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Financial Information for Subsidiary and Guarantor Parent (I.S.) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]                      
Sales $ 1,047.5us-gaap_SalesRevenueGoodsNet $ 1,069.6us-gaap_SalesRevenueGoodsNet $ 1,119.0us-gaap_SalesRevenueGoodsNet $ 987.3us-gaap_SalesRevenueGoodsNet $ 915.3us-gaap_SalesRevenueGoodsNet $ 972.4us-gaap_SalesRevenueGoodsNet $ 1,056.8us-gaap_SalesRevenueGoodsNet $ 1,099.0us-gaap_SalesRevenueGoodsNet $ 4,223.4us-gaap_SalesRevenueGoodsNet $ 4,043.5us-gaap_SalesRevenueGoodsNet $ 4,666.9us-gaap_SalesRevenueGoodsNet
Cost of sales                 3,844.8us-gaap_CostOfGoodsSold 3,790.9us-gaap_CostOfGoodsSold 4,041.4us-gaap_CostOfGoodsSold
Selling and administrative expenses                 272.5us-gaap_SellingGeneralAndAdministrativeExpense 276.4us-gaap_SellingGeneralAndAdministrativeExpense 321.6us-gaap_SellingGeneralAndAdministrativeExpense
Restructuring costs                 0us-gaap_RestructuringCharges 67.5us-gaap_RestructuringCharges 0us-gaap_RestructuringCharges
Income (loss) before interest, other income and income taxes                 106.1us-gaap_OperatingIncomeLoss (91.3)us-gaap_OperatingIncomeLoss 303.9us-gaap_OperatingIncomeLoss
Interest expense, net                 (108.7)ati_InterestExpenseNet (65.2)ati_InterestExpenseNet (71.6)ati_InterestExpenseNet
Other income (expense) including equity in income of unconsolidated subsidiaries                 4.1us-gaap_OtherNonoperatingIncomeExpense 1.7us-gaap_OtherNonoperatingIncomeExpense 0us-gaap_OtherNonoperatingIncomeExpense
Income (loss) from continuing operations before income taxes                 1.5us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (154.8)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 232.3us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax provision (benefit)                 (8.7)us-gaap_IncomeTaxExpenseBenefit (63.6)us-gaap_IncomeTaxExpenseBenefit 72.4us-gaap_IncomeTaxExpenseBenefit
Income (loss) from continuing operations                 10.2us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest (91.2)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest 159.9us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Income (loss) from discontinued operations, net of tax                 (0.6)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 252.8us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 7.9us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Net income 25.3us-gaap_ProfitLoss 2.9us-gaap_ProfitLoss (0.7)us-gaap_ProfitLoss (17.9)us-gaap_ProfitLoss 175.6us-gaap_ProfitLoss (32.2)us-gaap_ProfitLoss 6.6us-gaap_ProfitLoss 11.6us-gaap_ProfitLoss 9.6us-gaap_ProfitLoss 161.6us-gaap_ProfitLoss 167.8us-gaap_ProfitLoss
Less: Net income attributable to noncontrolling interests                 12.2us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 7.6us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 9.4us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net income (loss) attributable to ATI 22.1us-gaap_NetIncomeLoss (0.7)us-gaap_NetIncomeLoss (4.0)us-gaap_NetIncomeLoss (20.0)us-gaap_NetIncomeLoss 173.4us-gaap_NetIncomeLoss (33.8)us-gaap_NetIncomeLoss 4.4us-gaap_NetIncomeLoss 10.0us-gaap_NetIncomeLoss (2.6)us-gaap_NetIncomeLoss 154.0us-gaap_NetIncomeLoss 158.4us-gaap_NetIncomeLoss
Guarantor Parent [Member]                      
Condensed Financial Statements, Captions [Line Items]                      
Sales                 0us-gaap_SalesRevenueGoodsNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_SalesRevenueGoodsNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_SalesRevenueGoodsNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cost of sales                 45.3us-gaap_CostOfGoodsSold
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
75.2us-gaap_CostOfGoodsSold
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
57.0us-gaap_CostOfGoodsSold
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Selling and administrative expenses                 103.9us-gaap_SellingGeneralAndAdministrativeExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
124.3us-gaap_SellingGeneralAndAdministrativeExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
144.2us-gaap_SellingGeneralAndAdministrativeExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Restructuring costs                   1.1us-gaap_RestructuringCharges
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Income (loss) before interest, other income and income taxes                 (149.2)us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(200.6)us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(201.2)us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Interest expense, net                 (111.0)ati_InterestExpenseNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(63.4)ati_InterestExpenseNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(60.7)ati_InterestExpenseNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Other income (expense) including equity in income of unconsolidated subsidiaries                 261.7us-gaap_OtherNonoperatingIncomeExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
109.2us-gaap_OtherNonoperatingIncomeExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
494.2us-gaap_OtherNonoperatingIncomeExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Income (loss) from continuing operations before income taxes                 1.5us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(154.8)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
232.3us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Income tax provision (benefit)                 (8.7)us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(63.6)us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
72.4us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Income (loss) from continuing operations                 10.2us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(91.2)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
159.9us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Income (loss) from discontinued operations, net of tax                 (0.6)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
252.8us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
7.9us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net income                 9.6us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
161.6us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
167.8us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Less: Net income attributable to noncontrolling interests                 0us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net income (loss) attributable to ATI                 9.6us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
161.6us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
167.8us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Subsidiary [Member]                      
Condensed Financial Statements, Captions [Line Items]                      
Sales                 1,878.0us-gaap_SalesRevenueGoodsNet
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
1,769.4us-gaap_SalesRevenueGoodsNet
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
2,031.8us-gaap_SalesRevenueGoodsNet
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Cost of sales                 1,874.8us-gaap_CostOfGoodsSold
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
1,748.8us-gaap_CostOfGoodsSold
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
1,888.2us-gaap_CostOfGoodsSold
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Selling and administrative expenses                 44.0us-gaap_SellingGeneralAndAdministrativeExpense
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
34.9us-gaap_SellingGeneralAndAdministrativeExpense
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
42.6us-gaap_SellingGeneralAndAdministrativeExpense
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Restructuring costs                   15.7us-gaap_RestructuringCharges
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
Income (loss) before interest, other income and income taxes                 (40.8)us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
(30.0)us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
101.0us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Interest expense, net                 (44.9)ati_InterestExpenseNet
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
(37.2)ati_InterestExpenseNet
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
(10.5)ati_InterestExpenseNet
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Other income (expense) including equity in income of unconsolidated subsidiaries                 1.1us-gaap_OtherNonoperatingIncomeExpense
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
0.9us-gaap_OtherNonoperatingIncomeExpense
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
(21.5)us-gaap_OtherNonoperatingIncomeExpense
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Income (loss) from continuing operations before income taxes                 (84.6)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
(66.3)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
69.0us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Income tax provision (benefit)                 (29.3)us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
(20.0)us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
27.5us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Income (loss) from continuing operations                 (55.3)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
(46.3)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
41.5us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Income (loss) from discontinued operations, net of tax                 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Net income                 (55.3)us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
(46.3)us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
41.5us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Less: Net income attributable to noncontrolling interests                 0us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
0us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
0us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Net income (loss) attributable to ATI                 (55.3)us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
(46.3)us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
41.5us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Non-Guarantor Subsidiaries [Member]                      
Condensed Financial Statements, Captions [Line Items]                      
Sales                 2,345.4us-gaap_SalesRevenueGoodsNet
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
2,274.1us-gaap_SalesRevenueGoodsNet
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
2,635.1us-gaap_SalesRevenueGoodsNet
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Cost of sales                 1,924.7us-gaap_CostOfGoodsSold
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
1,966.9us-gaap_CostOfGoodsSold
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
2,096.2us-gaap_CostOfGoodsSold
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Selling and administrative expenses                 124.6us-gaap_SellingGeneralAndAdministrativeExpense
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
117.2us-gaap_SellingGeneralAndAdministrativeExpense
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
134.8us-gaap_SellingGeneralAndAdministrativeExpense
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Restructuring costs                   50.7us-gaap_RestructuringCharges
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Income (loss) before interest, other income and income taxes                 296.1us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
139.3us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
404.1us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Interest expense, net                 47.2ati_InterestExpenseNet
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
35.4ati_InterestExpenseNet
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(0.4)ati_InterestExpenseNet
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Other income (expense) including equity in income of unconsolidated subsidiaries                 2.9us-gaap_OtherNonoperatingIncomeExpense
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0.8us-gaap_OtherNonoperatingIncomeExpense
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
31.8us-gaap_OtherNonoperatingIncomeExpense
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Income (loss) from continuing operations before income taxes                 346.2us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
175.5us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
435.5us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Income tax provision (benefit)                 116.7us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
40.4us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
168.7us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Income (loss) from continuing operations                 229.5us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
135.1us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
266.8us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Income (loss) from discontinued operations, net of tax                 (0.6)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
252.8us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
7.9us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Net income                 228.9us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
387.9us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
274.7us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Less: Net income attributable to noncontrolling interests                 12.2us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
7.6us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
9.4us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Net income (loss) attributable to ATI                 216.7us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
380.3us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
265.3us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Eliminations [Member]                      
Condensed Financial Statements, Captions [Line Items]                      
Sales                 0us-gaap_SalesRevenueGoodsNet
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_SalesRevenueGoodsNet
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_SalesRevenueGoodsNet
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
Cost of sales                 0us-gaap_CostOfGoodsSold
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_CostOfGoodsSold
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_CostOfGoodsSold
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
Selling and administrative expenses                 0us-gaap_SellingGeneralAndAdministrativeExpense
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_SellingGeneralAndAdministrativeExpense
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_SellingGeneralAndAdministrativeExpense
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
Income (loss) before interest, other income and income taxes                 0us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
Interest expense, net                 0ati_InterestExpenseNet
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0ati_InterestExpenseNet
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0ati_InterestExpenseNet
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
Other income (expense) including equity in income of unconsolidated subsidiaries                 (261.6)us-gaap_OtherNonoperatingIncomeExpense
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(109.2)us-gaap_OtherNonoperatingIncomeExpense
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(504.5)us-gaap_OtherNonoperatingIncomeExpense
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
Income (loss) from continuing operations before income taxes                 (261.6)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(109.2)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(504.5)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
Income tax provision (benefit)                 (87.4)us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(20.4)us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(196.2)us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
Income (loss) from continuing operations                 (174.2)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(88.8)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(308.3)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
Income (loss) from discontinued operations, net of tax                 0.6us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(252.8)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(7.9)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
Net income                 (173.6)us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(341.6)us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(316.2)us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
Less: Net income attributable to noncontrolling interests                 0us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
Net income (loss) attributable to ATI                 $ (173.6)us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
$ (341.6)us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
$ (316.2)us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember