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Utility Regulatory Assets and Liabilities and Regulatory Matters (Details) - USD ($) $ in Millions | Jan. 19, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Dec. 31, 2014
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Gas Utility |  |  |  |
Regulatory Assets |  |  |  |
Fair value of unrealized gains (losses) |  | $ (4.5) | $ (3.3) | $ (6.8)
Electric Utility Electric Supply Contracts |  |  |  |
Regulatory Assets |  |  |  |
Fair value of unrealized gains (losses) |  | $ (0.5) | $ (0.5) | $ (2.4)
UGI Utilities | Pennsylvania Public Utility Commission | Subsequent Event |  |  |  |
Regulatory Assets |  |  |  |
Requested operating revenue increase | $ 58.6 |  |  |
Estimated time period for regulatory approval (in months) | 9 months |  |  |

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