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Income Taxes - Narrative (Details) - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Dec. 22, 2017 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2018 | Sep. 30, 2021 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |
Foreign tax credits |  |  |  |  |  |  | $ 13.0 | $ 40.9 | $ 25.6 |
Income Taxes |  |  |  |  |  |  |  |  |  |
Tax Cuts And Jobs Act Of 2017, incomplete accounting, change in tax rate, deferred tax liability, provisional income tax benefit, including unrecognized deferred tax liability | $ 384.4 |  |  |  |  |  |  |  |  |
Effective income tax rate reconciliation, at federal statutory income tax rate, percent |  |  |  |  |  |  | 24.50% | 35.00% | 35.00% |
Deferred tax benefit |  |  |  |  |  |  | $ 52.1 | $ (0.6) |  |
Tax Cuts And Jobs Act Of 2017, incomplete accounting, change in tax rate, provisional unrecognized deferred tax liability |  |  |  |  |  |  | 205.6 |  |  |
Increase (decrease) in regulatory liabilities, excess deferred income taxes |  |  |  |  |  |  | 83.6 |  |  |
Income tax expense (benefit), continuing operations, adjustment of deferred tax (asset) liability |  | $ (12.1) |  |  |  |  |  |  |  |
Deferred tax assets relating to operating loss carryforwards |  |  | $ 30.9 |  |  |  | 26.2 | 30.9 |  |
Increase (decrease) in valuation allowance |  |  |  |  |  |  | 9.7 |  |  |
Credits to expire before utilization |  |  | 98.5 |  |  |  |  | 98.5 |  |
Unrecognized income tax benefits |  |  | 12.2 |  |  |  | 11.5 | $ 12.2 | $ 7.2 | $ 3.2
Accrued interest included in unrecognized income tax benefits |  |  |  |  |  |  | 1.0 |  |  |
Unrecognized tax benefits if recognized would impact the reported effective tax rate |  |  |  |  |  |  | $ 11.5 |  |  |
Corporate income tax rate |  |  |  |  |  |  | 3.80% | 25.30% | 31.20% |
Accrued Interest Included |  |  |  |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |  |  |  |
Unrecognized income tax benefits |  |  |  |  |  |  | $ 11.5 |  |  |
Future Utilization of Foreign Tax Credits |  |  |  |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |  |  |  |
Increase (decrease) in valuation allowance |  |  |  |  |  |  | 7.6 | $ 7.6 |  |
Foreign Operating Loss Carryforwards |  |  |  |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |  |  |  |
Increase (decrease) in valuation allowance |  |  |  |  |  |  | 2.1 |  |  |
UGI Utilities |  |  |  |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |  |  |  |
PUC temporary rates order, reduction in revenue |  |  |  |  | $ 24.1 |  | 24.1 |  |  |
Flaga |  |  |  |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |  |  |  |
Deferred tax assets relating to operating loss carryforwards |  |  |  |  |  |  | 2.9 |  |  |
UGI International Holdings BV |  |  |  |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |  |  |  |
Deferred tax assets relating to operating loss carryforwards |  |  |  |  |  |  | 0.7 |  |  |
UGI France |  |  |  |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |  |  |  |
Deferred tax assets relating to operating loss carryforwards |  |  |  |  |  |  | 8.0 |  |  |
AmeriGas Propane |  |  |  |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |  |  |  |
Operating loss carryforwards |  |  |  |  |  |  | 19.7 |  |  |
Deferred tax assets relating to operating loss carryforwards |  |  |  |  |  |  | 4.0 |  |  |
Other Subsidiaries |  |  |  |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |  |  |  |
Deferred tax assets relating to operating loss carryforwards |  |  |  |  |  |  | 10.6 |  |  |
UGI International |  |  |  |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |  |  |  |
Valuation allowance operating loss carryforwards |  |  |  |  |  |  | 9.6 |  |  |
French Parliament |  |  |  |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |  |  |  |
Deferred tax benefit |  |  | 1.6 | $ 27.4 |  |  | $ 29.0 |  |  |
Corporate income tax rate |  |  |  |  |  |  | 34.43% |  |  |
French Parliament | Forecast |  |  |  |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |  |  |  |
Corporate income tax rate |  |  |  |  |  | 28.92% |  |  |  |
State |  |  |  |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |  |  |  |
Decrease in income tax expense due to state tax flow through of accelerated depreciation |  |  |  |  |  |  | $ 4.2 | 2.5 | $ 1.3 |
Operating loss carryforwards |  |  |  |  |  |  | 168.9 |  |  |
Foreign |  |  |  |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |  |  |  |
Foreign tax credit carryforwards |  |  | $ 106.1 |  |  |  |  | $ 106.1 |  |
Foreign | Flaga |  |  |  |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |  |  |  |
Operating loss carryforwards |  |  |  |  |  |  | 14.0 |  |  |
Foreign | UGI International Holdings BV |  |  |  |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |  |  |  |
Operating loss carryforwards |  |  |  |  |  |  | 2.5 |  |  |
Foreign | UGI France |  |  |  |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |  |  |  |
Operating loss carryforwards |  |  |  |  |  |  | 23.3 |  |  |
Income Tax Benefits | UGI Utilities |  |  |  |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |  |  |  |
PUC temporary rates order, reduction in revenue |  |  |  |  | 17.1 |  |  |  |  |
Future Amortization Of Regulatory Liabilities | UGI Utilities |  |  |  |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |  |  |  |
PUC temporary rates order, reduction in revenue |  |  |  |  | $ 7.0 |  | $ 7.0 |  |  |

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