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Environmental and Legal Contingencies (Details 6) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Jul. 31, 2013
Oct. 07, 2014
Antitrust Case [Member]      
Loss Contingencies [Line Items]      
Payments for Legal Settlements $ 5.8us-gaap_PaymentsForLegalSettlements
/ us-gaap_LitigationCaseAxis
= aks_AntitrustCaseMember		    
Breach Of Contract Case [Member]      
Loss Contingencies [Line Items]      
Loss contingency, damages sought, value 11.8us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_LitigationCaseAxis
= aks_BreachOfContractCaseMember		    
Loss Contingency, Range of Possible Loss, Minimum 12.0us-gaap_LossContingencyRangeOfPossibleLossMinimum
/ us-gaap_LitigationCaseAxis
= aks_BreachOfContractCaseMember		    
Loss Contingency, Range of Possible Loss, Maximum $ 14.0us-gaap_LossContingencyRangeOfPossibleLossMaximum
/ us-gaap_LitigationCaseAxis
= aks_BreachOfContractCaseMember		    
MOFCOM [Member] | Final [Member]      
Loss Contingencies [Line Items]      
Duty Rate   11.20%aks_DutyRate
/ us-gaap_LitigationCaseAxis
= aks_MOFCOMMember
/ us-gaap_LitigationStatusAxis
= aks_FinalMember		  
MOFCOM [Member] | Countervailing Duty [Member] | Preliminary [Member]      
Loss Contingencies [Line Items]      
Duty Rate   11.70%aks_DutyRate
/ aks_DutyTypeAxis
= aks_CountervailingDutyMember
/ us-gaap_LitigationCaseAxis
= aks_MOFCOMMember
/ us-gaap_LitigationStatusAxis
= aks_PreliminaryMember		  
MOFCOM [Member] | Countervailing Duty [Member] | Final [Member]      
Loss Contingencies [Line Items]      
Duty Rate   3.40%aks_DutyRate
/ aks_DutyTypeAxis
= aks_CountervailingDutyMember
/ us-gaap_LitigationCaseAxis
= aks_MOFCOMMember
/ us-gaap_LitigationStatusAxis
= aks_FinalMember		  
MOFCOM [Member] | Antidumping Duty [Member] | Final [Member]      
Loss Contingencies [Line Items]      
Duty Rate   7.80%aks_DutyRate
/ aks_DutyTypeAxis
= aks_AntidumpingDutyMember
/ us-gaap_LitigationCaseAxis
= aks_MOFCOMMember
/ us-gaap_LitigationStatusAxis
= aks_FinalMember		  
US Trade Case - NOES [Member] | Countervailing Duty [Member] | Final [Member] | CHINA      
Loss Contingencies [Line Items]      
Duty Rate     158.88%aks_DutyRate
/ aks_DutyTypeAxis
= aks_CountervailingDutyMember
/ us-gaap_LitigationCaseAxis
= aks_USTradeCaseNOESMember
/ us-gaap_LitigationStatusAxis
= aks_FinalMember
/ us-gaap_StatementGeographicalAxis
= country_CN
US Trade Case - NOES [Member] | Countervailing Duty [Member] | Final [Member] | Leicong Industrial Company [Member] | TAIWAN, PROVINCE OF CHINA      
Loss Contingencies [Line Items]      
Duty Rate     17.12%aks_DutyRate
/ aks_DefendantProducersAxis
= aks_LeicongIndustrialCompanyMember
/ aks_DutyTypeAxis
= aks_CountervailingDutyMember
/ us-gaap_LitigationCaseAxis
= aks_USTradeCaseNOESMember
/ us-gaap_LitigationStatusAxis
= aks_FinalMember
/ us-gaap_StatementGeographicalAxis
= country_TW
US Trade Case - NOES [Member] | Countervailing Duty [Member] | Final [Member] | All Other Producers [Member] | TAIWAN, PROVINCE OF CHINA      
Loss Contingencies [Line Items]      
Duty Rate     8.80%aks_DutyRate
/ aks_DefendantProducersAxis
= aks_AllOtherProducersMember
/ aks_DutyTypeAxis
= aks_CountervailingDutyMember
/ us-gaap_LitigationCaseAxis
= aks_USTradeCaseNOESMember
/ us-gaap_LitigationStatusAxis
= aks_FinalMember
/ us-gaap_StatementGeographicalAxis
= country_TW
US Trade Case - NOES [Member] | Antidumping Duty [Member] | Final [Member] | CHINA | Minimum [Member]      
Loss Contingencies [Line Items]      
Duty Rate     407.52%aks_DutyRate
/ aks_DutyTypeAxis
= aks_AntidumpingDutyMember
/ us-gaap_LitigationCaseAxis
= aks_USTradeCaseNOESMember
/ us-gaap_LitigationStatusAxis
= aks_FinalMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementGeographicalAxis
= country_CN
US Trade Case - NOES [Member] | Antidumping Duty [Member] | Final [Member] | CHINA | Maximum [Member]      
Loss Contingencies [Line Items]      
Duty Rate     407.52%aks_DutyRate
/ aks_DutyTypeAxis
= aks_AntidumpingDutyMember
/ us-gaap_LitigationCaseAxis
= aks_USTradeCaseNOESMember
/ us-gaap_LitigationStatusAxis
= aks_FinalMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementGeographicalAxis
= country_CN
US Trade Case - NOES [Member] | Antidumping Duty [Member] | Final [Member] | GERMANY | Minimum [Member]      
Loss Contingencies [Line Items]      
Duty Rate     86.29%aks_DutyRate
/ aks_DutyTypeAxis
= aks_AntidumpingDutyMember
/ us-gaap_LitigationCaseAxis
= aks_USTradeCaseNOESMember
/ us-gaap_LitigationStatusAxis
= aks_FinalMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementGeographicalAxis
= country_DE
US Trade Case - NOES [Member] | Antidumping Duty [Member] | Final [Member] | GERMANY | Maximum [Member]      
Loss Contingencies [Line Items]      
Duty Rate     98.84%aks_DutyRate
/ aks_DutyTypeAxis
= aks_AntidumpingDutyMember
/ us-gaap_LitigationCaseAxis
= aks_USTradeCaseNOESMember
/ us-gaap_LitigationStatusAxis
= aks_FinalMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementGeographicalAxis
= country_DE
US Trade Case - NOES [Member] | Antidumping Duty [Member] | Final [Member] | JAPAN | Minimum [Member]      
Loss Contingencies [Line Items]      
Duty Rate     135.59%aks_DutyRate
/ aks_DutyTypeAxis
= aks_AntidumpingDutyMember
/ us-gaap_LitigationCaseAxis
= aks_USTradeCaseNOESMember
/ us-gaap_LitigationStatusAxis
= aks_FinalMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementGeographicalAxis
= country_JP
US Trade Case - NOES [Member] | Antidumping Duty [Member] | Final [Member] | JAPAN | Maximum [Member]      
Loss Contingencies [Line Items]      
Duty Rate     204.79%aks_DutyRate
/ aks_DutyTypeAxis
= aks_AntidumpingDutyMember
/ us-gaap_LitigationCaseAxis
= aks_USTradeCaseNOESMember
/ us-gaap_LitigationStatusAxis
= aks_FinalMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementGeographicalAxis
= country_JP
US Trade Case - NOES [Member] | Antidumping Duty [Member] | Final [Member] | KOREA, REPUBLIC OF | Minimum [Member]      
Loss Contingencies [Line Items]      
Duty Rate     6.88%aks_DutyRate
/ aks_DutyTypeAxis
= aks_AntidumpingDutyMember
/ us-gaap_LitigationCaseAxis
= aks_USTradeCaseNOESMember
/ us-gaap_LitigationStatusAxis
= aks_FinalMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementGeographicalAxis
= country_KR
US Trade Case - NOES [Member] | Antidumping Duty [Member] | Final [Member] | KOREA, REPUBLIC OF | Maximum [Member]      
Loss Contingencies [Line Items]      
Duty Rate     6.88%aks_DutyRate
/ aks_DutyTypeAxis
= aks_AntidumpingDutyMember
/ us-gaap_LitigationCaseAxis
= aks_USTradeCaseNOESMember
/ us-gaap_LitigationStatusAxis
= aks_FinalMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementGeographicalAxis
= country_KR
US Trade Case - NOES [Member] | Antidumping Duty [Member] | Final [Member] | SWEDEN | Minimum [Member]      
Loss Contingencies [Line Items]      
Duty Rate     98.46%aks_DutyRate
/ aks_DutyTypeAxis
= aks_AntidumpingDutyMember
/ us-gaap_LitigationCaseAxis
= aks_USTradeCaseNOESMember
/ us-gaap_LitigationStatusAxis
= aks_FinalMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementGeographicalAxis
= country_SE
US Trade Case - NOES [Member] | Antidumping Duty [Member] | Final [Member] | SWEDEN | Maximum [Member]      
Loss Contingencies [Line Items]      
Duty Rate     126.72%aks_DutyRate
/ aks_DutyTypeAxis
= aks_AntidumpingDutyMember
/ us-gaap_LitigationCaseAxis
= aks_USTradeCaseNOESMember
/ us-gaap_LitigationStatusAxis
= aks_FinalMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementGeographicalAxis
= country_SE
US Trade Case - NOES [Member] | Antidumping Duty [Member] | Final [Member] | TAIWAN, PROVINCE OF CHINA | Minimum [Member]      
Loss Contingencies [Line Items]      
Duty Rate     27.54%aks_DutyRate
/ aks_DutyTypeAxis
= aks_AntidumpingDutyMember
/ us-gaap_LitigationCaseAxis
= aks_USTradeCaseNOESMember
/ us-gaap_LitigationStatusAxis
= aks_FinalMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementGeographicalAxis
= country_TW
US Trade Case - NOES [Member] | Antidumping Duty [Member] | Final [Member] | TAIWAN, PROVINCE OF CHINA | Maximum [Member]      
Loss Contingencies [Line Items]      
Duty Rate     52.23%aks_DutyRate
/ aks_DutyTypeAxis
= aks_AntidumpingDutyMember
/ us-gaap_LitigationCaseAxis
= aks_USTradeCaseNOESMember
/ us-gaap_LitigationStatusAxis
= aks_FinalMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementGeographicalAxis
= country_TW
Double Eagle Steel Coating Company [Member]      
Loss Contingencies [Line Items]      
Equity method investment, ownership percentage (in hundredths) 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= aks_DoubleEagleSteelCoatingCompanyMember		 [1]    
[1] Double Eagle Steel Coating Company (“DESCCO”) is a joint venture between United States Steel Corporation (“US Steel”) and AK Steel that was acquired as part of the Dearborn acquisition. See Note 10 for information on a dispute with US Steel regarding DESCCO.