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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
	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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