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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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