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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
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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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