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Inventories (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Inventory Disclosure [Abstract] |  |  |
Raw materials and supplies | $ 234.5 us-gaap_InventoryRawMaterialsAndSupplies |  | $ 249.3 us-gaap_InventoryRawMaterialsAndSupplies
Work-in-process | 1,186.3 us-gaap_InventoryWorkInProcess |  | 1,184.1 us-gaap_InventoryWorkInProcess
Finished goods | 177.0 us-gaap_InventoryFinishedGoods |  | 172.2 us-gaap_InventoryFinishedGoods
Total inventories at current cost | 1,597.8 us-gaap_InventoryGross |  | 1,605.6 us-gaap_InventoryGross
Adjustment from current cost to LIFO cost basis | 4.3 us-gaap_InventoryLIFOReserve |  | 4.8 us-gaap_InventoryLIFOReserve
Inventory valuation reserves | (66.4)us-gaap_InventoryValuationReserves |  | (68.8)us-gaap_InventoryValuationReserves
Progress payments | (63.1)us-gaap_ProgressPaymentsNettedAgainstInventoryForLongTermContractsOrPrograms |  | (68.8)us-gaap_ProgressPaymentsNettedAgainstInventoryForLongTermContractsOrPrograms
Total inventories, net | 1,472.6 us-gaap_InventoryNet |  | 1,472.8 us-gaap_InventoryNet
Inventory [Line Items] |  |  |
Lifo Provision (Benefit) | 0.5 ati_LifoProvisionBenefit | 9.0 ati_LifoProvisionBenefit |
High Performance Materials & Components |  |  |
Inventory [Line Items] |  |  |
Change in inventory valuation reserve | (0.5)ati_Changeininventoryvaluationreserve / us-gaap_StatementBusinessSegmentsAxis = ati_HighPerformanceMaterialsComponentsMember | (9.0)ati_Changeininventoryvaluationreserve / us-gaap_StatementBusinessSegmentsAxis = ati_HighPerformanceMaterialsComponentsMember |
Flat Rolled Products |  |  |
Inventory [Line Items] |  |  |
Change in inventory valuation reserve | $ 5.3 ati_Changeininventoryvaluationreserve / us-gaap_StatementBusinessSegmentsAxis = ati_FlatRolledProductsMember | $ 8.3 ati_Changeininventoryvaluationreserve / us-gaap_StatementBusinessSegmentsAxis = ati_FlatRolledProductsMember |

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- Definition Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Gross amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)(4),(5)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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