Condensed Financial Information of Registrant (Parent Company) - Statements of Cash Flows (Details) - USD ($) $ in Millions		12 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Condensed Financial Statements, Captions
NET CASH PROVIDED BY OPERATING ACTIVITIES		$ 1,163.8	$ 1,005.4	$ 801.5
CASH FLOWS FROM INVESTING ACTIVITIES
Net cash used by investing activities		(976.3)	(487.6)	(553.3)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends on UGI Common Stock		(153.5)	(136.1)	(125.8)
Repurchases of UGI Common Stock		(34.1)	(39.8)	0.0
Issuances of Common Stock		11.9	10.9	36.4
Other		(3.5)	11.8	9.1
Net cash used by financing activities		(217.1)	(475.7)	(186.1)
Cash and cash equivalents (decrease) increase		(49.8)	30.2	69.4
CASH AND CASH EQUIVALENTS
End of year		369.7	419.5	389.3
Beginning of year		419.5	389.3	319.9
(Decrease) increase		(49.8)	30.2	69.4
Dividends from unconsolidated subsidiaries		271.6	186.4	155.2
Parent Company
Condensed Financial Statements, Captions
NET CASH PROVIDED BY OPERATING ACTIVITIES	[1]	277.2	199.7	139.4
CASH FLOWS FROM INVESTING ACTIVITIES
Net investments in unconsolidated subsidiaries		(104.8)	(47.3)	(59.1)
Net cash used by investing activities		(104.8)	(47.3)	(59.1)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends on UGI Common Stock		(153.5)	(136.1)	(125.8)
Repurchases of UGI Common Stock		(34.1)	(39.8)	0.0
Issuances of Common Stock		16.8	23.4	44.5
Other		(0.5)	0.0	0.0
Net cash used by financing activities		(171.3)	(152.5)	(81.3)
Cash and cash equivalents (decrease) increase		1.1	(0.1)	(1.0)
CASH AND CASH EQUIVALENTS
End of year		1.9	0.8	0.9
Beginning of year		0.8	0.9	1.9
(Decrease) increase		$ 1.1	$ (0.1)	$ (1.0)

[1] Includes dividends received from unconsolidated subsidiaries of $271.6, $186.4 and $155.2 for the years ended September 30, 2015, 2014 and 2013, respectively.