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Debt (Details)
In Millions, unless otherwise specified
3 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended
Mar. 31, 2013
USD ($)
Mar. 31, 2012
USD ($)
Dec. 31, 2012
USD ($)
Mar. 31, 2013
[LineOfCreditMember]
USD ($)
Dec. 31, 2012
[LineOfCreditMember]
USD ($)
Mar. 31, 2013
[Ati2019NotesMember]
USD ($)
Dec. 31, 2012
[Ati2019NotesMember]
USD ($)
Mar. 31, 2013
[DomesticBankGroup400MillionUnsecuredCreditAgreementMember]
USD ($)
Dec. 31, 2012
[DomesticBankGroup400MillionUnsecuredCreditAgreementMember]
USD ($)
Mar. 31, 2013
[AlleghenyLudlumDebenturesDue2025Member]
USD ($)
Dec. 31, 2012
[AlleghenyLudlumDebenturesDue2025Member]
USD ($)
Mar. 31, 2013
[NotesPayableOtherPayablesMember]
USD ($)
Dec. 31, 2012
[NotesPayableOtherPayablesMember]
USD ($)
Mar. 31, 2013
[ConvertibleDebtMember]
USD ($)
Dec. 31, 2012
[ConvertibleDebtMember]
USD ($)
Mar. 31, 2013
[Ati2021NotesMember]
USD ($)
Dec. 31, 2012
[Ati2021NotesMember]
USD ($)
Mar. 31, 2013
[LadishSeriesCNotesMember]
USD ($)
Dec. 31, 2012
[LadishSeriesCNotesMember]
USD ($)
Mar. 31, 2013
[LadishSeriesBNotesMember]
USD ($)
Dec. 31, 2012
[LadishSeriesBNotesMember]
USD ($)
Mar. 31, 2013
[SeperateletterOfCreditFacilityMember]
USD ($)
Mar. 31, 2013
[DomesticBankGroup400MillionUnsecuredCreditAgreementMember]
USD ($)
Dec. 31, 2012
[DomesticBankGroup400MillionUnsecuredCreditAgreementMember]
USD ($)
Mar. 31, 2013
[StalRevolvingCreditFacilityMember]
USD ($)
Mar. 31, 2013
[StalRevolvingCreditFacilityMember]
CNY
Line Of Credit Facility [Line Items]                                                    
Line Of Credit Facility Covenant Terms                                             This credit facility requires the Company to maintain a leverage ratio (consolidated total indebtedness net of cash on hand in excess of $50 million, divided by consolidated earnings before interest, taxes, depreciation and amortization, and non-cash pension expense) of not greater than 3.25, and maintain an interest coverage ratio (consolidated earnings before interest, taxes, and non-cash pension expense divided by interest expense) of not less than 2.0.      
Line Of Credit Facility Covenant Compliance                                             For the three months ended March 31, 2013, the leverage ratio was 2.65, and the interest coverage ratio was 5.06.      
Line Of Credit Facility Amount Outstanding                                           $ 32.0 $ 4.0      
Line Of Credit Facility Maximum Borrowing Capacity                                             400.0 400.0 33.0 205.0
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       13.8 14.2 350.0 350.0 0 0 150.0 150.0 6.1 6.1 402.5 402.5 500.0 500.0 32.1 32.5 24.6 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%     6.95% 6.95%     4.25% 4.25% 5.95% 5.95% 6.41% 6.41% 6.14% 6.14%          
Total short-term and long-term debt 1,479.1   1,480.1                                              
Debt Current 17.1   17.1                                              
Long-term debt 1,462.0   1,463.0                                              
Payments on long-term debt and capital leases 0.1 0                                                
Business Acquisition Purchase Price Allocation Notes Payableand L T Debt                                   $ 2.1 $ 2.5 $ 1.7 $ 1.9