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Partnership Acquisition of Heritage Propane (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended				3 Months Ended	9 Months Ended				0 Months Ended	12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 AmeriGas Partners Senior Notes Due 2020 [Member]	Jun. 30, 2012 AmeriGas Partners Senior Notes Due 2022 [Member]	Jun. 30, 2012 Heritage [Member]	Jun. 30, 2012 Heritage [Member]	Jan. 12, 2012 Heritage [Member]	Jan. 12, 2012 Titan [Member]	Jan. 12, 2012 Energy Transfer Partners, L.P. [Member] States	Jan. 12, 2012 Heritage Propane [Member]	Dec. 31, 2011 Heritage Propane [Member] Customer gal	Jan. 12, 2012 Heritage Propane [Member] AmeriGas Partners Senior Notes Due 2020 [Member]	Jan. 12, 2012 Heritage Propane [Member] AmeriGas Partners Senior Notes Due 2022 [Member]
Acquisition (Textual) [Abstract]
Purchase price of the acquisition										$ 2,598.2
Business acquired by parent through subsidiaries for cash					1,472.2	1,472.2				1,465.6
Common units issued by AmeriGas Partners (in units)										29,567,362
Consideration in AmeriGas Partners Common Units	1,132.6									1,132.6
Working capital adjustment, additional cash paid	25.5
Number of states in which business operates (in states)									41
Annual delivery of propane by subsidiary (in gallons)											500,000,000
Number of retail customer (in customers)											1,000,000
Percentage of Limited partner interest (as a percent)							99.999%	99.99%
Percentage of membership interest (as a percent)							100.00%	100.00%
Percentage of general partner interest (as a percent)								0.01%		0.001%
Number of common units contributed by Entity (in units)										934,327
Fair value of common stock										41.7
Percentage senior notes due (as a percent)			6.75%	7.00%								6.75%	7.00%
Proceeds from issuance of Senior notes	3,561.2	2,078.0										550.0	1,000.0
Maturity dates of Notes issued (in year of maturity)												2020	2022
Operating and administrative costs					0.5	5.3
Working capital adjustment and cash acquired										$ 60.7