Change in Income Tax Rate, Effect of Change on Earnings Per Share, Basic and Diluted

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Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount

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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain.

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-Publisher FASB
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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences, netted by jurisdiction.

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-Publisher FASB
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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
Accounting Policies [Abstract]
Net deferred debt issuance costs			$ 30.7
Segment Reporting Information
Income tax benefits associated with share-based payments	$ 2.2
Retained Earnings [Member]
Segment Reporting Information
Cumulative effect of change in accounting for employee share-based payments		$ 5.0		$ 0.0
New Accounting Pronouncement, Early Adoption, Effect \| Accounting Standards Update 2016-09
Segment Reporting Information
Decrease in deferred income tax liabilities for excess tax benefits related to prior periods		5.0
New Accounting Pronouncement, Early Adoption, Effect \| Accounting Standards Update 2016-09 \| Retained Earnings [Member]
Segment Reporting Information
Cumulative effect of change in accounting for employee share-based payments		$ 5.0
UGI France
Segment Reporting Information
Estimated deferred tax benefit resulting from future income tax reduction	$ 27.4
Reduction in per share, basic and diluted resulting from future income tax reduction (in dollars per share)	$ 0.15