Consolidated Statements of Changes In Equity - USD ($) $ in Millions	Total	Total UGI Corporation stockholders’ equity	Common stock, without par value	Retained earnings	Accumulated other comprehensive income (loss)	Treasury stock	Noncontrolling interests
Balance, beginning of year at Sep. 30, 2014			$ 1,215.6	$ 1,502.6	$ (21.2)	$ (44.7)	$ 1,004.1
Common stock issued:
Employee and director plans (including losses on treasury stock transactions), net of tax withheld			(22.1)
Employee and director plans						40.5
Excess tax benefits realized on equity-based compensation			8.3
Equity-based compensation expense			13.2
Loss from acquisition of noncontrolling interests through business combination			(0.4)
Net income including noncontrolling interests	$ 414.0			281.0			133.0
Cash dividends on common stock				(153.5)
Net gains (losses) on derivative instruments	16.8				16.8
Reclassification of net (gains) losses on derivative instruments	1.6				3.7
Benefit plans, principally actuarial gains (losses)	(1.2)				(1.2)
Reclassifications of benefit plans actuarial losses and net prior service credits (net of tax of $(2.1), $(0.4) and $(0.8), respectively)	1.4				1.4
Foreign currency gains (losses) on long-term intra-company transactions	(50.6)				(50.6)
Foreign currency translation adjustments	(63.5)				(63.5)
Repurchases of common stock						(34.1)
Reacquired common stock – employee and director plans						(6.6)
Reclassification of net gains on derivative instruments							(2.1)
Dividends and distributions							(249.4)
Change in noncontrolling interests as a result of business combination							(5.2)
Balance, end of year at Sep. 30, 2015	3,565.6	$ 2,685.2	1,214.6	1,630.1	(114.6)	(44.9)	880.4
Common stock issued:
Employee and director plans (including losses on treasury stock transactions), net of tax withheld			(39.7)
Employee and director plans						84.7
Excess tax benefits realized on equity-based compensation			15.5
Equity-based compensation expense			11.2
Net income including noncontrolling interests	488.8			364.7			124.1
Cash dividends on common stock				(160.7)
Net gains (losses) on derivative instruments	(16.5)				(16.5)
Reclassification of net (gains) losses on derivative instruments	(8.1)				(8.1)
Benefit plans, principally actuarial gains (losses)	(10.9)				(10.9)
Reclassifications of benefit plans actuarial losses and net prior service credits (net of tax of $(2.1), $(0.4) and $(0.8), respectively)	2.2				2.2
Foreign currency gains (losses) on long-term intra-company transactions	(1.9)				(1.9)
Foreign currency translation adjustments	(4.9)				(4.9)
Repurchases of common stock						(47.6)
Reacquired common stock – employee and director plans						(29.1)
Dividends and distributions							(257.3)
Other							3.7
Balance, end of year at Sep. 30, 2016	3,595.0	2,844.1	1,201.6	1,834.1	(154.7)	(36.9)	750.9
Common stock issued:
Cumulative effect of change in accounting for share-based payments				4.9
Employee and director plans (including losses on treasury stock transactions), net of tax withheld			(28.2)
Employee and director plans						49.6
Equity-based compensation expense			13.2
Sale of treasury stock			2.0			0.2
Net income including noncontrolling interests	523.8			436.6			87.2
Cash dividends on common stock				(168.9)
Net gains (losses) on derivative instruments	1.7				1.7
Reclassification of net (gains) losses on derivative instruments	(9.7)				(9.7)
Benefit plans, principally actuarial gains (losses)	6.5				6.5
Reclassifications of benefit plans actuarial losses and net prior service credits (net of tax of $(2.1), $(0.4) and $(0.8), respectively)	3.4				3.4
Foreign currency gains (losses) on long-term intra-company transactions	24.8				24.8
Foreign currency translation adjustments	34.6				34.6
Repurchases of common stock						(43.3)
Reacquired common stock – employee and director plans						(8.2)
Dividends and distributions							(261.6)
Other							1.1
Balance, end of year at Sep. 30, 2017	$ 3,740.9	$ 3,163.3	$ 1,188.6	$ 2,106.7	$ (93.4)	$ (38.6)	$ 577.6