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Income Tax Reform - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2018 | Jun. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |
Reduction in net deferred income tax liabilities due to the remeasuring of existing federal deferred income tax assets and liabilities |  | $ 0.8 |  |  |  | $ 389.6 |  |  |
Regulatory liability, excess deferred federal income taxes due to tax reform |  |  |  | $ 216.1 |  |  |  |  |
Increase in regulatory liabilities for the tax effect of future revenue reductions |  |  |  | 87.8 |  |  |  |  |
Estimated deferred tax benefit resulting from future income tax reduction |  | 6.1 |  |  |  | 60.6 |  |  |
Foreign Tax Authority | French Parliament |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |
Effective income tax rate reconciliation, change in enacted tax rate, amount (excluding tax cuts and jobs act of 2017 Impact) |  | (0.2) |  |  |  |  | $ 4.7 |  |
Foreign Tax Authority | French Parliament | January 1, 2022 (Fiscal 2023) |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |
Income tax benefit, continuing operations, adjustment of deferred taxes |  | 0.1 | $ 3.7 | $ 17.3 |  | $ 13.5 |  |  |
Increase in per share, basic and diluted resulting from future income tax reduction (in dollars per share) |  |  |  |  |  | $ 0.08 |  |  |
Foreign Tax Authority | French Parliament | January 1, 2020 (Fiscal 2021) |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |
Income tax benefit, continuing operations, adjustment of deferred taxes |  |  |  |  | $ 27.4 |  |  |  |
Increase in per share, basic and diluted resulting from future income tax reduction (in dollars per share) |  |  |  |  | $ 0.15 |  |  |  |
Scenario, Forecast |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |
Effective income tax rate reconciliation, blended federal rate |  |  |  |  |  |  |  | 24.50% |
UGI Utilities |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |
PUC temporary rates order, reduction in revenue | $ 1.4 | 22.7 |  |  |  | $ 24.1 |  |  |
Regulatory assets |  | $ 360.1 |  |  |  | 360.1 | $ 398.8 |  | $ 368.9
Income Tax Benefits | UGI Utilities |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |
PUC temporary rates order, reduction in revenue |  |  |  |  |  | 17.1 |  |  |
Future Amortization Of Regulatory Liabilities | UGI Utilities |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |
PUC temporary rates order, reduction in revenue |  |  |  |  |  | $ 7.0 |  |  |

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