Quarterly Data (unaudited) - Schedule of Quarterly Data(Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended										12 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Quarterly Financial Data [Abstract]
Revenues	$ 1,311.4	$ 1,486.7	$ 3,163.3	$ 2,315.9	[1]	$ 1,259.0	[2]	$ 1,374.3	$ 2,542.7	$ 2,018.7	$ 8,277.3	$ 7,194.7	$ 6,521.3
Operating income (loss)	(9.4)	62.7	588.6	363.7	[1]	(12.3)	[2]	41.5	507.7	294.2	1,005.6	831.1	538.6
Net income (loss)	(60.0)	(12.7)	387.8	217.5	[1]	(59.1)	[2]	(22.8)	341.7	167.8	532.6	427.6	197.7
Net income (loss) attributable to UGI Corporation	$ (19.8)	$ 20.6	$ 214.4	$ 122.0	[1]	$ (14.2)	[2]	$ 9.1	$ 180.7	$ 102.5	$ 337.2	$ 278.1	$ 210.2
Earnings (loss) per share attributable to UGI stockholders:
Basic (in dollars per share)	$ (0.11)	$ 0.12	$ 1.24	$ 0.71	[1]	$ (0.08)	[2]	$ 0.05	$ 1.06	$ 0.60	$ 1.95	$ 1.63	$ 1.24
Diluted (in dollars per share)	$ (0.11)	$ 0.12	$ 1.22	$ 0.70	[1]	$ (0.08)	[2]	$ 0.05	$ 1.05	$ 0.60	$ 1.92	$ 1.60	$ 1.24

[1] 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).

[2] Includes impairment loss on private equity partnership investment which increased operating loss by $6.3 and net loss attributable to UGI Corporation by $3.7 or $0.02 per share (see Note 2).