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Accumulated Other Comprehensive Income (Loss) (Details2) (USD $)
In Millions, unless otherwise specified

12 Months Ended

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]

Amortization to net income of net prior service credits

$ (0.7)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax

$ (15.2)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax

$ (11.8)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax

Amortization of net actuarial loss

88.1us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax

129.0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax

119.8us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax

Cost of sales

(3,844.8)us-gaap_CostOfGoodsSold

(3,790.9)us-gaap_CostOfGoodsSold

(4,041.4)us-gaap_CostOfGoodsSold

Income (loss) from continuing operations before income taxes

1.5us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

(154.8)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

232.3us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

Income tax provision (benefit)

(8.7)us-gaap_IncomeTaxExpenseBenefit

(63.6)us-gaap_IncomeTaxExpenseBenefit

72.4us-gaap_IncomeTaxExpenseBenefit

Income (loss) from continuing operations

10.2us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest

(91.2)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest

159.9us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest

Income (loss) from discontinued operations, net of tax

(0.6)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity

252.8us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity

7.9us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity

Reclassification out of Accumulated Other Comprehensive Income [Member] | Post- retirement benefit plans [Member]

Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]

Amortization to net income of net prior service credits

0.7us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax
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^[1]

15.2us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax
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^[1]

Amortization of net actuarial loss

(88.1)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
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^[1]

(129.0)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
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= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember

^[1]

Income (loss) from continuing operations before income taxes

(87.4)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
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^[2]

(113.8)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
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^[2]

Income tax provision (benefit)

(33.6)us-gaap_IncomeTaxExpenseBenefit
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(43.8)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember

Income (loss) from continuing operations

(53.8)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
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(70.0)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
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/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember

Reclassification out of Accumulated Other Comprehensive Income [Member] | Currency translation adjustment [Member]

Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]

Income (loss) from continuing operations

(0.5)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
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= us-gaap_AccumulatedTranslationAdjustmentMember

^[2],[3]

Income (loss) from discontinued operations, net of tax

(1.5)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
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= us-gaap_AccumulatedTranslationAdjustmentMember

^[2],[3]

Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivatives [Member]

Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]

Income (loss) from continuing operations before income taxes

3.6us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
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/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember

^[2]

(14.0)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
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^[2]

Income tax provision (benefit)

1.4us-gaap_IncomeTaxExpenseBenefit
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(5.4)us-gaap_IncomeTaxExpenseBenefit
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/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember

Income (loss) from continuing operations

2.2us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
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= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
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= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember

(8.6)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember

Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivatives [Member] | Nickel and other raw material contracts [Member]

Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]

Cost of sales

(1.0)us-gaap_CostOfGoodsSold
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= ati_NickelAndOtherRawMaterialContractsMember
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/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember

^[4]

(8.8)us-gaap_CostOfGoodsSold
/ us-gaap_DerivativeInstrumentRiskAxis
= ati_NickelAndOtherRawMaterialContractsMember
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember

^[4]

Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivatives [Member] | Natural gas contracts [Member]

Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]

Cost of sales

3.4us-gaap_CostOfGoodsSold
/ us-gaap_DerivativeInstrumentRiskAxis
= ati_NaturalGasContractsMember
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember

^[4]

(3.8)us-gaap_CostOfGoodsSold
/ us-gaap_DerivativeInstrumentRiskAxis
= ati_NaturalGasContractsMember
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember

^[4]

Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivatives [Member] | Electricity contracts [Member]

Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]

Cost of sales

0.7us-gaap_CostOfGoodsSold
/ us-gaap_DerivativeInstrumentRiskAxis
= ati_ElectricityContractsMember
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
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^[4]

(0.3)us-gaap_CostOfGoodsSold
/ us-gaap_DerivativeInstrumentRiskAxis
= ati_ElectricityContractsMember
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
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/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember

^[4]

Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivatives [Member] | Foreign Exchange Contract [Member]

Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]

Cost of sales

$ 0.5us-gaap_CostOfGoodsSold
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
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^[4]

$ (1.1)us-gaap_CostOfGoodsSold
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^[4]

[1]	Amounts are included in the computation of pension and other postretirement benefit expense, which is reported in both cost of goods sold and selling and administrative expenses. For additional information, see Note 11.
[2]	For pretax items, positive amounts are income and negative amounts are expense in terms of the impact to net income. Tax effects are presented in conformity with ATI’s presentation in the consolidated statements of operations.
[3]	Amount in 2014 is included in other income, net, and amount in 2013 is included in discontinued operations as part of the gain on sale of the tungsten materials business (see Note 3).
[4]	Amounts are included in cost of goods sold in the period or periods the hedged item affects earnings. For additional information, see Note 9.

X

- Definition

Total costs related to goods produced and sold during the reporting period.

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- Definition

This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items, and noncontrolling interest.

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- Definition

Amount of income (loss) from a disposal group, net of income tax, reported as a separate component of income before extraordinary items after deduction or consideration of the amount allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount before tax of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) related to pension and other postretirement benefit plans.

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Amount before tax of reclassification adjustment from accumulated other comprehensive income (loss) for actuarial gain (loss) related to pension and other postretirement benefit plans.

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