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Derivative Financial Instruments and Hedging (Details2) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Derivatives Fair Value [Line Items] |  |
Derivative Fair Value Of Derivative Asset | $ 69.1 us-gaap_DerivativeFairValueOfDerivativeAsset | $ 59.9 us-gaap_DerivativeFairValueOfDerivativeAsset
Derivative Fair Value Of Derivative Liability | 43.6 us-gaap_DerivativeFairValueOfDerivativeLiability | 27.0 us-gaap_DerivativeFairValueOfDerivativeLiability
Designated as Hedging Instrument |  |
Derivatives Fair Value [Line Items] |  |
Derivative Fair Value Of Derivative Asset | 69.1 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 53.5 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Derivative Fair Value Of Derivative Liability | 43.2 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 27.0 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Not Designated as Hedging Instrument |  |
Derivatives Fair Value [Line Items] |  |
Derivative Fair Value Of Derivative Asset | 0 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 6.4 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Derivative Fair Value Of Derivative Liability | 0.4 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 0 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Prepaid expenses and other current assets | Nickel and other raw material contracts | Designated as Hedging Instrument |  |
Derivatives Fair Value [Line Items] |  |
Derivative Fair Value Of Derivative Asset | 0 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = ati_NickelAndOtherRawMaterialContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 1.1 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = ati_NickelAndOtherRawMaterialContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Prepaid expenses and other current assets | Foreign exchange contracts | Designated as Hedging Instrument |  |
Derivatives Fair Value [Line Items] |  |
Derivative Fair Value Of Derivative Asset | 23.1 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 23.6 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Prepaid expenses and other current assets | Foreign exchange contracts | Not Designated as Hedging Instrument |  |
Derivatives Fair Value [Line Items] |  |
Derivative Fair Value Of Derivative Asset | 0 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 6.4 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Other assets | Nickel and other raw material contracts | Designated as Hedging Instrument |  |
Derivatives Fair Value [Line Items] |  |
Derivative Fair Value Of Derivative Asset | 0 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = ati_NickelAndOtherRawMaterialContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 0.5 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = ati_NickelAndOtherRawMaterialContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Other assets | Foreign exchange contracts | Designated as Hedging Instrument |  |
Derivatives Fair Value [Line Items] |  |
Derivative Fair Value Of Derivative Asset | 46.0 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 28.3 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Accrued liabilities | Nickel and other raw material contracts | Designated as Hedging Instrument |  |
Derivatives Fair Value [Line Items] |  |
Derivative Fair Value Of Derivative Liability | 9.9 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = us-gaap_AccruedLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = ati_NickelAndOtherRawMaterialContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 5.8 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = us-gaap_AccruedLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = ati_NickelAndOtherRawMaterialContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Accrued liabilities | Natural gas contracts | Designated as Hedging Instrument |  |
Derivatives Fair Value [Line Items] |  |
Derivative Fair Value Of Derivative Liability | 12.1 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = us-gaap_AccruedLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = ati_NaturalGasContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 10.2 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = us-gaap_AccruedLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = ati_NaturalGasContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Accrued liabilities | Electricity contracts | Designated as Hedging Instrument |  |
Derivatives Fair Value [Line Items] |  |
Derivative Fair Value Of Derivative Liability | 0 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = us-gaap_AccruedLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = ati_ElectricityContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 0.1 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = us-gaap_AccruedLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = ati_ElectricityContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Accrued liabilities | Foreign exchange contracts | Not Designated as Hedging Instrument |  |
Derivatives Fair Value [Line Items] |  |
Derivative Fair Value Of Derivative Liability | 0.4 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = us-gaap_AccruedLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 0 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = us-gaap_AccruedLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Other long-term liabilities | Nickel and other raw material contracts | Designated as Hedging Instrument |  |
Derivatives Fair Value [Line Items] |  |
Derivative Fair Value Of Derivative Liability | 9.4 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = ati_NickelAndOtherRawMaterialContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 3.0 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = ati_NickelAndOtherRawMaterialContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Other long-term liabilities | Natural gas contracts | Designated as Hedging Instrument |  |
Derivatives Fair Value [Line Items] |  |
Derivative Fair Value Of Derivative Liability | $ 11.8 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = ati_NaturalGasContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | $ 7.9 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = ati_NaturalGasContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember

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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=51814546&loc=SL51823488-111719 + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=51814546&loc=SL51823488-111719 + Details
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