Related Party Transactions - Summary of Classification of Charges between Operating and Maintenance Expenses and General and Administrative Expenses (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Related Party Transaction [Line Items]
Operating and maintenance expenses	$ 87.5	$ 73.1	$ 165.6	$ 135.6
Hess
Related Party Transaction [Line Items]
Operating and maintenance expenses	$ 20.5	$ 19.5	$ 39.6	$ 37.4
Operating Cost and Expense, Related Party [Extensible Enumeration]	us-gaap:RelatedPartyMember	us-gaap:RelatedPartyMember	us-gaap:RelatedPartyMember	us-gaap:RelatedPartyMember
General and administrative expenses	$ 3.5	$ 3.8	$ 7.0	$ 7.7
Selling, General, and Administrative Expenses, Related Party [Extensible Enumeration]	us-gaap:RelatedPartyMember	us-gaap:RelatedPartyMember	us-gaap:RelatedPartyMember	us-gaap:RelatedPartyMember
Total	$ 24.0	$ 23.3	$ 46.6	$ 45.1