The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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Amount of lessee's right to use underlying asset under operating lease.

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Summary of Significant Accounting Policies - (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Oct. 01, 2019
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%