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Debt Narrative (Details) - USD ($) | 3 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Sep. 30, 2024 | Jun. 30, 2020 | Dec. 31, 2019 | Feb. 15, 2016 | Dec. 31, 2013
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] | $ 500,000,000.0 |  |  |  | $ 500,000,000.0 |  |
Domestic Bank Group $500 million asset-based credit facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Short-term Debt |  | 300,000,000.0 |  |  |  | 0 |  |
Amount utilized to support the issuance of letters of credit |  | 35,300,000 |  |  |  |  |  |
Average borrowings during period |  | $ 53,000,000 | $ 0 |  |  |  |  |
Interest rate during period |  | 2.60% |  |  |  |  |  |
Domestic Bank Group $500 million asset-based credit facility | Revolving credit facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 500,000,000 |  |  |  |  |  |
Minimum fixed charge coverage ratio allowed in event of default |  | 1.00 |  |  |  |  |  |
Percentage of borrowing capacity unavailable due to fixed charge coverage ratio covenant |  | 12.50% |  |  |  |  |  |
Borrowing capacity unavailable due to fixed charge coverage ratio covenant |  | $ 62,500,000 |  |  |  |  |  |
Minimum required liquidity number of days prior to maturity of Senior Notes |  | 90 days |  |  |  |  |  |
Domestic Bank Group $500 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 $500 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 $500 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 $500 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 $500 million asset-based credit facility | Letter of credit sub-facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 200,000,000 |  |  |  |  |  |
2024 Term Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate |  | 4.21% |  |  |  |  |  |
Minimum prepayment increments allowed |  | $ 25,000,000 |  |  |  |  |  |
Outstanding borrowings |  | 100,000,000 |  |  |  | $ 100,000,000.0 |  |
2024 Term Loan | Interest Rate Swap |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Notional amount of derivative |  | $ 50,000,000 |  |  |  |  |  |
2024 Term Loan | LIBOR based borrowings |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Variable interest rate (percentage) |  | 2.00% |  |  |  |  |  |
Allegheny Technologies, Convertible Senior Notes, 4.75%, Due 2022 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate |  | 4.75% |  |  |  | 4.75% |  |
Outstanding borrowings |  | $ 287,500,000 |  |  |  | $ 287,500,000 |  |
Forecast | Domestic Bank Group $500 million asset-based credit facility | Revolving credit facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, increase to maximum borrowing capacity |  |  |  | $ 200,000,000 |  |  |  |
Forecast | Delayed-Draw Term Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 100,000,000 |  |  |
[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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=119400593&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 4: http://fasb.org/us-gaap/role/ref/legacyRef -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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