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Description of Business and Basis of Presentation (Details) - segment
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Description Of Business And Basis Of Presentation [Line Items]    
Number of reportable segments 1  
Pecten Midstream LLC (“Pecten”)    
Description Of Business And Basis Of Presentation [Line Items]    
SHLX Ownership 100.00%  
Sand Dollar Pipeline LLC (“Sand Dollar”)    
Description Of Business And Basis Of Presentation [Line Items]    
SHLX Ownership 100.00%  
Triton West LLC (“Triton”)    
Description Of Business And Basis Of Presentation [Line Items]    
SHLX Ownership 100.00%  
Zydeco Pipeline Company LLC (“Zydeco”)    
Description Of Business And Basis Of Presentation [Line Items]    
SHLX Ownership 92.50%  
Zydeco Pipeline Company LLC (“Zydeco”) | Zydeco Pipeline Company LLC (“Zydeco”)    
Description Of Business And Basis Of Presentation [Line Items]    
Shell’s Retained Ownership 7.50%  
Amberjack Pipeline Company LLC (“Amberjack”) - Series A    
Description Of Business And Basis Of Presentation [Line Items]    
SHLX Ownership 75.00% 75.00%
Amberjack Pipeline Company LLC (“Amberjack”) - Series B    
Description Of Business And Basis Of Presentation [Line Items]    
SHLX Ownership 50.00% 50.00%
Mars Oil Pipeline Company LLC (“Mars”)    
Description Of Business And Basis Of Presentation [Line Items]    
SHLX Ownership 71.50% 71.50%
Odyssey Pipeline L.L.C. (“Odyssey”)    
Description Of Business And Basis Of Presentation [Line Items]    
SHLX Ownership 71.00%  
Bengal Pipeline Company LLC (“Bengal”)    
Description Of Business And Basis Of Presentation [Line Items]    
SHLX Ownership 50.00% 50.00%
Crestwood Permian Basin LLC (“Permian Basin”)    
Description Of Business And Basis Of Presentation [Line Items]    
SHLX Ownership 50.00% 50.00%
LOCAP LLC (“LOCAP”)    
Description Of Business And Basis Of Presentation [Line Items]    
SHLX Ownership 41.48% 41.48%
Explorer Pipeline Company ("Explorer")    
Description Of Business And Basis Of Presentation [Line Items]    
SHLX Ownership 38.59% 38.59%
Poseidon Oil Pipeline Company LLC (“Poseidon”)    
Description Of Business And Basis Of Presentation [Line Items]    
SHLX Ownership 36.00% 36.00%
Colonial Pipeline Company (“Colonial”)    
Description Of Business And Basis Of Presentation [Line Items]    
SHLX Ownership 16.125% 16.125%
Proteus Oil Pipeline Company, LLC (“Proteus”)    
Description Of Business And Basis Of Presentation [Line Items]    
SHLX Ownership 10.00% 10.00%
Endymion Oil Pipeline Company, LLC (“Endymion”)    
Description Of Business And Basis Of Presentation [Line Items]    
SHLX Ownership 10.00% 10.00%
Cleopatra Gas Gathering Company, LLC (“Cleopatra”)    
Description Of Business And Basis Of Presentation [Line Items]    
SHLX Ownership 1.00%