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Utility Regulatory Assets and Liabilities and Regulatory Matters - Narrative (Details) - USD ($) $ in Millions |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 26, 2018 | Oct. 20, 2017 | Jul. 01, 2017 | Jan. 01, 2017 | Oct. 19, 2016 | Apr. 01, 2016 | Apr. 01, 2015 | Dec. 31, 2017 | Sep. 30, 2014 | Sep. 30, 2017 | Dec. 31, 2016
Minimum |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |
Average remaining depreciable lives of associated property. |  |  |  |  |  |  |  | 1 year |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |
Average remaining depreciable lives of associated property. |  |  |  |  |  |  |  | 65 years |  |  |
Pennsylvania Public Utility Commission |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |
DSIC, percent of amount billed to customers |  |  |  |  |  |  |  |  | 0.00% |  |
Pennsylvania Public Utility Commission | PNG |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |
Increase in annual base distribution rate |  | $ 11.3 |  |  |  |  |  |  |  |  |
DSIC, percent of amount billed to customers |  |  | 7.50% |  |  |  | 0.00% |  |  |  |
Pennsylvania Public Utility Commission | UGI Gas |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |
Increase in annual base distribution rate |  |  |  |  | $ 27.0 |  |  |  |  |  |
Pennsylvania Public Utility Commission | CPG |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |
DSIC, percent of amount billed to customers |  |  | 7.50% |  |  | 0.00% |  |  |  |  |
Pennsylvania Public Utility Commission | Maximum |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |
DSIC, percent of amount billed to customers |  |  |  | 5.00% |  |  |  |  |  |  |
Gas Utility |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |
Fair value of unrealized gains (losses) |  |  |  |  |  |  |  | $ (1.7) |  | $ 0.1 | $ 6.9
Forecast | Subsequent Event | Pennsylvania Public Utility Commission | Electric Utility |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |
Requested rate increase amount | $ 9.2 |  |  |  |  |  |  |  |  |  |

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