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Inventories (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Raw Materials And Supplies	$ 249.3us-gaap_InventoryRawMaterialsAndSupplies	$ 277.6us-gaap_InventoryRawMaterialsAndSupplies
Work In Process	1,184.1us-gaap_InventoryWorkInProcess	984.9us-gaap_InventoryWorkInProcess
Finished Goods	172.2us-gaap_InventoryFinishedGoods	162.1us-gaap_InventoryFinishedGoods
Total inventories at current cost	1,605.6us-gaap_InventoryGross	1,424.6us-gaap_InventoryGross
Adjustment from current cost to LIFO cost basis	(4.8)us-gaap_InventoryLIFOReserve	(29.4)us-gaap_InventoryLIFOReserve
Inventory valuation reserves	68.8us-gaap_InventoryValuationReserves	84.3us-gaap_InventoryValuationReserves
Progress payments	(68.8)us-gaap_ProgressPaymentsNettedAgainstInventoryForLongTermContractsOrPrograms	(47.6)us-gaap_ProgressPaymentsNettedAgainstInventoryForLongTermContractsOrPrograms
Total inventories, net	1,472.8us-gaap_InventoryNet	1,322.1us-gaap_InventoryNet
LIFO Inventory Amount	1,102.4us-gaap_LIFOInventoryAmount	976.1us-gaap_LIFOInventoryAmount
LIFO provision (benefit)	24.6ati_LifoProvisionBenefit	(80.9)ati_LifoProvisionBenefit	(75.6)ati_LifoProvisionBenefit
Inventory valuation reserve		55.5ati_InventoryValuationReservePeriodCharge
Effect of LIFO liquidation on income	0us-gaap_EffectOfLIFOInventoryLiquidationOnIncome	(3.8)us-gaap_EffectOfLIFOInventoryLiquidationOnIncome	(1.5)us-gaap_EffectOfLIFOInventoryLiquidationOnIncome
High Performance Materials & Components [Member]
Segment Reporting Information [Line Items]
Inventory valuation reserves	10.0us-gaap_InventoryValuationReserves / us-gaap_StatementBusinessSegmentsAxis = ati_HighPerformanceMaterialsComponentsMember	35.0us-gaap_InventoryValuationReserves / us-gaap_StatementBusinessSegmentsAxis = ati_HighPerformanceMaterialsComponentsMember
Flat Rolled Products [Member]
Segment Reporting Information [Line Items]
Inventory valuation reserve	$ 23.2ati_InventoryValuationReservePeriodCharge / us-gaap_StatementBusinessSegmentsAxis = ati_FlatRolledProductsMember	$ 20.5ati_InventoryValuationReservePeriodCharge / us-gaap_StatementBusinessSegmentsAxis = ati_FlatRolledProductsMember

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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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Amount of difference between inventory at lower of LIFO cost or market and inventory at lower of other inventory accounting method cost or market, for example, but not limited to, FIFO or average cost.

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Gross amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed.

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Amount of advances received from customers under long-term contracts which have been offset against inventories accounts at the balance sheet date.

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