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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, 2019 | Sep. 30, 2018
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Regulatory Assets [Line Items] |  |
Regulatory assets | $ 3.7 | $ 6.3
UGI Utilities |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 395.6 | 301.0
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 358.8 | 390.2
UGI Utilities | Postretirement benefit overcollections |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 14.5 | 17.8
UGI Utilities | Deferred fuel and power refunds |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 6.1 | 36.7
UGI Utilities | State income tax benefits — distribution system repairs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 25.0 | 22.6
UGI Utilities | PAPUC Temporary Rates Order |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 31.3 | 24.4
UGI Utilities | Excess federal deferred income taxes |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 279.5 | 285.2
UGI Utilities | Other |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 2.4 | 3.5
UGI Utilities | Income taxes recoverable |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 115.2 | 110.1
UGI Utilities | Underfunded pension and postretirement plans |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 178.6 | 87.1
UGI Utilities | Environmental costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 59.5 | 58.8
UGI Utilities | Removal costs, net |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 28.3 | 32.0
UGI Utilities | Other |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | $ 14.0 | $ 13.0

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