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Debt Narrative (Details) | 3 Months Ended |  |  |  |  | 3 Months Ended |  |  |  |
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Mar. 31, 2015 USD ($) | Mar. 31, 2014 USD ($) | Mar. 31, 2015 Allegheny Technologies 5.875% Notes due 2023 (a) USD ($) | Feb. 15, 2015 Allegheny Technologies 5.875% Notes due 2023 (a) | Dec. 31, 2014 Allegheny Technologies 5.875% Notes due 2023 (a) USD ($) | Dec. 31, 2013 Allegheny Technologies 5.875% Notes due 2023 (a) | Mar. 31, 2015 Domestic Bank Group $400 million credit facility USD ($) | Dec. 31, 2014 Domestic Bank Group $400 million credit facility USD ($) | Mar. 31, 2015 Seperateletter of Credit Facility USD ($) | Apr. 30, 2015 STAL Revolving Credit Facility Subsequent Event USD ($) | Apr. 30, 2015 STAL Revolving Credit Facility Subsequent Event CNY | Mar. 31, 2015 STAL Precision Stainless Steel Company Limited
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 6.375%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = ati_AlleghenyTechnologiesSeniorNotes5.875Due2023Member |  | 6.375%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = ati_AlleghenyTechnologiesSeniorNotes5.875Due2023Member | 6.125%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = ati_AlleghenyTechnologiesSeniorNotes5.875Due2023Member |  | 5.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = ati_AlleghenyTechnologiesSeniorNotes5.875Due2023Member |  |  |  |  |  |
Long-term Debt, Gross |  |  | $ 500,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = ati_AlleghenyTechnologiesSeniorNotes5.875Due2023Member | [1] |  | $ 500,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = ati_AlleghenyTechnologiesSeniorNotes5.875Due2023Member | [1] |  | $ 0 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = ati_DomesticBankGroup400millioncreditagreementMember | $ 0 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = ati_DomesticBankGroup400millioncreditagreementMember |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  | 400,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = ati_DomesticBankGroup400millioncreditagreementMember |  |  | 20,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = ati_StalRevolvingCreditFacilityMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | 125,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = ati_StalRevolvingCreditFacilityMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Amount utilized to support the issuance of letters of credit |  |  |  |  |  |  |  |  | 4,700,000 us-gaap_LineOfCredit / us-gaap_DebtInstrumentAxis = ati_DomesticBankGroup400millioncreditagreementMember |  |  |  |  |
Average borrowings during period |  |  |  |  |  |  |  |  | 73,700,000 us-gaap_LineOfCreditFacilityAverageOutstandingAmount / us-gaap_DebtInstrumentAxis = ati_DomesticBankGroup400millioncreditagreementMember |  |  |  |  |
Line of Credit Facility, Interest Rate During Period |  |  |  |  |  |  |  |  | 1.90%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod / us-gaap_DebtInstrumentAxis = ati_DomesticBankGroup400millioncreditagreementMember |  |  |  |  |
Amount of Cash on Hand Used to Reduce the Indebtness Figure used in the Leverage Ratio Calculation |  |  |  |  |  |  |  |  | 50,000,000 ati_AmountofCashonHandUsedtoReducetheIndebtnessFigureusedintheLeverageRatioCalculation / us-gaap_DebtInstrumentAxis = ati_DomesticBankGroup400millioncreditagreementMember |  |  |  |  |
Maximum leverage ratio for the quarter ended March 31, 2015 |  |  |  |  |  |  |  |  | 5.0 ati_DebtInstrumentCovenantMaximumLeverageRatioPeriodOne / us-gaap_DebtInstrumentAxis = ati_DomesticBankGroup400millioncreditagreementMember |  |  |  |  |
Maximum leverage ratio for the quarter ended June 30, 2015 |  |  |  |  |  |  |  |  | 4.50 ati_DebtInstrumentCovenantMaximumLeverageRatioPeriodTwo / us-gaap_DebtInstrumentAxis = ati_DomesticBankGroup400millioncreditagreementMember |  |  |  |  |
Maximum leverage ratio for the quarter ended September 30, 2015 |  |  |  |  |  |  |  |  | 3.75 ati_DebtInstrumentCovenantMaximumLeverageRatioPeriodThree / us-gaap_DebtInstrumentAxis = ati_DomesticBankGroup400millioncreditagreementMember |  |  |  |  |
Maximum leverage ratio for the quarter ended December 31, 2015 and for each fiscal quarter thereafter |  |  |  |  |  |  |  |  | 3.50 ati_DebtInstrumentCovenantMaximumLeverageRatioPeriodFour / us-gaap_DebtInstrumentAxis = ati_DomesticBankGroup400millioncreditagreementMember |  |  |  |  |
Minimum interest coverage ratio for the quarter ended March 31, 2015 |  |  |  |  |  |  |  |  | 2.50 ati_DebtInstrumentCovenantMinimumInterestCoverageRatioPeriodOne / us-gaap_DebtInstrumentAxis = ati_DomesticBankGroup400millioncreditagreementMember |  |  |  |  |
Minimum interest coverage ratio for the quarter ended June 30, 2015 |  |  |  |  |  |  |  |  | 3.00 ati_DebtInstrumentCovenantMinimumInterestCoverageRatioPeriodTwo / us-gaap_DebtInstrumentAxis = ati_DomesticBankGroup400millioncreditagreementMember |  |  |  |  |
Minimum interest coverage ratio for the quarter ended September 30, 2015 |  |  |  |  |  |  |  |  | 3.25 ati_DebtInstrumentCovenantMinimumInterestCoverageRatioPeriodThree / us-gaap_DebtInstrumentAxis = ati_DomesticBankGroup400millioncreditagreementMember |  |  |  |  |
Minimum interest coverage ratio for the quarter ended December 31, 2015 and for each fiscal quarter thereafter |  |  |  |  |  |  |  |  | 3.50 ati_DebtInstrumentCovenantMinimumInterestCoverageRatioPeriodFour / us-gaap_DebtInstrumentAxis = ati_DomesticBankGroup400millioncreditagreementMember |  |  |  |  |
Actual leverage ratio |  |  |  |  |  |  |  |  | 3.73 ati_DebtInstrumentCovenantLeverageRatio / us-gaap_DebtInstrumentAxis = ati_DomesticBankGroup400millioncreditagreementMember |  |  |  |  |
Actual interest coverage ratio |  |  |  |  |  |  |  |  | 3.26 ati_DebtInstrumentCovenantInterestCoverageRatio / us-gaap_DebtInstrumentAxis = ati_DomesticBankGroup400millioncreditagreementMember |  |  |  |  |
Letters of credit outstanding |  |  |  |  |  |  |  |  |  |  | 32,000,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_DebtInstrumentAxis = ati_SeperateletterOfCreditFacilityMember |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  |  |  |  |  |  |  |  |  |  |  | 60.00%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ati_STALPrecisionStainlessSteelCompanyLimitedMember
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities | $ 300,000 us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities | $ 100,000 us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities |  |  |  |  |  |  |  |  |  |  |  |
[1] | Bearing interest at 6.375% effective February 15, 2015.

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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