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Summary of Significant Accounting Policies - Principles of Consolidation (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2019 USD ($) mi | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership interests in certain subsidiaries under equity method investment, maximum | 100.00% |  |
Investments | $ 242.4 | $ 147.2 |
Equity method investments | 189.6 | 87.6 | $ 59.1
Pennant |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investments | 90.8 |  |
UGI PennEast, LLC | PennEast |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investments | $ 84.7 | $ 72.6 |
Southern Company | PennEast |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage | 20.00% |  |
New Jersey Resources | PennEast |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage | 20.00% |  |
South Jersey Industries | PennEast |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage | 20.00% |  |
Enbridge Inc | PennEast |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage | 20.00% |  |
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 |  |
Affiliated Entity | UGI PennEast, LLC | PennEast |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage | 20.00% |  |

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