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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 | Mar. 31, 2019 | Sep. 30, 2018 | Mar. 31, 2018
--- | --- | --- | ---
Regulatory Assets |  |  |
Regulatory assets | $ 299.3 | $ 301.0 | $ 361.6
Regulatory Liabilities |  |  |
Regulatory liabilities | 379.5 | 390.2 | 380.7
Postretirement benefits |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 16.9 | 17.8 | 17.1
Deferred fuel and power refunds |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 17.7 | 36.7 | 35.3
State tax benefits — distribution system repairs |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 24.3 | 22.6 | 19.9
PAPUC temporary rates order |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 25.1 | 24.4 | 0.0
Excess federal deferred income taxes |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 276.7 | 285.2 | 301.2
Other |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 18.8 | 3.5 | 7.2
Income taxes recoverable |  |  |
Regulatory Assets |  |  |
Regulatory assets | 120.3 | 110.1 | 128.3
Underfunded pension and postretirement plans |  |  |
Regulatory Assets |  |  |
Regulatory assets | 83.6 | 87.1 | 135.3
Environmental costs |  |  |
Regulatory Assets |  |  |
Regulatory assets | 58.8 | 58.8 | 59.8
Removal costs, net |  |  |
Regulatory Assets |  |  |
Regulatory assets | 30.1 | 32.0 | 30.5
Other |  |  |
Regulatory Assets |  |  |
Regulatory assets | $ 6.5 | $ 13.0 | $ 7.7

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