						0.0						0.1		0.0		0.0
Capital expenditures														65.0		50.2		53.4
Investments in equity investees		6.0						0.0						6.0		0.0		0.0
Goodwill		721.4						601.2						721.4		601.2		643.7
Operating Segments | Flaga & Other
Segment Reporting Information
Revenues														686.3		1,026.9		856.6
Cost of sales														492.0		809.9		653.4
Operating income (loss)														36.9		38.4		35.6
Loss from equity investees														0.0		0.0		0.0
Interest expense														(3.6)		(4.9)		(5.1)
Income (loss) before income taxes														33.3		33.5		30.5
Net income (loss) attributable to UGI														25.2		27.7		25.5
Depreciation and amortization														23.2		27.1		24.1
Noncontrolling interests’ net income (loss)														(0.1)		0.0		0.1
Total assets		529.1						643.6						529.1		643.6		667.1
Short-term borrowings		0.5						8.0						0.5		8.0		6.5
Capital expenditures														22.5		23.0		17.4
Investments in equity investees		3.8						0.6						3.8		0.6		0.3
Goodwill		82.3						92.4						82.3		92.4		97.1
Corporate & Other
Segment Reporting Information
Revenues	[6]													179.1		195.4		190.7
Cost of sales	[6]													223.6		133.1		102.3
Operating income (loss)	[6]													(115.9)		(18.9)		4.3
Loss from equity investees														0.0	[6]	0.0	[6]	0.0
Interest expense	[6]													(2.7)		(2.6)		(2.7)
Income (loss) before income taxes	[6]													(118.6)		(21.5)		1.6
Net income (loss) attributable to UGI	[6]													(56.8)		(10.7)		1.7
Depreciation and amortization	[6]													6.2		6.3		6.2
Noncontrolling interests’ net income (loss)	[6]													(34.8)		0.0		0.0
Total assets	[6]	308.8						439.0						308.8		439.0		388.4
Short-term borrowings	[6]	0.0						0.0						0.0		0.0		0.0
Capital expenditures	[6]													8.0		9.5		6.4
Investments in equity investees		0.0	[6]					0.0	[6]					0.0	[6]	0.0	[6]	0.0
Goodwill	[6]	$ 6.0						$ 7.0						$ 6.0		$ 7.0		$ 7.0

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

[4] The following table provides a reconciliation of Partnership Adjusted EBITDA to AmeriGas Propane operating income: 2015 2014 2013Partnership Adjusted EBITDA $619.2 $664.8 $596.5Depreciation and amortization (194.9) (197.2) (205.9)Noncontrolling interests (i) 3.3 4.4 3.8Operating income $427.6 $472.0 $394.4(i)Principally represents the General Partner’s 1.01% interest in AmeriGas OLP.

[5] Includes pre-tax loss of $10.3 associated with an early extinguishment of debt (see Note 6).

[6] 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, and (4) UGI Corporation’s unallocated corporate and general expenses and interest income. In addition, Corporate & Other results also include the effects of net pre-tax gains and (losses) on commodity derivative instruments not associated with current-period transactions totaling $(119.1), $(18.0) and $7.4 in Fiscal 2015, Fiscal 2014 and Fiscal 2013, respectively. Corporate & Other assets principally comprise cash, short-term investments, the assets of Electric Utility and HVAC. Through March 2014, Corporate & Other also had an intercompany loan. The intercompany loan interest is removed in the segment presentation.