Related Party Transactions - Summary of Classification of Charges between Operating and Maintenance Expenses and General and Administrative Expenses (Detail) - Hess - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Related Party Transaction [Line Items]
Operating and maintenance expenses	$ 63.6	$ 62.8	$ 53.1
General and administrative expenses	15.4	15.1	15.5
Total	$ 79.0	$ 77.9	$ 68.6