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Supplemental Financial Statement Information - Allowance for Doubtful Accounts (Details) (Allowance for Doubtful Accounts [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Reserve for doubtful accounts	$ 4.8us-gaap_ValuationAllowancesAndReservesBalance	$ 5.3us-gaap_ValuationAllowancesAndReservesBalance
Reserve for doubtful accounts, increase	0.5us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense	1.1us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense	1.0us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
Reserve for doubtful accounts, decrease	1.0us-gaap_ValuationAllowancesAndReservesDeductions	0.8us-gaap_ValuationAllowancesAndReservesDeductions	1.4us-gaap_ValuationAllowancesAndReservesDeductions
Tungsten Materials Business [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Reserve for doubtful accounts, decrease		$ 0.5us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_StatementBusinessSegmentsAxis = ati_TungstenMaterialsBusinessMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember

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- Definition

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 09

-Article 12

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- Definition

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to costs and expenses.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 09

-Article 12

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- Definition

Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 09

-Article 12

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