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Dropdown Transactions - Granite City Dropdown (Details) (USD $)
0 Months Ended 3 Months Ended
Jan. 13, 2015
May 09, 2014
Mar. 31, 2015
Jan. 13, 2015
Dec. 31, 2014
May 09, 2014
May 08, 2014
Business Acquisition [Line Items]              
Interest in partnership (as a percent) 56.10%sxc_InterestinPartnership 54.10%sxc_InterestinPartnership 56.10%sxc_InterestinPartnership 56.10%sxc_InterestinPartnership   54.10%sxc_InterestinPartnership 55.90%sxc_InterestinPartnership
Ownership interest of general partnership (as a percent)   2.00%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest 2.00%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest        
Interest payable     $ 8,700,000us-gaap_InterestPayableCurrent   $ 19,900,000us-gaap_InterestPayableCurrent    
Ownership interest, Public (as a percent) 41.90%sxc_LimitedLiabilityCompanyLLCorLimitedPartnershipLPOwnershipInterestPublic 43.90%sxc_LimitedLiabilityCompanyLLCorLimitedPartnershipLPOwnershipInterestPublic 41.90%sxc_LimitedLiabilityCompanyLLCorLimitedPartnershipLPOwnershipInterestPublic        
Adjustments from changes in ownership of SunCoke Energy Partners, L.P.     (6,200,000)us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination        
Granite City              
Business Acquisition [Line Items]              
Interest in partnership (as a percent) 25.00%sxc_InterestinPartnership
/ us-gaap_BusinessAcquisitionAxis
= sxc_GraniteCityMember
    25.00%sxc_InterestinPartnership
/ us-gaap_BusinessAcquisitionAxis
= sxc_GraniteCityMember
     
Ownership interest of general partnership (as a percent) 2.00%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest
/ us-gaap_BusinessAcquisitionAxis
= sxc_GraniteCityMember
           
Adjustments from changes in ownership of SunCoke Energy Partners, L.P. 6,200,000us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination
/ us-gaap_BusinessAcquisitionAxis
= sxc_GraniteCityMember
           
SunCoke Energy Partners, L.P. | Granite City              
Business Acquisition [Line Items]              
Interest acquired (as a percent) 75.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= sxc_GraniteCityMember
/ dei_LegalEntityAxis
= sxc_SunCokeEnergyPartnersL.P.Member
  75.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= sxc_GraniteCityMember
/ dei_LegalEntityAxis
= sxc_SunCokeEnergyPartnersL.P.Member
75.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= sxc_GraniteCityMember
/ dei_LegalEntityAxis
= sxc_SunCokeEnergyPartnersL.P.Member
     
Total consideration received 245,000,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= sxc_GraniteCityMember
/ dei_LegalEntityAxis
= sxc_SunCokeEnergyPartnersL.P.Member
           
Interest payable 5,600,000us-gaap_InterestPayableCurrent
/ us-gaap_BusinessAcquisitionAxis
= sxc_GraniteCityMember
/ dei_LegalEntityAxis
= sxc_SunCokeEnergyPartnersL.P.Member
    5,600,000us-gaap_InterestPayableCurrent
/ us-gaap_BusinessAcquisitionAxis
= sxc_GraniteCityMember
/ dei_LegalEntityAxis
= sxc_SunCokeEnergyPartnersL.P.Member
     
Redemption premium 7,700,000us-gaap_RedemptionPremium
/ us-gaap_BusinessAcquisitionAxis
= sxc_GraniteCityMember
/ dei_LegalEntityAxis
= sxc_SunCokeEnergyPartnersL.P.Member
           
Consideration withheld 45,000,000sxc_BusinessCombinationConsiderationWithheld
/ us-gaap_BusinessAcquisitionAxis
= sxc_GraniteCityMember
/ dei_LegalEntityAxis
= sxc_SunCokeEnergyPartnersL.P.Member
           
Common Units | SunCoke Energy Partners, L.P. | Granite City              
Business Acquisition [Line Items]              
Limited partner common units 50,700,000us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned
/ us-gaap_BusinessAcquisitionAxis
= sxc_GraniteCityMember
/ dei_LegalEntityAxis
= sxc_SunCokeEnergyPartnersL.P.Member
/ us-gaap_StatementEquityComponentsAxis
= sxc_CommonUnitsMember
    50,700,000us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned
/ us-gaap_BusinessAcquisitionAxis
= sxc_GraniteCityMember
/ dei_LegalEntityAxis
= sxc_SunCokeEnergyPartnersL.P.Member
/ us-gaap_StatementEquityComponentsAxis
= sxc_CommonUnitsMember
     
General Partner | SunCoke Energy Partners, L.P. | Granite City              
Business Acquisition [Line Items]              
Limited partner common units 1,000,000us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned
/ us-gaap_BusinessAcquisitionAxis
= sxc_GraniteCityMember
/ dei_LegalEntityAxis
= sxc_SunCokeEnergyPartnersL.P.Member
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_GeneralPartnerMember
    1,000,000us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned
/ us-gaap_BusinessAcquisitionAxis
= sxc_GraniteCityMember
/ dei_LegalEntityAxis
= sxc_SunCokeEnergyPartnersL.P.Member
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_GeneralPartnerMember
     
Term loan | SunCoke Energy Partners, L.P. | Granite City              
Business Acquisition [Line Items]              
Long-term debt 135,000,000us-gaap_LongTermDebt
/ us-gaap_BusinessAcquisitionAxis
= sxc_GraniteCityMember
/ dei_LegalEntityAxis
= sxc_SunCokeEnergyPartnersL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= sxc_TermLoansMember
    135,000,000us-gaap_LongTermDebt
/ us-gaap_BusinessAcquisitionAxis
= sxc_GraniteCityMember
/ dei_LegalEntityAxis
= sxc_SunCokeEnergyPartnersL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= sxc_TermLoansMember
     
Interest rate on senior notes (as a percent) 7.625%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_BusinessAcquisitionAxis
= sxc_GraniteCityMember
/ dei_LegalEntityAxis
= sxc_SunCokeEnergyPartnersL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= sxc_TermLoansMember
    7.625%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_BusinessAcquisitionAxis
= sxc_GraniteCityMember
/ dei_LegalEntityAxis
= sxc_SunCokeEnergyPartnersL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= sxc_TermLoansMember
     
Private Placement | SunCoke Energy Partners, L.P.              
Business Acquisition [Line Items]              
Long-term debt 200,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= sxc_SunCokeEnergyPartnersL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_PrivatePlacementMember
    200,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= sxc_SunCokeEnergyPartnersL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_PrivatePlacementMember