Debt (AmeriGas Propane) (Narrative) (Details) (USD $)	3 Months Ended														12 Months Ended					1 Months Ended	12 Months Ended		0 Months Ended	1 Months Ended	12 Months Ended		1 Months Ended		3 Months Ended	1 Months Ended	12 Months Ended	1 Months Ended	3 Months Ended	12 Months Ended						12 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	Sep. 30, 2012 Amerigas Partners Senior Notes Due 2020 [Member]	Jan. 12, 2012 Amerigas Partners Senior Notes Due 2020 [Member]	Jun. 30, 2012 Amerigas Partners Senior Notes Due 2022 [Member]	Sep. 30, 2012 Amerigas Partners Senior Notes Due 2022 [Member]	Jan. 12, 2012 Amerigas Partners Senior Notes Due 2022 [Member]	Mar. 28, 2012 6.50% Senior Note Due May 2021 [Member]	Jan. 31, 2011 6.50% Senior Note Due May 2021 [Member]	Sep. 30, 2011 6.50% Senior Note Due May 2021 [Member]	Jan. 12, 2012 6.50% Senior Note Due May 2021 [Member]	Feb. 28, 2011 7.25%, Due, May 2015 [Member]	Feb. 28, 2011 8.875%, Due May 2011 [Member]	Mar. 31, 2011 8.875%, Due May 2011 [Member]	Aug. 31, 2011 6.25%, Due August 2019 [Member]	Sep. 30, 2011 6.25%, Due August 2019 [Member]	Aug. 31, 2011 7.125%, Due May 2016 [Member]	Sep. 30, 2011 7.125%, Due May 2016 [Member]	Sep. 30, 2012 AmeriGas 2011 Credit Agreement [Member]	Sep. 30, 2011 AmeriGas 2011 Credit Agreement [Member]	Jun. 30, 2011 AmeriGas 2011 Credit Agreement [Member]	Jun. 30, 2011 AmeriGas 2011 Credit Agreement [Member] Letter of Credit [Member]	Sep. 30, 2012 Amended AmeriGas 2011 Credit Agreement [Member]	Sep. 30, 2011 Ameri Gas Predecessor Credit Agreement [Member]	Sep. 30, 2011 Minimum [Member] AmeriGas 2011 Credit Agreement [Member]	Sep. 30, 2011 Maximum [Member] AmeriGas 2011 Credit Agreement [Member]	Sep. 30, 2012 Amerigas Propane [Member]	Sep. 30, 2011 Amerigas Propane [Member]	Sep. 30, 2010 Amerigas Propane [Member]	Sep. 30, 2012 Amerigas Propane [Member] 6.25%, Due August 2019 [Member]	Sep. 30, 2011 Amerigas Propane [Member] 6.25%, Due August 2019 [Member]	Sep. 30, 2012 Amerigas Propane [Member] Heritage Propane Debt [Member]	Sep. 30, 2012 Amerigas Propane [Member] HOLP Senior Secured Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount																			$ 550,000,000			$ 1,000,000,000
Percentage senior notes due (as a percent)																			6.75%			7.00%				6.50%	7.25%	8.875%		6.25%		7.125%													6.25%
Guaranteed Debt	1,500,000,000														1,500,000,000
Percentage of Redemption at Option																		35.00%							35.00%						35.00%
Debt Tendered for Redemption																							383,500,000
Percentage of Aggregate Amount Outstanding Tendered																							82.00%
Principal amount outstanding before redemption																							470,000,000
Proceeds from issuance of senior notes																								470,000,000						450,000,000
Redemption Value of Senior Notes																										200,000,000
Early Redemption Percentage of Senior Notes																							105.00%
Percentage of proration factor (as a percent)																							52.30%
Repayments of Long-term Debt															299,900,000	1,383,600,000	94,800,000			19,200,000
Repayments of Senior Debt																											415,000,000	14,600,000				350,000,000
Loss on extinguishments of debt	0	[1]	100,000	(13,400,000)	[2]	0	[3]	(19,300,000)	[1]	0	(18,800,000)	[4]	0	[5]	(13,300,000)	(38,100,000)					(13,300,000)								(18,800,000)				(19,300,000)									(13,300,000)	(38,100,000)
Reduction in net income attributable to UGI Corporation due to extinguishment loss															2,200,000	5,200,000
Long-term Debt	3,514,300,000							2,157,700,000							3,514,300,000	2,157,700,000																										2,328,000,000	933,500,000		450,000,000	450,000,000	62,500,000	55,600,000
Unamortized Premium																																																4,400,000
Interest Rate, Stated Percentage Rate Range, Minimum																																																7.26%
Interest Rate, Stated Percentage Rate Range, Maximum																																																8.87%
Effective interest rate																																																6.75%
Credit agreement																																				325,000,000		525,000,000
Rate of Interest above Federal Fund Rate																																		0.50%
Revolving credit agreement sublimit for letters of credit																																					100,000,000
Margin on Credit Agreement Base Rate Borrowings																																								0.75%	1.75%
Margin on credit agreement Eurodollar rate borrowings																																								1.75%	2.75%
Credit Agreement Facility Fee Rate																																								0.30%	0.50%
Borrowings outstanding, amount																																		49,900,000					95,500,000
Line of Credit Facility, Interest Rate at Period End																																		2.72%	2.29%
Credit agreement outstanding, amount																																		$ 47,900,000					$ 35,700,000

[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).