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Summary of Significant Accounting Policies - (Narrative) (Details) $ in Millions | Dec. 31, 2019 USD ($)
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Operating lease ROU assets | $ 429.6
Lease Liabilities | 429.6
ASU 2016-02 |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Operating lease ROU assets | 451.9
Lease Liabilities | $ 451.9
Southern Company | PennEast Pipeline Company, LLC |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Equity method investment ownership percent | 20.00%
New Jersey Resources | PennEast Pipeline Company, LLC |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Equity method investment ownership percent | 20.00%
South Jersey Industries | PennEast Pipeline Company, LLC |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Equity method investment ownership percent | 20.00%
Enbridge Inc | PennEast Pipeline Company, LLC |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Equity method investment ownership percent | 20.00%
Affiliated Entity | UGI PennEast, LLC | PennEast Pipeline Company, LLC |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Equity method investment ownership percent | 20.00%

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