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Common Stock and Equity-Based Compensation - AmeriGas Common Unit Based Awards in Common Units and Cash (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
AmeriGas Performance Unit awards
Share-based Compensation Arrangement by Share-based Payment Award
Number of Common Units subject to original awards granted (in shares)	52,495	65,525	53,800
Performance period beginning January 1:	2016	2015	2014
Payment of awards:
AmeriGas Partners Common Units issued, net of units withheld for taxes (in shares)	10,902	13,164	29,489
Cash paid	$ 0.8	$ 1.2	$ 2.9
AmeriGas Stock Unit awards
Share-based Compensation Arrangement by Share-based Payment Award
Number of Common Units subject to original awards granted (in shares)	20,585	14,811	32,658
Payment of awards:
AmeriGas Partners Common Units issued, net of units withheld for taxes (in shares)	9,706	5,322	3,932
Cash paid	$ 0.2	$ 0.1	$ 0.1

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