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Debt Schedule of Debt (Details) (USD $)

3 Months Ended

12 Months Ended

Mar. 31, 2015

Dec. 31, 2014

Feb. 15, 2015

Dec. 31, 2013

Debt Instrument [Line Items]

Total Debt

$ 1,527,000,000ati_TotalDebt

$ 1,526,900,000ati_TotalDebt

Short-term debt and current portion of long-term debt

17,900,000us-gaap_DebtCurrent

17,800,000us-gaap_DebtCurrent

Long-term debt

1,509,100,000us-gaap_LongTermDebtAndCapitalLeaseObligations

1,509,100,000us-gaap_LongTermDebtAndCapitalLeaseObligations

Allegheny Technologies 5.875% Notes due 2023 (a)

Debt Instrument [Line Items]

Long-term Debt, Gross

500,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ati_AlleghenyTechnologiesSeniorNotes5.875Due2023Member

^[1]

500,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ati_AlleghenyTechnologiesSeniorNotes5.875Due2023Member

^[1]

Debt Instrument, Issuer

Allegheny Technologies

Debt Instrument, Maturity Date

Aug. 15, 2023

Aug. 15, 2023

Interest rate

6.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ati_AlleghenyTechnologiesSeniorNotes5.875Due2023Member

6.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ati_AlleghenyTechnologiesSeniorNotes5.875Due2023Member

6.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
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= ati_AlleghenyTechnologiesSeniorNotes5.875Due2023Member

5.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
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= ati_AlleghenyTechnologiesSeniorNotes5.875Due2023Member

Allegheny Technologies 5.95% Notes due 2021

Debt Instrument [Line Items]

Long-term Debt, Gross

500,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ati_Ati2021NotesMember

500,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ati_Ati2021NotesMember

Allegheny Technologies 9.375% Notes due 2019

Debt Instrument [Line Items]

Long-term Debt, Gross

350,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ati_Ati2019NotesMember

350,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ati_Ati2019NotesMember

Allegheny Ludlum 6.95% debentures due 2025

Debt Instrument [Line Items]

Long-term Debt, Gross

150,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ati_AlleghenyLudlumDebenturesDue2025Member

150,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ati_AlleghenyLudlumDebenturesDue2025Member

Interest rate

6.95%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ati_AlleghenyLudlumDebenturesDue2025Member

ATI Ladish Series B 6.14% Notes due 2016 (b)

Debt Instrument [Line Items]

Long-term Debt, Gross

11,700,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ati_LadishSeriesBNotesMember

^[2]

11,900,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ati_LadishSeriesBNotesMember

^[2]

Business Acquisition Purchase Price Allocation Notes Payable and L T Debt

300,000ati_BusinessAcquisitionPurchasePriceAllocationNotesPayableandLTDebt
/ us-gaap_DebtInstrumentAxis
= ati_LadishSeriesBNotesMember

400,000ati_BusinessAcquisitionPurchasePriceAllocationNotesPayableandLTDebt
/ us-gaap_DebtInstrumentAxis
= ati_LadishSeriesBNotesMember

ATI Ladish Series C 6.41% Notes due 2015 (c)

Debt Instrument [Line Items]

Long-term Debt, Gross

10,200,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ati_LadishSeriesCNotesMember

^[3]

10,300,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ati_LadishSeriesCNotesMember

^[3]

Business Acquisition Purchase Price Allocation Notes Payable and L T Debt

200,000ati_BusinessAcquisitionPurchasePriceAllocationNotesPayableandLTDebt
/ us-gaap_DebtInstrumentAxis
= ati_LadishSeriesCNotesMember

300,000ati_BusinessAcquisitionPurchasePriceAllocationNotesPayableandLTDebt
/ us-gaap_DebtInstrumentAxis
= ati_LadishSeriesCNotesMember

Domestic Bank Group $400 million credit facility

Debt Instrument [Line Items]

Maximum borrowing capacity

400,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= ati_DomesticBankGroup400millioncreditagreementMember

Long-term Debt, Gross

0us-gaap_DebtInstrumentCarryingAmount
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= ati_DomesticBankGroup400millioncreditagreementMember

0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ati_DomesticBankGroup400millioncreditagreementMember

Foreign credit facilities

Debt Instrument [Line Items]

Long-term Debt, Gross

0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember

0us-gaap_DebtInstrumentCarryingAmount
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= us-gaap_LineOfCreditMember

Industrial revenue bonds, due through 2020, and other

Debt Instrument [Line Items]

Long-term Debt, Gross

5,100,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_NotesPayableOtherPayablesMember

4,700,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_NotesPayableOtherPayablesMember

ATI Ladish Series B 6.14% Notes due 2016 (b)

Debt Instrument [Line Items]

Debt Instrument, Issuer

ATI Ladish

Debt Instrument, Maturity Date

May 16, 2016

May 16, 2016

Interest rate

6.14%us-gaap_DebtInstrumentInterestRateStatedPercentage
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= ati_LadishSeriesBNotesMember

6.14%us-gaap_DebtInstrumentInterestRateStatedPercentage
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= ati_LadishSeriesBNotesMember

ATI Ladish Series C 6.41% Notes due 2015 (c)

Debt Instrument [Line Items]

Debt Instrument, Issuer

ATI Ladish

Debt Instrument, Maturity Date

Sep. 02, 2015

Sep. 02, 2015

Interest rate

6.41%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= ati_LadishSeriesCNotesMember

6.41%us-gaap_DebtInstrumentInterestRateStatedPercentage
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= ati_LadishSeriesCNotesMember

Allegheny Technologies 5.95% Notes due 2021

Debt Instrument [Line Items]

Debt Instrument, Issuer

Allegheny Technologies

Debt Instrument, Maturity Date

Jan. 15, 2021

Jan. 15, 2021

Interest rate

5.95%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= ati_Ati2021NotesMember

5.95%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= ati_Ati2021NotesMember

Industrial revenue bonds, due through 2020, and other

Debt Instrument [Line Items]

Debt Instrument, Maturity Date Range, End

Jan. 01, 2020

Jan. 01, 2020

Allegheny Ludlum 6.95% debentures due 2025

Debt Instrument [Line Items]

Debt Instrument, Issuer

Allegheny Ludlum

Debt Instrument, Maturity Date

Dec. 15, 2025

Dec. 15, 2025

Interest rate

6.95%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= ati_AlleghenyLudlumDebenturesDue2025Member

Allegheny Technologies 9.375% Notes due 2019

Debt Instrument [Line Items]

Debt Instrument, Issuer

Allegheny Technologies

Debt Instrument, Maturity Date

Jun. 01, 2019

Jun. 01, 2019

Interest rate

9.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= ati_Ati2019NotesMember

9.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= ati_Ati2019NotesMember

Domestic Bank Group $400 million credit facility

Debt Instrument [Line Items]

Maximum borrowing capacity

$ 400,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= ati_DomesticBankGroup400millioncreditagreementMember

[1]	Bearing interest at 6.375% effective February 15, 2015.
[2]	Includes fair value adjustments of $0.3 million at March 31, 2015 and $0.4 million at December 31, 2014.
[3]	Includes fair value adjustments of $0.2 million at March 31, 2015 and $0.3 million at December 31, 2014.

X

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The amount of acquisition cost of a business combination allocated to notes payables and long-term debt above or below the face amount of the debt assumed from the acquired entity.

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Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Identification of the contractual issuer of the debt instrument (for example, a subsidiary of the reporting entity).

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Latest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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