CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Millions	Total	Common stock, without par value	Retained earnings	Accumulated other comprehensive income (loss)	Treasury stock	Total UGI stockholders’ equity	Noncontrolling interests
Increase (Decrease) in Stockholders' Equity
Cumulative effect of change in accounting principle - ASC 606			$ (7.1)
Balance, beginning of period at Sep. 30, 2018		$ 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, net of tax withheld		3.7
Equity-based compensation expense		2.0
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			(8.3)
Net income (loss)	88.5		64.2				24.3
Cash dividends on UGI Common Stock ($0.325 and $0.260 per share, respectively)			(45.3)
Net gains (losses) on derivative instruments	(1.5)			(1.5)
Reclassification of net losses on derivative instruments	0.7			0.7
Benefit plans	0.3			0.3
Foreign currency adjustments	(15.6)			(15.6)
Common Stock issued in connection with employee and director plans, net of tax withheld					12.2
Repurchases of UGI Common Stock					(16.9)
Reacquired UGI Common Stock - employee and director plans					(0.4)
Dividends and distributions							(65.7)
Balance, end of period at Dec. 31, 2018	4,046.6	1,206.5	2,620.8	(133.1)	(24.8)	$ 3,669.4	377.2
Balance, beginning of period at Sep. 30, 2019	3,827.2	1,396.9	2,653.1	(216.6)	(15.9)		9.7
Increase (Decrease) in Stockholders' Equity
Common Stock issued in connection with employee and director plans, net of tax withheld		0.3
Equity-based compensation expense		1.9
Losses on common stock transactions in connection with employee and director plans			(0.7)
Net income (loss)	212.0		212.0
Cash dividends on UGI Common Stock ($0.325 and $0.260 per share, respectively)			(67.9)
Net gains (losses) on derivative instruments	5.6			5.6
Reclassification of net losses on derivative instruments	0.7			0.7
Benefit plans	0.2			0.2
Foreign currency adjustments	47.0			47.0
Common Stock issued in connection with employee and director plans, net of tax withheld					1.1
Repurchases of UGI Common Stock					(22.6)
Other		(0.7)	1.0				(0.5)
Balance, end of period at Dec. 31, 2019	$ 4,004.6	$ 1,398.4	$ 2,797.5	$ (163.1)	$ (37.4)	$ 3,995.4	$ 9.2