Segment Information - Schedule of Segment Reporting Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Sep. 30, 2014
Segment Reporting Information
Revenues	$ 2,004.6		$ 2,315.9
Cost of sales	1,404.6		1,429.9
Segment profit:
Operating income (loss)	83.3		363.7
Loss from equity investees	(1.0)		0
Interest expense	(59.0)		(59.3)
Income (loss) before income taxes	23.3		304.4
Noncontrolling interests’ net income (loss)	(33.9)		95.5
Depreciation and amortization	(91.0)		(94.0)
Capital expenditures	123.5		102.8
Total assets	10,430.0		10,663.5		10,093.0
Short-term borrowings	458.5		421.5		210.8
Goodwill	2,806.8		2,884.5		2,833.4
General Partnership interest in AmeriGas OLP (percentage)	1.01%		1.01%
Gains (losses) on unsettled commodity derivative instruments, net	(229.7)		(7.2)
Eliminations
Segment Reporting Information
Revenues	(67.7)	[1]	(65.5)	[1]
Cost of sales	(67.0)	[1]	(64.4)	[1]
Segment profit:
Operating income (loss)	0		(0.1)
Loss from equity investees	0		0
Interest expense	0		0
Income (loss) before income taxes	0		(0.1)
Noncontrolling interests’ net income (loss)	0		0
Depreciation and amortization	0		0
Capital expenditures	0		(1.2)
Total assets	(92.7)		(101.1)
Short-term borrowings	0		0
Goodwill	0		0
AmeriGas Propane
Segment Reporting Information
Revenues	888.8		1,045.8
Cost of sales	462.4		582.7
Segment profit:
Operating income (loss)	139.7		179.7
Loss from equity investees	0		0
Interest expense	(41.0)		(41.6)
Income (loss) before income taxes	98.7		138.1
Partnership Adjusted EBITDA	188.5	[2]	230.2	[2]
Noncontrolling interests’ net income (loss)	66.8		95.4
Depreciation and amortization	(49.4)		(52.3)
Capital expenditures	30.4		23.3
Total assets	4,491.0		4,682.3
Short-term borrowings	253.0		208.8
Goodwill	1,949.6		1,938.8
Noncontrolling interests	0.6	[3]	1.8	[3]
Gas Utility
Segment Reporting Information
Revenues	260.5		271.6
Cost of sales	127.2		135.5
Segment profit:
Operating income (loss)	71.8		82.1
Loss from equity investees	0		0
Interest expense	(10.1)		(8.4)
Income (loss) before income taxes	61.7		73.7
Noncontrolling interests’ net income (loss)	0		0
Depreciation and amortization	(14.3)		(13.4)
Capital expenditures	53.5		32.9
Total assets	2,346.2		2,188.6
Short-term borrowings	153.5		73.5
Goodwill	182.1		182.1
Midstream & Marketing, Energy Services
Segment Reporting Information
Revenues	297.0		272.7
Cost of sales	234.4		227.1
Segment profit:
Operating income (loss)	46.2		31.8
Loss from equity investees	0		0
Interest expense	(0.6)		(1.0)
Income (loss) before income taxes	45.6		30.8
Noncontrolling interests’ net income (loss)	0		0
Depreciation and amortization	(3.6)		(2.6)
Capital expenditures	12.8		21.7
Total assets	699.9		574.8
Short-term borrowings	43.0		124.5
Goodwill	5.6		2.8
Midstream & Marketing, Electric Generation
Segment Reporting Information
Revenues	16.5		20.8
Cost of sales	8.0		10.6
Segment profit:
Operating income (loss)	(0.7)		4.4
Loss from equity investees	0		0
Interest expense	0		0
Income (loss) before income taxes	(0.7)		4.4
Noncontrolling interests’ net income (loss)	0		0
Depreciation and amortization	(2.7)		(2.6)
Capital expenditures	6.6		9.3
Total assets	286.4		279.3
Short-term borrowings	0		0
Goodwill	0		0
UGI International, Antargaz
Segment Reporting Information
Revenues	337.9		425.3
Cost of sales	209.3		282.5
Segment profit:
Operating income (loss)	38.4		43.2
Loss from equity investees	(1.0)		0
Interest expense	(5.6)		(6.4)
Income (loss) before income taxes	31.8		36.8
Noncontrolling interests’ net income (loss)	0.1		0.1
Depreciation and amortization	(13.3)		(15.0)
Capital expenditures	12.1		9.8
Total assets	1,671.5		1,938.9
Short-term borrowings	0		0
Goodwill	575.9		654.3
UGI International, Flaga & Other
Segment Reporting Information
Revenues	224.6		293.3
Cost of sales	172.6		231.7
Segment profit:
Operating income (loss)	15.1		13.7
Loss from equity investees	0		0
Interest expense	(1.0)		(1.3)
Income (loss) before income taxes	14.1		12.4
Noncontrolling interests’ net income (loss)	0		0
Depreciation and amortization	(6.1)		(6.6)
Capital expenditures	6.4		4.6
Total assets	579.0		696.5
Short-term borrowings	9.0		14.7
Goodwill	87.4		99.5
Corporate & Other
Segment Reporting Information
Revenues	47.0	[4]	51.9	[4]
Cost of sales	257.7	[4]	24.2	[4]
Segment profit:
Operating income (loss)	(227.2)	[4]	8.9	[4]
Loss from equity investees	0	[4]	0	[4]
Interest expense	(0.7)	[4]	(0.6)	[4]
Income (loss) before income taxes	(227.9)	[4]	8.3	[4]
Noncontrolling interests’ net income (loss)	(100.8)	[4]	0	[4]
Depreciation and amortization	(1.6)	[4]	(1.5)	[4]
Capital expenditures	1.7	[4]	2.4	[4]
Total assets	448.7	[4]	404.2	[4]
Short-term borrowings	0	[4]	0	[4]
Goodwill	$ 6.2	[4]	$ 7.0	[4]

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

[2] The following table provides a reconciliation of Partnership Adjusted EBITDA to AmeriGas Propane operating income:Three Months Ended December 31, 2014 2013Partnership Adjusted EBITDA $188.5 $230.2Depreciation and amortization (49.4) (52.3)Noncontrolling interests (i) 0.6 1.8Operating income $139.7 $179.7(i)Principally represents the General Partner’s 1.01% interest in AmeriGas OLP.

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

[4] 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 net gains and (losses) on commodity derivative instruments not associated with current-period transactions totaling $(229.7) and $(7.2) during the three months ended December 31, 2014 and 2013, respectively. Corporate & Other assets principally comprise cash, short-term investments, the assets of Electric Utility and HVAC, and, in the three months ended December 31, 2013, an intercompany loan. The intercompany loan and associated interest is removed in the segment presentation.