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Financial Information for Subsidiary and Guarantor Parent (Cash Flow) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Statement of Cash Flows |  |
Cash flows provided by (used in) operating activities | $ 12.0 us-gaap_NetCashProvidedByUsedInOperatingActivities | $ (56.9)us-gaap_NetCashProvidedByUsedInOperatingActivities
Investing Activities: |  |
Purchases of property, plant and equipment | (22.6)us-gaap_PaymentsToAcquireProductiveAssets | (39.6)us-gaap_PaymentsToAcquireProductiveAssets
Purchases of businesses, net of cash acquired | 0 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | (71.1)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Net receipts/(payments) on intercompany activity | 0 ati_ProceedsPaymentsfromIntercompanyActivitesInvestingActivities | 0 ati_ProceedsPaymentsfromIntercompanyActivitesInvestingActivities
Asset disposals and other | 0.1 us-gaap_PaymentsForProceedsFromOtherInvestingActivities | 1.8 us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Cash used in investing activities | (22.5)us-gaap_NetCashProvidedByUsedInInvestingActivities | (108.9)us-gaap_NetCashProvidedByUsedInInvestingActivities
Financing Activities: |  |
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities | (0.3)us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities | (0.1)us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities
Net receipts/(payments) on intercompany activity | 0 ati_Netreceiptspaymentsonintercompanyactivity | 0 ati_Netreceiptspaymentsonintercompanyactivity
Dividends paid to stockholders | (19.3)us-gaap_PaymentsOfDividendsCommonStock | (19.3)us-gaap_PaymentsOfDividendsCommonStock
Other | (1.7)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities | (4.0)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Cash used in financing activities | (21.0)us-gaap_NetCashProvidedByUsedInFinancingActivities | (23.3)us-gaap_NetCashProvidedByUsedInFinancingActivities
Decrease in cash and cash equivalents | (31.5)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (189.1)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Parent Company |  |
Statement of Cash Flows |  |
Cash flows provided by (used in) operating activities | (26.3)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (29.7)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Investing Activities: |  |
Purchases of property, plant and equipment | 0 us-gaap_PaymentsToAcquireProductiveAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_PaymentsToAcquireProductiveAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Purchases of businesses, net of cash acquired |  | 0 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net receipts/(payments) on intercompany activity | 0 ati_ProceedsPaymentsfromIntercompanyActivitesInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 ati_ProceedsPaymentsfromIntercompanyActivitesInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Asset disposals and other | 0 us-gaap_PaymentsForProceedsFromOtherInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_PaymentsForProceedsFromOtherInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash used in investing activities | 0 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Financing Activities: |  |
Net receipts/(payments) on intercompany activity | 47.4 ati_Netreceiptspaymentsonintercompanyactivity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 58.9 ati_Netreceiptspaymentsonintercompanyactivity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Dividends paid to stockholders | (19.3)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (19.3)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other | (1.5)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (4.0)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash used in financing activities | 26.6 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 35.6 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Decrease in cash and cash equivalents | 0.3 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 5.9 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Subsidiaries |  |
Statement of Cash Flows |  |
Cash flows provided by (used in) operating activities | (42.3)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (125.6)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Investing Activities: |  |
Purchases of property, plant and equipment | (9.1)us-gaap_PaymentsToAcquireProductiveAssets / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (26.3)us-gaap_PaymentsToAcquireProductiveAssets / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Purchases of businesses, net of cash acquired |  | 0 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Net receipts/(payments) on intercompany activity | 0 ati_ProceedsPaymentsfromIntercompanyActivitesInvestingActivities / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 0 ati_ProceedsPaymentsfromIntercompanyActivitesInvestingActivities / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Asset disposals and other | 0.1 us-gaap_PaymentsForProceedsFromOtherInvestingActivities / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 1.4 us-gaap_PaymentsForProceedsFromOtherInvestingActivities / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Cash used in investing activities | (9.0)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (24.9)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Financing Activities: |  |
Net receipts/(payments) on intercompany activity | 49.5 ati_Netreceiptspaymentsonintercompanyactivity / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 150.0 ati_Netreceiptspaymentsonintercompanyactivity / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Dividends paid to stockholders | 0 us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 0 us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Other | 0 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 0 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Cash used in financing activities | 49.5 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 150.0 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Decrease in cash and cash equivalents | (1.8)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (0.5)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
NonGuarantor Subsidiaries |  |
Statement of Cash Flows |  |
Cash flows provided by (used in) operating activities | 80.6 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 98.4 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Investing Activities: |  |
Purchases of property, plant and equipment | (13.5)us-gaap_PaymentsToAcquireProductiveAssets / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (13.3)us-gaap_PaymentsToAcquireProductiveAssets / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Purchases of businesses, net of cash acquired |  | (71.1)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Net receipts/(payments) on intercompany activity | (96.9)ati_ProceedsPaymentsfromIntercompanyActivitesInvestingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (208.9)ati_ProceedsPaymentsfromIntercompanyActivitesInvestingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Asset disposals and other | 0 us-gaap_PaymentsForProceedsFromOtherInvestingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0.4 us-gaap_PaymentsForProceedsFromOtherInvestingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Cash used in investing activities | (110.4)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (292.9)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Financing Activities: |  |
Net receipts/(payments) on intercompany activity | 0 ati_Netreceiptspaymentsonintercompanyactivity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 ati_Netreceiptspaymentsonintercompanyactivity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Dividends paid to stockholders | 0 us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Other | (0.2)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Cash used in financing activities | (0.2)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Decrease in cash and cash equivalents | (30.0)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (194.5)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Consolidation Eliminations |  |
Statement of Cash Flows |  |
Cash flows provided by (used in) operating activities | 0 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Investing Activities: |  |
Purchases of property, plant and equipment | 0 us-gaap_PaymentsToAcquireProductiveAssets / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_PaymentsToAcquireProductiveAssets / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Purchases of businesses, net of cash acquired |  | 0 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Net receipts/(payments) on intercompany activity | 96.9 ati_ProceedsPaymentsfromIntercompanyActivitesInvestingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 208.9 ati_ProceedsPaymentsfromIntercompanyActivitesInvestingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Asset disposals and other | 0 us-gaap_PaymentsForProceedsFromOtherInvestingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_PaymentsForProceedsFromOtherInvestingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Cash used in investing activities | 96.9 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 208.9 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Financing Activities: |  |
Net receipts/(payments) on intercompany activity | (96.9)ati_Netreceiptspaymentsonintercompanyactivity / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (208.9)ati_Netreceiptspaymentsonintercompanyactivity / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Dividends paid to stockholders | 0 us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Other | 0 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Cash used in financing activities | (96.9)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (208.9)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Decrease in cash and cash equivalents | $ 0 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | $ 0 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember

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- Definition Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49171198&loc=d3e33268-110906 + Details
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- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3574-108585 + Details
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- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3574-108585 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3521-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3536-108585 + Details
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- Definition The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3095-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3098-108585 + Details
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- Definition The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 + Details
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