Segments - Financial Data for Each Reportable Segment (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Revenues and other income		$ 1,275.2	$ 1,203.8	$ 1,091.9
Net income (loss)		620.6	617.8	484.9
Net income (loss) attributable to Hess Midstream LP		83.9	46.4	24.0
Depreciation expense		181.3	165.6	156.9
Proportional share of equity affiliates' depreciation		5.1	5.1	5.1
Income from equity investments		5.3	10.6	10.3
Interest expense, net		149.3	105.4	94.7
Income tax expense (benefit)		26.6	14.6	7.3
Gain on sale of property, plant and equipment				0.1
Adjusted EBITDA		982.9	908.5	748.8
Capital expenditures	[1]	231.8	183.0	253.0
Interest and Other
Segment Reporting Information [Line Items]
Net income (loss)		(183.1)	(127.3)	(108.0)
Net income (loss) attributable to Hess Midstream LP		(53.5)	(25.5)	(13.6)
Interest expense, net		149.3	105.4	94.7
Income tax expense (benefit)		26.6	14.6	7.3
Adjusted EBITDA		(7.2)	(7.3)	(6.0)
Gathering Opco | Operating Segments
Segment Reporting Information [Line Items]
Revenues and other income		677.9	630.6	561.9
Net income (loss)		389.6	377.6	300.7
Net income (loss) attributable to Hess Midstream LP		66.4	36.3	19.2
Depreciation expense		107.4	101.0	96.0
Gain on sale of property, plant and equipment				0.1
Adjusted EBITDA		497.0	478.6	396.6
Capital expenditures	[1]	210.2	154.0	96.2
Processing and Storage | Operating Segments
Segment Reporting Information [Line Items]
Revenues and other income		470.8	435.7	370.6
Net income (loss)		329.1	263.8	218.7
Net income (loss) attributable to Hess Midstream LP		56.6	25.5	13.7
Depreciation expense		57.7	48.4	44.8
Proportional share of equity affiliates' depreciation		5.1	5.1	5.1
Income from equity investments		5.3	10.6	10.3
Adjusted EBITDA		391.9	317.3	268.6
Capital expenditures	[1]	8.8	28.8	156.2
Terminaling and Export | Operating Segments
Segment Reporting Information [Line Items]
Revenues and other income		126.5	137.5	159.4
Net income (loss)		85.0	103.7	73.5
Net income (loss) attributable to Hess Midstream LP		14.4	10.1	4.7
Depreciation expense		16.2	16.2	16.1
Adjusted EBITDA		101.2	119.9	89.6
Capital expenditures	[1]	$ 12.8	$ 0.2	$ 0.6

[1] Includes expansion and maintenance capital expenditures.