Condensed Financial Information of Registrant (Parent Company) (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2011
Condensed Financial Statements, Captions [Line Items]
NET CASH PROVIDED BY OPERATING ACTIVITIES	$ 801.5		$ 707.7		$ 554.7
CASH FLOWS FROM INVESTING ACTIVITIES
Net cash used by investing activities	(553.3)		(1,904.5)		(415.4)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends on UGI Common Stock	(125.8)		(119.1)		(113.8)
Issuance of Common Stock	36.4		23.2		27.3
Net cash (used) provided by financing activities	(186.1)		1,278.5		(152.1)
Cash and cash equivalents increase (decrease)	69.4		81.4		(22.2)
Cash and cash equivalents:
End of year	389.3		319.9		238.5
Beginning of year	319.9		238.5		260.7
Increase (decrease)	69.4		81.4		(22.2)
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
NET CASH PROVIDED BY OPERATING ACTIVITIES	139.4	[1]	158.3	[1]	201.6	[1]
CASH FLOWS FROM INVESTING ACTIVITIES
Net investments in unconsolidated subsidiaries	(59.1)		(54.4)		(119.4)
Net cash used by investing activities	(59.1)		(54.4)		(119.4)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends on UGI Common Stock	(125.8)		(119.1)		(113.8)
Issuance of Common Stock	44.5		16.7		31.0
Net cash (used) provided by financing activities	(81.3)		(102.4)		(82.8)
Cash and cash equivalents increase (decrease)	(1.0)		1.5		(0.6)
Cash and cash equivalents:
End of year	0.9		1.9		0.4
Beginning of year	1.9		0.4		1.0
Increase (decrease)	$ (1.0)		$ 1.5		$ (0.6)

[1] Includes dividends received from unconsolidated subsidiaries of $155.2, $156.0 and $188.9, for the years ended September 30, 2013, 2012 and 2011, respectively.