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Earnings per Share/Limited Partner Unit - Partnership's Calculation of Earnings per Share Limited Partner Unit (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
Limited Partners Capital Account [Line Items]            
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            
Limited Partners Capital Account [Line Items]            
Common unitholders' interest in net income attributable to Hess Midstream LP     $ 7.9     $ 16.6
Net income attributable to Hess Midstream LP per limited partner unit (basic and diluted):            
Basic and diluted [1]     $ 0.29     $ 0.61
Weighted average limited partner units outstanding prior to the Restructuring, Basic:            
Units outstanding prior to the Restructuring, Basic [1]     27.3     27.3
Weighted average limited partner units outstanding prior to the Restructuring, Diluted:            
Units outstanding prior to the Restructuring, Diluted [1]     27.5     27.5
Subordinated Units            
Limited Partners Capital Account [Line Items]            
Common unitholders' interest in net income attributable to Hess Midstream LP     $ 7.9     $ 16.5
Net income attributable to Hess Midstream LP per limited partner unit (basic and diluted):            
Basic and diluted [1]     $ 0.29     $ 0.61
Weighted average limited partner units outstanding prior to the Restructuring, Basic:            
Units outstanding prior to the Restructuring, Basic [1]     27.3     27.3
Weighted average limited partner units outstanding prior to the Restructuring, Diluted:            
Units outstanding prior to the Restructuring, Diluted [1]     27.3     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 $ 0.29       $ 0.66  
Net income attributable to Hess Midstream LP per Class A share, Diluted $ 0.29       $ 0.64  
Net income attributable to Hess Midstream LP per limited partner unit (basic and diluted):            
Weighted average Class A shares outstanding subsequent to the restructuring, Basic 18.0       18.0  
Weighted average Class A shares outstanding subsequent to the restructuring, Diluted 18.1       18.1  
[1] The financial information presented in this report has been retrospectively adjusted for the acquisition of Hess Infrastructure Partners LP.