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UNAUDITED CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (USD $)
In Millions
Total
Common unitholders - public
Common unitholders - public
Shell Pipeline Company L P
Subordinated Units
Shell Pipeline Company L P
General Partner
Shell Pipeline Company L P
Noncontrolling Interest
Beginning Balance at Dec. 31, 2014 $ 578.9us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest $ 1,016.2us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= shlx_CommonUnitsPublicMember
$ (140.3)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= shlx_ShellPipelineCompanyLPMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= shlx_CommonUnitsPublicMember
$ (440.9)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= shlx_ShellPipelineCompanyLPMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= shlx_SubordinatedUnitsMember
$ (18.0)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= shlx_ShellPipelineCompanyLPMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
$ 161.9us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Net income 23.1us-gaap_NetIncomeLossAllocatedToLimitedPartners 7.9us-gaap_NetIncomeLossAllocatedToLimitedPartners
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= shlx_CommonUnitsPublicMember
3.7us-gaap_NetIncomeLossAllocatedToLimitedPartners
/ dei_LegalEntityAxis
= shlx_ShellPipelineCompanyLPMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= shlx_CommonUnitsPublicMember
11.5us-gaap_NetIncomeLossAllocatedToLimitedPartners
/ dei_LegalEntityAxis
= shlx_ShellPipelineCompanyLPMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= shlx_SubordinatedUnitsMember
   
Net income 0.5us-gaap_NetIncomeLossAllocatedToGeneralPartners       0.5us-gaap_NetIncomeLossAllocatedToGeneralPartners
/ dei_LegalEntityAxis
= shlx_ShellPipelineCompanyLPMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
 
Net income 17.8us-gaap_NetIncomeLossAttributableToNoncontrollingInterest         17.8us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Net income 41.4us-gaap_ProfitLoss          
Quarterly distributions paid to unitholders and General Partner (14.4)shlx_DistributionsPaidToUnitholdersAndGeneralPartner (4.8)shlx_DistributionsPaidToUnitholdersAndGeneralPartner
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= shlx_CommonUnitsPublicMember
(2.2)shlx_DistributionsPaidToUnitholdersAndGeneralPartner
/ dei_LegalEntityAxis
= shlx_ShellPipelineCompanyLPMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= shlx_CommonUnitsPublicMember
(7.1)shlx_DistributionsPaidToUnitholdersAndGeneralPartner
/ dei_LegalEntityAxis
= shlx_ShellPipelineCompanyLPMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= shlx_SubordinatedUnitsMember
(0.3)shlx_DistributionsPaidToUnitholdersAndGeneralPartner
/ dei_LegalEntityAxis
= shlx_ShellPipelineCompanyLPMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
 
Quarterly distribution paid to noncontrolling interest (25.1)shlx_DistributionsPaidToNoncontrollingInterest         (25.1)shlx_DistributionsPaidToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Ending Balance at Mar. 31, 2015 $ 580.8us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest $ 1,019.3us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= shlx_CommonUnitsPublicMember
$ (138.8)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= shlx_ShellPipelineCompanyLPMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= shlx_CommonUnitsPublicMember
$ (436.5)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= shlx_ShellPipelineCompanyLPMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= shlx_SubordinatedUnitsMember
$ (17.8)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= shlx_ShellPipelineCompanyLPMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
$ 154.6us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember