Quarterly Data (unaudited) - Schedule of Quarterly Data(Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended										12 Months Ended
	Sep. 30, 2015	Jun. 30, 2015		Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Quarterly Financial Data
Revenues	$ 1,082.8	$ 1,148.1	[1]	$ 2,455.6	$ 2,004.6	$ 1,311.4	$ 1,486.7	$ 3,163.3	$ 2,315.9	[2]	$ 6,691.1	$ 8,277.3	$ 7,194.7
Operating income (loss)	(6.6)	56.1	[1]	702.1	83.3	(9.4)	62.7	588.6	363.7	[2]	834.9	1,005.6	831.1
Net income attributable to UGI Corporation	(52.5)	(15.9)	[1]	482.2	0.2	(60.0)	(12.7)	387.8	217.5	[2]	414.0	532.6	427.6
Net income (loss) attributable to UGI Corporation	$ (9.2)	$ 9.6	[1]	$ 246.5	$ 34.1	$ (19.8)	$ 20.6	$ 214.4	$ 122.0	[2]	$ 281.0	$ 337.2	$ 278.1
Earnings (loss) per common share attributable to UGI Corporation stockholders:
Basic (in dollars per share)	$ (0.05)	$ 0.06	[1]	$ 1.42	$ 0.20	$ (0.11)	$ 0.12	$ 1.24	$ 0.71	[2]	$ 1.62	$ 1.95	$ 1.63
Diluted (in dollars per share)	$ (0.05)	$ 0.05	[1]	$ 1.40	$ 0.19	$ (0.11)	$ 0.12	$ 1.22	$ 0.70	[2]	$ 1.60	$ 1.92	$ 1.60
Decrease in net income attributable to UGI Corporation		$ 4.6
Decrease in net income attribuable to UGI Corporation (in usd per share)		$ 0.03
France | Foreign Tax Authority
Earnings (loss) per common share attributable to UGI Corporation stockholders:
Income tax expense					$ 5.7
Restatement Adjustment
Quarterly Financial Data
Net income (loss) attributable to UGI Corporation									$ 5.7
Earnings (loss) per common share attributable to UGI Corporation stockholders:
Diluted (in dollars per share)									$ 0.03

[1] Includes loss on early extinguishment of debt at Antargaz which decreased net income attributable to UGI Corporation by $4.6 or $0.03 per diluted share (see Note 6)

[2] Includes income tax expense of $5.7 to reflect the retroactive effects to Fiscal 2013 of new tax legislation in France regarding the deductibility of certain interest expense which decreased net income attributable to UGI Corporation by $5.7 or $0.03 per diluted share (see Note 7).