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Utility Regulatory Assets and Liabilities and Regulatory Matters - Regulatory Assets and Liabilities Associated with Utilities (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Sep. 30, 2017
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Regulatory Assets [Line Items] |  |
Regulatory assets | $ 6.3 |
UGI Utilities |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 301.0 | $ 368.9
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 390.2 | 49.2
UGI Utilities | Postretirement benefit overcollections |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 17.8 | 17.5
UGI Utilities | Deferred fuel and power refunds |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 36.7 | 10.6
UGI Utilities | State income tax benefits — distribution system repairs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 22.6 | 18.4
UGI Utilities | PUC Temporary Rates Order |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 24.4 | 0.0
UGI Utilities | Excess Federal Deferred Income Taxes |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 285.2 | 0.0
UGI Utilities | Other |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 3.5 | 2.7
UGI Utilities | Income taxes recoverable |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 110.1 | 121.4
UGI Utilities | Underfunded pension and postretirement plans |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 87.1 | 141.3
UGI Utilities | Environmental costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 58.8 | 61.6
UGI Utilities | Deferred fuel and power costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 0.0 | 7.7
UGI Utilities | Removal costs, net |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 32.0 | 31.0
UGI Utilities | Other |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | $ 13.0 | $ 5.9

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