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Summary of Significant Accounting Policies - (Narrative) (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Oct. 01, 2019
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Operating lease ROU assets | $ 431.8 |
Lease Liabilities | $ 438.3 |
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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