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Supplemental Condensed Consolidating Financial Information (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jul. 23, 2014
Guarantor Obligations [Line Items]        
Discontinued Operation, Tax Effect of Income (Loss) from Disposal of Discontinued Operation $ 66.2us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation $ 9.7us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation $ (5.3)us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation  
Supplemental Condensed Consolidating Financial Information (Textual) [Abstract]        
Ownership percentage (as a percent) 100.00%us-gaap_EquityMethodInvestmentOwnershipPercentage      
Supplemental Condensed Consolidating Financial Information (Additional Textual) [Abstract]        
Preferred stock, par value $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare    
Preferred stock, shares authorized 50,000,000us-gaap_PreferredStockSharesAuthorized 50,000,000us-gaap_PreferredStockSharesAuthorized    
Preferred stock, shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued    
Common stock, par value $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare   $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 300,000,000us-gaap_CommonStockSharesAuthorized 300,000,000us-gaap_CommonStockSharesAuthorized    
Common stock, shares, issued 71,251,529us-gaap_CommonStockSharesIssued 70,892,140us-gaap_CommonStockSharesIssued    
Treasury stock, shares 4,977,115us-gaap_TreasuryStockShares 1,255,355us-gaap_TreasuryStockShares    
Guarantor Subsidiaries        
Supplemental Condensed Consolidating Financial Information (Textual) [Abstract]        
Guarantors obligations under the credit agreement $ 240us-gaap_GuaranteeObligationsCurrentCarryingValue
/ us-gaap_GuaranteeObligationsByNatureAxis
= sxc_NotesToGuarantorSubsidiariesMember
     
SunCoke Energy Partners, L.P.        
Supplemental Condensed Consolidating Financial Information (Textual) [Abstract]        
Partnership net assets restricted (as a percent) 25.00%sxc_AmountofRestrictedNetAssetsforConsolidatedandUnconsolidatedSubsidiariesPercent
/ dei_LegalEntityAxis
= sxc_SunCokeEnergyPartnersL.P.Member