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Debt Narrative (Details) |  |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 23, 2015 USD ($) | Sep. 23, 2015 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2015 USD ($) | Feb. 15, 2015 | Dec. 31, 2014 USD ($) | Dec. 31, 2013
STAL Precision Stainless Steel Company Limited |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Ownership interest (percentage) |  |  |  | 60.00% | 60.00% |  |  |
ATI Ladish Series B 6.14% Notes due 2016 (b) |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 6.14% |
Repayment of debt during period |  |  |  | $ 5,700,000 |  |  |  |
ATI Ladish Series C 6.41% Notes due 2015 (c) |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 6.41% |
Repayment of debt during period |  |  |  | $ 10,000,000 |  |  |  |
Allegheny Technologies 5.875% Notes due 2023 (a) |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate |  |  |  | 6.625% | 6.625% | 6.625% | 6.125% | 5.875%
Outstanding borrowings | [1] |  |  | $ 500,000,000 | $ 500,000,000 |  | $ 500,000,000 |
Domestic Bank Group $400 million asset-based credit facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Outstanding borrowings |  |  |  | 0 | 0 |  |  |
Amount utilized to support the issuance of letters of credit |  |  |  | 4,600,000 | 4,600,000 |  |  |
Domestic Bank Group $400 million asset-based credit facility | Revolving credit facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 400,000,000 |  |  |  |  |
Debt issuance costs |  |  | $ 1,300,000 |  |  |  |  |
Term of facility (in years) |  |  | 5 years |  |  |  |  |
Minimum fixed charge coverage ratio allowed in event of default |  |  | 1 |  |  |  |  |
Minimum remaining borrowing capacity as a percent of maximum borrowing capacity |  |  | 10.00% |  |  |  |  |
Minimum remaining borrowing capacity |  |  | $ 40,000,000 |  |  |  |  |
Minimum required liquidity prior to maturity of 9.375% Senior Notes due 2019 |  |  | $ 500,000,000 |  |  |  |  |
Minimum required liquidity number of days prior to maturity of 9.375% Senior Notes due 2019 |  |  | 91 days |  |  |  |  |
Outstanding borrowings |  |  |  | 0 | 0 |  |  |
Domestic Bank Group $400 million asset-based credit facility | Revolving credit facility | Minimum | LIBOR based borrowings |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Variable interest rate (percentage) |  |  | 1.25% |  |  |  |  |
Domestic Bank Group $400 million asset-based credit facility | Revolving credit facility | Minimum | Base rate borrowings |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Variable interest rate (percentage) |  |  | 0.25% |  |  |  |  |
Domestic Bank Group $400 million asset-based credit facility | Revolving credit facility | Maximum | LIBOR based borrowings |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Variable interest rate (percentage) |  |  | 1.75% |  |  |  |  |
Domestic Bank Group $400 million asset-based credit facility | Revolving credit facility | Maximum | Base rate borrowings |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Variable interest rate (percentage) |  |  | 0.75% |  |  |  |  |
Domestic Bank Group $400 million asset-based credit facility | Letter of credit sub-facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 200,000,000 |  |  |  |  |
Domestic Bank Group $400 million credit facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Outstanding borrowings |  |  |  |  |  |  | 0 |
Average borrowings during period |  |  |  |  | $ 49,200,000 |  |  |
Interest rate during period |  |  |  |  | 2.40% |  |  |
Domestic Bank Group $400 million credit facility | Revolving credit facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 400,000,000 |
Seperateletter of Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  | 32,000,000 | $ 32,000,000 |  |  |
STAL Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 20,000,000 | $ 20,000,000 |  |  |
Subsequent Event | Allegheny Technologies 5.875% Notes due 2023 (a) |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate |  | 7.125% |  |  |  |  |  |
Additional annual interest expense to be incurred |  | $ 2,500,000 |  |  |  |  |  |
Increase in interest expense per downgrade notch (percent) |  | 0.25% |  |  |  |  |  |
Maximum number of downgrade notches |  | 4 |  |  |  |  |  |
Maximum potential increase in interest rate expense (percent) |  | 2.00% |  |  |  |  |  |
Increase in stated interest rate due to credit downgrade (percent) |  | 1.25% |  |  |  |  |  |
[1] | Bearing interest at 6.625% effective February 15, 2015.

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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal 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 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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