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Related Party Transactions - Schedule of Condensed Combined Statement of Operations (Parenthetical) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Management Agreement  
Related Party Transaction [Line Items]  
Payment for general administrative services $ 1.8us-gaap_GeneralAndAdministrativeExpense
/ us-gaap_RelatedPartyTransactionAxis
= shlx_ManagementAgreementMember
Omnibus Agreement  
Related Party Transaction [Line Items]  
Payment for general administrative services $ 2.1us-gaap_GeneralAndAdministrativeExpense
/ us-gaap_RelatedPartyTransactionAxis
= shlx_OmnibusAgreementMember