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Debt - Narrative (Details)
 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Jul. 12, 2013
Allegheny Technologies $500 million 5.875% Senior Notes due 2023 [Member]
USD ($)
Dec. 31, 2014
Allegheny Technologies $500 million 5.875% Senior Notes due 2023 [Member]
USD ($)
Dec. 31, 2013
Allegheny Technologies $500 million 5.875% Senior Notes due 2023 [Member]
USD ($)
Aug. 15, 2014
Allegheny Technologies $500 million 5.875% Senior Notes due 2023 [Member]
Jun. 02, 2014
Allegheny Technologies $402.5 million 4.25% Convertible Senior Notes due 2014 [Member]
USD ($)
Jun. 01, 2014
Allegheny Technologies $402.5 million 4.25% Convertible Senior Notes due 2014 [Member]
USD ($)
Dec. 31, 2014
Allegheny Technologies $402.5 million 4.25% Convertible Senior Notes due 2014 [Member]
USD ($)
Dec. 31, 2013
Allegheny Technologies $402.5 million 4.25% Convertible Senior Notes due 2014 [Member]
USD ($)
Dec. 31, 2014
Ladish Series B 6.14% Notes due 2016 [Member]
USD ($)
Dec. 31, 2013
Ladish Series B 6.14% Notes due 2016 [Member]
USD ($)
Dec. 31, 2014
Ladish Series C 6.41% Notes due 2015 [Member]
USD ($)
Dec. 31, 2013
Ladish Series C 6.41% Notes due 2015 [Member]
USD ($)
Dec. 31, 2014
Domestic Bank Group $400 million unsecured credit agreement [Member]
USD ($)
Dec. 31, 2013
Domestic Bank Group $400 million unsecured credit agreement [Member]
USD ($)
Dec. 31, 2014
Seperate Letter of Credit Facility [Member]
USD ($)
Dec. 31, 2014
STAL Revolving Credit Facility [Member]
Dec. 31, 2013
STAL Revolving Credit Facility [Member]
CNY
Dec. 31, 2014
Minimum [Member]
Domestic Bank Group $400 million unsecured credit agreement [Member]
Dec. 31, 2014
Minimum [Member]
Domestic Bank Group $400 million unsecured credit agreement [Member]
London Interbank Offered Rate (LIBOR) [Member]
Dec. 31, 2014
Minimum [Member]
Domestic Bank Group $400 million unsecured credit agreement [Member]
Prime Lending Rate [Member]
Dec. 31, 2014
Maximum [Member]
Domestic Bank Group $400 million unsecured credit agreement [Member]
Dec. 31, 2014
Maximum [Member]
Domestic Bank Group $400 million unsecured credit agreement [Member]
London Interbank Offered Rate (LIBOR) [Member]
Dec. 31, 2014
Maximum [Member]
Domestic Bank Group $400 million unsecured credit agreement [Member]
Prime Lending Rate [Member]
Interest Costs Incurred [Abstract]                                                    
Interest expense $ 109,800,000us-gaap_InterestExpenseDebt $ 66,000,000us-gaap_InterestExpenseDebt $ 72,400,000us-gaap_InterestExpenseDebt                                              
Interest costs capitalized 5,300,000us-gaap_InterestCostsCapitalized 45,700,000us-gaap_InterestCostsCapitalized 24,500,000us-gaap_InterestCostsCapitalized                                              
Interest costs paid 113,200,000us-gaap_InterestPaid 110,600,000us-gaap_InterestPaid 96,500,000us-gaap_InterestPaid                                              
Interest income 1,100,000us-gaap_InvestmentIncomeInterest 800,000us-gaap_InvestmentIncomeInterest 800,000us-gaap_InvestmentIncomeInterest                                              
Long-term Debt, Fiscal Year Maturity [Abstract]                                                    
2015 17,800,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths                                                  
2016 7,700,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo                                                  
2017 500,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree                                                  
2018 200,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour                                                  
2019 350,100,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive                                                  
Debt Instrument [Line Items]                                                    
Debt instrument carrying amount       500,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= ati_ATI2023NotesMember		 500,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= ati_ATI2023NotesMember		 [1] 500,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= ati_ATI2023NotesMember		 [1]       0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		 402,500,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		 11,900,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= ati_LadishSeriesBNotesMember		 [2] 18,200,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= ati_LadishSeriesBNotesMember		 [2] 10,300,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= ati_LadishSeriesCNotesMember		 [3] 21,100,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= ati_LadishSeriesCNotesMember		 [3]                      
Debt instrument interest rate stated percentage           5.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= ati_ATI2023NotesMember		 6.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= ati_ATI2023NotesMember		       4.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		 6.14%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= ati_LadishSeriesBNotesMember		 [3] 6.14%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= ati_LadishSeriesBNotesMember		 [3] 6.41%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= ati_LadishSeriesCNotesMember		 [2] 6.41%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= ati_LadishSeriesCNotesMember		 [2]                      
Repayments of Convertible Debt               397,500,000us-gaap_RepaymentsOfConvertibleDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		                                    
Debt instrument maturity date       Aug. 15, 2023                                            
Payments of debt issuance costs 1,200,000us-gaap_PaymentsOfDebtIssuanceCosts 5,200,000us-gaap_PaymentsOfDebtIssuanceCosts 0us-gaap_PaymentsOfDebtIssuanceCosts     5,200,000us-gaap_PaymentsOfDebtIssuanceCosts
/ us-gaap_LongtermDebtTypeAxis
= ati_ATI2023NotesMember		                   1,200,000us-gaap_PaymentsOfDebtIssuanceCosts
/ us-gaap_LineOfCreditFacilityAxis
= ati_DomesticBankGroup400MillionUnsecuredCreditAgreementMember		                    
Amortization period of debt issuance costs         10 years                                          
Line of credit maximum borrowing capacity                               400,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= ati_DomesticBankGroup400MillionUnsecuredCreditAgreementMember		       205,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= ati_StalRevolvingCreditFacilityMember		            
Line of credit borrowing capacity increase limit                               100,000,000ati_LineofCreditFacilityBorrowingCapacityIncreaseLimit
/ us-gaap_LineOfCreditFacilityAxis
= ati_DomesticBankGroup400MillionUnsecuredCreditAgreementMember		                    
Amount of cash on hand used to reduce the indebtness figure used in the leverage ratio calculation                               50,000,000ati_AmountofCashonHandUsedtoReducetheIndebtnessFigureusedintheLeverageRatioCalculation
/ us-gaap_LineOfCreditFacilityAxis
= ati_DomesticBankGroup400MillionUnsecuredCreditAgreementMember		                    
Maximum leverage ratio quarter ended March 31, 2015                               5.75ati_DebtInstrumentCovenantMaximumLeverageRatioPeriodOne
/ us-gaap_LineOfCreditFacilityAxis
= ati_DomesticBankGroup400MillionUnsecuredCreditAgreementMember		                    
Maximum leverage ratio quarter ended June 30, 2015                               5.00ati_DebtInstrumentCovenantMaximumLeverageRatioPeriodTwo
/ us-gaap_LineOfCreditFacilityAxis
= ati_DomesticBankGroup400MillionUnsecuredCreditAgreementMember		                    
Maximum leverage ratio quarter ended September 30, 2015                               4.50ati_DebtInstrumentCovenantMaximumLeverageRatioPeriodThree
/ us-gaap_LineOfCreditFacilityAxis
= ati_DomesticBankGroup400MillionUnsecuredCreditAgreementMember		                    
Maximum leverage ratio quarter ended December 31, 2015                               3.75ati_DebtInstrumentCovenantMaximumLeverageRatioPeriodFour
/ us-gaap_LineOfCreditFacilityAxis
= ati_DomesticBankGroup400MillionUnsecuredCreditAgreementMember		                    
Debt Instrument, Covenant, Maximum Leverage Ratio, Period Five                               3.50ati_DebtInstrumentCovenantMaximumLeverageRatioPeriodFive
/ us-gaap_LineOfCreditFacilityAxis
= ati_DomesticBankGroup400MillionUnsecuredCreditAgreementMember		                    
Minimum interest coverage ratio quarter ended March 31, 2015                               2.0ati_DebtInstrumentCovenantMinimumInterestCoverageRatioPeriodOne
/ us-gaap_LineOfCreditFacilityAxis
= ati_DomesticBankGroup400MillionUnsecuredCreditAgreementMember		                    
Minimum interest coverage ratio quarter ended June 30, 2015                               2.50ati_DebtInstrumentCovenantMinimumInterestCoverageRatioPeriodTwo
/ us-gaap_LineOfCreditFacilityAxis
= ati_DomesticBankGroup400MillionUnsecuredCreditAgreementMember		                    
Minimum interest coverage ratio quarter ended September 30, 2015                               3.00ati_DebtInstrumentCovenantMinimumInterestCoverageRatioPeriodThree
/ us-gaap_LineOfCreditFacilityAxis
= ati_DomesticBankGroup400MillionUnsecuredCreditAgreementMember		                    
Minimum interest coverage ratio quarter ended December 31, 2015                               3.25ati_DebtInstrumentCovenantMinimumInterestCoverageRatioPeriodFour
/ us-gaap_LineOfCreditFacilityAxis
= ati_DomesticBankGroup400MillionUnsecuredCreditAgreementMember		                    
Debt Instrument, Covenant, Minimum Interest Coverage Ratio, Period Five                               3.50ati_DebtInstrumentCovenantMinimumInterestCoverageRatioPeriodFive
/ us-gaap_LineOfCreditFacilityAxis
= ati_DomesticBankGroup400MillionUnsecuredCreditAgreementMember		                    
Leverage ratio                               4.2ati_DebtInstrumentCovenantLeverageRatio
/ us-gaap_LineOfCreditFacilityAxis
= ati_DomesticBankGroup400MillionUnsecuredCreditAgreementMember		                    
Interest coverage ratio                               2.79ati_DebtInstrumentCovenantInterestCoverageRatio
/ us-gaap_LineOfCreditFacilityAxis
= ati_DomesticBankGroup400MillionUnsecuredCreditAgreementMember		                    
Line of credit facility amount outstanding                               0us-gaap_LineOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= ati_DomesticBankGroup400MillionUnsecuredCreditAgreementMember		 0us-gaap_LineOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= ati_DomesticBankGroup400MillionUnsecuredCreditAgreementMember		 32,000,000us-gaap_LineOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= ati_SeperateletterOfCreditFacilityMember		                
Credit facility amount used to support letters of credit                               4,700,000ati_LineofCreditFacilityAmountOutstandingIncludingLettersofCredit
/ us-gaap_LineOfCreditFacilityAxis
= ati_DomesticBankGroup400MillionUnsecuredCreditAgreementMember		                    
Credit facility sublimit for letters of credit                               200,000,000ati_Sublimitforlettersofcredit
/ us-gaap_LineOfCreditFacilityAxis
= ati_DomesticBankGroup400MillionUnsecuredCreditAgreementMember		                    
Variable rate spread                                           1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LineOfCreditFacilityAxis
= ati_DomesticBankGroup400MillionUnsecuredCreditAgreementMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		 0.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LineOfCreditFacilityAxis
= ati_DomesticBankGroup400MillionUnsecuredCreditAgreementMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_PrimeRateMember		   2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LineOfCreditFacilityAxis
= ati_DomesticBankGroup400MillionUnsecuredCreditAgreementMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LineOfCreditFacilityAxis
= ati_DomesticBankGroup400MillionUnsecuredCreditAgreementMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_PrimeRateMember
Letter of credit fee                                         1.25%ati_LineofCreditFacilityLetterofCreditFee
/ us-gaap_LineOfCreditFacilityAxis
= ati_DomesticBankGroup400MillionUnsecuredCreditAgreementMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		     2.50%ati_LineofCreditFacilityLetterofCreditFee
/ us-gaap_LineOfCreditFacilityAxis
= ati_DomesticBankGroup400MillionUnsecuredCreditAgreementMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Facility fee                                         0.18%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_LineOfCreditFacilityAxis
= ati_DomesticBankGroup400MillionUnsecuredCreditAgreementMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		     0.35%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_LineOfCreditFacilityAxis
= ati_DomesticBankGroup400MillionUnsecuredCreditAgreementMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Convertible notes, Amount converted                 5,000,000us-gaap_DebtConversionConvertedInstrumentAmount1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		                                  
Convertible notes, Shares issued                 120,476us-gaap_DebtConversionConvertedInstrumentSharesIssued1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		                                  
Convertible debt conversion rate in shares of stock (per $1,000 of notes)                 23.9263us-gaap_DebtInstrumentConvertibleConversionRatio1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		                                  
Conversion price of convertible notes                     $ 41.795us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		                              
Outstanding balance                       $ 11,500,000ati_DebtInstrumentOutstandingFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= ati_LadishSeriesBNotesMember		   $ 10,000,000ati_DebtInstrumentOutstandingFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= ati_LadishSeriesCNotesMember		                        
Funded debt limit maximum percent of capitalization                           60.00%ati_CovenantFundedDebtLimitMaximumPercentofCapitalization
/ us-gaap_LongtermDebtTypeAxis
= ati_LadishSeriesCNotesMember		                        
Joint venture ownership percentage                                     60.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_LineOfCreditFacilityAxis
= ati_StalRevolvingCreditFacilityMember		              
[1] earing interest at 6.125% effective August 15, 2014.
[2] Includes fair value adjustments of $0.4 million and $1.0 million at December 31, 2014 and December 31, 2013, respectively.
[3] Includes fair value adjustments of $0.3 million and $1.1 million at December 31, 2014 and December 31, 2013, respectively.