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, 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
Condensed Financial Statements, Captions [Line Items]
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
Costs and expenses:
Operating and administrative expenses															1,591.7		1,266.4		1,177.4
Other income, net															(38.3)		(46.5)		(58.0)
Total costs and expenses															5,997.9		5,475.3		4,932.2
Operating 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
Income tax expense (benefit)															99.6		130.8		167.6
Equity in income of unconsolidated subsidiaries	(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)
Net income 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 per common share:
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
Average common shares outstanding (thousands):
Basic (in shares)															112,581	[6]	111,674	[6]	109,588
Diluted (in shares)															113,432	[6]	112,944	[6]	110,511
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues															0		0		0
Costs and expenses:
Operating and administrative expenses															27.8		31.0		31.8
Other income, net															(28.1)	[7]	(24.8)	[7]	(31.7)	[7]
Total costs and expenses															(0.3)		6.2		0.1
Operating loss															0.3		(6.2)		(0.1)
Intercompany interest income															0.2		0.1		0
Income (loss) before income taxes															0.5		(6.1)		(0.1)
Income tax expense (benefit)															0.3		(1.1)		0.7
Income (loss) before equity in income of unconsolidated subsidiaries															0.2		(5.0)		(0.8)
Equity in income of unconsolidated subsidiaries															199.2		237.9		261.8
Net income attributable to UGI Corporation															$ 199.4		$ 232.9		$ 261.0
Earnings per common share:
Basic (in dollars per share)															$ 1.77		$ 2.09		$ 2.38
Diluted (in dollars per share)															$ 1.76		$ 2.06		$ 2.36
Average common shares outstanding (thousands):
Basic (in shares)															112,581		111,674		109,588
Diluted (in shares)															113,432		112,944		110,511

[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).

[6] For Fiscal 2012 and Fiscal 2011, there were approximately 81 shares and 3,700 shares, respectively, associated with outstanding stock option awards that were not included in the computation of diluted earnings per share because their effect was antidilutive.

[7] UGI provides certain financial and administrative services to certain of its subsidiaries. UGI bills these subsidiaries monthly for all direct expenses incurred by UGI on behalf of its subsidiaries as well as allocated shares of indirect corporate expense incurred or paid with respect to services provided by UGI. The allocation of indirect UGI corporate expenses to certain of its subsidiaries utilizes a weighted, three-component formula comprising revenues, operating expenses, and net assets employed and considers the relative percentage of such items for each subsidiary to the total of such items for all UGI operating subsidiaries for which general and administrative services are provided. Management believes that this allocation method is reasonable and equitable to its subsidiaries. These billed expenses are classified as “Other income, net” in the Statements of Income above.