Condensed Financial Information of Registrant (Parent Company) (Details 1) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2009	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Condensed Financial Statements, Captions [Line Items]
Revenues	$ 1,039.3	$ 1,105.4	$ 2,181.0	$ 1,765.6	$ 890.4	$ 961.9	$ 2,120.3	$ 1,618.8	$ 6,091.3	$ 5,591.4	$ 5,737.8
Costs and Expenses
Operating and administrative expenses									1,266.4	1,177.4	1,220.0
Other income, net									(46.5)	(58.0)	(55.9)
Total costs and expenses									5,475.3	4,932.2	5,052.5
Operating (loss) income	(10.5)	17.2	357.0	252.3	18.8	31.2	366.0	243.2	616.0	659.2	685.3
Income tax (benefit) expense									130.8	167.6	159.1
Equity in income of unconsolidated subsidiaries	(0.1)	(0.2)	(0.4)	(0.2)	(0.2)	(1.9)			(0.9)	(2.1)	(3.1)
Net income attributable to UGI Corporation	(22.4)	(7.2)	149.4	113.1	2.1	3.4	157.1	98.4	232.9	261.0	258.5
Earnings per common share:
Basic	$ (0.20)	$ (0.06)	$ 1.34	$ 1.02	$ 0.02	$ 0.03	$ 1.44	$ 0.90	$ 2.09	$ 2.38	$ 2.38
Diluted	$ (0.20)	$ (0.06)	$ 1.32	$ 1.01	$ 0.02	$ 0.03	$ 1.43	$ 0.90	$ 2.06	$ 2.36	$ 2.36
Average common shares outstanding (thousands):
Basic									111,674	109,588	108,523
Diluted									112,944	110,511	109,339
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues
Costs and Expenses
Operating and administrative expenses									31.0	31.8	33.7
Other income, net									(24.8)	(31.7)	(33.7)
Total costs and expenses									6.2	0.1
Operating (loss) income									(6.2)	(0.1)
Intercompany interest income									0.1		0.1
Loss (income) before income taxes									(6.1)	(0.1)	0.1
Income tax (benefit) expense									(1.1)	0.7	0.8
Loss before equity in income of unconsolidated subsidiaries									(5.0)	(0.8)	(0.7)
Equity in income of unconsolidated subsidiaries									237.9	261.8	259.2
Net income attributable to UGI Corporation									$ 232.9	$ 261.0	$ 258.5
Earnings per common share:
Basic									$ 2.09	$ 2.38	$ 2.38
Diluted									$ 2.06	$ 2.36	$ 2.36
Average common shares outstanding (thousands):
Basic									111,674	109,588	108,523
Diluted									112,944	110,511	109,339