Debt and Financing Arrangements - Other Financing Obligations (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Debt Instrument [Line Items]
Long-Term Debt	$ 5,215,796		$ 5,229,450
Long-term debt due within one year	33,164		31,718
Proceeds from other financing obligations	1,605	$ 4,547
Credit Agreement
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	500,000
Dalton Expansion Project
Debt Instrument [Line Items]
Long-Term Debt	245,600		246,800
Long-term debt due within one year	3,200		3,000
Atlantic Sunrise Project
Debt Instrument [Line Items]
Long-Term Debt	749,400		762,800
Long-term debt due within one year	28,700		27,400
Proceeds from other financing obligations	1,200	$ 4,300
Leidy South Project
Debt Instrument [Line Items]
Long-Term Debt	74,300		75,000
Long-term debt due within one year	1,300		$ 1,300
Williams Companies Inc | Credit Agreement
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 3,750,000