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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, 2018 | Sep. 30, 2017 | Mar. 31, 2017
--- | --- | --- | ---
Regulatory Assets |  |  |
Regulatory assets | $ 361.6 | $ 368.9 | $ 394.7
Regulatory Liabilities |  |  |
Regulatory liabilities | 380.7 | 49.2 | 50.5
Postretirement benefits |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 17.1 | 17.5 | 17.0
Deferred fuel and power refunds |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 35.3 | 10.6 | 13.8
State tax benefits — distribution system repairs |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 19.9 | 18.4 | 16.1
Excess federal deferred income taxes |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 301.2 | 0.0 | 0.0
Other |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 7.2 | 2.7 | 3.6
Income taxes recoverable |  |  |
Regulatory Assets |  |  |
Regulatory assets | 128.3 | 121.4 | 120.3
Underfunded pension and postretirement plans |  |  |
Regulatory Assets |  |  |
Regulatory assets | 135.3 | 141.3 | 175.6
Environmental costs |  |  |
Regulatory Assets |  |  |
Regulatory assets | 59.8 | 61.6 | 62.2
Deferred fuel and power costs |  |  |
Regulatory Assets |  |  |
Regulatory assets | 0.7 | 7.7 | 1.3
Removal costs, net |  |  |
Regulatory Assets |  |  |
Regulatory assets | 30.5 | 31.0 | 28.8
Other |  |  |
Regulatory Assets |  |  |
Regulatory assets | $ 7.0 | $ 5.9 | $ 6.5

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