false0001018963December 312023Q3ATI Inc.ATI Inc.9/9/20279/9/20278/15/203012/15/202512/15/202512/1/202712/1/202710/1/202910/1/202910/1/203110/1/20316/15/20256/15/2025.064574514000010189632023-01-012023-09-3000010189632023-10-13xbrli:shares00010189632023-09-30iso4217:USD00010189632022-12-31iso4217:USDxbrli:shares00010189632023-07-012023-09-3000010189632022-07-012022-09-3000010189632022-01-012022-09-3000010189632021-12-3100010189632022-09-300001018963us-gaap:CommonStockMember2022-06-300001018963us-gaap:AdditionalPaidInCapitalMember2022-06-300001018963us-gaap:RetainedEarningsMember2022-06-300001018963us-gaap:TreasuryStockCommonMember2022-06-300001018963us-gaap:AccumulatedOtherComprehensiveIncomeMember2022-06-300001018963us-gaap:NoncontrollingInterestMember2022-06-3000010189632022-06-300001018963us-gaap:RetainedEarningsMember2022-07-012022-09-300001018963us-gaap:NoncontrollingInterestMember2022-07-012022-09-300001018963us-gaap:AccumulatedOtherComprehensiveIncomeMember2022-07-012022-09-300001018963us-gaap:TreasuryStockCommonMember2022-07-012022-09-300001018963us-gaap:CommonStockMember2022-07-012022-09-300001018963us-gaap:AdditionalPaidInCapitalMember2022-07-012022-09-300001018963us-gaap:CommonStockMember2022-09-300001018963us-gaap:AdditionalPaidInCapitalMember2022-09-300001018963us-gaap:RetainedEarningsMember2022-09-300001018963us-gaap:TreasuryStockCommonMember2022-09-300001018963us-gaap:AccumulatedOtherComprehensiveIncomeMember2022-09-300001018963us-gaap:NoncontrollingInterestMember2022-09-300001018963us-gaap:CommonStockMember2023-06-300001018963us-gaap:AdditionalPaidInCapitalMember2023-06-300001018963us-gaap:RetainedEarningsMember2023-06-300001018963us-gaap:TreasuryStockCommonMember2023-06-300001018963us-gaap:AccumulatedOtherComprehensiveIncomeMember2023-06-300001018963us-gaap:NoncontrollingInterestMember2023-06-3000010189632023-06-300001018963us-gaap:RetainedEarningsMember2023-07-012023-09-300001018963us-gaap:NoncontrollingInterestMember2023-07-012023-09-300001018963us-gaap:AccumulatedOtherComprehensiveIncomeMember2023-07-012023-09-300001018963us-gaap:TreasuryStockCommonMember2023-07-012023-09-300001018963us-gaap:CommonStockMember2023-07-012023-09-300001018963us-gaap:AdditionalPaidInCapitalMember2023-07-012023-09-300001018963us-gaap:CommonStockMember2023-09-300001018963us-gaap:AdditionalPaidInCapitalMember2023-09-300001018963us-gaap:RetainedEarningsMember2023-09-300001018963us-gaap:TreasuryStockCommonMember2023-09-300001018963us-gaap:AccumulatedOtherComprehensiveIncomeMember2023-09-300001018963us-gaap:NoncontrollingInterestMember2023-09-300001018963us-gaap:CommonStockMember2021-12-310001018963us-gaap:AdditionalPaidInCapitalMember2021-12-310001018963us-gaap:RetainedEarningsMember2021-12-310001018963us-gaap:TreasuryStockCommonMember2021-12-310001018963us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-12-310001018963us-gaap:NoncontrollingInterestMember2021-12-310001018963us-gaap:RetainedEarningsMember2022-01-012022-09-300001018963us-gaap:NoncontrollingInterestMember2022-01-012022-09-300001018963us-gaap:AccumulatedOtherComprehensiveIncomeMember2022-01-012022-09-300001018963us-gaap:TreasuryStockCommonMember2022-01-012022-09-300001018963us-gaap:CommonStockMember2022-01-012022-09-300001018963us-gaap:AdditionalPaidInCapitalMember2022-01-012022-09-300001018963us-gaap:CommonStockMember2022-12-310001018963us-gaap:AdditionalPaidInCapitalMember2022-12-310001018963us-gaap:RetainedEarningsMember2022-12-310001018963us-gaap:TreasuryStockCommonMember2022-12-310001018963us-gaap:AccumulatedOtherComprehensiveIncomeMember2022-12-310001018963us-gaap:NoncontrollingInterestMember2022-12-310001018963us-gaap:RetainedEarningsMember2023-01-012023-09-300001018963us-gaap:NoncontrollingInterestMember2023-01-012023-09-300001018963us-gaap:AccumulatedOtherComprehensiveIncomeMember2023-01-012023-09-300001018963us-gaap:TreasuryStockCommonMember2023-01-012023-09-300001018963us-gaap:CommonStockMember2023-01-012023-09-300001018963us-gaap:AdditionalPaidInCapitalMember2023-01-012023-09-30ati:segment0001018963ati:JetEnginesCommercialMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:AdvancedAlloysSolutionsMemberati:JetEnginesCommercialMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:JetEnginesCommercialMember2023-07-012023-09-300001018963ati:JetEnginesCommercialMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:AdvancedAlloysSolutionsMemberati:JetEnginesCommercialMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:JetEnginesCommercialMember2022-07-012022-09-300001018963ati:AirframesCommercialMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:AdvancedAlloysSolutionsMemberati:AirframesCommercialMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:AirframesCommercialMember2023-07-012023-09-300001018963ati:AirframesCommercialMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:AdvancedAlloysSolutionsMemberati:AirframesCommercialMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:AirframesCommercialMember2022-07-012022-09-300001018963ati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMemberati:DefenseMember2023-07-012023-09-300001018963ati:AdvancedAlloysSolutionsMemberus-gaap:OperatingSegmentsMemberati:DefenseMember2023-07-012023-09-300001018963ati:DefenseMember2023-07-012023-09-300001018963ati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMemberati:DefenseMember2022-07-012022-09-300001018963ati:AdvancedAlloysSolutionsMemberus-gaap:OperatingSegmentsMemberati:DefenseMember2022-07-012022-09-300001018963ati:DefenseMember2022-07-012022-09-300001018963ati:AerospaceandDefenseMarketMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:AdvancedAlloysSolutionsMemberati:AerospaceandDefenseMarketMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:AerospaceandDefenseMarketMember2023-07-012023-09-300001018963ati:AerospaceandDefenseMarketMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:AdvancedAlloysSolutionsMemberati:AerospaceandDefenseMarketMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:AerospaceandDefenseMarketMember2022-07-012022-09-300001018963ati:HighPerformanceMaterialsComponentsMemberati:OilGasMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:AdvancedAlloysSolutionsMemberati:OilGasMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:OilGasMember2023-07-012023-09-300001018963ati:HighPerformanceMaterialsComponentsMemberati:OilGasMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:AdvancedAlloysSolutionsMemberati:OilGasMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:OilGasMember2022-07-012022-09-300001018963ati:SpecialtyEnergyMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:AdvancedAlloysSolutionsMemberati:SpecialtyEnergyMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:SpecialtyEnergyMember2023-07-012023-09-300001018963ati:SpecialtyEnergyMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:AdvancedAlloysSolutionsMemberati:SpecialtyEnergyMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:SpecialtyEnergyMember2022-07-012022-09-300001018963ati:EnergyMarketMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:AdvancedAlloysSolutionsMemberati:EnergyMarketMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:EnergyMarketMember2023-07-012023-09-300001018963ati:EnergyMarketMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:AdvancedAlloysSolutionsMemberati:EnergyMarketMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:EnergyMarketMember2022-07-012022-09-300001018963ati:HighPerformanceMaterialsComponentsMemberati:AutomotiveMarketMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:AdvancedAlloysSolutionsMemberati:AutomotiveMarketMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:AutomotiveMarketMember2023-07-012023-09-300001018963ati:HighPerformanceMaterialsComponentsMemberati:AutomotiveMarketMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:AdvancedAlloysSolutionsMemberati:AutomotiveMarketMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:AutomotiveMarketMember2022-07-012022-09-300001018963ati:MedicalMarketMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:MedicalMarketMemberati:AdvancedAlloysSolutionsMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:MedicalMarketMember2023-07-012023-09-300001018963ati:MedicalMarketMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:MedicalMarketMemberati:AdvancedAlloysSolutionsMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:MedicalMarketMember2022-07-012022-09-300001018963ati:ElectronicsMarketMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:ElectronicsMarketMemberati:AdvancedAlloysSolutionsMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:ElectronicsMarketMember2023-07-012023-09-300001018963ati:ElectronicsMarketMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:ElectronicsMarketMemberati:AdvancedAlloysSolutionsMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:ElectronicsMarketMember2022-07-012022-09-300001018963ati:ConstructionMiningMarketMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:AdvancedAlloysSolutionsMemberati:ConstructionMiningMarketMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:ConstructionMiningMarketMember2023-07-012023-09-300001018963ati:ConstructionMiningMarketMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:AdvancedAlloysSolutionsMemberati:ConstructionMiningMarketMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:ConstructionMiningMarketMember2022-07-012022-09-300001018963ati:FoodEquipmentandAppliancesMarketMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:FoodEquipmentandAppliancesMarketMemberati:AdvancedAlloysSolutionsMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:FoodEquipmentandAppliancesMarketMember2023-07-012023-09-300001018963ati:FoodEquipmentandAppliancesMarketMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:FoodEquipmentandAppliancesMarketMemberati:AdvancedAlloysSolutionsMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:FoodEquipmentandAppliancesMarketMember2022-07-012022-09-300001018963ati:HighPerformanceMaterialsComponentsMemberati:OtherMarketMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:AdvancedAlloysSolutionsMemberati:OtherMarketMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:OtherMarketMember2023-07-012023-09-300001018963ati:HighPerformanceMaterialsComponentsMemberati:OtherMarketMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:AdvancedAlloysSolutionsMemberati:OtherMarketMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:OtherMarketMember2022-07-012022-09-300001018963ati:HighPerformanceMaterialsComponentsMemberati:ExternalCustomersMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:AdvancedAlloysSolutionsMemberati:ExternalCustomersMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:HighPerformanceMaterialsComponentsMemberati:ExternalCustomersMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:AdvancedAlloysSolutionsMemberati:ExternalCustomersMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:JetEnginesCommercialMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:AdvancedAlloysSolutionsMemberati:JetEnginesCommercialMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:JetEnginesCommercialMember2023-01-012023-09-300001018963ati:JetEnginesCommercialMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:AdvancedAlloysSolutionsMemberati:JetEnginesCommercialMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:JetEnginesCommercialMember2022-01-012022-09-300001018963ati:AirframesCommercialMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:AdvancedAlloysSolutionsMemberati:AirframesCommercialMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:AirframesCommercialMember2023-01-012023-09-300001018963ati:AirframesCommercialMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:AdvancedAlloysSolutionsMemberati:AirframesCommercialMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:AirframesCommercialMember2022-01-012022-09-300001018963ati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMemberati:DefenseMember2023-01-012023-09-300001018963ati:AdvancedAlloysSolutionsMemberus-gaap:OperatingSegmentsMemberati:DefenseMember2023-01-012023-09-300001018963ati:DefenseMember2023-01-012023-09-300001018963ati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMemberati:DefenseMember2022-01-012022-09-300001018963ati:AdvancedAlloysSolutionsMemberus-gaap:OperatingSegmentsMemberati:DefenseMember2022-01-012022-09-300001018963ati:DefenseMember2022-01-012022-09-300001018963ati:AerospaceandDefenseMarketMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:AdvancedAlloysSolutionsMemberati:AerospaceandDefenseMarketMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:AerospaceandDefenseMarketMember2023-01-012023-09-300001018963ati:AerospaceandDefenseMarketMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:AdvancedAlloysSolutionsMemberati:AerospaceandDefenseMarketMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:AerospaceandDefenseMarketMember2022-01-012022-09-300001018963ati:HighPerformanceMaterialsComponentsMemberati:OilGasMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:AdvancedAlloysSolutionsMemberati:OilGasMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:OilGasMember2023-01-012023-09-300001018963ati:HighPerformanceMaterialsComponentsMemberati:OilGasMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:AdvancedAlloysSolutionsMemberati:OilGasMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:OilGasMember2022-01-012022-09-300001018963ati:SpecialtyEnergyMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:AdvancedAlloysSolutionsMemberati:SpecialtyEnergyMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:SpecialtyEnergyMember2023-01-012023-09-300001018963ati:SpecialtyEnergyMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:AdvancedAlloysSolutionsMemberati:SpecialtyEnergyMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:SpecialtyEnergyMember2022-01-012022-09-300001018963ati:EnergyMarketMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:AdvancedAlloysSolutionsMemberati:EnergyMarketMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:EnergyMarketMember2023-01-012023-09-300001018963ati:EnergyMarketMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:AdvancedAlloysSolutionsMemberati:EnergyMarketMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:EnergyMarketMember2022-01-012022-09-300001018963ati:HighPerformanceMaterialsComponentsMemberati:AutomotiveMarketMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:AdvancedAlloysSolutionsMemberati:AutomotiveMarketMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:AutomotiveMarketMember2023-01-012023-09-300001018963ati:HighPerformanceMaterialsComponentsMemberati:AutomotiveMarketMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:AdvancedAlloysSolutionsMemberati:AutomotiveMarketMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:AutomotiveMarketMember2022-01-012022-09-300001018963ati:ConstructionMiningMarketMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:AdvancedAlloysSolutionsMemberati:ConstructionMiningMarketMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:ConstructionMiningMarketMember2023-01-012023-09-300001018963ati:ConstructionMiningMarketMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:AdvancedAlloysSolutionsMemberati:ConstructionMiningMarketMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:ConstructionMiningMarketMember2022-01-012022-09-300001018963ati:MedicalMarketMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:MedicalMarketMemberati:AdvancedAlloysSolutionsMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:MedicalMarketMember2023-01-012023-09-300001018963ati:MedicalMarketMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:MedicalMarketMemberati:AdvancedAlloysSolutionsMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:MedicalMarketMember2022-01-012022-09-300001018963ati:ElectronicsMarketMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:ElectronicsMarketMemberati:AdvancedAlloysSolutionsMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:ElectronicsMarketMember2023-01-012023-09-300001018963ati:ElectronicsMarketMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:ElectronicsMarketMemberati:AdvancedAlloysSolutionsMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:ElectronicsMarketMember2022-01-012022-09-300001018963ati:FoodEquipmentandAppliancesMarketMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:FoodEquipmentandAppliancesMarketMemberati:AdvancedAlloysSolutionsMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:FoodEquipmentandAppliancesMarketMember2023-01-012023-09-300001018963ati:FoodEquipmentandAppliancesMarketMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:FoodEquipmentandAppliancesMarketMemberati:AdvancedAlloysSolutionsMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:FoodEquipmentandAppliancesMarketMember2022-01-012022-09-300001018963ati:HighPerformanceMaterialsComponentsMemberati:OtherMarketMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:AdvancedAlloysSolutionsMemberati:OtherMarketMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:OtherMarketMember2023-01-012023-09-300001018963ati:HighPerformanceMaterialsComponentsMemberati:OtherMarketMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:AdvancedAlloysSolutionsMemberati:OtherMarketMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:OtherMarketMember2022-01-012022-09-300001018963ati:HighPerformanceMaterialsComponentsMemberati:ExternalCustomersMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:AdvancedAlloysSolutionsMemberati:ExternalCustomersMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:HighPerformanceMaterialsComponentsMemberati:ExternalCustomersMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:AdvancedAlloysSolutionsMemberati:ExternalCustomersMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963country:USati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963country:USati:AdvancedAlloysSolutionsMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963country:US2023-07-012023-09-300001018963country:USati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963country:USati:AdvancedAlloysSolutionsMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963country:US2022-07-012022-09-300001018963srt:EuropeMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:AdvancedAlloysSolutionsMembersrt:EuropeMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963srt:EuropeMember2023-07-012023-09-300001018963srt:EuropeMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:AdvancedAlloysSolutionsMembersrt:EuropeMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963srt:EuropeMember2022-07-012022-09-300001018963srt:AsiaMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:AdvancedAlloysSolutionsMembersrt:AsiaMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963srt:AsiaMember2023-07-012023-09-300001018963srt:AsiaMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:AdvancedAlloysSolutionsMembersrt:AsiaMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963srt:AsiaMember2022-07-012022-09-300001018963country:CAati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:AdvancedAlloysSolutionsMembercountry:CAus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963country:CA2023-07-012023-09-300001018963country:CAati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:AdvancedAlloysSolutionsMembercountry:CAus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963country:CA2022-07-012022-09-300001018963ati:HighPerformanceMaterialsComponentsMemberati:SouthAmericaMiddleEastandOtherMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:AdvancedAlloysSolutionsMemberati:SouthAmericaMiddleEastandOtherMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:SouthAmericaMiddleEastandOtherMember2023-07-012023-09-300001018963ati:HighPerformanceMaterialsComponentsMemberati:SouthAmericaMiddleEastandOtherMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:AdvancedAlloysSolutionsMemberati:SouthAmericaMiddleEastandOtherMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:SouthAmericaMiddleEastandOtherMember2022-07-012022-09-300001018963country:USati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963country:USati:AdvancedAlloysSolutionsMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963country:US2023-01-012023-09-300001018963country:USati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963country:USati:AdvancedAlloysSolutionsMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963country:US2022-01-012022-09-300001018963srt:EuropeMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:AdvancedAlloysSolutionsMembersrt:EuropeMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963srt:EuropeMember2023-01-012023-09-300001018963srt:EuropeMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:AdvancedAlloysSolutionsMembersrt:EuropeMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963srt:EuropeMember2022-01-012022-09-300001018963srt:AsiaMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:AdvancedAlloysSolutionsMembersrt:AsiaMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963srt:AsiaMember2023-01-012023-09-300001018963srt:AsiaMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:AdvancedAlloysSolutionsMembersrt:AsiaMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963srt:AsiaMember2022-01-012022-09-300001018963country:CAati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:AdvancedAlloysSolutionsMembercountry:CAus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963country:CA2023-01-012023-09-300001018963country:CAati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:AdvancedAlloysSolutionsMembercountry:CAus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963country:CA2022-01-012022-09-300001018963ati:HighPerformanceMaterialsComponentsMemberati:SouthAmericaMiddleEastandOtherMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:AdvancedAlloysSolutionsMemberati:SouthAmericaMiddleEastandOtherMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:SouthAmericaMiddleEastandOtherMember2023-01-012023-09-300001018963ati:HighPerformanceMaterialsComponentsMemberati:SouthAmericaMiddleEastandOtherMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:AdvancedAlloysSolutionsMemberati:SouthAmericaMiddleEastandOtherMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:SouthAmericaMiddleEastandOtherMember2022-01-012022-09-300001018963ati:NickelbasedAlloysandSpecialtyAlloysMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-30xbrli:pure0001018963ati:AdvancedAlloysSolutionsMemberati:NickelbasedAlloysandSpecialtyAlloysMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:NickelbasedAlloysandSpecialtyAlloysMember2023-07-012023-09-300001018963ati:NickelbasedAlloysandSpecialtyAlloysMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:AdvancedAlloysSolutionsMemberati:NickelbasedAlloysandSpecialtyAlloysMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:NickelbasedAlloysandSpecialtyAlloysMember2022-07-012022-09-300001018963ati:TitaniumandTitaniumbasedAlloysMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:TitaniumandTitaniumbasedAlloysMemberati:AdvancedAlloysSolutionsMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:TitaniumandTitaniumbasedAlloysMember2023-07-012023-09-300001018963ati:TitaniumandTitaniumbasedAlloysMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:TitaniumandTitaniumbasedAlloysMemberati:AdvancedAlloysSolutionsMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:TitaniumandTitaniumbasedAlloysMember2022-07-012022-09-300001018963ati:HighPerformanceMaterialsComponentsMemberati:PrecisionForgingsCastingandComponentsMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:AdvancedAlloysSolutionsMemberati:PrecisionForgingsCastingandComponentsMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:PrecisionForgingsCastingandComponentsMember2023-07-012023-09-300001018963ati:HighPerformanceMaterialsComponentsMemberati:PrecisionForgingsCastingandComponentsMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:AdvancedAlloysSolutionsMemberati:PrecisionForgingsCastingandComponentsMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:PrecisionForgingsCastingandComponentsMember2022-07-012022-09-300001018963ati:PrecisionRolledStripProductsMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:PrecisionRolledStripProductsMemberati:AdvancedAlloysSolutionsMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:PrecisionRolledStripProductsMember2023-07-012023-09-300001018963ati:PrecisionRolledStripProductsMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:PrecisionRolledStripProductsMemberati:AdvancedAlloysSolutionsMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:PrecisionRolledStripProductsMember2022-07-012022-09-300001018963ati:ZirconiumandRelatedAlloysMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:AdvancedAlloysSolutionsMemberati:ZirconiumandRelatedAlloysMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:ZirconiumandRelatedAlloysMember2023-07-012023-09-300001018963ati:ZirconiumandRelatedAlloysMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:AdvancedAlloysSolutionsMemberati:ZirconiumandRelatedAlloysMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:ZirconiumandRelatedAlloysMember2022-07-012022-09-300001018963ati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:AdvancedAlloysSolutionsMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:AdvancedAlloysSolutionsMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:NickelbasedAlloysandSpecialtyAlloysMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:AdvancedAlloysSolutionsMemberati:NickelbasedAlloysandSpecialtyAlloysMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:NickelbasedAlloysandSpecialtyAlloysMember2023-01-012023-09-300001018963ati:NickelbasedAlloysandSpecialtyAlloysMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:AdvancedAlloysSolutionsMemberati:NickelbasedAlloysandSpecialtyAlloysMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:NickelbasedAlloysandSpecialtyAlloysMember2022-01-012022-09-300001018963ati:HighPerformanceMaterialsComponentsMemberati:PrecisionForgingsCastingandComponentsMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:AdvancedAlloysSolutionsMemberati:PrecisionForgingsCastingandComponentsMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:PrecisionForgingsCastingandComponentsMember2023-01-012023-09-300001018963ati:HighPerformanceMaterialsComponentsMemberati:PrecisionForgingsCastingandComponentsMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:AdvancedAlloysSolutionsMemberati:PrecisionForgingsCastingandComponentsMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:PrecisionForgingsCastingandComponentsMember2022-01-012022-09-300001018963ati:TitaniumandTitaniumbasedAlloysMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:TitaniumandTitaniumbasedAlloysMemberati:AdvancedAlloysSolutionsMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:TitaniumandTitaniumbasedAlloysMember2023-01-012023-09-300001018963ati:TitaniumandTitaniumbasedAlloysMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:TitaniumandTitaniumbasedAlloysMemberati:AdvancedAlloysSolutionsMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:TitaniumandTitaniumbasedAlloysMember2022-01-012022-09-300001018963ati:PrecisionRolledStripProductsMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:PrecisionRolledStripProductsMemberati:AdvancedAlloysSolutionsMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:PrecisionRolledStripProductsMember2023-01-012023-09-300001018963ati:PrecisionRolledStripProductsMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:PrecisionRolledStripProductsMemberati:AdvancedAlloysSolutionsMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:PrecisionRolledStripProductsMember2022-01-012022-09-300001018963ati:ZirconiumandRelatedAlloysMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:AdvancedAlloysSolutionsMemberati:ZirconiumandRelatedAlloysMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:ZirconiumandRelatedAlloysMember2023-01-012023-09-300001018963ati:ZirconiumandRelatedAlloysMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:AdvancedAlloysSolutionsMemberati:ZirconiumandRelatedAlloysMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:ZirconiumandRelatedAlloysMember2022-01-012022-09-300001018963ati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:AdvancedAlloysSolutionsMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:AdvancedAlloysSolutionsMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:ShanghaiStalPrecisionStainlessSteelCoLtdMemberati:AdvancedAlloysSolutionsMemberati:ATIIncMember2023-09-300001018963ati:ChinaBaowuSteelGroupCorporationLimitedMemberati:ShanghaiStalPrecisionStainlessSteelCoLtdMemberati:AdvancedAlloysSolutionsMemberati:ChinaBaowuSteelGroupCorporationLimitedMember2023-09-300001018963ati:ShanghaiStalPrecisionStainlessSteelCoLtdMemberati:AdvancedAlloysSolutionsMember2023-09-300001018963ati:NextGenAlloysLLCMemberati:ATIIncMember2023-09-300001018963ati:NextGenAlloysLLCMember2022-01-012022-09-300001018963ati:NextGenAlloysLLCMember2023-09-300001018963ati:AlleghenyTsingshanStainlessMember2023-09-300001018963ati:TsingshanGroupMemberati:AlleghenyTsingshanStainlessMemberati:TsingshanGroupMember2023-09-300001018963ati:AlleghenyTsingshanStainlessMemberati:TsingshanGroupMember2018-03-012022-12-310001018963ati:AlleghenyTsingshanStainlessMemberati:TsingshanGroupMember2018-03-012018-12-310001018963ati:AlleghenyTsingshanStainlessMemberati:TsingshanGroupMember2022-10-012022-12-310001018963ati:AlleghenyTsingshanStainlessMemberati:AdvancedAlloysSolutionsMember2023-07-012023-09-300001018963ati:AlleghenyTsingshanStainlessMemberati:AdvancedAlloysSolutionsMember2023-01-012023-09-300001018963ati:AlleghenyTsingshanStainlessMemberati:AdvancedAlloysSolutionsMember2022-07-012022-09-300001018963ati:AlleghenyTsingshanStainlessMemberati:AdvancedAlloysSolutionsMember2022-01-012022-09-300001018963ati:AlleghenyTsingshanStainlessMemberati:ATStainlessMember2022-01-012022-09-300001018963ati:AlleghenyTsingshanStainlessMember2022-09-300001018963us-gaap:RelatedPartyMemberati:AlleghenyTsingshanStainlessMemberati:AdvancedAlloysSolutionsMember2023-09-300001018963us-gaap:RelatedPartyMemberati:AlleghenyTsingshanStainlessMemberati:AdvancedAlloysSolutionsMember2022-12-310001018963us-gaap:RelatedPartyMemberati:AlleghenyTsingshanStainlessMemberati:AdvancedAlloysSolutionsMemberus-gaap:PrepaidExpensesAndOtherCurrentAssetsMember2023-09-300001018963us-gaap:RelatedPartyMemberati:AlleghenyTsingshanStainlessMemberati:AdvancedAlloysSolutionsMemberus-gaap:OtherNoncurrentAssetsMember2023-09-300001018963us-gaap:RelatedPartyMemberati:AlleghenyTsingshanStainlessMemberati:AdvancedAlloysSolutionsMemberus-gaap:PrepaidExpensesAndOtherCurrentAssetsMember2022-12-310001018963us-gaap:RelatedPartyMemberati:AlleghenyTsingshanStainlessMemberati:AdvancedAlloysSolutionsMemberus-gaap:OtherNoncurrentAssetsMember2022-12-310001018963ati:UnitiMember2023-09-300001018963ati:VSMPOMemberati:VSMPOMemberati:UnitiMember2023-09-300001018963ati:AdvancedAlloysSolutionsMemberati:UnitiMember2023-07-012023-09-300001018963ati:AdvancedAlloysSolutionsMemberati:UnitiMember2023-01-012023-09-300001018963ati:AdvancedAlloysSolutionsMemberati:UnitiMember2022-07-012022-09-300001018963ati:AdvancedAlloysSolutionsMemberati:UnitiMember2022-01-012022-09-300001018963us-gaap:OtherCurrentLiabilitiesMember2023-09-300001018963us-gaap:OtherNoncurrentLiabilitiesMember2023-09-300001018963ati:ATI2030NotesMember2023-01-012023-09-300001018963ati:ATI2030NotesMember2023-09-300001018963ati:ATI2030NotesMember2022-12-310001018963ati:ATI2027NotesMember2023-01-012023-09-300001018963ati:ATI2027NotesMember2022-01-012022-12-310001018963ati:ATI2027NotesMember2022-12-310001018963ati:ATI2027NotesMember2023-09-300001018963ati:ATI2031NotesMember2023-01-012023-09-300001018963ati:ATI2031NotesMember2022-01-012022-12-310001018963ati:ATI2031NotesMember2022-12-310001018963ati:ATI2031NotesMember2023-09-300001018963ati:ATI2029NotesMember2023-01-012023-09-300001018963ati:ATI2029NotesMember2022-01-012022-12-310001018963ati:ATI2029NotesMember2022-12-310001018963ati:ATI2029NotesMember2023-09-300001018963us-gaap:ConvertibleDebtMemberati:ATIIncConvertibleSeniorNotes35Due2025Member2022-01-012022-12-310001018963us-gaap:ConvertibleDebtMemberati:ATIIncConvertibleSeniorNotes35Due2025Member2023-01-012023-09-300001018963us-gaap:ConvertibleDebtMemberati:ATIIncConvertibleSeniorNotes35Due2025Member2023-09-300001018963us-gaap:ConvertibleDebtMemberati:ATIIncConvertibleSeniorNotes35Due2025Member2022-12-310001018963ati:AlleghenyLudlumDebenturesDue2025Member2023-01-012023-09-300001018963ati:AlleghenyLudlumDebenturesDue2025Member2022-01-012022-12-310001018963ati:AlleghenyLudlumDebenturesDue2025Member2023-09-300001018963ati:AlleghenyLudlumDebenturesDue2025Member2022-12-310001018963ati:A2027TermLoanMember2023-09-300001018963ati:A2027TermLoanMember2022-12-310001018963ati:DomesticBankGroup600MillionAssetBasedCreditFacilityMember2023-09-300001018963ati:DomesticBankGroup600MillionAssetBasedCreditFacilityMember2022-12-310001018963us-gaap:ForeignLineOfCreditMember2023-09-300001018963us-gaap:ForeignLineOfCreditMember2022-12-310001018963us-gaap:NotesPayableOtherPayablesMember2023-09-300001018963us-gaap:NotesPayableOtherPayablesMember2022-12-310001018963us-gaap:RevolvingCreditFacilityMemberati:DomesticBankGroup600MillionAssetBasedCreditFacilityMember2023-09-300001018963us-gaap:LetterOfCreditMemberati:DomesticBankGroup600MillionAssetBasedCreditFacilityMember2023-09-300001018963ati:SecuredOvernightFinancingRateSOFRMemberati:A2027TermLoanMember2023-01-012023-09-300001018963ati:A2027TermLoanMember2023-01-012023-09-300001018963us-gaap:RevolvingCreditFacilityMembersrt:ScenarioForecastMemberati:DomesticBankGroup600MillionAssetBasedCreditFacilityMember2027-09-090001018963us-gaap:InterestRateSwapMemberati:A2027TermLoanMember2023-09-300001018963srt:MinimumMemberati:SecuredOvernightFinancingRateSOFRMemberus-gaap:RevolvingCreditFacilityMemberati:DomesticBankGroup600MillionAssetBasedCreditFacilityMember2023-01-012023-09-300001018963ati:SecuredOvernightFinancingRateSOFRMembersrt:MaximumMemberus-gaap:RevolvingCreditFacilityMemberati:DomesticBankGroup600MillionAssetBasedCreditFacilityMember2023-01-012023-09-300001018963srt:MinimumMemberus-gaap:RevolvingCreditFacilityMemberati:DomesticBankGroup600MillionAssetBasedCreditFacilityMemberus-gaap:BaseRateMember2023-01-012023-09-300001018963srt:MaximumMemberus-gaap:RevolvingCreditFacilityMemberati:DomesticBankGroup600MillionAssetBasedCreditFacilityMemberus-gaap:BaseRateMember2023-01-012023-09-300001018963us-gaap:RevolvingCreditFacilityMemberati:DomesticBankGroup600MillionAssetBasedCreditFacilityMember2023-01-012023-09-300001018963ati:DomesticBankGroup600MillionAssetBasedCreditFacilityMember2023-01-012023-09-300001018963ati:DomesticBankGroup600MillionAssetBasedCreditFacilityMember2022-01-012022-09-300001018963ati:ATI2030NotesMember2023-08-112023-08-110001018963us-gaap:PensionPlansDefinedBenefitMember2023-07-012023-09-300001018963ati:ATI2030NotesMember2023-08-110001018963srt:MinimumMemberati:ATI2030NotesMember2023-01-012023-09-300001018963ati:ATI2030NotesMembersrt:MaximumMember2023-01-012023-09-300001018963us-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:ConvertibleDebtMemberati:ATIIncConvertibleSeniorNotes35Due2025Memberus-gaap:FairValueInputsLevel1Member2023-09-300001018963us-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:ConvertibleDebtMemberati:ATIIncConvertibleSeniorNotes35Due2025Memberus-gaap:FairValueInputsLevel1Member2022-12-310001018963us-gaap:ConvertibleDebtMemberati:ATIIncConvertibleSeniorNotes35Due2025Member2022-09-300001018963us-gaap:ConvertibleDebtMemberati:ATIIncConvertibleSeniorNotes35Due2025Member2023-07-012023-09-300001018963us-gaap:ConvertibleDebtMemberati:ATIIncConvertibleSeniorNotes35Due2025Member2022-07-012022-09-300001018963us-gaap:ConvertibleDebtMemberati:ATIIncConvertibleSeniorNotes35Due2025Member2022-01-012022-09-30ati:tradingDays0001018963ati:A2027TermLoanMember2022-01-012022-12-310001018963ati:NickelMember2023-01-012023-09-30utr:lb0001018963us-gaap:CashFlowHedgingMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:ForeignExchangeForwardMember2023-09-30iso4217:EUR0001018963us-gaap:PrepaidExpensesAndOtherCurrentAssetsMemberus-gaap:InterestRateSwapMemberus-gaap:DesignatedAsHedgingInstrumentMember2023-09-300001018963us-gaap:PrepaidExpensesAndOtherCurrentAssetsMemberus-gaap:InterestRateSwapMemberus-gaap:DesignatedAsHedgingInstrumentMember2022-12-310001018963us-gaap:PrepaidExpensesAndOtherCurrentAssetsMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:ForeignExchangeContractMember2023-09-300001018963us-gaap:PrepaidExpensesAndOtherCurrentAssetsMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:ForeignExchangeContractMember2022-12-310001018963us-gaap:PrepaidExpensesAndOtherCurrentAssetsMemberus-gaap:DesignatedAsHedgingInstrumentMemberati:NickelAndOtherRawMaterialContractsMember2023-09-300001018963us-gaap:PrepaidExpensesAndOtherCurrentAssetsMemberus-gaap:DesignatedAsHedgingInstrumentMemberati:NickelAndOtherRawMaterialContractsMember2022-12-310001018963us-gaap:PrepaidExpensesAndOtherCurrentAssetsMemberati:NaturalGasContractsMemberus-gaap:DesignatedAsHedgingInstrumentMember2023-09-300001018963us-gaap:PrepaidExpensesAndOtherCurrentAssetsMemberati:NaturalGasContractsMemberus-gaap:DesignatedAsHedgingInstrumentMember2022-12-310001018963us-gaap:OtherAssetsMemberus-gaap:InterestRateSwapMemberus-gaap:DesignatedAsHedgingInstrumentMember2023-09-300001018963us-gaap:OtherAssetsMemberus-gaap:InterestRateSwapMemberus-gaap:DesignatedAsHedgingInstrumentMember2022-12-310001018963us-gaap:OtherAssetsMemberus-gaap:DesignatedAsHedgingInstrumentMemberati:NickelAndOtherRawMaterialContractsMember2023-09-300001018963us-gaap:OtherAssetsMemberus-gaap:DesignatedAsHedgingInstrumentMemberati:NickelAndOtherRawMaterialContractsMember2022-12-310001018963us-gaap:OtherAssetsMemberati:NaturalGasContractsMemberus-gaap:DesignatedAsHedgingInstrumentMember2023-09-300001018963us-gaap:OtherAssetsMemberati:NaturalGasContractsMemberus-gaap:DesignatedAsHedgingInstrumentMember2022-12-310001018963us-gaap:DesignatedAsHedgingInstrumentMember2023-09-300001018963us-gaap:DesignatedAsHedgingInstrumentMember2022-12-310001018963us-gaap:AccruedLiabilitiesMemberati:NaturalGasContractsMemberus-gaap:DesignatedAsHedgingInstrumentMember2023-09-300001018963us-gaap:AccruedLiabilitiesMemberati:NaturalGasContractsMemberus-gaap:DesignatedAsHedgingInstrumentMember2022-12-310001018963us-gaap:AccruedLiabilitiesMemberus-gaap:DesignatedAsHedgingInstrumentMemberati:NickelAndOtherRawMaterialContractsMember2023-09-300001018963us-gaap:AccruedLiabilitiesMemberus-gaap:DesignatedAsHedgingInstrumentMemberati:NickelAndOtherRawMaterialContractsMember2022-12-310001018963us-gaap:OtherLiabilitiesMemberati:NaturalGasContractsMemberus-gaap:DesignatedAsHedgingInstrumentMember2023-09-300001018963us-gaap:OtherLiabilitiesMemberati:NaturalGasContractsMemberus-gaap:DesignatedAsHedgingInstrumentMember2022-12-310001018963us-gaap:OtherLiabilitiesMemberus-gaap:DesignatedAsHedgingInstrumentMemberati:NickelAndOtherRawMaterialContractsMember2023-09-300001018963us-gaap:OtherLiabilitiesMemberus-gaap:DesignatedAsHedgingInstrumentMemberati:NickelAndOtherRawMaterialContractsMember2022-12-310001018963us-gaap:CashFlowHedgingMemberus-gaap:OtherComprehensiveIncomeMemberati:NickelAndOtherRawMaterialContractsMember2023-07-012023-09-300001018963us-gaap:CashFlowHedgingMemberus-gaap:OtherComprehensiveIncomeMemberati:NickelAndOtherRawMaterialContractsMember2022-07-012022-09-300001018963us-gaap:CashFlowHedgingMemberati:NickelAndOtherRawMaterialContractsMember2023-07-012023-09-300001018963us-gaap:CashFlowHedgingMemberati:NickelAndOtherRawMaterialContractsMember2022-07-012022-09-300001018963us-gaap:CashFlowHedgingMemberus-gaap:OtherComprehensiveIncomeMemberati:NaturalGasContractsMember2023-07-012023-09-300001018963us-gaap:CashFlowHedgingMemberus-gaap:OtherComprehensiveIncomeMemberati:NaturalGasContractsMember2022-07-012022-09-300001018963us-gaap:CashFlowHedgingMemberati:NaturalGasContractsMember2023-07-012023-09-300001018963us-gaap:CashFlowHedgingMemberati:NaturalGasContractsMember2022-07-012022-09-300001018963us-gaap:CashFlowHedgingMemberus-gaap:OtherComprehensiveIncomeMemberus-gaap:ForeignExchangeContractMember2023-07-012023-09-300001018963us-gaap:CashFlowHedgingMemberus-gaap:OtherComprehensiveIncomeMemberus-gaap:ForeignExchangeContractMember2022-07-012022-09-300001018963us-gaap:CashFlowHedgingMemberus-gaap:ForeignExchangeContractMember2023-07-012023-09-300001018963us-gaap:CashFlowHedgingMemberus-gaap:ForeignExchangeContractMember2022-07-012022-09-300001018963us-gaap:CashFlowHedgingMemberus-gaap:OtherComprehensiveIncomeMemberus-gaap:InterestRateSwapMember2023-07-012023-09-300001018963us-gaap:CashFlowHedgingMemberus-gaap:OtherComprehensiveIncomeMemberus-gaap:InterestRateSwapMember2022-07-012022-09-300001018963us-gaap:CashFlowHedgingMemberus-gaap:InterestRateSwapMember2023-07-012023-09-300001018963us-gaap:CashFlowHedgingMemberus-gaap:InterestRateSwapMember2022-07-012022-09-300001018963us-gaap:CashFlowHedgingMemberus-gaap:OtherComprehensiveIncomeMember2023-07-012023-09-300001018963us-gaap:CashFlowHedgingMemberus-gaap:OtherComprehensiveIncomeMember2022-07-012022-09-300001018963us-gaap:CashFlowHedgingMember2023-07-012023-09-300001018963us-gaap:CashFlowHedgingMember2022-07-012022-09-300001018963us-gaap:CashFlowHedgingMemberus-gaap:OtherComprehensiveIncomeMemberati:NickelAndOtherRawMaterialContractsMember2023-01-012023-09-300001018963us-gaap:CashFlowHedgingMemberus-gaap:OtherComprehensiveIncomeMemberati:NickelAndOtherRawMaterialContractsMember2022-01-012022-09-300001018963us-gaap:CashFlowHedgingMemberati:NickelAndOtherRawMaterialContractsMember2023-01-012023-09-300001018963us-gaap:CashFlowHedgingMemberati:NickelAndOtherRawMaterialContractsMember2022-01-012022-09-300001018963us-gaap:CashFlowHedgingMemberus-gaap:OtherComprehensiveIncomeMemberati:NaturalGasContractsMember2023-01-012023-09-300001018963us-gaap:CashFlowHedgingMemberus-gaap:OtherComprehensiveIncomeMemberati:NaturalGasContractsMember2022-01-012022-09-300001018963us-gaap:CashFlowHedgingMemberati:NaturalGasContractsMember2023-01-012023-09-300001018963us-gaap:CashFlowHedgingMemberati:NaturalGasContractsMember2022-01-012022-09-300001018963us-gaap:CashFlowHedgingMemberus-gaap:OtherComprehensiveIncomeMemberus-gaap:ForeignExchangeContractMember2023-01-012023-09-300001018963us-gaap:CashFlowHedgingMemberus-gaap:OtherComprehensiveIncomeMemberus-gaap:ForeignExchangeContractMember2022-01-012022-09-300001018963us-gaap:CashFlowHedgingMemberus-gaap:ForeignExchangeContractMember2023-01-012023-09-300001018963us-gaap:CashFlowHedgingMemberus-gaap:ForeignExchangeContractMember2022-01-012022-09-300001018963us-gaap:CashFlowHedgingMemberus-gaap:OtherComprehensiveIncomeMemberus-gaap:InterestRateSwapMember2023-01-012023-09-300001018963us-gaap:CashFlowHedgingMemberus-gaap:OtherComprehensiveIncomeMemberus-gaap:InterestRateSwapMember2022-01-012022-09-300001018963us-gaap:CashFlowHedgingMemberus-gaap:InterestRateSwapMember2023-01-012023-09-300001018963us-gaap:CashFlowHedgingMemberus-gaap:InterestRateSwapMember2022-01-012022-09-300001018963us-gaap:CashFlowHedgingMemberus-gaap:OtherComprehensiveIncomeMember2023-01-012023-09-300001018963us-gaap:CashFlowHedgingMemberus-gaap:OtherComprehensiveIncomeMember2022-01-012022-09-300001018963us-gaap:CashFlowHedgingMember2023-01-012023-09-300001018963us-gaap:CashFlowHedgingMember2022-01-012022-09-300001018963us-gaap:CarryingReportedAmountFairValueDisclosureMember2023-09-300001018963us-gaap:EstimateOfFairValueFairValueDisclosureMember2023-09-300001018963us-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel1Member2023-09-300001018963us-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel2Member2023-09-300001018963us-gaap:CarryingReportedAmountFairValueDisclosureMember2022-12-310001018963us-gaap:EstimateOfFairValueFairValueDisclosureMember2022-12-310001018963us-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel1Member2022-12-310001018963us-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel2Member2022-12-310001018963us-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963us-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963us-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963us-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:InternalCustomersMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:InternalCustomersMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:InternalCustomersMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:InternalCustomersMemberati:HighPerformanceMaterialsComponentsMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:AdvancedAlloysSolutionsMemberati:InternalCustomersMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:AdvancedAlloysSolutionsMemberati:InternalCustomersMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:AdvancedAlloysSolutionsMemberati:InternalCustomersMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:AdvancedAlloysSolutionsMemberati:InternalCustomersMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:InternalCustomersMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:InternalCustomersMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:InternalCustomersMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:InternalCustomersMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:ExternalCustomersMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-300001018963ati:ExternalCustomersMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-300001018963ati:ExternalCustomersMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-300001018963ati:ExternalCustomersMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-300001018963ati:NorthbrookILOperationsMember2023-07-012023-09-300001018963ati:NorthbrookILOperationsMember2023-01-012023-09-300001018963us-gaap:OperatingSegmentsMemberus-gaap:CorporateMember2023-07-012023-09-300001018963us-gaap:OperatingSegmentsMemberus-gaap:CorporateMember2022-07-012022-09-300001018963us-gaap:OperatingSegmentsMemberus-gaap:CorporateMember2023-01-012023-09-300001018963us-gaap:OperatingSegmentsMemberus-gaap:CorporateMember2022-01-012022-09-300001018963ati:HighPerformanceMaterialsComponentsMember2022-01-012022-09-300001018963ati:AdvancedAlloysSolutionsMember2022-01-012022-09-300001018963ati:StartUpCostsMember2023-07-012023-09-300001018963ati:UnplannedOutageCostsMember2023-07-012023-09-300001018963ati:StartUpCostsMember2023-01-012023-09-300001018963ati:UnplannedOutageCostsMember2023-01-012023-09-300001018963ati:AssetWriteOffsMember2023-01-012023-09-300001018963us-gaap:FacilityClosingMember2023-01-012023-09-300001018963ati:SheffieldUKOperationsMember2022-01-012022-09-300001018963ati:PicoRiveraCAOperationsMember2022-01-012022-09-300001018963us-gaap:PensionPlansDefinedBenefitMember2022-07-012022-09-300001018963us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2023-07-012023-09-300001018963us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-07-012022-09-300001018963us-gaap:PensionPlansDefinedBenefitMember2023-01-012023-09-300001018963us-gaap:PensionPlansDefinedBenefitMember2022-01-012022-09-300001018963us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2023-01-012023-09-300001018963us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-01-012022-09-300001018963ati:SheffieldUKOperationsMember2022-04-012022-06-300001018963ati:ATIIncConvertibleSeniorNotes35Due2025Member2023-07-012023-09-300001018963ati:ATIIncConvertibleSeniorNotes35Due2025Member2022-07-012022-09-300001018963ati:ATIIncConvertibleSeniorNotes35Due2025Member2023-01-012023-09-300001018963ati:ATIIncConvertibleSeniorNotes35Due2025Member2022-01-012022-09-3000010189632022-02-0200010189632023-04-280001018963us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2023-06-300001018963us-gaap:AccumulatedTranslationAdjustmentMember2023-06-300001018963us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2023-06-300001018963ati:AccumulatedDeferredTaxAssetValuationAllowanceMember2023-06-300001018963us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2023-07-012023-09-300001018963us-gaap:AccumulatedTranslationAdjustmentMember2023-07-012023-09-300001018963us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2023-07-012023-09-300001018963ati:AccumulatedDeferredTaxAssetValuationAllowanceMember2023-07-012023-09-300001018963us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2023-09-300001018963us-gaap:AccumulatedTranslationAdjustmentMember2023-09-300001018963us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2023-09-300001018963ati:AccumulatedDeferredTaxAssetValuationAllowanceMember2023-09-300001018963us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2022-12-310001018963us-gaap:AccumulatedTranslationAdjustmentMember2022-12-310001018963us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2022-12-310001018963ati:AccumulatedDeferredTaxAssetValuationAllowanceMember2022-12-310001018963us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2023-01-012023-09-300001018963us-gaap:AccumulatedTranslationAdjustmentMember2023-01-012023-09-300001018963us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2023-01-012023-09-300001018963ati:AccumulatedDeferredTaxAssetValuationAllowanceMember2023-01-012023-09-300001018963us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2022-06-300001018963us-gaap:AccumulatedTranslationAdjustmentMember2022-06-300001018963us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2022-06-300001018963ati:AccumulatedDeferredTaxAssetValuationAllowanceMember2022-06-300001018963us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2022-07-012022-09-300001018963us-gaap:AccumulatedTranslationAdjustmentMember2022-07-012022-09-300001018963us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2022-07-012022-09-300001018963ati:AccumulatedDeferredTaxAssetValuationAllowanceMember2022-07-012022-09-300001018963us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2022-09-300001018963us-gaap:AccumulatedTranslationAdjustmentMember2022-09-300001018963us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2022-09-300001018963ati:AccumulatedDeferredTaxAssetValuationAllowanceMember2022-09-300001018963us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2021-12-310001018963us-gaap:AccumulatedTranslationAdjustmentMember2021-12-310001018963us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2021-12-310001018963ati:AccumulatedDeferredTaxAssetValuationAllowanceMember2021-12-310001018963us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2022-01-012022-09-300001018963us-gaap:AccumulatedTranslationAdjustmentMember2022-01-012022-09-300001018963us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2022-01-012022-09-300001018963ati:AccumulatedDeferredTaxAssetValuationAllowanceMember2022-01-012022-09-300001018963us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2023-07-012023-09-300001018963us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2022-07-012022-09-300001018963us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2023-01-012023-09-300001018963us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2022-01-012022-09-300001018963us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedTranslationAdjustmentMember2023-07-012023-09-300001018963us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedTranslationAdjustmentMember2022-07-012022-09-300001018963us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedTranslationAdjustmentMember2023-01-012023-09-300001018963us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedTranslationAdjustmentMember2022-01-012022-09-300001018963us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMemberati:NickelAndOtherRawMaterialContractsMember2023-07-012023-09-300001018963us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMemberati:NickelAndOtherRawMaterialContractsMember2022-07-012022-09-300001018963us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMemberati:NickelAndOtherRawMaterialContractsMember2023-01-012023-09-300001018963us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMemberati:NickelAndOtherRawMaterialContractsMember2022-01-012022-09-300001018963srt:NaturalGasReservesMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2023-07-012023-09-300001018963srt:NaturalGasReservesMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2022-07-012022-09-300001018963srt:NaturalGasReservesMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2023-01-012023-09-300001018963srt:NaturalGasReservesMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2022-01-012022-09-300001018963us-gaap:ForeignExchangeMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2023-07-012023-09-300001018963us-gaap:ForeignExchangeMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2022-07-012022-09-300001018963us-gaap:ForeignExchangeMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2023-01-012023-09-300001018963us-gaap:ForeignExchangeMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2022-01-012022-09-300001018963us-gaap:InterestRateSwapMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2023-07-012023-09-300001018963us-gaap:InterestRateSwapMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2022-07-012022-09-300001018963us-gaap:InterestRateSwapMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2023-01-012023-09-300001018963us-gaap:InterestRateSwapMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2022-01-012022-09-300001018963us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2023-07-012023-09-300001018963us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2022-07-012022-09-300001018963us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2023-01-012023-09-300001018963us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2022-01-012022-09-300001018963srt:MaximumMember2023-09-300001018963us-gaap:SubsequentEventMember2023-10-18ati:uSRetireeAndBeneficiary0001018963ati:ElliotSDavisMember2023-01-012023-09-300001018963ati:ElliotSDavisMember2023-07-012023-09-300001018963ati:ElliotSDavisMember2023-09-300001018963ati:JamesCDiggsMember2023-07-012023-09-30

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
 FORM 10-Q
QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the Quarterly Period Ended September 30, 2023
OR
TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the Transition Period From                      to                     
Commission File Number 1-12001
 ATI Inc.
(Exact name of registrant as specified in its charter)
Delaware25-1792394
(State or other jurisdiction of(I.R.S. Employer
incorporation or organization)Identification No.)
2021 McKinney Avenue
Dallas,Texas75201
(Address of Principal Executive Offices)(Zip Code)
(800) 289-7454
(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:
Title of each classTrading SymbolName of each exchange on which registered
Common stock, par value $0.10ATINew York Stock Exchange
Indicate by check mark whether the Registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.     Yes      No  
Indicate by check mark whether the Registrant submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).     Yes      No  
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act.
Large accelerated filerAccelerated filer
Non-accelerated filerSmaller reporting company
Emerging growth company
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.
Indicate by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).     Yes      No  
At October 13, 2023, the registrant had outstanding 127,577,212 shares of its Common Stock.



ATI INC.
SEC FORM 10-Q
Quarter Ended September 30, 2023
INDEX
 Page No.
PART I. - FINANCIAL INFORMATION
Item 1. Financial Statements
Consolidated Balance Sheets
Consolidated Statements of Operations
Consolidated Statements of Comprehensive Income (Loss)
Consolidated Statements of Cash Flows
Statements of Changes in Consolidated Equity
Notes to Consolidated Financial Statements
Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations
Item 3. Quantitative and Qualitative Disclosures About Market Risk
Item 4. Controls and Procedures
PART II. - OTHER INFORMATION
Item 1. Legal Proceedings
Item 1A. Risk Factors
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds
Item 5. Other Information
Item 6. Exhibits
SIGNATURES



PART I. FINANCIAL INFORMATION
Item 1. Financial Statements
ATI Inc. and Subsidiaries
Consolidated Balance Sheets
(In millions, except share and per share amounts)
(Current period unaudited)
September 30,
2023
December 31,
2022
ASSETS
Current Assets:
Cash and cash equivalents$432.9 $584.0 
Accounts receivable, net 683.0 579.2 
Short-term contract assets56.6 64.1 
Inventories, net1,353.9 1,195.7 
Prepaid expenses and other current assets73.3 53.4 
Total Current Assets2,599.7 2,476.4 
Property, plant and equipment, net1,626.3 1,549.1 
Goodwill227.2 227.2 
Other assets277.9 192.9 
Total Assets$4,731.1 $4,445.6 
LIABILITIES AND EQUITY
Current Liabilities:
Accounts payable$435.0 $553.3 
Short-term contract liabilities110.2 149.1 
Short-term debt and current portion of long-term debt37.5 41.7 
Other current liabilities246.6 219.8 
Total Current Liabilities829.3 963.9 
Long-term debt2,147.7 1,706.3 
Accrued postretirement benefits173.2 184.9 
Pension liabilities39.7 225.6 
Other long-term liabilities185.3 207.7 
Total Liabilities3,375.2 3,288.4 
Equity:
ATI Stockholders’ Equity:
Preferred stock, par value $0.10: authorized-50,000,000 shares; issued-none
  
Common stock, par value $0.10: authorized-500,000,000 shares; issued-132,292,666 shares at September 30, 2023 and 131,392,262 shares at December 31, 2022; outstanding-127,576,395 shares at September 30, 2023 and 128,273,042 shares at December 31, 2022
13.2 13.1 
Additional paid-in capital1,689.5 1,668.1 
Retained earnings398.7 176.9 
Treasury stock: 4,716,271 shares at September 30, 2023 and 3,119,220 shares at December 31, 2022
(153.6)(87.0)
Accumulated other comprehensive loss, net of tax(708.9)(725.2)
Total ATI stockholders’ equity1,238.9 1,045.9 
Noncontrolling interests117.0 111.3 
Total Equity1,355.9 1,157.2 
Total Liabilities and Equity$4,731.1 $4,445.6 

The accompanying notes are an integral part of these statements.
1


ATI Inc. and Subsidiaries
Consolidated Statements of Operations
(In millions, except per share amounts)
(Unaudited)
 
Three months ended September 30,Nine months ended September 30,
 2023202220232022
Sales$1,025.6 $1,032.0 $3,109.7 $2,825.6 
Cost of sales831.0 848.2 2,512.8 2,297.1 
Gross profit 194.6 183.8 596.9 528.5 
Selling and administrative expenses69.8 73.2 235.8 220.7 
Restructuring charges (credits)(0.5)(2.6)2.2 (5.0)
Loss on asset sales and sales of businesses, net0.1  0.8 134.2 
Operating income 125.2 113.2 358.1 178.6 
Nonoperating retirement benefit expense(16.9)(6.5)(50.6)(18.9)
Interest expense, net(23.8)(20.8)(65.0)(67.8)
Other income (expense), net (18.5)1.3 (15.3)
Income before income taxes84.5 67.4 243.8 76.6 
Income tax provision 4.9 3.0 12.9 11.3 
Net income 79.6 64.4 230.9 65.3 
Less: Net income attributable to noncontrolling interests3.9 3.3 9.1 11.3 
Net income attributable to ATI$75.7 $61.1 $221.8 $54.0 
Basic net income attributable to ATI per common share$0.59 $0.47 $1.73 $0.43 
Diluted net income attributable to ATI per common share$0.52 $0.42 $1.53 $0.42 
The accompanying notes are an integral part of these statements.

2


ATI Inc. and Subsidiaries
Consolidated Statements of Comprehensive Income (Loss)
(In millions)
(Unaudited)
 
Three months ended September 30,Nine months ended September 30,
 2023202220232022
Net income $79.6 $64.4 $230.9 $65.3 
Currency translation adjustment
Unrealized net change arising during the period(9.2)(30.0)(14.0)(59.2)
Reclassification adjustment included in net income    20.0 
Total(9.2)(30.0)(14.0)(39.2)
Derivatives
Net derivatives gain (loss) on hedge transactions(3.2)7.7 (20.6)48.4 
Reclassification to net income of net realized loss (gain)1.8 (7.1)0.1 (32.5)
Income taxes on derivative transactions    
Total(1.4)0.6 (20.5)15.9 
Postretirement benefit plans
Actuarial loss
Amortization of net actuarial loss16.0 19.1 47.8 57.6 
Prior service cost
Amortization to net income of net prior service credits(0.1)(0.1)(0.4)(0.4)
Settlement loss included in net income    29.5 
Income taxes on postretirement benefit plans    
Total15.9 19.0 47.4 86.7 
Other comprehensive income (loss), net of tax5.3 (10.4)12.9 63.4 
Comprehensive income84.9 54.0 243.8 128.7 
Less: Comprehensive income (loss) attributable to noncontrolling interests1.8 (6.1)5.7 (7.1)
Comprehensive income attributable to ATI$83.1 $60.1 $238.1 $135.8 
The accompanying notes are an integral part of these statements.

3


ATI Inc. and Subsidiaries
Consolidated Statements of Cash Flows
(In millions)
(Unaudited)
 
Nine months ended September 30,
 20232022
Operating Activities:
Net income $230.9 $65.3 
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization106.6 107.1 
Share-based compensation21.5 20.1 
Deferred taxes2.2 2.2 
Net gains from disposal of property, plant and equipment(0.1)(1.0)
Loss on sales of businesses0.6 141.0 
Changes in operating assets and liabilities:
Inventories(158.2)(212.0)
Accounts receivable(104.0)(224.4)
Accounts payable(108.2)52.2 
Retirement benefits(241.0)2.4 
Accrued liabilities and other(81.6)(52.3)
Cash used in operating activities(331.3)(99.4)
Investing Activities:
Purchases of property, plant and equipment(147.3)(100.5)
Proceeds from disposal of property, plant and equipment3.3 1.5 
Transaction costs from sales of businesses, net of proceeds(0.3)(2.8)
Other1.1 0.8 
Cash used in investing activities(143.2)(101.0)
Financing Activities:
Borrowings on long-term debt425.0  
Payments on long-term debt and finance leases(22.0)(16.6)
Net payments under credit facilities(7.3)(16.0)
Debt issuance costs(6.1) 
Purchase of treasury stock(55.1)(104.9)
Sale of noncontrolling interests 0.9 
Dividends paid to noncontrolling interests (16.0)
Shares repurchased for income tax withholding on share-based compensation and other(11.1)(5.6)
Cash provided by (used in) financing activities323.4 (158.2)
Decrease in cash and cash equivalents(151.1)(358.6)
Cash and cash equivalents at beginning of period584.0 687.7 
Cash and cash equivalents at end of period$432.9 $329.1 
The accompanying notes are an integral part of these statements.

4


ATI Inc. and Subsidiaries
Statements of Changes in Consolidated Equity
(In millions)
(Unaudited)
ATI Stockholders
Common
Stock
Additional
Paid-In
Capital
Retained
Earnings
Treasury
Stock
Accumulated
Other
Comprehensive
Income (Loss)
Non-
controlling
Interests
Total
Equity
Balance, June 30, 2022$13.1 $1,656.6 $38.9 $(36.8)$(908.9)$131.0 $893.9 
Net income   61.1   3.3 64.4 
Other comprehensive loss— — — — (1.0)(9.4)(10.4)
Purchase of treasury stock —  (15.0)  (15.0)
Employee stock plans 5.6  (0.1)— — 5.5 
Balance, September 30, 2022$13.1 $1,662.2 $100.0 $(51.9)$(909.9)$124.9 $938.4 
Balance, June 30, 2023$13.2 $1,682.0 $323.0 $(107.9)$(716.3)$115.2 $1,309.2 
Net income   75.7   3.9 79.6 
Other comprehensive income (loss)— — — — 7.4 (2.1)5.3 
Purchase of treasury stock   (45.4)  (45.4)
Employee stock plans 7.5  (0.3)— — 7.2 
Balance, September 30, 2023$13.2 $1,689.5 $398.7 $(153.6)$(708.9)$117.0 $1,355.9 
ATI Stockholders
Common
Stock
Additional
Paid-In
Capital
Retained
Earnings
Treasury
Stock
Accumulated
Other
Comprehensive
Income (Loss)
Non-
controlling
Interests
Total
Equity
Balance, December 31, 2021$12.7 $1,596.7 $72.7 $(4.8)$(991.7)$147.1 $832.7 
Net income   54.0   11.3 65.3 
Other comprehensive income (loss)— — — 81.8 (18.4)63.4 
Purchase of treasury stock— — — (104.9)— — (104.9)
Conversion of convertible notes0.3 45.4 (26.7)63.5 — — 82.5 
Dividends paid to noncontrolling interest— — — — — (16.0)(16.0)
Sales of subsidiary shares to noncontrolling interest— — — — — 0.9 0.9 
Employee stock plans0.1 20.1  (5.7)— — 14.5 
Balance, September 30, 2022$13.1 $1,662.2 $100.0 $(51.9)$(909.9)$124.9 $938.4 
Balance, December 31, 2022$13.1 $1,668.1 $176.9 $(87.0)$(725.2)$111.3 $1,157.2 
Net income   221.8   9.1 230.9 
Other comprehensive income (loss)— — — — 16.3 (3.4)12.9 
Purchase of treasury stock— — — (55.5)— — (55.5)
Employee stock plans0.1 21.4  (11.1)— — 10.4 
Balance, September 30, 2023$13.2 $1,689.5 $398.7 $(153.6)$(708.9)$117.0 $1,355.9 

The accompanying notes are an integral part of these statements.
5


NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
Unaudited
Note 1. Accounting Policies
The interim consolidated financial statements include the accounts of ATI Inc. and its subsidiaries. Unless the context requires otherwise, “ATI” and “the Company” refer to ATI Inc. and its subsidiaries.
These unaudited consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles for interim financial information and with the instructions for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and note disclosures required by U.S. generally accepted accounting principles for complete financial statements. In management’s opinion, all adjustments (which include only normal recurring adjustments) considered necessary for a fair presentation have been included. These unaudited consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Company’s 2022 Annual Report on Form 10-K. The results of operations for these interim periods are not necessarily indicative of the operating results for any future period. The December 31, 2022 financial information has been derived from the Company’s audited consolidated financial statements.
New Accounting Pronouncements Adopted
In September 2022, the Financial Accounting Standards Board (FASB) issued new accounting guidance related to disclosures about supplier finance programs. Supplier finance programs allow a buyer to offer its suppliers the option for access to payment in advance of an invoice due date, which is paid by a third-party finance provider or intermediary on the basis of invoices that the buyer has confirmed as valid. This new guidance requires a buyer in a supplier finance program to disclose sufficient information about the program to allow a user of financial statements to understand the program’s nature, activity during the period, changes from period to period, and potential magnitude, using both qualitative and quantitative information about its supplier finance programs. This new guidance, with the exception of disclosures on rollforward information, is effective for the Company in fiscal year 2023. The Company adopted this new accounting guidance effective January 1, 2023. The rollforward information disclosures are effective for the Company in fiscal year 2024, with early adoption permitted. The Company did not early adopt this guidance. The adoption of these changes did not have an impact on the Company’s consolidated financial statements other than disclosure requirements which are included in Note 6.

6


Note 2. Revenue from Contracts with Customers

Disaggregation of Revenue
The Company operates in two business segments: High Performance Materials & Components (HPMC) and Advanced Alloys & Solutions (AA&S). Revenue is disaggregated within these two business segments by diversified global markets, primary geographical markets and diversified products. Comparative information regarding the Company’s overall revenues (in millions) by global and geographical markets for the third quarters and nine months ended September 30, 2023 and 2022 is included in the following tables.
(in millions)Third quarter ended
September 30, 2023September 30, 2022
HPMCAA&STotalHPMCAA&STotal
Diversified Global Markets:
Aerospace & Defense:
   Jet Engines- Commercial$312.5 $16.9 $329.4 $285.7 $26.9 $312.6 
   Airframes- Commercial104.0 99.6 203.6 49.8 81.6 131.4 
   Defense39.7 53.1 92.8 38.5 47.6 86.1 
   Total Aerospace & Defense456.2 169.6 625.8 374.0 156.1 530.1 
Energy:
   Oil & Gas2.5 84.5 87.0 6.9 120.2 127.1 
   Specialty Energy20.2 41.7 61.9 26.4 39.2 65.6 
   Total Energy22.7 126.2 148.9 33.3 159.4 192.7 
Automotive7.2 40.9 48.1 3.5 66.1 69.6 
Medical28.9 18.6 47.5 22.3 25.1 47.4 
Electronics0.6 44.2 44.8 0.7 47.8 48.5 
Construction/Mining7.7 32.3 40.0 9.5 38.3 47.8 
Food Equipment & Appliances 16.2 16.2 0.2 45.0 45.2 
Other16.2 38.1 54.3 14.1 36.6 50.7 
Total$539.5 $486.1 $1,025.6 $457.6 $574.4 $1,032.0 
(in millions)Nine months ended
September 30, 2023September 30, 2022
HPMCAA&STotalHPMCAA&STotal
Diversified Global Markets:
Aerospace & Defense:
   Jet Engines- Commercial$914.2 $67.0 $981.2 $696.1 $61.8 $757.9 
   Airframes- Commercial242.0 295.7 537.7 130.9 200.3 331.2 
   Defense131.6 157.8 289.4 120.6 123.6 244.2 
   Total Aerospace & Defense1,287.8 520.5 1,808.3 947.6 385.7 1,333.3 
Energy:
   Oil & Gas8.6 317.2 325.8 32.1 323.3 355.4 
   Specialty Energy75.0 137.8 212.8 88.0 109.3 197.3 
   Total Energy83.6 455.0 538.6 120.1 432.6 552.7 
Automotive19.5 140.8 160.3 8.7 227.4 236.1 
Construction/Mining26.9 101.9 128.8 25.8 113.9 139.7 
Medical70.7 53.7 124.4 52.3 70.8 123.1 
Electronics1.8 113.4 115.2 1.9 147.6 149.5 
Food Equipment & Appliances 58.6 58.6 0.2 141.7 141.9 
Other47.4 128.1 175.5 38.7 110.6 149.3 
Total$1,537.7 $1,572.0 $3,109.7 $1,195.3 $1,630.3 $2,825.6 
7


(in millions)Third quarter ended
September 30, 2023September 30, 2022
HPMCAA&STotalHPMCAA&STotal
Primary Geographical Market:
United States$242.6 $314.2 $556.8 $221.6 $395.5 $617.1 
Europe217.7 49.7 267.4 147.0 53.2 200.2 
Asia37.8 103.4 141.2 60.7 108.9 169.6 
Canada13.1 10.4 23.5 10.0 9.5 19.5 
South America, Middle East and other28.3 8.4 36.7 18.3 7.3 25.6 
Total$539.5 $486.1 $1,025.6 $457.6 $574.4 $1,032.0 
(in millions)Nine months ended
September 30, 2023September 30, 2022
HPMCAA&STotalHPMCAA&STotal
Primary Geographical Market:
United States$661.1 $1,052.3 $1,713.4 $557.8 $1,105.6 $1,663.4 
Europe619.7 137.7 757.4 403.3 140.6 543.9 
Asia132.8 316.4 449.2 155.4 328.4 483.8 
Canada41.7 34.9 76.6 33.0 29.9 62.9 
South America, Middle East and other82.4 30.7 113.1 45.8 25.8 71.6 
Total$1,537.7 $1,572.0 $3,109.7 $1,195.3 $1,630.3 $2,825.6 
Comparative information regarding the Company’s major products based on their percentages of sales is included in the following table. Hot-Rolling and Processing Facility (HRPF) conversion service sales in the AA&S segment are excluded from this presentation.
Third quarter ended
September 30, 2023September 30, 2022
HPMCAA&STotalHPMCAA&STotal
Diversified Products and Services:
     Nickel-based alloys and specialty alloys42 %52 %47 %52 %57 %54 %
     Titanium and titanium-based alloys24 %13 %19 %16 %7 %11 %
     Precision forgings, castings and components33 % %18 %32 % %15 %
     Precision rolled strip products1 %19 %9 % %22 %12 %
     Zirconium and related alloys %16 %7 % %14 %8 %
Total100 %100 %100 %100 %100 %100 %
Nine months ended
September 30, 2023September 30, 2022
HPMCAA&STotalHPMCAA&STotal
Diversified Products and Services:
     Nickel-based alloys and specialty alloys45 %56 %50 %50 %55 %52 %
     Precision forgings, castings and components33 % %17 %34 % %15 %
     Titanium and titanium-based alloys21 %11 %16 %16 %6 %11 %
     Precision rolled strip products1 %18 %9 % %25 %14 %
     Zirconium and related alloys %15 %8 % %14 %8 %
Total100 %100 %100 %100 %100 %100 %
The Company maintained a backlog of confirmed orders totaling $3.6 billion and $2.7 billion at September 30, 2023 and 2022, respectively. Due to the structure of the Company’s long-term agreements, approximately 70% of this backlog at September 30, 2023 represented booked orders with performance obligations that will be satisfied within the next 12 months. The backlog does not reflect any elements of variable consideration.

8


Contract balances
As of September 30, 2023 and December 31, 2022, accounts receivable with customers were $686.7 million and $586.9 million, respectively. The following represents the rollforward of accounts receivable - reserve for doubtful accounts and contract assets and liabilities for the nine months ended September 30, 2023 and 2022:
(in millions)
Accounts Receivable - Reserve for Doubtful AccountsSeptember 30,
2023
September 30,
2022
Balance as of beginning of fiscal year