Summary of Significant Accounting Policies - Narrative (Details) $ in Millions	1 Months Ended	3 Months Ended
	Feb. 28, 2021 USD ($)	Mar. 31, 2021 USD ($) mi
UGI Penn East LLC | Affiliated Entity | Penn East Pipeline Company LLC
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity method investment ownership percent		20.00%
Southern Company | Affiliated Entity | Penn East Pipeline Company LLC
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity method investment ownership percent		20.00%
New Jersey Resources | Affiliated Entity | Penn East Pipeline Company LLC
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity method investment ownership percent		20.00%
South Jersey Industries | Affiliated Entity | Penn East Pipeline Company LLC
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity method investment ownership percent		20.00%
Enbridge Inc | Affiliated Entity | Penn East Pipeline Company LLC
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity method investment ownership percent		20.00%
Pine Run Midstream, LLC
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Enterprise value	$ 205
Area of natural gas pipeline to be operated (in miles) | mi		43
Pine Run Midstream, LLC | Energy Services
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Enterprise value		$ 57
Equity method investment ownership percent		49.00%