Segment Information - Reconciliation of Partnership Adjusted EBITDA (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information
Depreciation and amortization		$ (92.5)	$ (90.0)	$ (271.5)	$ (271.7)
Operating income		$ 56.1	$ 62.7	$ 841.5	$ 1,015.0
General Partnership interest in AmeriGas OLP (percentage)		1.01%	1.01%	1.01%	1.01%
Amerigas Propane
Segment Reporting Information
Partnership Adjusted EBITDA		$ 48.9	$ 55.1	$ 579.5	$ 616.5
Depreciation and amortization		(48.0)	(47.8)	(145.5)	(149.3)
Noncontrolling interests	[1]	(0.1)	(0.1)	3.4	4.5
Operating income		$ 0.8	$ 7.2	$ 437.4	$ 471.7

[1] Principally represents the General Partner’s 1.01% interest in AmeriGas OLP.