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Segments - Financial Data for Each Reportable Segment (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Segment Reporting Information [Line Items]    
Revenues and other income $ 290.8 $ 189.6 [1]
Net income (loss) 129.0 80.8 [1]
Net income (loss) attributable to Hess Midstream LP 6.5 18.1 [1]
Depreciation expense 38.5 33.6 [1]
Proportional share of equity affiliates' depreciation 1.3  
Income from equity investments 2.7  
Interest expense, net 24.8 15.0 [1]
Income tax expense (benefit) 1.7  
Adjusted EBITDA 195.3 129.4
Capital expenditures 57.0 126.6
Interest and Other    
Segment Reporting Information [Line Items]    
Net income (loss) (30.3) (17.3)
Net income (loss) attributable to Hess Midstream LP (3.6) (1.6)
Interest expense, net 24.8 15.0
Income tax expense (benefit) 1.7  
Adjusted EBITDA (3.8) (2.3)
Gathering Opco | Operating Segments    
Segment Reporting Information [Line Items]    
Revenues and other income 141.6 94.4
Net income (loss) 75.9 44.2
Net income (loss) attributable to Hess Midstream LP 4.8 8.6
Depreciation expense 23.3 18.4
Adjusted EBITDA 99.2 62.6
Capital expenditures 15.8 125.8
Processing and Storage | Operating Segments    
Segment Reporting Information [Line Items]    
Revenues and other income 97.0 66.5
Net income (loss) 62.7 41.1
Net income (loss) attributable to Hess Midstream LP 4.0 8.6
Depreciation expense 11.2 11.2
Proportional share of equity affiliates' depreciation 1.3  
Income from equity investments 2.7  
Adjusted EBITDA 75.2 52.3
Capital expenditures 41.1 1.1
Terminaling and Export | Operating Segments    
Segment Reporting Information [Line Items]    
Revenues and other income 52.2 28.7
Net income (loss) 20.7 12.8
Net income (loss) attributable to Hess Midstream LP 1.3 2.5
Depreciation expense 4.0 4.0
Adjusted EBITDA 24.7 16.8
Capital expenditures $ 0.1 $ (0.3)
[1] The financial information presented in this report has been retrospectively adjusted for the acquisition of Hess Infrastructure Partners LP.