Quarterly Data (Unaudited) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended														12 Months Ended
	Sep. 30, 2012		Jun. 30, 2012	Mar. 31, 2012		Dec. 31, 2011		Sep. 30, 2011		Jun. 30, 2011	Mar. 31, 2011		Dec. 31, 2010		Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Quarterly Financial Data [Abstract]
Revenues	$ 1,125.7	[1]	$ 1,277.2	$ 2,427.5	[2]	$ 1,688.8	[3]	$ 1,039.3	[1]	$ 1,105.4	$ 2,181.0	[4]	$ 1,765.6	[5]	$ 6,519.2	$ 6,091.3	$ 5,591.4
Operating income (loss)	(28.6)	[1]	(19.2)	380.8	[2]	188.3	[3]	(10.5)	[1]	17.2	357.0	[4]	252.3	[5]	521.3	616.0	659.2
Loss from equity investees	(0.1)	[1]	(0.1)	0	[2]	(0.1)	[3]	(0.1)	[1]	(0.2)	(0.4)	[4]	(0.2)	[5]	(0.3)	(0.9)	(2.1)
(Loss) gain on extinguishments of debt	0	[1]	0.1	(13.4)	[2]	0	[3]	(19.3)	[1]	0	(18.8)	[4]	0	[5]	(13.3)	(38.1)
Net income (loss)	(74.0)	[1]	(76.5)	227.0	[2]	110.1	[3]	(48.9)	[1]	(13.5)	215.6	[4]	155.0	[5]	186.6	308.2	355.7
Net income (loss) attributable to UGI Corporation	$ (14.7)	[1]	$ (6.3)	$ 133.4	[2]	$ 87.0	[3]	$ (22.4)	[1]	$ (7.2)	$ 149.4	[4]	$ 113.1	[5]	$ 199.4	$ 232.9	$ 261.0
Earnings (loss) per share attributable to UGI Corporation stockholders:
Basic (in dollars per share)	$ (0.13)	[1]	$ (0.06)	$ 1.19	[2]	$ 0.78	[3]	$ (0.20)	[1]	$ (0.06)	$ 1.34	[4]	$ 1.02	[5]	$ 1.77	$ 2.09	$ 2.38
Diluted (in dollars per share)	$ (0.13)	[1]	$ (0.06)	$ 1.18	[2]	$ 0.77	[3]	$ (0.20)	[1]	$ (0.06)	$ 1.32	[4]	$ 1.01	[5]	$ 1.76	$ 2.06	$ 2.36

[1] Includes loss on extinguishment of Partnership long-term debt which increased net loss attributable to UGI Corporation by $5.2 or $0.05 per diluted share (see Note 5).

[2] Includes loss on extinguishment of Partnership long-term debt which decreased net income attributable to UGI Corporation by $2.2 or $0.02 per diluted share (see Note 5).

[3] Includes adjustment to foreign tax credit valuation allowance which increased net income by $5.5 or $0.05 per diluted share.

[4] Includes loss on extinguishment of Partnership long-term debt which decreased net income attributable to UGI Corporation by $5.2 or $0.05 per diluted share (see Note 5).

[5] Includes the reversal of previously recorded nontaxable accrual associated with the Antargaz Competition Authority Matter which increased operating income and net income attributable to UGI Corporation by $9.4 or $0.08 per diluted share (see Note 15).