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Business Segments - Narrative (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Total direct international sales	$ 1,607.5ati_RevenueFromInternationalSales	$ 1,585.1ati_RevenueFromInternationalSales	$ 1,705.7ati_RevenueFromInternationalSales
Sales by U.S. operations to foreign countries	1,201.8ati_EntityWideDisclosureOnGeographicAreasRevenueFromExternalForeignCustomersAttributedToEntitysCountryOfDomicile	1,175.1ati_EntityWideDisclosureOnGeographicAreasRevenueFromExternalForeignCustomersAttributedToEntitysCountryOfDomicile	1,262.9ati_EntityWideDisclosureOnGeographicAreasRevenueFromExternalForeignCustomersAttributedToEntitysCountryOfDomicile
Inventory valuation reserve		55.5ati_InventoryValuationReservePeriodCharge
LIFO-related net realizable value charge	(4.8)us-gaap_InventoryLIFOReserve	(29.4)us-gaap_InventoryLIFOReserve
Inventory valuation reserves	68.8us-gaap_InventoryValuationReserves	84.3us-gaap_InventoryValuationReserves
Closed company and other expense	21.2ati_OtherExpense	14.2ati_OtherExpense	18.5ati_OtherExpense
Closed companies environmental costs	8.0ati_SegmentCorporateExpensesClosedCompaniesEnvironmentalCosts	3.9ati_SegmentCorporateExpensesClosedCompaniesEnvironmentalCosts	4.3ati_SegmentCorporateExpensesClosedCompaniesEnvironmentalCosts
Closed companies insurance obligations	3.8ati_SegmentCorporateExpensesClosedCompaniesInsuranceObligations
Other corporate expense	9.4ati_SegmentCorporateExpensesOther	10.3ati_SegmentCorporateExpensesOther	10.2ati_SegmentCorporateExpensesOther
Closed companies real estate costs			4.0ati_SegmentCorporateExpensesClosedCompaniesRealEstateCosts
Flat Rolled Products [Member]
Segment Reporting Information [Line Items]
Income (loss) from equity method investments	(8.9)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = ati_FlatRolledProductsMember	(7.1)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = ati_FlatRolledProductsMember	4.9us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = ati_FlatRolledProductsMember
Inventory valuation reserve	23.2ati_InventoryValuationReservePeriodCharge / us-gaap_StatementBusinessSegmentsAxis = ati_FlatRolledProductsMember	20.5ati_InventoryValuationReservePeriodCharge / us-gaap_StatementBusinessSegmentsAxis = ati_FlatRolledProductsMember
High Performance Materials & Components [Member]
Segment Reporting Information [Line Items]
Inventory valuation reserves	10.0us-gaap_InventoryValuationReserves / us-gaap_StatementBusinessSegmentsAxis = ati_HighPerformanceMaterialsComponentsMember	35.0us-gaap_InventoryValuationReserves / us-gaap_StatementBusinessSegmentsAxis = ati_HighPerformanceMaterialsComponentsMember
STAL Precision Stainless Steel Company Limited [Member]
Segment Reporting Information [Line Items]
Joint venture ownership percentage	60.00%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ati_STALPrecisionStainlessSteelCompanyLimitedMember
Corporate Joint Venture [Member]
Segment Reporting Information [Line Items]
Equity method investment ownership percentage	50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_CorporateJointVentureMember
Revenue from related parties	$ 75.3us-gaap_RevenueFromRelatedParties / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_CorporateJointVentureMember	$ 95.9us-gaap_RevenueFromRelatedParties / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_CorporateJointVentureMember	$ 77.1us-gaap_RevenueFromRelatedParties / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_CorporateJointVentureMember
Corporate Joint Venture [Member] | VSMPO [Member]
Segment Reporting Information [Line Items]
Joint venture ownership percentage by unaffiliated entity	50.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = ati_VSMPOMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_CorporateJointVentureMember

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- Definition

total foreign country sales from domicile operations

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Other expense, net of gains on asset sales primarily includes charges incurred in connection with closed operations and other non-operating income or expense

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Revenue From International Sales

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Environmental costs for closed operations

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Segment Corporate Expenses Closed Companies Insurance Obligations

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Real estate related costs for closed operations

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Other expenses including closed companies expenses

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of difference between inventory at lower of LIFO cost or market and inventory at lower of other inventory accounting method cost or market, for example, but not limited to, FIFO or average cost.

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