Condensed Consolidated Statements of Income (unaudited) - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Revenues	$ 2,125.2	$ 1,679.5
Costs and expenses:
Cost of sales (excluding depreciation shown below)	1,137.4	647.4
Operating and administrative expenses	490.1	468.5
Depreciation	95.5	83.7
Amortization	14.8	14.4
Other operating income, net	(4.4)	(0.7)
Total costs and expenses	1,733.4	1,213.3
Operating income	391.8	466.2
Income (loss) from equity investees	1.0	(0.2)
Loss on extinguishments of debt	0.0	(33.2)
(Losses) gains on foreign currency contracts, net	(4.8)	1.3
Interest expense	(58.2)	(55.4)
Income (loss) before income taxes	329.8	378.7
Income tax benefit (expense)	104.4	(87.8)
Net income including noncontrolling interests	434.2	290.9
Deduct net income attributable to noncontrolling interests, principally in AmeriGas Partners	(68.3)	(60.2)
Net income attributable to UGI Corporation	$ 365.9	$ 230.7
Earnings per common share attributable to UGI Corporation stockholders
Basic (in dollars per share)	$ 2.11	$ 1.33
Diluted (in dollars per share)	$ 2.07	$ 1.30
Weighted average common shares outstanding (thousands)
Basic (in shares)	173,670	173,512
Diluted (in shares)	176,948	176,984
Dividends declared per common share (in dollars per share)	$ 0.25	$ 0.2375