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Acquisitions - Consolidated Statements of Operations (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
 [1]
Jun. 30, 2020
Jun. 30, 2019
Revenues and other income            
Affiliate services $ 269.8   $ 190.2 [1]   $ 560.4 $ 379.6 [1]
Type of Revenue [Extensible List] hesm:AffiliateServicesMember   hesm:AffiliateServicesMember [1]   hesm:AffiliateServicesMember hesm:AffiliateServicesMember [1]
Other income     $ 0.1 [1]   $ 0.2 $ 0.3 [1]
Total revenues $ 269.8   190.3 [1]   560.6 379.9 [1]
Costs and expenses            
Operating and maintenance expenses (exclusive of depreciation shown separately below) 95.0   57.9 [1]   186.9 112.2 [1]
Depreciation expense 38.9   35.4 [1]   77.4 69.0 [1]
General and administrative expenses 4.1   5.8 [1]   11.7 11.7 [1]
Total costs and expenses 138.0   99.1 [1]   276.0 192.9 [1]
Income from operations 131.8   91.2 [1]   284.6 187.0 [1]
Interest expense, net 23.3   16.8 [1]   48.1 31.8 [1]
Net income 107.8 $ 129.0 74.4 [1] $ 80.8 236.8 155.2 [1]
Less: Net income (loss) attributable to net parent investment [1]     (16.5)     (31.0)
Less: Net income (loss) attributable to noncontrolling interest 102.5   74.1 [1]   225.0 151.3 [1]
Net income attributable to Hess Midstream LP 5.3   16.8 [1]   11.8 34.9 [1]
Less: General partner's interest in net income [1]     1.0     1.8
Limited partners' interest in net income $ 5.3   $ 15.8 [1]   $ 11.8 $ 33.1 [1]
Common Units            
Net income attributable to Hess Midstream LP per limited partner unit (basic and diluted):            
Net income attributable to Hess Midstream Partners per limited partner unit [1]     $ 0.29     $ 0.61
Weighted average limited partner units outstanding, Basic:            
Units outstanding prior to the Restructuring, Basic [1]     27.3     27.3
Weighted average limited partner units outstanding, Diluted:            
Units outstanding prior to the Restructuring, Diluted [1]     27.5     27.5
Subordinated Units            
Net income attributable to Hess Midstream LP per limited partner unit (basic and diluted):            
Net income attributable to Hess Midstream Partners per limited partner unit [1]     $ 0.29     $ 0.61
Weighted average limited partner units outstanding, Basic:            
Units outstanding prior to the Restructuring, Basic [1]     27.3     27.3
Weighted average limited partner units outstanding, Diluted:            
Units outstanding prior to the Restructuring, Diluted [1]     27.3     27.3
Partnership as Previously Reported            
Revenues and other income            
Affiliate services     $ 172.7     $ 346.7
Type of Revenue [Extensible List]     hesm:AffiliateServicesMember     hesm:AffiliateServicesMember
Other income     $ 0.1     $ 0.3
Total revenues     172.8     347.0
Costs and expenses            
Operating and maintenance expenses (exclusive of depreciation shown separately below)     43.6     85.5
Depreciation expense     34.0     66.6
General and administrative expenses     3.7     7.7
Total costs and expenses     81.3     159.8
Income from operations     91.5     187.2
Interest expense, net     0.6     1.0
Net income     90.9     186.2
Less: Net income (loss) attributable to noncontrolling interest     74.1     151.3
Net income attributable to Hess Midstream LP     16.8     34.9
Less: General partner's interest in net income     1.0     1.8
Limited partners' interest in net income     $ 15.8     $ 33.1
Partnership as Previously Reported | Common Units            
Net income attributable to Hess Midstream LP per limited partner unit (basic and diluted):            
Net income attributable to Hess Midstream Partners per limited partner unit     $ 0.29     $ 0.61
Weighted average limited partner units outstanding, Basic:            
Units outstanding prior to the Restructuring, Basic     27.3     27.3
Weighted average limited partner units outstanding, Diluted:            
Units outstanding prior to the Restructuring, Diluted     27.5     27.5
Partnership as Previously Reported | Subordinated Units            
Net income attributable to Hess Midstream LP per limited partner unit (basic and diluted):            
Net income attributable to Hess Midstream Partners per limited partner unit     $ 0.29     $ 0.61
Weighted average limited partner units outstanding, Basic:            
Units outstanding prior to the Restructuring, Basic     27.3     27.3
Weighted average limited partner units outstanding, Diluted:            
Units outstanding prior to the Restructuring, Diluted     27.3     27.3
Restatement Adjustment | Acquisition of HIP            
Revenues and other income            
Affiliate services     $ 17.5     $ 32.9
Type of Revenue [Extensible List]     hesm:AffiliateServicesMember     hesm:AffiliateServicesMember
Total revenues     $ 17.5     $ 32.9
Costs and expenses            
Operating and maintenance expenses (exclusive of depreciation shown separately below)     14.3     26.7
Depreciation expense     1.4     2.4
General and administrative expenses     2.1     4.0
Total costs and expenses     17.8     33.1
Income from operations     (0.3)     (0.2)
Interest expense, net     16.2     30.8
Net income     (16.5)     (31.0)
Less: Net income (loss) attributable to net parent investment     $ (16.5)     $ (31.0)
[1] The financial information presented in this report has been retrospectively adjusted for the acquisition of Hess Infrastructure Partners LP.