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Utility Regulatory Assets and Liabilities and Regulatory Matters - Narrative (Details) - USD ($) $ in Millions |  |  |  |  |  |  |  |  |  | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 28, 2019 | Dec. 31, 2018 | Oct. 27, 2018 | Oct. 25, 2018 | May 17, 2018 | Jan. 26, 2018 | Oct. 20, 2017 | Jul. 02, 2017 | Jan. 19, 2017 | Jun. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2017
UGI South |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |
PUC temporary rates order, percent of reduction in base rate revenues |  |  |  |  | 5.78% |  |  |  |  |  |  |
UGI Utilities |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, civil penalties |  |  |  |  |  |  |  | $ 2.1 |  |  |  |
UGI North |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |
PUC temporary rates order, percent of reduction in base rate revenues |  |  |  |  | 3.90% |  |  |  |  |  |  |
UGI Central |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |
PUC temporary rates order, percent of reduction in base rate revenues |  |  |  |  | 8.19% |  |  |  |  |  |  |
Pennsylvania Public Utility Commission | UGI Gas |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, tax benefits received |  |  |  |  |  |  |  |  |  | $ 26.2 |  |
Pennsylvania Public Utility Commission | Electric Utility |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, requested rate increase (decrease), amount |  | $ 7.7 |  | $ 3.2 |  |  |  |  |  |  |  |
Public utilities, requested increase in annual base distribution revenues |  |  |  |  |  | $ 9.2 |  |  |  |  |  |
Public utilities, customer billing credit |  |  | $ 0.2 |  |  |  |  |  |  |  |  |
Pennsylvania Public Utility Commission | PNG |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, requested rate increase (decrease), amount |  |  |  |  |  |  |  |  | $ 21.7 |  |  |
Public utilities, approved rate increase (decrease), amount |  |  |  |  |  |  | $ 11.3 |  |  |  |  |
Gas Utility |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |
Fair value of unrealized gains (losses) |  | $ 0.8 |  |  |  |  |  |  |  |  | $ 2.9 | $ (1.7)
Subsequent Event | Pennsylvania Public Utility Commission | UGI Gas |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, requested rate increase (decrease), amount | $ 71.1 |  |  |  |  |  |  |  |  |  |  |
Public utilities, proposed negative surcharge in customer distribution service bills | 4.50% |  |  |  |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |
Average remaining depreciable lives of associated property |  |  |  |  |  |  |  |  |  |  | 1 year |
Maximum |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |
Average remaining depreciable lives of associated property |  |  |  |  |  |  |  |  |  |  | 65 years |

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