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Debt Narrative (Details) | 1 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2017 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) | Feb. 15, 2016 | Dec. 31, 2013
Debt Instrument [Line Items] |  |  |  |  |  |  |
Defined benefit plan contributions made |  | $ 135,000,000 |  |  |  |  |
Allegheny Technologies 5.875% Notes due 2023 (a) |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate |  |  | 7.875% |  | 7.875% | 7.875% | 5.875%
Outstanding borrowings | [1] |  | $ 500,000,000 |  | $ 500,000,000 |  |
Asset-based lending credit facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | 500,000,000 |  |  |  |
Domestic Bank Group $400 million asset-based credit facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Short-term Debt |  |  | 50,000,000 |  | 0 |  |
Amount utilized to support the issuance of letters of credit |  |  | 42,300,000 |  |  |  |
Average borrowings during period |  |  | $ 53,000,000 | $ 4,000,000 |  |  |
Interest rate during period |  |  | 3.50% | 3.43% |  |  |
Domestic Bank Group $400 million asset-based credit facility | Revolving credit facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 400,000,000 |  |  |  |
Minimum fixed charge coverage ratio allowed in event of default |  |  | 1 |  |  |  |
Percentage of borrowing capacity unavailable due to fixed charge coverage ratio covenant |  |  | 10.00% |  |  |  |
Borrowing capacity unavailable due to fixed charge coverage ratio covenant |  |  | $ 40,000,000 |  |  |  |
Minimum required liquidity number of days prior to maturity of Senior Notes |  |  | 91 days |  |  |  |
Domestic Bank Group $400 million asset-based credit facility | Revolving credit facility | Minimum | LIBOR based borrowings |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable interest rate (percentage) |  |  | 1.75% |  |  |  |
Domestic Bank Group $400 million asset-based credit facility | Revolving credit facility | Minimum | Base rate borrowings |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable interest rate (percentage) |  |  | 1.00% |  |  |  |
Domestic Bank Group $400 million asset-based credit facility | Revolving credit facility | Maximum | LIBOR based borrowings |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable interest rate (percentage) |  |  | 2.25% |  |  |  |
Domestic Bank Group $400 million asset-based credit facility | Revolving credit facility | Maximum | Base rate borrowings |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable interest rate (percentage) |  |  | 1.50% |  |  |  |
Domestic Bank Group $400 million asset-based credit facility | Letter of credit sub-facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 200,000,000 |  |  |  |
2022 Term Loan [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Minimum prepayment increments allowed |  |  | 50,000,000 |  |  |  |
Outstanding borrowings |  |  | $ 100,000,000 |  | $ 100,000,000 |  |
2022 Term Loan [Member] | LIBOR based borrowings |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable interest rate (percentage) |  |  | 3.00% |  |  |  |
Allegheny Technologies, Convertible Senior Notes, 4.75%, Due 2022 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate |  |  | 4.75% |  | 4.75% |  |
Outstanding borrowings |  |  | $ 287,500,000 |  | $ 287,500,000 |  |
Allegheny Technologies 5.95% Notes due 2021 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate |  |  | 5.95% |  | 5.95% |  |
Outstanding borrowings |  |  | $ 500,000,000 |  | $ 500,000,000 |  |
Allegheny Technologies 5.95% Notes due 2021 | Revolving credit facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Minimum required liquidity prior to maturity of Senior Notes |  |  | $ 700,000,000 |  |  |  |
[1] | Bearing interest at 7.875% effective February 15, 2016.

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + 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 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 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 + Details
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