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Description of Business and Basis of Presentation (Tables)
 9 Months Ended
Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Ownership Percentage
The following table reflects our ownership, and Shell's retained ownership as of September 30, 2017.
 
SHLX Ownership
 
Shell's Retained Ownership
 
 
 
 
Pecten Midstream LLC (“Pecten”)
100.0
%
 
—

Sand Dollar Pipeline LLC (“Sand Dollar”)
100.0
%
 
—

Zydeco Pipeline Company LLC (“Zydeco”)
92.5
%
 
7.5
%
Bengal Pipeline Company LLC (“Bengal”)
50.0
%
 
—

Odyssey Pipeline LLC (“Odyssey”)
49.0
%
 
22.0
%
Mars Oil Pipeline Company LLC (“Mars”)
48.6
%
 
22.9
%
Poseidon Oil Pipeline Company LLC (“Poseidon”)
36.0
%
 
—

Proteus Oil Pipeline Company, LLC (“Proteus”)
10.0
%
 
—

Endymion Oil Pipeline Company, LLC (“Endymion”)
10.0
%
 
—

Colonial Pipeline Company (“Colonial”)
6.0
%
 
10.12
%
Explorer Pipeline Company (“Explorer”)
2.62
%
 
35.97
%
Cleopatra Gas Gathering Company, LLC (“Cleopatra”)
1.0
%
 
—