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Utility Regulatory Assets and Liabilities and Regulatory Matters - Regulatory Assets and Liabilities Associated with Gas Utility and Electric Utility (Details) - UGI Utilities - USD ($) $ in Millions | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Regulatory Assets |  |  |
Regulatory assets | $ 362.8 | $ 368.9 | $ 392.9
Regulatory Liabilities |  |  |
Regulatory liabilities | 357.5 | 49.2 | 58.7
Postretirement benefits |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 17.3 | 17.5 | 17.3
Deferred fuel and power refunds |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 12.7 | 10.6 | 23.8
State tax benefits — distribution system repairs |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 19.1 | 18.4 | 15.6
Excess federal deferred income taxes |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 303.9 | 0.0 | 0.0
Other |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 4.5 | 2.7 | 2.0
Income taxes recoverable |  |  |
Regulatory Assets |  |  |
Regulatory assets | 126.5 | 121.4 | 117.8
Underfunded pension and postretirement plans |  |  |
Regulatory Assets |  |  |
Regulatory assets | 138.3 | 141.3 | 179.4
Environmental costs |  |  |
Regulatory Assets |  |  |
Regulatory assets | 60.8 | 61.6 | 61.4
Deferred fuel and power costs |  |  |
Regulatory Assets |  |  |
Regulatory assets | 0.1 | 7.7 | 0.0
Removal costs, net |  |  |
Regulatory Assets |  |  |
Regulatory assets | 31.4 | 31.0 | 27.1
Other |  |  |
Regulatory Assets |  |  |
Regulatory assets | $ 5.7 | $ 5.9 | $ 7.2

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