Consolidated Statements of Income - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Revenues	$ 6,120.7	$ 5,685.7	$ 6,691.1
Costs and Expenses
Cost of sales (excluding depreciation shown below)	2,837.3	2,437.5	3,736.5
Operating and administrative expenses	1,857.8	1,865.9	1,773.9
Utility taxes other than income taxes	15.6	15.8	16.1
Depreciation	357.3	338.6	313.2
Amortization	59.0	62.3	60.9
Other operating income, net	(10.5)	(22.4)	(44.4)
Total costs and expenses	5,116.5	4,697.7	5,856.2
Operating income	1,004.2	988.0	834.9
Income (loss) from equity investees	4.3	(0.2)	(1.2)
Loss on extinguishments of debt	(59.7)	(48.9)	0.0
Losses on foreign currency contracts, net	(23.9)	0.0	0.0
Interest expense	(223.5)	(228.9)	(241.9)
Income before income taxes	701.4	710.0	591.8
Income taxes	(177.6)	(221.2)	(177.8)
Net income including noncontrolling interests	523.8	488.8	414.0
Deduct net income attributable to noncontrolling interests, principally in AmeriGas Partners	(87.2)	(124.1)	(133.0)
Net income attributable to UGI Corporation	$ 436.6	$ 364.7	$ 281.0
Earnings per common share attributable to UGI Corporation stockholders:
Basic (in dollars per share)	$ 2.51	$ 2.11	$ 1.62
Diluted (in dollars per share)	$ 2.46	$ 2.08	$ 1.60
Weighted-average common shares outstanding (thousands):
Basic (in shares)	173,662	173,154	173,115
Diluted (in shares)	177,159	175,572	175,667
Dividends declared per common share (in dollars per share)	$ 0.975	$ 0.930	$ 0.890