Debt (Details Textual) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended				0 Months Ended	9 Months Ended	0 Months Ended	9 Months Ended			9 Months Ended
	Jun. 30, 2012 USD ($)	Jun. 30, 2012 USD ($)	Jun. 30, 2011 USD ($)	Jun. 30, 2012 AmeriGas Partners Senior Notes Due 2020 [Member]	Jan. 12, 2012 AmeriGas Partners Senior Notes Due 2020 [Member] USD ($)	Jan. 12, 2012 AmeriGas Partners Senior Notes Due 2022 [Member] USD ($)	Jun. 30, 2012 AmeriGas Partners Senior Notes Due 2022 [Member]	Mar. 28, 2012 Senior Note Due 2021 [Member] USD ($)	Jun. 30, 2012 Senior Note Due 2021 [Member]	Jun. 30, 2012 Flaga [Member]	Dec. 31, 2011 Flaga [Member] EUR (€)	Jun. 30, 2012 Flaga [Member] Maximum [Member]	Jun. 30, 2012 Flaga [Member] Minimum [Member]
Debt (Textual) [Abstract]
Carrying value long-term debt	$ 3,561.2	$ 3,561.2	$ 2,078.0								€ 19.1
Term loan interest rate description										The term loan matures in October 2016 and bears interest at three-month euribor rates plus a margin.
Margin on term loan base rate borrowings (as a percent)												2.525%	1.175%
Effective underlying EURIBOR rate of interest on term loan (as a percent)										1.79%
Effective interest rate on term loan (as a percent)										3.85%
Aggregate principal amount					550	1,000
Debt tendered for redemption								383.5
Percentage senior notes due (as a percent)				6.75%			7.00%		6.50%
Debt repayment date (in year of repayment)				May 01, 2020			May 01, 2022		May 01, 2021
Redemption percentage of senior notes (as a percent)								105.00%
Percentage of proration factor (as a percent)								52.30%
Percentage of aggregate amount outstanding tendered (as a percent)								82.00%
Early Redemption percentage of senior notes equity offering (as a percent)				35.00%		35.00%
Principal amount outstanding before redemption								470
Loss on extinguishment of debt								(13.4)
Redeem amount of net proceeds from issue of share and capital contribution								200
Repayments of Long-term Debt	$ 19.2	$ 240.1	$ 987.3