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Income Taxes - Narrative (Details) - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Aug. 21, 2019 | Dec. 31, 2017 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Foreign tax credits |  |  |  |  |  |  |  | $ 9.8 | $ 13.0 | $ 40.9 |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  | 21.00% | 24.50% | 35.00% |
Increase (decrease) in income tax liabilities |  |  |  |  |  |  |  |  | $ (52.1) |  |
Tax Cuts And Jobs Act Of 2017, incomplete accounting, change in tax rate, provisional unrecognized deferred tax liability |  |  | $ 205.6 |  |  |  |  |  | 205.6 |  |
Increase (decrease) in regulatory liabilities, excess deferred income taxes |  |  |  |  |  |  |  |  | 83.6 |  |
Tax Cuts And Jobs Act of 2017, transition tax for accumulated foreign earnings, provisional Income tax expense (benefit) |  |  |  |  |  |  |  | $ 3.8 |  |  |
Income tax expense (benefit), continuing operations, adjustment of deferred tax (asset) liability |  | $ (12.1) |  |  |  |  |  | 2.4 |  |  |
Deferred tax assets relating to operating loss carryforwards |  |  | 26.2 |  |  |  |  | 21.2 | 26.2 |  |
Increase (decrease) in valuation allowance |  |  |  |  |  |  |  | (26.1) | 9.7 |  |
Unrecognized income tax benefits |  |  | 11.5 |  |  |  |  | 10.9 | 11.5 | $ 12.2 | $ 7.2
Accrued interest included in unrecognized income tax benefits |  |  |  |  |  |  |  | 1.0 |  |  |
Unrecognized tax benefits if recognized would impact the reported effective tax rate |  |  |  |  |  |  |  | 10.9 |  |  |
Expected change in unrecognized tax benefits |  |  |  |  |  |  |  | 2.8 |  |  |
Accrued Interest Included |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unrecognized income tax benefits |  |  |  |  |  |  |  | 10.9 |  |  |
Future Utilization of Foreign Tax Credits |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in valuation allowance |  |  |  |  |  |  |  | (24.8) | 7.6 |  |
Foreign Operating Loss Carryforwards |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in valuation allowance |  |  |  |  |  |  |  | (1.3) | 2.1 |  |
UGI Utilities |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |
PUC temporary rates order, reduction in revenue |  |  |  |  |  |  |  |  | 24.1 |  |
Flaga |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred tax assets relating to operating loss carryforwards |  |  |  |  |  |  |  | 2.0 |  |  |
UGI France |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred tax assets relating to operating loss carryforwards |  |  |  |  |  |  |  | 6.8 |  |  |
UGI International |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |
Incentive distribution, distribution |  |  |  |  |  |  |  |  | 12.8 | 47.6 |
Operating loss carryforwards |  |  |  |  |  |  |  | 14.3 |  |  |
Deferred tax assets relating to operating loss carryforwards |  |  |  |  |  |  |  | 3.0 |  |  |
Other Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred tax assets relating to operating loss carryforwards |  |  |  |  |  |  |  | 9.4 |  |  |
Income Tax Benefits | UGI Utilities |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |
PUC temporary rates order, reduction in revenue |  |  |  |  |  |  | $ 17.1 |  |  |  |
Future Amortization Of Regulatory Liabilities | UGI Utilities |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |
PUC temporary rates order, reduction in revenue |  |  |  |  |  |  |  |  | 7.0 |  |
Merger Sub |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |
Incentive distribution, distribution | $ 2,227.7 |  |  |  |  |  |  |  |  |  |
Cost for income tax purposes | 2,030.3 |  |  |  |  |  |  |  |  |  |
Deferred tax asset, step up in tax basis of the underlying assets | $ 512.3 |  |  |  |  |  |  | 512.3 |  |  |
Foreign | Flaga |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating loss carryforwards |  |  |  |  |  |  |  | 10.0 |  |  |
Foreign | UGI France |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating loss carryforwards |  |  |  |  |  |  |  | 22.0 |  |  |
State |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |
Decrease in income tax expense due to state tax flow through of accelerated depreciation |  |  |  |  |  |  |  | 7.4 | 4.2 | $ 2.5 |
Operating loss carryforwards |  |  |  |  |  |  |  | $ 147.9 |  |  |
French Parliament |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in income tax liabilities |  |  | $ 1.4 | $ 0.1 | $ 3.7 | $ (17.3) |  |  |  |  |
French Parliament | Foreign |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in income tax liabilities |  |  |  |  |  |  |  |  | $ 0.6 |  |

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