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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2021 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Income Tax Disclosure [Abstract] |  |  |  |  |  |
Foreign tax credits |  |  | $ 40.9 | $ 25.6 | $ 63.0 |
Undistributed earnings of foreign subsidiaries | $ 119.7 |  | $ 119.7 |  |  |
Income Taxes |  |  |  |  |  |
Corporate income tax rate |  |  | 25.30% | 31.20% | 30.00% |
Deferred tax assets relating to operating loss carryforwards | 30.9 |  | $ 30.9 | $ 31.5 |  |
Increase (decrease) in valuation allowance | 7.6 |  | (7.2) |  |  |
Valuation allowance provided for deferred tax assets related to state net operating loss carryforwards and other state deferred tax assets of certain subsidiaries | 0.2 |  | 0.2 |  |  |
Credits to expire before utilization | 98.5 |  | 98.5 |  |  |
Unrecognized income tax benefits | 12.2 |  | 12.2 | 7.2 | $ 3.2 | $ 2.4
Accrued interest included in unrecognized income tax benefits | 0.5 |  | 0.5 |  |  |
Unrecognized tax benefits if recognized would impact the reported effective tax rate | 8.1 |  | 8.1 |  |  |
Accrued Interest Included |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Unrecognized income tax benefits | 12.2 |  | 12.2 |  |  |
Future Utilization of Foreign Tax Credits |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Increase (decrease) in valuation allowance |  |  | (7.6) |  |  |
Foreign Operating Loss Carryforwards |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Increase (decrease) in valuation allowance |  |  | (1.5) |  |  |
Foreign Tax Credits |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Increase (decrease) in valuation allowance |  |  | 1.1 |  |  |
State Capital Loss Carryforwards |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Increase (decrease) in valuation allowance |  |  | 0.8 |  |  |
State Operating Loss Carryforwards |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Increase (decrease) in valuation allowance |  |  |  | (5.5) |  |
Flaga |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Deferred tax assets relating to operating loss carryforwards | 5.6 |  | 5.6 |  |  |
UGI International Holdings BV |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Deferred tax assets relating to operating loss carryforwards | 0.7 |  | 0.7 |  |  |
UGI France |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Deferred tax assets relating to operating loss carryforwards | 7.8 |  | 7.8 |  |  |
AmeriGas Propane |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Operating loss carryforwards | 19.7 |  | 19.7 |  |  |
Deferred tax assets relating to operating loss carryforwards | 6.8 |  | 6.8 |  |  |
Other Subsidiaries |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Deferred tax assets relating to operating loss carryforwards | 10.0 |  | 10.0 |  |  |
UGI International |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Valuation allowance operating loss carryforwards | 7.5 |  | $ 7.5 |  |  |
French Parliament |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Corporate income tax rate |  |  | 34.43% |  |  |
Deferred tax benefit |  |  | $ 29.0 |  |  |
French Parliament | Forecast |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Corporate income tax rate |  | 28.92% |  |  |  |
State |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Operating loss carryforwards | 187.9 |  | 187.9 |  |  |
Decrease in income tax expense due to state tax flow through of accelerated depreciation |  |  | 2.5 | 1.3 | $ 1.5 |
Deferred tax assets and associated valuation allowance for unrealized state tax benefits for equity compensation deductions |  |  |  | $ 7.7 |  |
Foreign |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Foreign tax credit carryforwards | 106.1 |  | 106.1 |  |  |
Foreign | Flaga |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Operating loss carryforwards | 24.5 |  | 24.5 |  |  |
Foreign | UGI International Holdings BV |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Operating loss carryforwards | 2.5 |  | 2.5 |  |  |
Foreign | UGI France |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Operating loss carryforwards | $ 22.6 |  | $ 22.6 |  |  |

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