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Segments - Financial Data for Each Reportable Segment (Detail) - USD ($)
$ 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
Segment Reporting Information [Line Items]            
Revenues and other income $ 269.8   $ 190.3 [1]   $ 560.6 $ 379.9 [1]
Net income (loss) 107.8 $ 129.0 74.4 [1] $ 80.8 236.8 155.2 [1]
Net income (loss) attributable to Hess Midstream LP 5.3   16.8 [1]   11.8 34.9 [1]
Depreciation expense 38.9   35.4 [1]   77.4 69.0 [1]
Proportional share of equity affiliates' depreciation 1.2       2.5  
Income from equity investments 0.9       3.6  
Interest expense, net 23.3   16.8 [1]   48.1 31.8 [1]
Income tax expense (benefit) 1.7       3.4  
Gain on sale of property, plant and equipment 0.1       0.1  
Adjusted EBITDA 172.8   126.6   368.1 256.0
Capital expenditures 78.8   69.2   135.8 195.8
Interest and Other            
Segment Reporting Information [Line Items]            
Net income (loss) (25.6)   (19.4)   (55.9) (36.7)
Net income (loss) attributable to Hess Midstream LP (3.1)   (1.8)   (6.7) (3.4)
Interest expense, net 23.3   16.8   48.1 31.8
Income tax expense (benefit) 1.7       3.4  
Adjusted EBITDA (0.6)   (2.6)   (4.4) (4.9)
Gathering Opco | Operating Segments            
Segment Reporting Information [Line Items]            
Revenues and other income 136.4   97.7   278.0 192.1
Net income (loss) 71.7   41.8   147.6 86.0
Net income (loss) attributable to Hess Midstream LP 4.6   8.1   9.4 16.7
Depreciation expense 23.7   20.3   47.0 38.7
Gain on sale of property, plant and equipment 0.1       0.1  
Adjusted EBITDA 95.3   62.1   194.5 124.7
Capital expenditures 25.9   61.6   41.7 187.4
Processing and Storage | Operating Segments            
Segment Reporting Information [Line Items]            
Revenues and other income 86.8   67.5   183.8 134.0
Net income (loss) 45.8   40.3   108.5 81.4
Net income (loss) attributable to Hess Midstream LP 2.8   8.0   6.8 16.6
Depreciation expense 11.2   11.1   22.4 22.3
Proportional share of equity affiliates' depreciation 1.2       2.5  
Income from equity investments 0.9       3.6  
Adjusted EBITDA 58.2   51.4   133.4 103.7
Capital expenditures 52.7   7.6   93.8 8.7
Terminaling and Export | Operating Segments            
Segment Reporting Information [Line Items]            
Revenues and other income 46.6   25.1   98.8 53.8
Net income (loss) 15.9   11.7   36.6 24.5
Net income (loss) attributable to Hess Midstream LP 1.0   2.5   2.3 5.0
Depreciation expense 4.0   4.0   8.0 8.0
Adjusted EBITDA 19.9   $ 15.7   44.6 32.5
Capital expenditures $ 0.2       $ 0.3 $ (0.3)
[1] The financial information presented in this report has been retrospectively adjusted for the acquisition of Hess Infrastructure Partners LP.