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Selected Quarterly Financial Data (Unaudited) - Narrative (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012	Dec. 31, 2014
Unusual Or Infrequent Item [Line Items]
Restructuring costs, net of tax	$ 41.2ati_RestructuringChargesNetofTax	$ 41.2ati_RestructuringChargesNetofTax
Tungsten Materials Business [Member]
Unusual Or Infrequent Item [Line Items]
Gain on disposed operation net of tax		261.4us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = ati_TungstenMaterialsBusinessMember
Iron Castings and Fabricated Components Businesses [Member]
Unusual Or Infrequent Item [Line Items]
Restructuring costs, net of tax	6.1ati_RestructuringChargesNetofTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = ati_IronCastingsandFabricatedComponentsBusinessesMember	11.9ati_RestructuringChargesNetofTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = ati_IronCastingsandFabricatedComponentsBusinessesMember	5.8ati_RestructuringChargesNetofTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = ati_IronCastingsandFabricatedComponentsBusinessesMember
Iron Castings Business [Member]
Unusual Or Infrequent Item [Line Items]
Restructuring costs, net of tax				8.8ati_RestructuringChargesNetofTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = ati_IronCastingsBusinessMember
Other Postretirement Benefits [Member]
Unusual Or Infrequent Item [Line Items]
Settlements and curtailments gains					25.5us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1 / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Settlements and curtailments gains net of tax					$ 18.4ati_DefinedBenefitPlanRecognizedNetGainLossDuetoSettlementsandCurtailmentsNetofTax / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember

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- Definition

Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments, Net of Tax

+ References

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- Definition

Restructuring Charges, Net of Tax

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- Definition

Amount of net gain (loss) recognized in net periodic benefit cost due to settlements and curtailments. Curtailments result from an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services. Settlements result from an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (h)(7)

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- Definition

Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 45

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759



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-Name Accounting Standards Codification

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