Description of Business and Basis of Presentation Description of Business and Basis of Presentation (Tables)

12 Months Ended

Dec. 31, 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 December 31, 2017:

	SHLX Ownership		Shell's Retained Ownership
Pecten Midstream LLC (“Pecten”)	100.0	%	—	%
Sand Dollar Pipeline LLC (“Sand Dollar”)	100.0	%	—	%
Triton West LLC (“Triton”)	100.0	%	—	%
Zydeco Pipeline Company LLC (“Zydeco”)	92.5	%	7.5	%
Mars Oil Pipeline Company LLC (“Mars”)	71.5	%	—	%
Odyssey Pipeline L.L.C. (“Odyssey”)	71.0	%	—	%
Bengal Pipeline Company LLC (“Bengal”)	50.0	%	—	%
Crestwood Permian Basin LLC (“Permian Basin”)	50.0	%	—	%
LOCAP LLC (“LOCAP”)	41.48	%	—	%
Poseidon Oil Pipeline Company LLC (“Poseidon”)	36.0	%	—	%
Explorer Pipeline Company (“Explorer”)	12.62	%	25.97	%
Proteus Oil Pipeline Company, LLC (“Proteus”)	10.0	%	—	%
Endymion Oil Pipeline Company, LLC (“Endymion”)	10.0	%	—	%
Colonial Pipeline Company (“Colonial”)	6.0	%	10.12	%
Cleopatra Gas Gathering Company, LLC (“Cleopatra”)	1.0	%	—	%