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Debt Narrative (Details)	3 Months Ended								3 Months Ended
	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			$ 500,000,000us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = ati_AlleghenyTechnologiesSeniorNotes5.875Due2023Member	[1]		$ 500,000,000us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = ati_AlleghenyTechnologiesSeniorNotes5.875Due2023Member	[1]		$ 0us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = ati_DomesticBankGroup400millioncreditagreementMember	$ 0us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = ati_DomesticBankGroup400millioncreditagreementMember
Maximum borrowing capacity									400,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = ati_DomesticBankGroup400millioncreditagreementMember			20,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = ati_StalRevolvingCreditFacilityMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember	125,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = ati_StalRevolvingCreditFacilityMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Amount utilized to support the issuance of letters of credit									4,700,000us-gaap_LineOfCredit / us-gaap_DebtInstrumentAxis = ati_DomesticBankGroup400millioncreditagreementMember
Average borrowings during period									73,700,000us-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									50,000,000ati_AmountofCashonHandUsedtoReducetheIndebtnessFigureusedintheLeverageRatioCalculation / us-gaap_DebtInstrumentAxis = ati_DomesticBankGroup400millioncreditagreementMember
Maximum leverage ratio for the quarter ended March 31, 2015									5.0ati_DebtInstrumentCovenantMaximumLeverageRatioPeriodOne / us-gaap_DebtInstrumentAxis = ati_DomesticBankGroup400millioncreditagreementMember
Maximum leverage ratio for the quarter ended June 30, 2015									4.50ati_DebtInstrumentCovenantMaximumLeverageRatioPeriodTwo / us-gaap_DebtInstrumentAxis = ati_DomesticBankGroup400millioncreditagreementMember
Maximum leverage ratio for the quarter ended September 30, 2015									3.75ati_DebtInstrumentCovenantMaximumLeverageRatioPeriodThree / us-gaap_DebtInstrumentAxis = ati_DomesticBankGroup400millioncreditagreementMember
Maximum leverage ratio for the quarter ended December 31, 2015 and for each fiscal quarter thereafter									3.50ati_DebtInstrumentCovenantMaximumLeverageRatioPeriodFour / us-gaap_DebtInstrumentAxis = ati_DomesticBankGroup400millioncreditagreementMember
Minimum interest coverage ratio for the quarter ended March 31, 2015									2.50ati_DebtInstrumentCovenantMinimumInterestCoverageRatioPeriodOne / us-gaap_DebtInstrumentAxis = ati_DomesticBankGroup400millioncreditagreementMember
Minimum interest coverage ratio for the quarter ended June 30, 2015									3.00ati_DebtInstrumentCovenantMinimumInterestCoverageRatioPeriodTwo / us-gaap_DebtInstrumentAxis = ati_DomesticBankGroup400millioncreditagreementMember
Minimum interest coverage ratio for the quarter ended September 30, 2015									3.25ati_DebtInstrumentCovenantMinimumInterestCoverageRatioPeriodThree / us-gaap_DebtInstrumentAxis = ati_DomesticBankGroup400millioncreditagreementMember
Minimum interest coverage ratio for the quarter ended December 31, 2015 and for each fiscal quarter thereafter									3.50ati_DebtInstrumentCovenantMinimumInterestCoverageRatioPeriodFour / us-gaap_DebtInstrumentAxis = ati_DomesticBankGroup400millioncreditagreementMember
Actual leverage ratio									3.73ati_DebtInstrumentCovenantLeverageRatio / us-gaap_DebtInstrumentAxis = ati_DomesticBankGroup400millioncreditagreementMember
Actual interest coverage ratio									3.26ati_DebtInstrumentCovenantInterestCoverageRatio / us-gaap_DebtInstrumentAxis = ati_DomesticBankGroup400millioncreditagreementMember
Letters of credit outstanding											32,000,000us-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	$ 300,000us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities	$ 100,000us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities
[1] Bearing interest at 6.375% effective February 15, 2015.

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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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