Condensed Consolidated Statements of Income (unaudited) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Revenues	$ 1,440.9	$ 1,153.5	$ 6,378.1	$ 5,006.8
Costs and expenses:
Cost of sales (excluding depreciation shown below)	732.5	618.5	3,430.1	2,337.1
Operating and administrative expenses	496.1	449.4	1,542.4	1,409.0
Impairment of tradenames	75.0	0.0	75.0	0.0
Depreciation	103.9	89.6	297.9	258.1
Amortization	14.9	14.5	43.4	43.4
Other operating income, net	(10.0)	(15.7)	(20.5)	(17.4)
Total costs and expenses	1,412.4	1,156.3	5,368.3	4,030.2
Operating income (loss)	28.5	(2.8)	1,009.8	976.6
Income from equity investees	1.3	0.9	3.0	3.0
Loss on extinguishments of debt	0.0	(4.4)	0.0	(59.7)
Gain (loss) on foreign currency contracts, net	25.6	(16.2)	9.8	(16.1)
Interest expense	(56.5)	(56.8)	(172.8)	(168.0)
(Loss) income before income taxes	(1.1)	(79.3)	849.8	735.8
Income tax (expense) benefit	(10.6)	17.1	(19.6)	(195.3)
Net (loss) income including noncontrolling interests	(11.7)	(62.2)	830.2	540.5
Add net loss (deduct net income) attributable to noncontrolling interests, principally in AmeriGas Partners	64.1	43.2	(135.9)	(108.9)
Net income (loss) attributable to UGI Corporation	$ 52.4	$ (19.0)	$ 694.3	$ 431.6
Earnings (loss) per common share attributable to UGI Corporation stockholders
Basic (in dollars per share)	$ 0.30	$ (0.11)	$ 4.00	$ 2.49
Diluted (in dollars per share)	$ 0.30	$ (0.11)	$ 3.93	$ 2.44
Weighted average common shares outstanding (thousands)
Basic (in shares)	173,991	173,742	173,744	173,625
Diluted (in shares)	176,807	173,742	176,702	177,125
Dividends declared per common share (in dollars per share)	$ 0.26	$ 0.25	$ 0.76	$ 0.725