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Utility Regulatory Assets and Liabilities and Regulatory Matters - Regulatory Assets and Liabilities Associated with Utilities (Details) - UGI Utilities - USD ($) $ in Millions | Sep. 30, 2017 | Sep. 30, 2016
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Regulatory Assets [Line Items] |  |
Regulatory assets | $ 368.9 | $ 395.1
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 49.2 | 55.6
Postretirement benefit overcollections |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 17.5 | 17.5
Deferred fuel and power refunds |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 10.6 | 22.3
State income tax benefits — distribution system repairs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 18.4 | 15.1
Other |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 2.7 | 0.7
Income taxes recoverable |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 121.4 | 115.7
Underfunded pension and postretirement plans |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 141.3 | 183.1
Environmental costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 61.6 | 59.4
Deferred fuel and power costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 7.7 | 0.2
Removal costs, net |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 31.0 | 27.9
Other |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | $ 5.9 | $ 8.8

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