CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Millions	Total	Total UGI 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 principle - ASC 606				$ 0.0
Balance, beginning of period at Sep. 30, 2017			$ 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
Reclassification of stranded income tax effects related to TCJA				0.0	0.0
Losses on common stock transactions in connection with employee and director plans				(32.0)
Net income (loss)	$ 830.2			694.3			135.9
Cash dividends on UGI Common Stock ($0.30, $0.26, $0.82 and $0.76 per share, respectively)				(131.8)
Net (losses) gains on derivative instruments					1.7
Reclassification of net losses on derivative instruments					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 UGI Common Stock						(43.5)
Reacquired UGI 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
Cumulative effect of change in accounting principle - ASC 606				0.0
Balance, beginning of period at Mar. 31, 2018			1,193.4	2,656.6	(34.1)	(41.6)	646.7
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			2.1
Equity-based compensation expense			3.0
Reclassification of stranded income tax effects related to TCJA				0.0	0.0
Losses on common stock transactions in connection with employee and director plans				(26.6)
Net income (loss)	(11.7)			52.4			(64.1)
Cash dividends on UGI Common Stock ($0.30, $0.26, $0.82 and $0.76 per share, respectively)				(45.2)
Net (losses) gains on derivative instruments					3.7
Reclassification of net losses on derivative instruments					0.2
Benefit plans	0.6				0.6
Foreign currency adjustments	(82.0)				(82.0)
Common Stock issued in connection with employee and director plans, net of tax withheld						62.4
Repurchases of UGI Common Stock						(29.4)
Reacquired UGI Common Stock - employee and director plans						(4.2)
Dividends and distributions							(65.7)
Other							(0.4)
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
Balance, beginning of period at Sep. 30, 2018	4,100.0		1,200.8	2,610.7	(110.4)	(19.7)	418.6
Increase (Decrease) in Stockholders' Equity
Cumulative effect of change in accounting principle - ASC 606				(7.1)
Balance, beginning of period at Sep. 30, 2018	4,100.0		1,200.8	2,610.7	(110.4)	(19.7)	418.6
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			10.7
Equity-based compensation expense			12.4
Reclassification of stranded income tax effects related to TCJA	(6.6)			6.6	(6.6)
Losses on common stock transactions in connection with employee and director plans				(13.9)
Net income (loss)	438.7			307.7			131.0
Cash dividends on UGI Common Stock ($0.30, $0.26, $0.82 and $0.76 per share, respectively)				(142.8)
Net (losses) gains on derivative instruments					(4.3)
Reclassification of net losses on derivative instruments					1.4
Benefit plans	0.8				0.8
Foreign currency adjustments	(26.3)				(26.3)
Common Stock issued in connection with employee and director plans, net of tax withheld						20.6
Repurchases of UGI Common Stock						(16.9)
Reacquired UGI Common Stock - employee and director plans						(2.8)
Dividends and distributions							(197.3)
Other							0.5
Balance, end of period at Jun. 30, 2019	4,173.7	3,820.9	1,223.9	2,761.2	(145.4)	(18.8)	352.8
Increase (Decrease) in Stockholders' Equity
Cumulative effect of change in accounting principle - ASC 606				0.0
Balance, beginning of period at Mar. 31, 2019			1,219.0	2,818.2	(160.8)	(23.4)	463.0
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			1.3
Equity-based compensation expense			3.6
Reclassification of stranded income tax effects related to TCJA				0.0	0.0
Losses on common stock transactions in connection with employee and director plans				(2.8)
Net income (loss)	(46.5)			(1.9)			(44.6)
Cash dividends on UGI Common Stock ($0.30, $0.26, $0.82 and $0.76 per share, respectively)				(52.3)
Net (losses) gains on derivative instruments					(1.6)
Reclassification of net losses on derivative instruments					0.7
Benefit plans	0.2				0.2
Foreign currency adjustments	16.1				16.1
Common Stock issued in connection with employee and director plans, net of tax withheld						4.6
Repurchases of UGI Common Stock						0.0
Reacquired UGI Common Stock - employee and director plans						0.0
Dividends and distributions							(65.8)
Other							0.2
Balance, end of period at Jun. 30, 2019	$ 4,173.7	$ 3,820.9	$ 1,223.9	$ 2,761.2	$ (145.4)	$ (18.8)	$ 352.8