Condensed Consolidated Statements of Income (unaudited) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Revenues	$ 2,812.0	$ 2,173.8	$ 4,937.2	$ 3,853.3
Costs and expenses:
Cost of sales (excluding depreciation shown below)	1,560.2	1,071.2	2,697.6	1,718.6
Operating and administrative expenses	556.2	491.1	1,046.3	959.6
Depreciation	98.5	84.8	194.0	168.5
Amortization	13.7	14.5	28.5	28.9
Other operating income, net	(6.1)	(1.0)	(10.5)	(1.7)
Total costs and expenses	2,222.5	1,660.6	3,955.9	2,873.9
Operating income	589.5	513.2	981.3	979.4
Income from equity investees	0.7	2.3	1.7	2.1
Loss on extinguishments of debt	0.0	(22.1)	0.0	(55.3)
(Losses) gains on foreign currency contracts, net	(11.0)	(1.2)	(15.8)	0.1
Interest expense	(58.1)	(55.8)	(116.3)	(111.2)
Income (loss) before income taxes	521.1	436.4	850.9	815.1
Income tax expense	(113.4)	(124.6)	(9.0)	(212.4)
Net income including noncontrolling interests	407.7	311.8	841.9	602.7
Deduct net income attributable to noncontrolling interests, principally in AmeriGas Partners	(131.7)	(91.9)	(200.0)	(152.1)
Net income attributable to UGI Corporation	$ 276.0	$ 219.9	$ 641.9	$ 450.6
Earnings per common share attributable to UGI Corporation stockholders
Basic (in dollars per share)	$ 1.59	$ 1.27	$ 3.70	$ 2.60
Diluted (in dollars per share)	$ 1.57	$ 1.24	$ 3.63	$ 2.55
Weighted average common shares outstanding (thousands)
Basic (in shares)	173,570	173,624	173,617	173,567
Diluted (in shares)	176,350	177,136	176,646	176,976
Dividends declared per common share (in dollars per share)	$ 0.25	$ 0.2375	$ 0.5	$ 0.4750