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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Income Statement [Abstract] |  |
Sales | $ 1,125.5 us-gaap_SalesRevenueGoodsNet | $ 987.3 us-gaap_SalesRevenueGoodsNet
Costs and expenses: |  |
Cost of sales | 1,016.0 us-gaap_CostOfGoodsSold | 917.1 us-gaap_CostOfGoodsSold
Selling and administrative expenses | 63.1 us-gaap_SellingGeneralAndAdministrativeExpense | 67.7 us-gaap_SellingGeneralAndAdministrativeExpense
Income before interest, other income and income taxes | 46.4 us-gaap_OperatingIncomeLoss | 2.5 us-gaap_OperatingIncomeLoss
Interest expense, net | (26.7)ati_InterestExpenseNet | (29.1)ati_InterestExpenseNet
Other income, net | 0.9 us-gaap_OtherNonoperatingIncomeExpense | 0.6 us-gaap_OtherNonoperatingIncomeExpense
Income (loss) from continuing operations before income taxes | 20.6 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | (26.0)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax provision (benefit) | 8.0 us-gaap_IncomeTaxExpenseBenefit | (10.0)us-gaap_IncomeTaxExpenseBenefit
Income (loss) from continuing operations | 12.6 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | (16.0)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Income (loss) from discontinued operations, net of tax | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (1.9)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Net income (loss) | 12.6 us-gaap_ProfitLoss | (17.9)us-gaap_ProfitLoss
Less: Net income attributable to noncontrolling interests | 2.6 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 2.1 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net income (loss) attributable to ATI | 10.0 us-gaap_NetIncomeLoss | (20.0)us-gaap_NetIncomeLoss
Continuing operations attributable to ATI per common share (in dollars per share) | $ 0.09 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ (0.17)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Discontinued operations attributable to ATI per common share (in dollars per share) | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ (0.02)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Basic net income (loss) attributable to ATI per common share (in dollars per share) | $ 0.09 us-gaap_EarningsPerShareBasic | $ (0.19)us-gaap_EarningsPerShareBasic
Continuing operations attributable to ATI per common share (in dollars per share) | $ 0.09 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ (0.17)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Discontinued operations attributable to ATI per common share (in dollars per share) | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ (0.02)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Diluted net income (loss) attributable to ATI per common share (in dollars per share) | $ 0.09 us-gaap_EarningsPerShareDiluted | $ (0.19)us-gaap_EarningsPerShareDiluted
Dividends declared per common share (in dollars per share) | $ 0.18 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.18 us-gaap_CommonStockDividendsPerShareDeclared
Income (loss) from continuing operations, net of tax | 10.0 us-gaap_IncomeLossFromContinuingOperations | (18.1)us-gaap_IncomeLossFromContinuingOperations
Loss from discontinued operations, net of tax | $ 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | $ (1.9)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity

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