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Condensed Financial Information of Registrant (Parent Company) - Statements of Cash Flows (Details) - USD ($) $ in Millions		12 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Condensed Financial Statements, Captions
NET CASH PROVIDED BY OPERATING ACTIVITIES		$ 969.7	$ 1,163.8	$ 1,005.4
CASH FLOWS FROM INVESTING ACTIVITIES
Net cash used by investing activities		(558.6)	(976.3)	(487.6)
CASH FLOWS FROM FINANCING ACTIVITIES
Payment of dividends on Common Stock		(160.7)	(153.5)	(136.1)
Purchases of UGI Common Stock		(47.6)	(34.1)	(39.8)
Issuances of Common Stock		13.7	11.9	10.9
Other		15.5	(3.5)	11.8
Net cash used by financing activities		(275.1)	(217.1)	(475.7)
Cash and cash equivalents increase (decrease)		133.1	(49.8)	30.2
CASH AND CASH EQUIVALENTS
End of year		502.8	369.7	419.5
Beginning of year		369.7	419.5	389.3
Increase (decrease)		133.1	(49.8)	30.2
Dividends from unconsolidated subsidiaries		193.1	271.6	186.4
Parent Company
Condensed Financial Statements, Captions
NET CASH PROVIDED BY OPERATING ACTIVITIES	[1]	195.6	277.2	199.7
CASH FLOWS FROM INVESTING ACTIVITIES
Net investments in unconsolidated subsidiaries		(8.9)	(104.8)	(47.3)
Net cash used by investing activities		(8.9)	(104.8)	(47.3)
CASH FLOWS FROM FINANCING ACTIVITIES
Payment of dividends on Common Stock		(160.7)	(153.5)	(136.1)
Purchases of UGI Common Stock		(47.6)	(34.1)	(39.8)
Issuances of Common Stock		24.5	16.8	23.4
Other		0.0	(0.5)	0.0
Net cash used by financing activities		(183.8)	(171.3)	(152.5)
Cash and cash equivalents increase (decrease)		2.9	1.1	(0.1)
CASH AND CASH EQUIVALENTS
End of year		4.8	1.9	0.8
Beginning of year		1.9	0.8	0.9
Increase (decrease)		$ 2.9	$ 1.1	$ (0.1)
[1] Includes dividends received from unconsolidated subsidiaries of $193.1, $271.6 and $186.4 for the years ended September 30, 2016, 2015 and 2014, respectively.

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