CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (unaudited) - 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			(3.8)
Equity-based compensation expense			8.6
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				(5.4)
Net income	$ 841.9			641.9			200.0
Cash dividends on UGI Common Stock ($0.26, $0.25, $0.52 and $0.50 per share, respectively)				(86.6)
Net losses on derivative instruments	(2.0)				(2.0)
Reclassification of net losses on derivative instruments	2.4				2.4
Benefit plans	0.7				0.7
Foreign currency adjustments	58.2				58.2
Common Stock issued in connection with employee and director plans, net of tax withheld						13.0
Repurchases of UGI Common Stock						(14.1)
Reacquired UGI Common Stock - employee and director plans						(1.9)
Dividends and distributions							(131.8)
Other							0.9
Balance, end of period at Mar. 31, 2018	4,421.0	$ 3,774.3	1,193.4	2,656.6	(34.1)	(41.6)	646.7
Increase (Decrease) in Stockholders' Equity
Cumulative effect of change in accounting principle - ASC 606				0.0
Balance, beginning of period at Dec. 31, 2017			1,189.3	2,429.3	(71.5)	(45.4)	580.4
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			(2.5)
Equity-based compensation expense			6.6
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				(5.4)
Net income	407.7			276.0			131.7
Cash dividends on UGI Common Stock ($0.26, $0.25, $0.52 and $0.50 per share, respectively)				(43.3)
Net losses on derivative instruments	(1.6)				(1.6)
Reclassification of net losses on derivative instruments	2.8				2.8
Benefit plans	0.3				0.3
Foreign currency adjustments	35.9				35.9
Common Stock issued in connection with employee and director plans, net of tax withheld						10.3
Repurchases of UGI Common Stock						(4.6)
Reacquired UGI Common Stock - employee and director plans						(1.9)
Dividends and distributions							(66.1)
Other							0.7
Balance, end of period at Mar. 31, 2018	4,421.0	3,774.3	1,193.4	2,656.6	(34.1)	(41.6)	646.7
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			9.4
Equity-based compensation expense			8.8
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				(11.1)
Net income	485.2			309.6			175.6
Cash dividends on UGI Common Stock ($0.26, $0.25, $0.52 and $0.50 per share, respectively)				(90.5)
Net losses on derivative instruments	(2.7)				(2.7)
Reclassification of net losses on derivative instruments	0.7				0.7
Benefit plans	0.6				0.6
Foreign currency adjustments	(42.4)				(42.4)
Common Stock issued in connection with employee and director plans, net of tax withheld						16.0
Repurchases of UGI Common Stock						(16.9)
Reacquired UGI Common Stock - employee and director plans						(2.8)
Dividends and distributions							(131.5)
Other							0.3
Balance, end of period at Mar. 31, 2019	4,316.0	3,853.0	1,219.0	2,818.2	(160.8)	(23.4)	463.0
Increase (Decrease) in Stockholders' Equity
Cumulative effect of change in accounting principle - ASC 606				0.0
Balance, beginning of period at Dec. 31, 2018			1,206.5	2,620.8	(133.1)	(24.8)	377.2
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			5.7
Equity-based compensation expense			6.8
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	396.7			245.4			151.3
Cash dividends on UGI Common Stock ($0.26, $0.25, $0.52 and $0.50 per share, respectively)				(45.2)
Net losses on derivative instruments	(1.2)				(1.2)
Reclassification of net losses on derivative instruments	0.0				0.0
Benefit plans	0.3				0.3
Foreign currency adjustments	(26.8)				(26.8)
Common Stock issued in connection with employee and director plans, net of tax withheld						3.8
Repurchases of UGI Common Stock						0.0
Reacquired UGI Common Stock - employee and director plans						(2.4)
Dividends and distributions							(65.8)
Other							0.3
Balance, end of period at Mar. 31, 2019	$ 4,316.0	$ 3,853.0	$ 1,219.0	$ 2,818.2	$ (160.8)	$ (23.4)	$ 463.0