Segment Information - Schedule of Segment Reporting Information (Details) - USD ($) $ in Millions		3 Months Ended			9 Months Ended
		Jun. 30, 2016	Jun. 30, 2015		Jun. 30, 2016	Jun. 30, 2015		Sep. 30, 2015
Segment Reporting Information
Revenues		$ 1,130.8	$ 1,148.1	[1]	$ 4,709.5	$ 5,608.3	[1]
Cost of sales		433.0	586.4	[1]	1,943.9	3,196.4	[1]
Segment profit:
Operating income (loss)		155.7	56.1	[1]	1,076.6	841.5	[1]
Loss from equity investees		0.0	0.0		(0.1)	(1.1)	[1]
Loss on extinguishments of debt		(37.1)	0.0		(37.1)	0.0
Interest expense		(56.4)	(67.5)	[1]	(171.6)	(184.7)	[1]
Income (loss) before income taxes		62.2	(11.4)	[1]	867.8	655.7	[1]
Noncontrolling interests’ net (loss) income		(32.1)	(25.5)	[1]	196.0	176.3	[1]
Depreciation and amortization		98.1	92.5	[1]	299.4	271.5	[1]
Capital expenditures (including the effects of accruals)		137.4	113.2	[1]	384.8	328.1	[1]
Total assets		11,144.2	10,520.0	[1]	11,144.2	10,520.0	[1]	$ 10,546.6
Short-term borrowings		144.0	68.0	[1]	144.0	68.0	[1]	189.9
Goodwill		2,981.3	2,927.7	[1]	2,981.3	2,927.7	[1]	$ 2,953.4
AmeriGas Propane
Segment profit:
Loss on extinguishments of debt		(37.1)	0.0		(37.1)	0.0
Interest expense		(40.9)	(40.3)		(122.7)	(122.4)
Income (loss) before income taxes		(59.7)	(39.5)		238.5	315.0
Partnership Adjusted EBITDA		64.6	48.9		537.7	579.5
Depreciation and amortization		46.4	48.0		143.0	145.5
UGI International, UGI France | Term Loan
Segment profit:
Pre-tax loss associated with early extinguishment of debt			10.3			10.3
Eliminations
Segment Reporting Information
Revenues	[2]	(20.0)	(27.0)	[1]	(124.6)	(209.4)	[1]
Cost of sales	[2]	(19.2)	(26.4)	[1]	(122.2)	(207.4)	[1]
Segment profit:
Operating income (loss)		0.1	0.0	[1]	0.2	0.1	[1]
Loss from equity investees					0.0	0.0	[1]
Loss on extinguishments of debt		0.0			0.0
Interest expense		0.0	0.0	[1]	0.0	0.0	[1]
Income (loss) before income taxes		0.1	0.0	[1]	0.2	0.1	[1]
Noncontrolling interests’ net (loss) income		0.0	0.0	[1]	0.0	0.0	[1]
Depreciation and amortization		(0.1)	0.0	[1]	(0.2)	0.0	[1]
Capital expenditures (including the effects of accruals)		0.0	0.0	[1]	0.0	0.0	[1]
Total assets		(82.6)	(121.8)	[1]	(82.6)	(121.8)	[1]
Short-term borrowings		0.0	0.0	[1]	0.0	0.0	[1]
Goodwill		0.0	0.0	[1]	0.0	0.0	[1]
Operating Segments | AmeriGas Propane
Segment Reporting Information
Revenues		446.7	478.0	[1]	1,918.3	2,467.1	[1]
Cost of sales		170.8	211.4	[1]	712.2	1,179.0	[1]
Segment profit:
Operating income (loss)		18.3	0.8	[1]	398.3	437.4	[1]
Loss from equity investees					0.0	0.0	[1]
Loss on extinguishments of debt		(37.1)			(37.1)
Interest expense		(40.9)	(40.3)	[1]	(122.7)	(122.4)	[1]
Income (loss) before income taxes		(59.7)	(39.5)	[1]	238.5	315.0	[1]
Partnership Adjusted EBITDA	[3]	64.6	48.9	[1]	537.7	579.5	[1]
Noncontrolling interests’ net (loss) income		(52.4)	(36.1)	[1]	150.9	211.6	[1]
Depreciation and amortization		46.4	48.0	[1]	143.0	145.5	[1]
Capital expenditures (including the effects of accruals)		18.7	20.7	[1]	74.5	77.9	[1]
Total assets		4,406.6	4,202.6	[1]	4,406.6	4,202.6	[1]
Short-term borrowings		11.4	43.6	[1]	11.4	43.6	[1]
Goodwill		1,978.2	1,954.1	[1]	1,978.2	1,954.1	[1]
Operating Segments | UGI Utilities
Segment Reporting Information
Revenues		140.3	143.5	[1]	660.3	931.4	[1]
Cost of sales		44.4	53.7	[1]	257.3	475.1	[1]
Segment profit:
Operating income (loss)		29.8	20.2	[1]	192.6	238.5	[1]
Loss from equity investees					0.0	0.0	[1]
Loss on extinguishments of debt		0.0			0.0
Interest expense		(9.1)	(9.9)	[1]	(27.9)	(31.2)	[1]
Income (loss) before income taxes		20.7	10.3	[1]	164.7	207.3	[1]
Noncontrolling interests’ net (loss) income		0.0	0.0	[1]	0.0	0.0	[1]
Depreciation and amortization		16.6	15.9	[1]	50.3	47.0	[1]
Capital expenditures (including the effects of accruals)		56.5	43.3	[1]	166.1	139.6	[1]
Total assets		2,699.9	2,423.2	[1]	2,699.9	2,423.2	[1]
Short-term borrowings		130.0	2.7	[1]	130.0	2.7	[1]
Goodwill		182.1	182.1	[1]	182.1	182.1	[1]
Operating Segments | Midstream & Marketing, Energy Services
Segment Reporting Information
Revenues		156.8	189.5	[1]	657.3	927.7	[1]
Cost of sales		121.7	148.2	[1]	459.0	698.3	[1]
Segment profit:
Operating income (loss)		12.6	18.2	[1]	130.0	155.6	[1]
Loss from equity investees					0.0	0.0	[1]
Loss on extinguishments of debt		0.0			0.0
Interest expense		(0.4)	(0.5)	[1]	(1.7)	(1.6)	[1]
Income (loss) before income taxes		12.2	17.7	[1]	128.3	154.0	[1]
Noncontrolling interests’ net (loss) income		0.0	0.0	[1]	0.0	0.0	[1]
Depreciation and amortization		4.2	3.9	[1]	12.6	11.6	[1]
Capital expenditures (including the effects of accruals)		34.5	27.6	[1]	71.6	46.6	[1]
Total assets		720.9	660.6	[1]	720.9	660.6	[1]
Short-term borrowings		0.0	20.0	[1]	0.0	20.0	[1]
Goodwill		11.5	11.9	[1]	11.5	11.9	[1]
Operating Segments | Midstream & Marketing, Electric Generation
Segment Reporting Information
Revenues		11.7	16.2	[1]	42.3	57.5	[1]
Cost of sales		4.9	7.7	[1]	17.2	25.1	[1]
Segment profit:
Operating income (loss)		(1.3)	1.3	[1]	2.0	8.6	[1]
Loss from equity investees					0.0	0.0	[1]
Loss on extinguishments of debt		0.0			0.0
Interest expense		0.0	0.0	[1]	0.0	0.0	[1]
Income (loss) before income taxes		(1.3)	1.3	[1]	2.0	8.6	[1]
Noncontrolling interests’ net (loss) income		0.0	0.0	[1]	0.0	0.0	[1]
Depreciation and amortization		3.4	3.2	[1]	10.1	9.2	[1]
Capital expenditures (including the effects of accruals)		1.8	1.1	[1]	3.4	10.0	[1]
Total assets		277.1	277.6	[1]	277.1	277.6	[1]
Short-term borrowings		0.0	0.0	[1]	0.0	0.0	[1]
Goodwill		0.0	0.0	[1]	0.0	0.0	[1]
Operating Segments | UGI International, UGI France
Segment Reporting Information
Revenues		280.7	196.1	[1]	1,136.1	881.2	[1]
Cost of sales		117.9	107.9	[1]	507.7	517.5	[1]
Segment profit:
Operating income (loss)		24.7	(9.1)	[1]	188.0	82.5	[1]
Loss from equity investees					(0.1)	(1.1)	[1]
Loss on extinguishments of debt		0.0			0.0
Interest expense		(4.9)	(15.7)	[1],[4]	(16.1)	(26.2)	[1],[4]
Income (loss) before income taxes		19.8	(24.8)	[1]	171.8	55.2	[1]
Noncontrolling interests’ net (loss) income		(0.1)	(0.2)	[1]	0.1	0.2	[1]
Depreciation and amortization		21.6	15.2	[1]	66.5	40.3	[1]
Capital expenditures (including the effects of accruals)		19.6	17.2	[1]	53.2	38.9	[1]
Total assets		2,386.8	2,377.9	[1]	2,386.8	2,377.9	[1]
Short-term borrowings		0.7	0.0	[1]	0.7	0.0	[1]
Goodwill		714.4	699.8	[1]	714.4	699.8	[1]
Operating Segments | UGI International, Flaga & Other
Segment Reporting Information
Revenues		114.8	150.7	[1]	416.3	548.2	[1]
Cost of sales		61.8	101.8	[1]	245.8	397.7	[1]
Segment profit:
Operating income (loss)		8.8	8.8	[1]	42.1	35.4	[1]
Loss from equity investees					0.0	0.0	[1]
Loss on extinguishments of debt		0.0			0.0
Interest expense		(0.9)	(0.9)	[1]	(2.7)	(2.8)	[1]
Income (loss) before income taxes		7.9	7.9	[1]	39.4	32.6	[1]
Noncontrolling interests’ net (loss) income		0.0	0.0	[1]	0.0	0.0	[1]
Depreciation and amortization		5.8	5.9	[1]	16.4	17.2	[1]
Capital expenditures (including the effects of accruals)		6.3	3.3	[1]	16.0	15.1	[1]
Total assets		519.8	534.5	[1]	519.8	534.5	[1]
Short-term borrowings		1.9	1.7	[1]	1.9	1.7	[1]
Goodwill		95.1	79.8	[1]	95.1	79.8	[1]
Corporate & Other
Segment Reporting Information
Revenues	[5]	(0.2)	1.1	[1]	3.5	4.6	[1]
Cost of sales	[5]	(69.3)	(17.9)	[1]	(133.1)	111.1	[1]
Segment profit:
Operating income (loss)	[5]	62.7	15.9	[1]	123.4	(116.6)	[1]
Loss from equity investees	[5]				0.0	0.0	[1]
Loss on extinguishments of debt	[5]	0.0			0.0
Interest expense	[5]	(0.2)	(0.2)	[1]	(0.5)	(0.5)	[1]
Income (loss) before income taxes	[5]	62.5	15.7	[1]	122.9	(117.1)	[1]
Noncontrolling interests’ net (loss) income	[5]	20.4	10.8	[1]	45.0	(35.5)	[1]
Depreciation and amortization	[5]	0.2	0.4	[1]	0.7	0.7	[1]
Capital expenditures (including the effects of accruals)	[5]	0.0	0.0	[1]	0.0	0.0	[1]
Total assets	[5]	215.7	165.4	[1]	215.7	165.4	[1]
Short-term borrowings	[5]	0.0	0.0	[1]	0.0	0.0	[1]
Goodwill	[5]	0.0	0.0	[1]	0.0	0.0	[1]
Gains (losses) on unsettled commodity derivative instruments, net		$ 67.9	$ 18.1		$ 133.0	$ (109.5)

[1] Certain amounts have been restated to reflect the current-year changes in our segment presentation as described above.

[2] Represents the elimination of intersegment transactions principally among Midstream & Marketing, UGI Utilities and AmeriGas Propane.

[3] The following table provides a reconciliation of Partnership Adjusted EBITDA to AmeriGas Propane (loss) income before income taxes: Three Months EndedJune 30, Nine Months EndedJune 30, 2016 2015 2016 2015Partnership Adjusted EBITDA $64.6 $48.9 $537.7 $579.5Depreciation and amortization (46.4) (48.0) (143.0) (145.5)Interest expense (40.9) (40.3) (122.7) (122.4)Loss on extinguishments of debt (37.1) — (37.1) —Noncontrolling interests (i) 0.1 (0.1) 3.6 3.4(Loss) income before income taxes $(59.7) $(39.5) $238.5 $315.0(i)Principally represents the General Partner’s 1.01% interest in AmeriGas OLP.

[4] UGI France interest expense includes pre-tax loss of $10.3 associated with an early extinguishment of debt (see Note 8).

[5] Corporate & Other results principally comprise (1) net expenses of UGI’s captive general liability insurance company, and (2) 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 $67.9 and $18.1 during the three months ended June 30, 2016 and 2015, respectively, and $133.0 and $(109.5) during the nine months ended June 30, 2016 and 2015, respectively. Corporate & Other assets principally comprise cash and short-term investments of UGI and its captive insurance company; UGI corporate headquarters’ assets; and our investment in a private equity partnership.