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Summary of Significant Accounting Policies - Principles of Consolidation (Details) $ in Millions | 12 Months Ended
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Sep. 30, 2018 USD ($) mi | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($)
Accounting Policies [Abstract] |  |  |
Ownership interests in certain subsidiaries under equity method investment, maximum | 100.00% |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments | $ 147.2 | $ 120.4 |
Equity method investments | 87.6 | 59.1 | $ 25.9
Deferred investment tax credit | $ 2.6 | $ 2.9 |
Effective income tax rate reconciliation, at federal statutory income tax rate, percent | 24.50% | 35.00% | 35.00%
UGI PennEast, LLC | PennEast |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage | 20.00% |  |
Equity method investments | $ 72.6 | $ 51.0 |
PennEast |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Area of natural gas pipeline to be constructed (in miles) | mi | 120 |  |
Pipeline contract term | 15 years |  |

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