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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2016 | Mar. 31, 2017 | Mar. 31, 2017 | Sep. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2015
Accounting Policies [Abstract] |  |  |  |  |  |
Net deferred debt issuance costs |  |  |  |  | $ 29.6 |
Segment Reporting Information |  |  |  |  |  |
Income tax benefits associated with share-based payments |  | $ 4.8 | $ 7.0 |  |  |
Retained Earnings |  |  |  |  |  |
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 |  |  |  |  |  |
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 |  |  |  |  |
Private Equity Partnership That Invests in Renewable Energy Companies |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |
Carrying amount of investment |  | $ 11.0 | $ 11.0 |  |  |

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