Condensed Consolidated Statements of Changes in Equity (unaudited) - USD ($) $ in Millions	Total	Total UGI Corporation stockholders’ equity	Common stock, without par value	Retained earnings	Accumulated other comprehensive income (loss)	Treasury stock	Noncontrolling interests
Increase (Decrease) in Stockholders' Equity
Cumulative effect of change in accounting for employee share-based payments				$ 5.0
Balance, beginning of period at Sep. 30, 2016			$ 1,201.6	1,840.9	$ (154.7)	$ (36.9)	$ 750.9
Increase (Decrease) in Stockholders' Equity
Common Stock issued in connection with employee and director plans (including losses on treasury stock transactions), net of tax withheld			(26.4)
Equity-based compensation expense			11.2
Sale of treasury stock			1.4			0.2
Losses on treasury stock transactions in connection with employee and director plans				0.0
Net income	$ 540.5			431.6			108.9
Cash dividends on Common Stock				(125.6)
Net gains on derivative instruments	5.2				5.2
Reclassification of net losses (gains) on derivative instruments	(10.1)				(10.1)
Benefit plans	1.3				1.3
Foreign currency adjustments	22.4				22.4
Common stock issued in connection with employee and director plans, net of tax withheld						44.7
Repurchases of Common Stock						(28.7)
Reacquired common stock — employee and director plans						(6.4)
Dividends and distributions							(195.8)
Other							0.4
Balance, end of period at Jun. 30, 2017	3,841.1	$ 3,176.7	1,187.8	2,151.9	(135.9)	(27.1)	664.4
Increase (Decrease) in Stockholders' Equity
Net income	(62.2)
Net gains on derivative instruments	(6.6)
Reclassification of net losses (gains) on derivative instruments	(0.2)
Benefit plans	(0.1)
Foreign currency adjustments	75.5
Balance, end of period at Jun. 30, 2017	3,841.1	3,176.7	1,187.8	2,151.9	(135.9)	(27.1)	664.4
Increase (Decrease) in Stockholders' Equity
Cumulative effect of change in accounting for employee share-based payments				0.0
Balance, beginning of period at Sep. 30, 2017	3,740.9		1,188.6	2,106.7	(93.4)	(38.6)	577.6
Increase (Decrease) in Stockholders' Equity
Common Stock issued in connection with employee and director plans (including losses on treasury stock transactions), net of tax withheld			(1.7)
Equity-based compensation expense			11.6
Sale of treasury stock			0.0			0.0
Losses on treasury stock transactions in connection with employee and director plans				(32.0)
Net income	830.2			694.3			135.9
Cash dividends on Common Stock				(131.8)
Net gains on derivative instruments	1.7				1.7
Reclassification of net losses (gains) on derivative instruments	2.6				2.6
Benefit plans	1.3				1.3
Foreign currency adjustments	(23.8)				(23.8)
Common stock issued in connection with employee and director plans, net of tax withheld						75.4
Repurchases of Common Stock						(43.5)
Reacquired common stock — employee and director plans						(6.1)
Dividends and distributions							(197.5)
Other							0.5
Balance, end of period at Jun. 30, 2018	4,227.8	3,711.3	1,198.5	2,637.2	(111.6)	(12.8)	516.5
Increase (Decrease) in Stockholders' Equity
Net income	(11.7)
Net gains on derivative instruments	3.7
Reclassification of net losses (gains) on derivative instruments	0.2
Benefit plans	0.6
Foreign currency adjustments	(82.0)
Balance, end of period at Jun. 30, 2018	$ 4,227.8	$ 3,711.3	$ 1,198.5	$ 2,637.2	$ (111.6)	$ (12.8)	$ 516.5