Segment Information - Schedule of Segment Reporting Information (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Sep. 30, 2019
Segment Reporting Information [Line Items]
Revenues	$ 2,228.9	$ 2,606.1	$ 4,235.5	$ 4,806.3
Cost of sales	1,248.2	1,426.9	2,256.2	2,851.9
Operating income (loss)	361.9	538.8	739.1	706.5
Income from equity investees	8.0	1.6	14.5	3.1
Loss on extinguishments of debt	0.0	0.0	0.0	(6.1)
Other non-operating income, net	11.7	7.9	0.2	16.9
Earnings (loss) before interest expense and income taxes	381.6	548.3	753.8	720.4
Interest expense	(82.4)	(61.0)	(166.5)	(121.2)
Income before income taxes	299.2	487.3	587.3	599.2
Noncontrolling interests’ net income (loss)	0.1	151.3	0.1	175.6
Depreciation and amortization	120.2	108.9	239.6	220.1
Capital expenditures (including the effects of accruals)	159.0	151.2	310.8	313.0
Total assets	14,135.5	12,350.9	14,135.5	12,350.9	$ 13,346.6
Short-term borrowings	653.5	341.0	653.5	341.0	796.3
Goodwill	3,465.5	3,147.8	3,465.5	3,147.8	$ 3,456.4
Eliminations
Segment Reporting Information [Line Items]
Revenues	(94.5)	(124.8)	(174.2)	(236.4)
Cost of sales	(93.4)	(123.6)	(172.5)	(234.4)
Operating income (loss)	(0.3)	(0.4)	0.0	0.0
Income from equity investees	0.0	0.0	0.0	0.0
Loss on extinguishments of debt				0.0
Other non-operating income, net	0.0	0.0	0.0	0.0
Earnings (loss) before interest expense and income taxes	(0.3)	(0.4)	0.0	0.0
Interest expense	0.0	0.0	0.0	0.0
Income before income taxes	(0.3)	(0.4)	0.0	0.0
Noncontrolling interests’ net income (loss)	0.0	0.0	0.0	0.0
Depreciation and amortization	(0.2)	(0.1)	(0.2)	(0.1)
Capital expenditures (including the effects of accruals)	0.0	0.0	0.0	0.0
Total assets	(370.3)	(121.5)	(370.3)	(121.5)
Short-term borrowings	0.0	0.0	0.0	0.0
Goodwill	0.0	0.0	0.0	0.0
Eliminations \| AmeriGas Propane
Segment Reporting Information [Line Items]
Revenues	0.0	0.0	0.0	0.0
Eliminations \| UGI International
Segment Reporting Information [Line Items]
Revenues	0.0	0.0	0.0	0.0
Eliminations \| Midstream & Marketing
Segment Reporting Information [Line Items]
Revenues	77.4	98.8	141.6	185.7
Eliminations \| UGI Utilities
Segment Reporting Information [Line Items]
Revenues	16.5	25.3	31.2	48.9
Corporate, Intersegment Eliminations & Other
Segment Reporting Information [Line Items]
Revenues	0.6	0.7	1.4	1.8
Operating Segments \| AmeriGas Propane
Segment Reporting Information [Line Items]
Revenues	802.0	971.6	1,532.4	1,791.8
Cost of sales	325.6	435.2	614.8	813.7
Operating income (loss)	206.0	247.3	371.3	413.9
Income from equity investees	0.0	0.0	0.0	0.0
Loss on extinguishments of debt				0.0
Other non-operating income, net	0.0	0.0	0.0	0.0
Earnings (loss) before interest expense and income taxes	206.0	247.3	371.3	413.9
Interest expense	(41.2)	(42.2)	(83.7)	(84.6)
Income before income taxes	164.8	205.1	287.6	329.3
Noncontrolling interests’ net income (loss)	0.0	139.3	0.0	220.8
Depreciation and amortization	44.9	44.3	88.8	90.0
Capital expenditures (including the effects of accruals)	35.9	25.8	74.4	56.8
Total assets	4,508.5	3,978.1	4,508.5	3,978.1
Short-term borrowings	201.0	236.0	201.0	236.0
Goodwill	2,003.0	2,003.1	2,003.0	2,003.1
Operating Segments \| UGI International
Segment Reporting Information [Line Items]
Revenues	703.4	783.2	1,354.8	1,493.9
Cost of sales	401.6	444.7	770.0	893.3
Operating income (loss)	116.8	126.9	212.6	185.2
Income from equity investees	0.1	0.1	0.1	0.1
Loss on extinguishments of debt				0.0
Other non-operating income, net	9.3	3.1	13.7	3.8
Earnings (loss) before interest expense and income taxes	126.2	130.1	226.4	189.1
Interest expense	(7.7)	(6.1)	(15.3)	(11.5)
Income before income taxes	118.5	124.0	211.1	177.6
Noncontrolling interests’ net income (loss)	0.1	0.2	0.1	0.3
Depreciation and amortization	30.4	30.6	61.6	62.0
Capital expenditures (including the effects of accruals)	21.6	22.1	41.9	49.9
Total assets	3,226.6	3,229.6	3,226.6	3,229.6
Short-term borrowings	185.5	0.0	185.5	0.0
Goodwill	938.2	944.8	938.2	944.8
Operating Segments \| Midstream & Marketing
Segment Reporting Information [Line Items]
Revenues	422.2	542.4	794.7	1,001.8
Revenues	344.8	443.6	653.1	816.1
Cost of sales	298.3	449.3	562.5	826.8
Operating income (loss)	71.3	51.3	126.4	92.4
Income from equity investees	7.9	1.5	14.4	3.0
Loss on extinguishments of debt				0.0
Other non-operating income, net	0.0	0.0	0.0	0.0
Earnings (loss) before interest expense and income taxes	79.2	52.8	140.8	95.4
Interest expense	(11.4)	(0.5)	(22.9)	(1.0)
Income before income taxes	67.8	52.3	117.9	94.4
Noncontrolling interests’ net income (loss)	0.0	0.0	0.0	0.0
Depreciation and amortization	19.0	11.5	37.4	23.0
Capital expenditures (including the effects of accruals)	23.5	32.3	46.0	57.4
Total assets	2,823.9	1,500.9	2,823.9	1,500.9
Short-term borrowings	43.0	0.0	43.0	0.0
Goodwill	342.2	17.8	342.2	17.8
Operating Segments \| UGI Utilities
Segment Reporting Information [Line Items]
Revenues	392.6	429.6	721.9	752.3
Revenues	376.1	404.3	690.7	703.4
Cost of sales	184.0	218.0	335.6	377.5
Operating income (loss)	116.0	119.9	207.8	196.9
Income from equity investees	0.0	0.0	0.0	0.0
Loss on extinguishments of debt				0.0
Other non-operating income, net	0.0	0.4	(0.2)	0.8
Earnings (loss) before interest expense and income taxes	116.0	120.3	207.6	197.7
Interest expense	(13.5)	(12.2)	(27.1)	(23.9)
Income before income taxes	102.5	108.1	180.5	173.8
Noncontrolling interests’ net income (loss)	0.0	0.0	0.0	0.0
Depreciation and amortization	25.8	22.3	51.5	44.8
Capital expenditures (including the effects of accruals)	78.0	70.8	148.5	148.1
Total assets	3,730.2	3,438.4	3,730.2	3,438.4
Short-term borrowings	224.0	105.0	224.0	105.0
Goodwill	182.1	182.1	182.1	182.1
Corporate & Other
Segment Reporting Information [Line Items]
Revenues	2.6	3.4	4.5	1.1
Cost of sales	132.1	3.3	145.8	175.0
Operating income (loss)	(147.9)	(6.2)	(179.0)	(181.9)
Income from equity investees	0.0	0.0	0.0	0.0
Loss on extinguishments of debt				(6.1)
Other non-operating income, net	2.4	4.4	(13.3)	12.3
Earnings (loss) before interest expense and income taxes	(145.5)	(1.8)	(192.3)	(175.7)
Interest expense	(8.6)	0.0	(17.5)	(0.2)
Income before income taxes	(154.1)	(1.8)	(209.8)	(175.9)
Noncontrolling interests’ net income (loss)	0.0	11.8	0.0	(45.5)
Depreciation and amortization	0.3	0.3	0.5	0.4
Capital expenditures (including the effects of accruals)	0.0	0.2	0.0	0.8
Total assets	216.6	325.4	216.6	325.4
Short-term borrowings	0.0	0.0	0.0	0.0
Goodwill	$ 0.0	$ 0.0	$ 0.0	0.0
Corporate & Other \| AmeriGas Propane
Segment Reporting Information [Line Items]
Loss on extinguishments of debt				0.0
Corporate & Other \| UGI International
Segment Reporting Information [Line Items]
Loss on extinguishments of debt				(6.1)
Corporate & Other \| Midstream & Marketing
Segment Reporting Information [Line Items]
Loss on extinguishments of debt				$ 0.0

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