Condensed Financial Information of Registrant (Parent Company) - Statements of Cash Flows (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2012
Condensed Financial Statements, Captions
NET CASH PROVIDED BY OPERATING ACTIVITIES	$ 1,005.4		$ 801.5		$ 707.7
CASH FLOWS FROM INVESTING ACTIVITIES
Net cash used by investing activities	(487.6)		(553.3)		(1,904.5)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends on UGI Common Stock	(136.1)		(125.8)		(119.1)
Repurchases of UGI Common Stock	(39.8)		0		0
Issuance of Common Stock	10.9		36.4		23.2
Net cash (used) provided by financing activities	(475.7)		(186.1)		1,278.5
Cash and cash equivalents increase	30.2		69.4		81.4
CASH AND CASH EQUIVALENTS
End of year	419.5		389.3		319.9
Beginning of year	389.3		319.9		238.5
Increase	30.2		69.4		81.4
Parent Company
Condensed Financial Statements, Captions
NET CASH PROVIDED BY OPERATING ACTIVITIES	199.7	[1]	139.4	[1]	158.3	[1]
CASH FLOWS FROM INVESTING ACTIVITIES
Net investments in unconsolidated subsidiaries	(47.3)		(59.1)		(54.4)
Net cash used by investing activities	(47.3)		(59.1)		(54.4)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends on UGI Common Stock	(136.1)		(125.8)		(119.1)
Repurchases of UGI Common Stock	(39.8)		0		0
Issuance of Common Stock	23.4		44.5		16.7
Net cash (used) provided by financing activities	(152.5)		(81.3)		(102.4)
Cash and cash equivalents increase	(0.1)		(1.0)		1.5
CASH AND CASH EQUIVALENTS
End of year	0.8		0.9		1.9
Beginning of year	0.9		1.9		0.4
Increase	$ (0.1)		$ (1.0)		$ 1.5

[1] Includes dividends received from unconsolidated subsidiaries of $186.4, $155.2 and $156.0 for the years ended September 30, 2014, 2013 and 2012, respectively.