Condensed Consolidated Statements of Changes in Equity (USD $) In Millions	Total	Parent [Member]	Common stock, without par value	Retained earnings	Accumulated other comprehensive income (loss)	Treasury stock	Noncontrolling Interest [Member]	Accumulated Defined Benefit Plans Adjustment [Member] Accumulated other comprehensive income (loss)
Stockholders' Equity Attributable to Noncontrolling Interest at Sep. 30, 2011							$ 213.4
Beginning Balance at Sep. 30, 2011			937.4	1,085.8	(17.7)	(27.8)
Common Stock issued in connection with employee and director plans, net of tax withheld			5.6
Dividend reinvestment plan			1.1			0.4
Excess tax benefits realized on equity-based compensation			0.5
Stock-based compensation expense			6.0
Adjustments to reflect change in ownership of AmeriGas Partners, net of tax			194.4		1.9		(321.4)
Net income attributable to UGI Corporation	220.4			220.4
Cash dividends on Common Stock				(58.3)
Net gains (losses) on derivative instruments, net of tax	(80.7)				(58.7)
Reclassification of net losses on derivative instruments, net of tax	(44.7)				31.7
Benefit plans, net of tax								0.2
Foreign currency, net of tax	1.7				1.7
Common Stock issued in connection with employee and director plans, net of tax withheld						1.8
Reacquired common stock - employee and director plans						0
Net income attributable to noncontrolling interests, principally in AmeriGas Partners	116.7						116.7
Net losses on derivative instruments							(22.0)
Reclassifications of net losses on derivative instruments							13.0
Dividends and distributions							(71.6)
AmeriGas Partners Common Unit public offering							276.6
AmeriGas Partners Common Units issued for Heritage Acquisition							1,132.6
Other							2.4
Total equity	3,666.1
Stockholders' Equity Attributable to Noncontrolling Interest at Mar. 31, 2012	1,339.7						1,339.7
Ending Balance at Mar. 31, 2012	2,326.4	2,326.4	1,145.0	1,247.9	(40.9)	(25.6)
Stockholders' Equity Attributable to Noncontrolling Interest at Sep. 30, 2012	1,085.7						1,085.7
Beginning Balance at Sep. 30, 2012	2,233.1		1,157.7	1,166.1	(62.0)	(28.7)
Common Stock issued in connection with employee and director plans, net of tax withheld			15.5
Dividend reinvestment plan			1.0			0.5
Excess tax benefits realized on equity-based compensation			4.7
Stock-based compensation expense			7.0
Adjustments to reflect change in ownership of AmeriGas Partners, net of tax			0		0		0
Net income attributable to UGI Corporation	274.5			274.5
Cash dividends on Common Stock				(61.2)
Net gains (losses) on derivative instruments, net of tax	(0.1)				3.5
Reclassification of net losses on derivative instruments, net of tax	(50.8)				19.6
Benefit plans, net of tax								0.8
Foreign currency, net of tax	(7.5)				(7.5)
Common Stock issued in connection with employee and director plans, net of tax withheld						17.2
Reacquired common stock - employee and director plans						(18.7)
Net income attributable to noncontrolling interests, principally in AmeriGas Partners	222.4						222.4
Net losses on derivative instruments							(3.6)
Reclassifications of net losses on derivative instruments							31.2
Dividends and distributions							(110.7)
AmeriGas Partners Common Unit public offering							0
AmeriGas Partners Common Units issued for Heritage Acquisition							0
Other							2.3
Total equity	3,717.3
Stockholders' Equity Attributable to Noncontrolling Interest at Mar. 31, 2013	1,227.3						1,227.3
Ending Balance at Mar. 31, 2013	$ 2,490.0	$ 2,490.0	$ 1,185.9	$ 1,379.4	$ (45.6)	$ (29.7)