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Business Segments (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
Segment Reporting Information [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
External Sales [Member]
Segment Reporting Information [Line Items]
Sales									4,223.4us-gaap_SalesRevenueGoodsNet / us-gaap_MajorCustomersAxis = ati_ExternalCustomersMember	4,043.5us-gaap_SalesRevenueGoodsNet / us-gaap_MajorCustomersAxis = ati_ExternalCustomersMember	4,666.9us-gaap_SalesRevenueGoodsNet / us-gaap_MajorCustomersAxis = ati_ExternalCustomersMember
Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales									4,404.8us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember	4,163.3us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember	4,797.0us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Operating Segments [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Sales									181.4us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_MajorCustomersAxis = ati_InternalCustomersMember	119.8us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_MajorCustomersAxis = ati_InternalCustomersMember	130.1us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_MajorCustomersAxis = ati_InternalCustomersMember
Operating Segments [Member] | External Sales [Member]
Segment Reporting Information [Line Items]
Sales									4,223.4us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_MajorCustomersAxis = ati_ExternalCustomersMember	4,043.5us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_MajorCustomersAxis = ati_ExternalCustomersMember	4,666.9us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_MajorCustomersAxis = ati_ExternalCustomersMember
Operating Segments [Member] | High Performance Materials & Components [Member]
Segment Reporting Information [Line Items]
Sales									2,084.6us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = ati_HighPerformanceMaterialsComponentsMember	2,016.7us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = ati_HighPerformanceMaterialsComponentsMember	2,398.1us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = ati_HighPerformanceMaterialsComponentsMember
Operating Segments [Member] | High Performance Materials & Components [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Sales									77.8us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_MajorCustomersAxis = ati_InternalCustomersMember / us-gaap_StatementBusinessSegmentsAxis = ati_HighPerformanceMaterialsComponentsMember	71.9us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_MajorCustomersAxis = ati_InternalCustomersMember / us-gaap_StatementBusinessSegmentsAxis = ati_HighPerformanceMaterialsComponentsMember	84.1us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_MajorCustomersAxis = ati_InternalCustomersMember / us-gaap_StatementBusinessSegmentsAxis = ati_HighPerformanceMaterialsComponentsMember
Operating Segments [Member] | High Performance Materials & Components [Member] | External Sales [Member]
Segment Reporting Information [Line Items]
Sales									2,006.8us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_MajorCustomersAxis = ati_ExternalCustomersMember / us-gaap_StatementBusinessSegmentsAxis = ati_HighPerformanceMaterialsComponentsMember	1,944.8us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_MajorCustomersAxis = ati_ExternalCustomersMember / us-gaap_StatementBusinessSegmentsAxis = ati_HighPerformanceMaterialsComponentsMember	2,314.0us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_MajorCustomersAxis = ati_ExternalCustomersMember / us-gaap_StatementBusinessSegmentsAxis = ati_HighPerformanceMaterialsComponentsMember
Operating Segments [Member] | Flat Rolled Products [Member]
Segment Reporting Information [Line Items]
Sales									2,320.2us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = ati_FlatRolledProductsMember	2,146.6us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = ati_FlatRolledProductsMember	2,398.9us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = ati_FlatRolledProductsMember
Operating Segments [Member] | Flat Rolled Products [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Sales									103.6us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_MajorCustomersAxis = ati_InternalCustomersMember / us-gaap_StatementBusinessSegmentsAxis = ati_FlatRolledProductsMember	47.9us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_MajorCustomersAxis = ati_InternalCustomersMember / us-gaap_StatementBusinessSegmentsAxis = ati_FlatRolledProductsMember	46.0us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_MajorCustomersAxis = ati_InternalCustomersMember / us-gaap_StatementBusinessSegmentsAxis = ati_FlatRolledProductsMember
Operating Segments [Member] | Flat Rolled Products [Member] | External Sales [Member]
Segment Reporting Information [Line Items]
Sales									$ 2,216.6us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_MajorCustomersAxis = ati_ExternalCustomersMember / us-gaap_StatementBusinessSegmentsAxis = ati_FlatRolledProductsMember	$ 2,098.7us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_MajorCustomersAxis = ati_ExternalCustomersMember / us-gaap_StatementBusinessSegmentsAxis = ati_FlatRolledProductsMember	$ 2,352.9us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_MajorCustomersAxis = ati_ExternalCustomersMember / us-gaap_StatementBusinessSegmentsAxis = ati_FlatRolledProductsMember

X

- Definition

Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(a))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

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X

- Details

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- Details

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X

- Details

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