Segment Information (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011
Reconciliation of partnership EBITDA
Depreciation and amortization	$ (82.8)	$ (55.5)	$ (143.1)	$ (110.8)
Loss on extinguishment of debt	13.4	18.8	13.4	18.8
Operating income	380.8	357.0	569.1	609.3
AmeriGas Propane [Member]
Reconciliation of partnership EBITDA
Partnership EBITDA	224.5	157.5	308.2	270.8
Depreciation and amortization	(44.8)	(23.2)	(69.0)	(45.9)
Loss on extinguishment of debt	13.4	18.8	13.4	18.8
Noncontrolling interests	1.9	1.5	2.5	2.5
Operating income	$ 195.0	$ 154.6	$ 255.1	$ 246.2