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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, 2018 | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Regulatory Assets |  |  |
Regulatory assets | $ 298.8 | $ 301.0 | $ 362.8
Regulatory Liabilities |  |  |
Regulatory liabilities | 373.5 | 390.2 | 357.5
Postretirement benefits |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 17.3 | 17.8 | 17.3
Deferred fuel and power refunds |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 22.2 | 36.7 | 12.7
State tax benefits — distribution system repairs |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 23.5 | 22.6 | 19.1
PAPUC temporary rates order |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 24.8 | 24.4 | 0.0
Excess federal deferred income taxes |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 280.9 | 285.2 | 303.9
Other |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 4.8 | 3.5 | 4.5
Income taxes recoverable |  |  |
Regulatory Assets |  |  |
Regulatory assets | 115.2 | 110.1 | 126.5
Underfunded pension and postretirement plans |  |  |
Regulatory Assets |  |  |
Regulatory assets | 85.3 | 87.1 | 138.3
Environmental costs |  |  |
Regulatory Assets |  |  |
Regulatory assets | 58.5 | 58.8 | 60.8
Removal costs, net |  |  |
Regulatory Assets |  |  |
Regulatory assets | 31.3 | 32.0 | 31.4
Other |  |  |
Regulatory Assets |  |  |
Regulatory assets | $ 8.5 | $ 13.0 | $ 5.8

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