CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Revenues	$ 1,199.3	$ 1,363.7	$ 5,434.8	$ 6,170.0
Costs and expenses:
Cost of sales (excluding depreciation and amortization shown below)	416.6	781.4	2,672.8	3,633.3
Operating and administrative expenses	437.9	476.9	1,452.5	1,516.8
Impairment of assets held-for-sale	51.6	0.0	51.6	0.0
Depreciation and amortization	122.5	109.9	362.1	330.0
Other operating income, net	(3.2)	(14.1)	(17.2)	(26.2)
Costs and expenses	1,025.4	1,354.1	4,521.8	5,453.9
Operating income	173.9	9.6	913.0	716.1
Income from equity investees	7.5	1.5	22.0	4.6
Loss on extinguishments of debt	0.0	0.0	0.0	(6.1)
Other non-operating (expense) income, net	(3.9)	0.7	(3.7)	17.6
Interest expense	(80.8)	(60.5)	(247.3)	(181.7)
Income (loss) before income taxes	96.7	(48.7)	684.0	550.5
Income tax (expense) benefit	(12.0)	2.2	(161.7)	(111.8)
Net income (loss) including noncontrolling interests	84.7	(46.5)	522.3	438.7
Add net loss (deduct net income) attributable to noncontrolling interests, principally in AmeriGas Partners prior to the AmeriGas Merger	0.6	44.6	0.5	(131.0)
Net income (loss) attributable to UGI Corporation	$ 85.3	$ (1.9)	$ 522.8	$ 307.7
Earnings (loss) per common share attributable to UGI Corporation stockholders:
Basic (in USD per share)	$ 0.41	$ (0.01)	$ 2.50	$ 1.76
Diluted (in USD per share)	$ 0.41	$ (0.01)	$ 2.49	$ 1.73
Weighted-average common shares outstanding (thousands):
Basic (in shares)	208,598	174,759	208,989	174,541
Diluted (in shares)	208,975	174,759	210,009	177,389