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Business Segments (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Segment Reporting Information [Line Items] |  |
Sales | $ 1,125.5 us-gaap_SalesRevenueGoodsNet | $ 987.3 us-gaap_SalesRevenueGoodsNet
Operating profit (loss): | 83.8 ati_SegmentOperatingProfitLoss | 43.5 ati_SegmentOperatingProfitLoss
Corporate expenses | (11.8)ati_CorporateExpenses | (11.5)ati_CorporateExpenses
Interest expense, net | (26.7)ati_InterestExpenseNet | (29.1)ati_InterestExpenseNet
Closed company and other expenses | (5.4)ati_OtherExpense | (5.0)ati_OtherExpense
Retirement benefit expense | (19.3)ati_RetirementBenefitExpense | (23.9)ati_RetirementBenefitExpense
Income (loss) from continuing operations before income tax provision (benefit) | 20.6 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | (26.0)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Interest Costs Capitalized | 0.6 us-gaap_InterestCostsCapitalized | 2.3 us-gaap_InterestCostsCapitalized
High Performance Materials & Components |  |
Segment Reporting Information [Line Items] |  |
Total sales: | 542.8 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ati_HighPerformanceMaterialsComponentsMember | 484.4 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ati_HighPerformanceMaterialsComponentsMember
Operating profit (loss): | 75.9 ati_SegmentOperatingProfitLoss / us-gaap_StatementBusinessSegmentsAxis = ati_HighPerformanceMaterialsComponentsMember | 69.1 ati_SegmentOperatingProfitLoss / us-gaap_StatementBusinessSegmentsAxis = ati_HighPerformanceMaterialsComponentsMember
Flat Rolled Products |  |
Segment Reporting Information [Line Items] |  |
Total sales: | 582.7 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ati_FlatRolledProductsMember | 502.9 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ati_FlatRolledProductsMember
Operating profit (loss): | 7.9 ati_SegmentOperatingProfitLoss / us-gaap_StatementBusinessSegmentsAxis = ati_FlatRolledProductsMember | (25.6)ati_SegmentOperatingProfitLoss / us-gaap_StatementBusinessSegmentsAxis = ati_FlatRolledProductsMember
Operating Segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Total sales: | 1,169.6 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 1,033.7 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Operating Segments [Member] | High Performance Materials & Components |  |
Segment Reporting Information [Line Items] |  |
Total sales: | 564.9 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = ati_HighPerformanceMaterialsComponentsMember | 504.1 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = ati_HighPerformanceMaterialsComponentsMember
Operating Segments [Member] | Flat Rolled Products |  |
Segment Reporting Information [Line Items] |  |
Total sales: | 604.7 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = ati_FlatRolledProductsMember | 529.6 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = ati_FlatRolledProductsMember
Intersegment Eliminations [Member] |  |
Segment Reporting Information [Line Items] |  |
Total sales: | 44.1 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | 46.4 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember
Intersegment Eliminations [Member] | High Performance Materials & Components |  |
Segment Reporting Information [Line Items] |  |
Total sales: | 22.1 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = ati_HighPerformanceMaterialsComponentsMember | 19.7 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = ati_HighPerformanceMaterialsComponentsMember
Intersegment Eliminations [Member] | Flat Rolled Products |  |
Segment Reporting Information [Line Items] |  |
Total sales: | $ 22.0 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = ati_FlatRolledProductsMember | $ 26.7 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = ati_FlatRolledProductsMember

X
- Definition corporate office expenses not allocable to business segments + References No definition available. + Details
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- Definition Net interest expense - the cost of borrowed funds as interest charged against earnings during the period net of interest income derived from investments in debt securities and on cash and cash equivalents. + References No definition available. + Details
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- Definition Other expense, net of gains on asset sales primarily includes charges incurred in connection with closed operations and other non-operating income or expense + References No definition available. + Details
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- Definition Represents defined benefit plan pension expense, and other postretirement benefit expense for both defined benefit and defined contribution plans + References No definition available. + Details
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- Definition Business segment operating profit, which excludes costs for restructuring charges, retirement benefit income or expense, corproate expenses, interest expense, debt extinguishment costs and costs associated with closed operations. These costs are excluded for segment reporting to provide a profit measure based on what management considers to be controllable costs at the business segment level + References No definition available. + Details
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- Definition Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of interest capitalized during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Allowance for Funds Used during Construction -URI http://asc.fasb.org/extlink&oid=6504829 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(a)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Details
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