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Financial Information for Subsidiary and Guarantor Parent (I.S.) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Income Statement [Abstract] |  |
Sales | $ 1,125.5 us-gaap_SalesRevenueGoodsNet | $ 987.3 us-gaap_SalesRevenueGoodsNet
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 (loss) before interest, other income and income taxes | 46.4 us-gaap_OperatingIncomeLoss | 2.5 us-gaap_OperatingIncomeLoss
Interest income (expense), net | (26.7)ati_InterestExpenseNet | (29.1)ati_InterestExpenseNet
Other income (loss) including equity in income of unconsolidated subsidiaries | 0.9 us-gaap_OtherNonoperatingIncomeExpense | 0.6 us-gaap_OtherNonoperatingIncomeExpense
Income (loss) from continuing operations before income tax provision (benefit) | 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
Comprehensive income (loss) attributable to ATI | 10.6 us-gaap_ComprehensiveIncomeNetOfTax | (1.0)us-gaap_ComprehensiveIncomeNetOfTax
Parent Company |  |
Income Statement [Abstract] |  |
Sales | 0 us-gaap_SalesRevenueGoodsNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_SalesRevenueGoodsNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cost of sales | 2.2 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 12.3 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Selling and administrative expenses | 25.8 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 27.1 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income (loss) before interest, other income and income taxes | (28.0)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (39.4)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest income (expense), net | (28.0)ati_InterestExpenseNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (28.5)ati_InterestExpenseNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other income (loss) including equity in income of unconsolidated subsidiaries | 76.6 us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 41.9 us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income (loss) from continuing operations before income tax provision (benefit) | 20.6 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (26.0)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income tax provision (benefit) | 8.0 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (10.0)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income (loss) from continuing operations | 12.6 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (16.0)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income (loss) from discontinued operations, net of tax | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1.9)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income (loss) | 12.6 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (17.9)us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Less: Net income attributable to noncontrolling interests | 0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income (loss) attributable to ATI | 12.6 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (17.9)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Comprehensive income (loss) attributable to ATI | 13.0 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (0.8)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Subsidiaries |  |
Income Statement [Abstract] |  |
Sales | 508.5 us-gaap_SalesRevenueGoodsNet / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 427.9 us-gaap_SalesRevenueGoodsNet / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Cost of sales | 504.0 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 439.6 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Selling and administrative expenses | 11.7 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 10.1 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Income (loss) before interest, other income and income taxes | (7.2)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (21.8)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Interest income (expense), net | (12.2)ati_InterestExpenseNet / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (10.6)ati_InterestExpenseNet / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Other income (loss) including equity in income of unconsolidated subsidiaries | 0.4 us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 0.3 us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Income (loss) from continuing operations before income tax provision (benefit) | (19.0)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (32.1)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Income tax provision (benefit) | (6.6)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (11.3)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Income (loss) from continuing operations | (12.4)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (20.8)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Income (loss) from discontinued operations, net of tax | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Net income (loss) | (12.4)us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (20.8)us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Less: Net income attributable to noncontrolling interests | 0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Net income (loss) attributable to ATI | (12.4)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (20.8)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Comprehensive income (loss) attributable to ATI | (9.1)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (18.8)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
NonGuarantor Subsidiaries |  |
Income Statement [Abstract] |  |
Sales | 617.0 us-gaap_SalesRevenueGoodsNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 559.4 us-gaap_SalesRevenueGoodsNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Cost of sales | 509.8 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 465.2 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Selling and administrative expenses | 25.6 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 30.5 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Income (loss) before interest, other income and income taxes | 81.6 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 63.7 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Interest income (expense), net | 13.5 ati_InterestExpenseNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 10.0 ati_InterestExpenseNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Other income (loss) including equity in income of unconsolidated subsidiaries | 0.6 us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0.6 us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Income (loss) from continuing operations before income tax provision (benefit) | 95.7 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 74.3 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Income tax provision (benefit) | 34.1 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 26.4 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Income (loss) from continuing operations | 61.6 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 47.9 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Income (loss) from discontinued operations, net of tax | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (1.9)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Net income (loss) | 61.6 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 46.0 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Less: Net income attributable to noncontrolling interests | 2.6 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 2.1 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Net income (loss) attributable to ATI | 59.0 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 43.9 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Comprehensive income (loss) attributable to ATI | 37.8 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 42.5 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Consolidation Eliminations |  |
Income Statement [Abstract] |  |
Sales | 0 us-gaap_SalesRevenueGoodsNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_SalesRevenueGoodsNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Cost of sales | 0 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Selling and administrative expenses | 0 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Income (loss) before interest, other income and income taxes | 0 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Interest income (expense), net | 0 ati_InterestExpenseNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 ati_InterestExpenseNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Other income (loss) including equity in income of unconsolidated subsidiaries | (76.7)us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (42.2)us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Income (loss) from continuing operations before income tax provision (benefit) | (76.7)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (42.2)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Income tax provision (benefit) | (27.5)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (15.1)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Income (loss) from continuing operations | (49.2)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (27.1)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Income (loss) from discontinued operations, net of tax | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 1.9 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Net income (loss) | (49.2)us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (25.2)us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Less: Net income attributable to noncontrolling interests | 0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Net income (loss) attributable to ATI | (49.2)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (25.2)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Comprehensive income (loss) attributable to ATI | $ (31.1)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | $ (23.9)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember

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