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Utility Regulatory Assets and Liabilities and Regulatory Matters - Narrative (Details) - USD ($) $ in Millions | Jan. 28, 2020 | Oct. 11, 2019 | Jan. 28, 2019 | Oct. 27, 2018 | Oct. 25, 2018 | Mar. 31, 2020 | Sep. 30, 2019 | Mar. 31, 2019
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Pennsylvania Public Utility Commission | UGI Gas |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |
Public utilities, requested rate increase (decrease), amount | $ 74.6 |  | $ 71.1 |  |  |  |  |
Public utilities, approved rate increase (decrease), amount |  | $ 30.0 |  |  |  |  |  |
Tax benefit to be returned |  |  | $ 24.0 |  |  |  |  |
Energy Efficiency and Conservation and Growth extension tariff, extension term |  | 5 years |  |  |  |  |  |
Pennsylvania Public Utility Commission | Electric Utility |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |
Public utilities, requested rate increase (decrease), amount |  |  |  |  | $ 3.2 |  |  |
Public utilities, customer billing credit |  |  |  | $ 0.2 |  |  |  |
Gas Utility |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |
Fair value of unrealized gains (losses) |  |  |  |  |  | $ (0.5) | $ (2.2) | $ 1.0

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