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Debt (Details) In Millions, unless otherwise specified | 6 Months Ended |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  | 3 Months Ended | 6 Months Ended |  | 3 Months Ended
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Jun. 30, 2013 USD ($) | Jun. 30, 2012 USD ($) | Dec. 31, 2012 USD ($) | Jun. 30, 2013 [LineOfCreditMember] USD ($) | Dec. 31, 2012 [LineOfCreditMember] USD ($) | Jun. 30, 2013 [Ati2019NotesMember] USD ($) | Jun. 30, 2013 [Ati2019NotesMember] USD ($) | Dec. 31, 2012 [Ati2019NotesMember] USD ($) | Jun. 30, 2013 [DomesticBankGroup400MillionUnsecuredCreditAgreementMember] USD ($) | Dec. 31, 2012 [DomesticBankGroup400MillionUnsecuredCreditAgreementMember] USD ($) | Jun. 30, 2013 [AlleghenyLudlumDebenturesDue2025Member] USD ($) | Jun. 30, 2013 [AlleghenyLudlumDebenturesDue2025Member] USD ($) | Dec. 31, 2012 [AlleghenyLudlumDebenturesDue2025Member] USD ($) | Jun. 30, 2013 [NotesPayableOtherPayablesMember] USD ($) | Jun. 30, 2013 [NotesPayableOtherPayablesMember] USD ($) | Dec. 31, 2012 [NotesPayableOtherPayablesMember] USD ($) | Jun. 30, 2013 [ConvertibleDebtMember] USD ($) | Jun. 30, 2013 [ConvertibleDebtMember] USD ($) | Dec. 31, 2012 [ConvertibleDebtMember] USD ($) | Jun. 30, 2013 [Ati2021NotesMember] USD ($) | Jun. 30, 2013 [Ati2021NotesMember] USD ($) | Dec. 31, 2012 [Ati2021NotesMember] USD ($) | Jun. 30, 2013 [LadishSeriesCNotesMember] USD ($) | Jun. 30, 2013 [LadishSeriesCNotesMember] USD ($) | Dec. 31, 2012 [LadishSeriesCNotesMember] USD ($) | Jun. 30, 2013 [LadishSeriesBNotesMember] USD ($) | Jun. 30, 2013 [LadishSeriesBNotesMember] USD ($) | Dec. 31, 2012 [LadishSeriesBNotesMember] USD ($) | Jun. 30, 2013 [SeperateletterOfCreditFacilityMember] USD ($) | Jun. 30, 2013 [DomesticBankGroup400MillionUnsecuredCreditAgreementMember] USD ($) | Jun. 30, 2013 [DomesticBankGroup400MillionUnsecuredCreditAgreementMember] USD ($) | Dec. 31, 2012 [DomesticBankGroup400MillionUnsecuredCreditAgreementMember] USD ($) | Jun. 30, 2013 [StalRevolvingCreditFacilityMember] USD ($) | Jun. 30, 2013 [StalRevolvingCreditFacilityMember] CNY
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line Of Credit Facility Covenant Terms |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | As amended, the facility requires the Company to maintain a leverage ratio (consolidated total indebtedness divided by consolidated earnings before interest, taxes and depreciation and amortization for the four prior fiscal quarters) of not greater than 4.0 beginning with the quarter ended June 30, 2013. The maximum leverage ratio is reduced to 3.75 beginning with the quarter ended March 31, 2015 and further reduced to 3.50 beginning with the quarter ended June 30, 2015 and for each fiscal quarter thereafter. The credit facility continues to require that the company maintain an interest coverage ratio (consolidated earnings before interest and taxes divided by interest expense) of not less than 2.0. |  |  |
Line Of Credit Facility Covenant Compliance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | At June 30, 2013, the leverage ratio was 3.29 and the interest coverage ratio was 4.09. |  |  |
Line Of Credit Facility Amount Outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 32.0 | $ 4.0 | $ 4.0 |  | $ 0 |
Line Of Credit Facility Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 400.0 | 400.0 | 400.0 | 33.0 | 205.0
Line of Credit Facility, Expiration Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | May 31, 2018 |  |  | Aug. 01, 2014 | Aug. 01, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Issuer |  |  |  |  |  |  | Allegheny Technologies Allegheny Technologies |  | Domestic Bank Group Domestic Bank Group |  |  | Allegheny Ludlum Allegheny Ludlum |  |  | Industrial revenue bonds, due through 2020, and other Industrial revenue bonds, due through 2020, and other |  |  | Allegheny Technologies Allegheny Technologies |  |  | Allegheny Technologies Allegheny Technologies |  |  | ATI Ladish ATI Ladish |  |  | ATI Ladish ATI Ladish |  |  |  |  |  |  |
Debt Instrument Carrying Amount |  |  |  | 14.5 | 14.2 | 350.0 | 350.0 | 350.0 | 0 | 0 | 150.0 | 150.0 | 150.0 | 6.6 | 6.6 | 6.1 | 402.5 | 402.5 | 402.5 | 500.0 | 500.0 | 500.0 | 31.7 | 31.7 | 32.5 | 18.6 | 18.6 | 24.8 |  |  |  |  |  |
Debt Instrument Maturity Date |  |  |  |  |  | Jun. 01, 2019 |  | Jun. 01, 2019 |  |  | Dec. 15, 2025 |  | Dec. 15, 2025 |  |  |  | Jun. 01, 2014 |  | Jun. 01, 2014 | Jan. 15, 2021 |  | Jan. 15, 2021 | Sep. 02, 2015 |  | Sep. 02, 2015 | May 16, 2016 |  | May 16, 2016 |  |  |  |  |  |
Debt Instrument Maturity Date Range End |  |  |  |  |  |  |  |  |  |  |  |  |  | Jan. 01, 2020 |  | Jan. 01, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Interest Rate Stated Percentage |  |  |  |  |  | 9.375% | 9.375% | 9.375% |  |  | 6.95% | 6.95% | 6.95% |  |  |  | 4.25% | 4.25% | 4.25% | 5.95% | 5.95% | 5.95% | 6.41% | 6.41% | 6.41% | 6.14% | 6.14% | 6.14% |  |  |  |  |  |
Total short-term and long-term debt | 1,473.9 |  | 1,480.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Current | 420.3 |  | 17.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt | 1,053.6 |  | 1,463.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments on long-term debt and capital leases | 5.9 | 5.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition Purchase Price Allocation Notes Payableand L T Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.7 |  | $ 2.5 | $ 1.4 |  | $ 1.9 |  |  |  |  |  |

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