Segment Information - Reconciliation of Partnership Adjusted EBITDA (Details) - USD ($) $ in Millions		3 Months Ended			9 Months Ended
		Jun. 30, 2016	Jun. 30, 2015		Jun. 30, 2016	Jun. 30, 2015
Segment Reporting Information
Depreciation and amortization		$ (98.1)	$ (92.5)	[1]	$ (299.4)	$ (271.5)	[1]
Interest expense		(56.4)	(67.5)	[1]	(171.6)	(184.7)	[1]
Loss on extinguishments of debt		(37.1)	0.0		(37.1)	0.0
Income (loss) before income taxes		$ 62.2	$ (11.4)	[1]	$ 867.8	$ 655.7	[1]
General Partnership interest in AmeriGas OLP (percentage)		1.01%	1.01%		1.01%	1.01%
Amerigas Propane
Segment Reporting Information
Partnership Adjusted EBITDA		$ 64.6	$ 48.9		$ 537.7	$ 579.5
Depreciation and amortization		(46.4)	(48.0)		(143.0)	(145.5)
Interest expense		(40.9)	(40.3)		(122.7)	(122.4)
Loss on extinguishments of debt		(37.1)	0.0		(37.1)	0.0
Noncontrolling interests	[2]	0.1	(0.1)		3.6	3.4
Income (loss) before income taxes		(59.7)	(39.5)		238.5	315.0
Operating Segments | Amerigas Propane
Segment Reporting Information
Partnership Adjusted EBITDA	[3]	64.6	48.9	[1]	537.7	579.5	[1]
Depreciation and amortization		(46.4)	(48.0)	[1]	(143.0)	(145.5)	[1]
Interest expense		(40.9)	(40.3)	[1]	(122.7)	(122.4)	[1]
Loss on extinguishments of debt		(37.1)			(37.1)
Income (loss) before income taxes		$ (59.7)	$ (39.5)	[1]	$ 238.5	$ 315.0	[1]

[1] Certain amounts have been restated to reflect the current-year changes in our segment presentation as described above.

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

[3] The following table provides a reconciliation of Partnership Adjusted EBITDA to AmeriGas Propane (loss) income before income taxes: Three Months EndedJune 30, Nine Months EndedJune 30, 2016 2015 2016 2015Partnership Adjusted EBITDA $64.6 $48.9 $537.7 $579.5Depreciation and amortization (46.4) (48.0) (143.0) (145.5)Interest expense (40.9) (40.3) (122.7) (122.4)Loss on extinguishments of debt (37.1) — (37.1) —Noncontrolling interests (i) 0.1 (0.1) 3.6 3.4(Loss) income before income taxes $(59.7) $(39.5) $238.5 $315.0(i)Principally represents the General Partner’s 1.01% interest in AmeriGas OLP.