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		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Related Party Transaction [Line Items]
Operating and maintenance expenses	$ 89.0	$ 89.4	$ 254.6	$ 225.0
Hess
Related Party Transaction [Line Items]
Operating and maintenance expenses	$ 21.0	$ 18.7	$ 60.6	$ 56.1
Operating Cost and Expense, Related Party [Extensible Enumeration]	us-gaap:RelatedPartyMember	us-gaap:RelatedPartyMember	us-gaap:RelatedPartyMember	us-gaap:RelatedPartyMember
General and administrative expenses	$ 3.9	$ 4.0	$ 10.9	$ 11.7
Selling, General, and Administrative Expenses, Related Party [Extensible Enumeration]	us-gaap:RelatedPartyMember	us-gaap:RelatedPartyMember	us-gaap:RelatedPartyMember	us-gaap:RelatedPartyMember
Total	$ 24.9	$ 22.7	$ 71.5	$ 67.8