Segments - Financial Data for Each Reportable Segment (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Revenues and other income		$ 305.0	$ 312.4
Net income (loss)		142.2	159.6
Net income (loss) attributable to Hess Midstream LP		20.7	16.9
Depreciation expense		47.4	44.4
Proportional share of equity affiliates' depreciation		1.3	1.3
Income from equity investments		1.6	0.4
Interest expense, net		41.6	31.3
Income tax expense (benefit)		6.5	5.0
Adjusted EBITDA		239.0	241.6
Capital expenditures	[1]	57.3	37.1
Interest and Other
Segment Reporting Information [Line Items]
Net income (loss)		(50.6)	(38.6)
Net income (loss) attributable to Hess Midstream LP		(14.5)	(9.4)
Interest expense, net		41.6	31.3
Income tax expense (benefit)		6.5	5.0
Adjusted EBITDA		(2.5)	(2.3)
Gathering Opco | Operating Segments
Segment Reporting Information [Line Items]
Revenues and other income		164.7	163.6
Net income (loss)		95.1	98.2
Net income (loss) attributable to Hess Midstream LP		17.4	13.0
Depreciation expense		28.8	25.9
Adjusted EBITDA		123.9	124.1
Capital expenditures	[1]	49.4	35.7
Processing and Storage | Operating Segments
Segment Reporting Information [Line Items]
Revenues and other income		114.4	113.8
Net income (loss)		80.1	78.1
Net income (loss) attributable to Hess Midstream LP		14.5	10.4
Depreciation expense		14.5	14.4
Proportional share of equity affiliates' depreciation		1.3	1.3
Income from equity investments		1.6	0.4
Adjusted EBITDA		95.9	93.8
Capital expenditures	[1]	0.9	0.9
Terminaling and Export | Operating Segments
Segment Reporting Information [Line Items]
Revenues and other income		25.9	35.0
Net income (loss)		17.6	21.9
Net income (loss) attributable to Hess Midstream LP		3.3	2.9
Depreciation expense		4.1	4.1
Adjusted EBITDA		21.7	26.0
Capital expenditures	[1]	$ 7.0	$ 0.5

[1] Includes acquisition, expansion and maintenance capital expenditures, as applicable.