CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues
Affiliate services		$ 1,203.8	$ 1,091.6	$ 847.6
Type of Revenue [Extensible List]		us-gaap:ServiceMember	us-gaap:ServiceMember	us-gaap:ServiceMember
Other income			$ 0.3	$ 0.7
Total revenues		$ 1,203.8	1,091.9	848.3
Costs and expenses
Operating and maintenance expenses (exclusive of depreciation shown separately below)		288.3	337.4	276.8
Depreciation expense		165.6	156.9	142.5
General and administrative expenses		22.7	21.1	52.4
Total costs and expenses		476.6	515.4	471.7
Income from operations		727.2	576.5	376.6
Income from equity investments		10.6	10.3	3.4
Interest expense, net		105.4	94.7	62.4
Gain on sale of property, plant and equipment			0.1
Income before income tax expense		632.4	492.2	317.6
Income tax expense		14.6	7.3	(0.1)
Net income		617.8	484.9	317.7
Less: Net income attributable to noncontrolling interest				(55.0)
Less: Net income attributable to noncontrolling interest		571.4	460.9	302.6
Net income attributable to Hess Midstream LP		46.4	24.0	70.1
Less: General partners' interest in net income prior to the Restructuring				3.4
Limited partners' interest in net income		$ 46.4	$ 24.0	$ 66.7
Common Units
Weighted average limited partner units outstanding prior to the Restructuring, Basic:
Units outstanding prior to the Restructuring, Basic				27.3
Weighted average limited partner units outstanding prior to the Restructuring, Diluted:
Units outstanding prior to the Restructuring, Diluted				27.5
Subordinated Units
Weighted average limited partner units outstanding prior to the Restructuring, Basic:
Units outstanding prior to the Restructuring, Basic				27.3
Weighted average limited partner units outstanding prior to the Restructuring, Diluted:
Units outstanding prior to the Restructuring, Diluted				27.3
Class A Shares
Net income attributable to Hess Midstream LP per Class A share:
Net income attributable to Hess Midstream LP per Class A share, Basic	[1]	$ 1.81	$ 1.33	$ 1.21
Net income attributable to Hess Midstream LP per Class A share, Diluted	[1]	$ 1.76	$ 1.31	$ 1.20
Weighted average Class A shares outstanding
Weighted average Class A shares outstanding, Basic		25.6	18.0	18.0
Weighted average Class A shares outstanding, Diluted		25.7	18.1	18.0

[1] *Net income attributable to Hess Midstream LP per Class A Share/limited partner unit for 2019 was calculated by combining net income per limited partner unit (common and subordinated) for the period prior to the Restructuring on December 16, 2019, and net income per Class A Share for the period subsequent to the Restructuring.