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Dropdown Transactions - Haverhill and Middletown Dropdown (Details) (USD $)
Share data in Millions, unless otherwise specified
0 Months Ended 3 Months Ended
Jan. 13, 2015
May 09, 2014
Mar. 31, 2015
Jun. 30, 2014
May 08, 2014
Dec. 31, 2014
Business Acquisition [Line Items]            
Ownership interest of general partnership (as a percent)   2.00%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest 2.00%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest      
Interest in partnership (as a percent) 56.10%sxc_InterestinPartnership 54.10%sxc_InterestinPartnership 56.10%sxc_InterestinPartnership   55.90%sxc_InterestinPartnership  
Ownership interest, Public (as a percent) 41.90%sxc_LimitedLiabilityCompanyLLCorLimitedPartnershipLPOwnershipInterestPublic 43.90%sxc_LimitedLiabilityCompanyLLCorLimitedPartnershipLPOwnershipInterestPublic 41.90%sxc_LimitedLiabilityCompanyLLCorLimitedPartnershipLPOwnershipInterestPublic      
Haverhill Coke Company LLC and Middletown Coke Company LLC            
Business Acquisition [Line Items]            
Decrease in noncontrolling interest       $ 83,700,000us-gaap_MinorityInterestDecreaseFromRedemptions
/ us-gaap_BusinessAcquisitionAxis
= sxc_HaverhillCokeCompanyLLCandMiddletownCokeCompanyLLCMember
   
SunCoke Energy Partners, L.P. | Haverhill Coke Company LLC and Middletown Coke Company LLC            
Business Acquisition [Line Items]            
Interest acquired (as a percent)   33.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= sxc_HaverhillCokeCompanyLLCandMiddletownCokeCompanyLLCMember
/ dei_LegalEntityAxis
= sxc_SunCokeEnergyPartnersL.P.Member
       
Total consideration received   365,000,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= sxc_HaverhillCokeCompanyLLCandMiddletownCokeCompanyLLCMember
/ dei_LegalEntityAxis
= sxc_SunCokeEnergyPartnersL.P.Member
       
Limited partner common units   10,400,000us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned
/ us-gaap_BusinessAcquisitionAxis
= sxc_HaverhillCokeCompanyLLCandMiddletownCokeCompanyLLCMember
/ dei_LegalEntityAxis
= sxc_SunCokeEnergyPartnersL.P.Member
       
Cash transferred   3,400,000sxc_BusinessAcquisitionConsiderationTransferredCash
/ us-gaap_BusinessAcquisitionAxis
= sxc_HaverhillCokeCompanyLLCandMiddletownCokeCompanyLLCMember
/ dei_LegalEntityAxis
= sxc_SunCokeEnergyPartnersL.P.Member
       
Consideration withheld   7,000,000sxc_BusinessCombinationConsiderationWithheld
/ us-gaap_BusinessAcquisitionAxis
= sxc_HaverhillCokeCompanyLLCandMiddletownCokeCompanyLLCMember
/ dei_LegalEntityAxis
= sxc_SunCokeEnergyPartnersL.P.Member
       
Redemption premium   11,400,000us-gaap_RedemptionPremium
/ us-gaap_BusinessAcquisitionAxis
= sxc_HaverhillCokeCompanyLLCandMiddletownCokeCompanyLLCMember
/ dei_LegalEntityAxis
= sxc_SunCokeEnergyPartnersL.P.Member
       
Proceeds from private placement debt   263,100,000us-gaap_ProceedsFromIssuanceOfPrivatePlacement
/ us-gaap_BusinessAcquisitionAxis
= sxc_HaverhillCokeCompanyLLCandMiddletownCokeCompanyLLCMember
/ dei_LegalEntityAxis
= sxc_SunCokeEnergyPartnersL.P.Member
       
Common Units | SunCoke Energy Partners, L.P. | Haverhill Coke Company LLC and Middletown Coke Company LLC            
Business Acquisition [Line Items]            
Common units in shares   2.7us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= sxc_HaverhillCokeCompanyLLCandMiddletownCokeCompanyLLCMember
/ dei_LegalEntityAxis
= sxc_SunCokeEnergyPartnersL.P.Member
/ us-gaap_StatementEquityComponentsAxis
= sxc_CommonUnitsMember
       
Limited partner common units   80,000,000us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned
/ us-gaap_BusinessAcquisitionAxis
= sxc_HaverhillCokeCompanyLLCandMiddletownCokeCompanyLLCMember
/ dei_LegalEntityAxis
= sxc_SunCokeEnergyPartnersL.P.Member
/ us-gaap_StatementEquityComponentsAxis
= sxc_CommonUnitsMember
       
Common units sold   3.2us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_BusinessAcquisitionAxis
= sxc_HaverhillCokeCompanyLLCandMiddletownCokeCompanyLLCMember
/ dei_LegalEntityAxis
= sxc_SunCokeEnergyPartnersL.P.Member
/ us-gaap_StatementEquityComponentsAxis
= sxc_CommonUnitsMember
       
Net proceeds   88,700,000us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_BusinessAcquisitionAxis
= sxc_HaverhillCokeCompanyLLCandMiddletownCokeCompanyLLCMember
/ dei_LegalEntityAxis
= sxc_SunCokeEnergyPartnersL.P.Member
/ us-gaap_StatementEquityComponentsAxis
= sxc_CommonUnitsMember
       
General Partner | SunCoke Energy Partners, L.P. | Haverhill Coke Company LLC and Middletown Coke Company LLC            
Business Acquisition [Line Items]            
Limited partner common units   3,300,000us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned
/ us-gaap_BusinessAcquisitionAxis
= sxc_HaverhillCokeCompanyLLCandMiddletownCokeCompanyLLCMember
/ dei_LegalEntityAxis
= sxc_SunCokeEnergyPartnersL.P.Member
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_GeneralPartnerMember
       
Term loan | SunCoke Energy Partners, L.P. | Haverhill Coke Company LLC and Middletown Coke Company LLC            
Business Acquisition [Line Items]            
Long-term debt   271,300,000us-gaap_LongTermDebt
/ us-gaap_BusinessAcquisitionAxis
= sxc_HaverhillCokeCompanyLLCandMiddletownCokeCompanyLLCMember
/ dei_LegalEntityAxis
= sxc_SunCokeEnergyPartnersL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= sxc_TermLoansMember
       
Partnership notes, due 2020            
Business Acquisition [Line Items]            
Long-term debt     614,900,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= sxc_SeniorNotesDue2020Member
    411,500,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= sxc_SeniorNotesDue2020Member
Interest rate on senior notes (as a percent)     7.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= sxc_SeniorNotesDue2020Member
    7.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= sxc_SeniorNotesDue2020Member
Partnership notes, due 2020 | Haverhill Coke Company LLC and Middletown Coke Company LLC            
Business Acquisition [Line Items]            
Pre-funded Interest   5,000,000sxc_ProceedsfromIssuanceofPrivatePlacementProceedstoFundInterest
/ us-gaap_BusinessAcquisitionAxis
= sxc_HaverhillCokeCompanyLLCandMiddletownCokeCompanyLLCMember
/ us-gaap_LongtermDebtTypeAxis
= sxc_SeniorNotesDue2020Member
       
Partnership notes, due 2020 | SunCoke Energy Partners, L.P.            
Business Acquisition [Line Items]            
Long-term debt   250,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= sxc_SunCokeEnergyPartnersL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= sxc_SeniorNotesDue2020Member
       
Interest rate on senior notes (as a percent)   7.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_LegalEntityAxis
= sxc_SunCokeEnergyPartnersL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= sxc_SeniorNotesDue2020Member