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Long-term Debt and Other Financing Redemption Percentage for 2022 Notes (Details3) (Senior Notes Due April 2022 [Member])	9 Months Ended
	Sep. 30, 2012
Debt Instrument [Line Items]
Debt Instrument, Call Feature	At any time prior to April 1, 2017, AK Steel may redeem the 2022 Notes, in whole or in part, at a redemption price equal to par, plus accrued and unpaid interest and a “make-whole” premium calculated in accordance with the indentures governing the 2022 Notes. In addition, AK Steel may redeem the 2022 Notes, in whole or in part, at any time on or after April 1, 2017, at the redemption price for such notes, set forth below as a percentage of the face amount, plus accrued and unpaid interest to the redemption date, if redeemed during the twelve-month period commencing on April 1 of the years indicated below:
April 2017 [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Percentage	104.188%
April 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Percentage	102.792%
April 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Percentage	101.396%
April 2020 and Thereafter [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Percentage	100.00%

Description of a feature that permits the issuer of the debt to repay or convert it before the stated maturity date (early retirement date). The description may include such items as the call price, the period that the issuer can call the debt, including the earliest call date, and other significant terms of the call feature, which may include the debt holders' ability to convert the debt to equity if the call option is exercised and contingent events that trigger the issuer's ability to call the debt.

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