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v3.21.2

Debt Schedule of Debt (Details) - USD ($) | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020 | Jul. 02, 2020 | Feb. 15, 2016 | Dec. 31, 2013
Debt Instrument [Line Items] |  |  |  |  |
Debt Issuance Costs, Net | $ (14,200,000) | $ (14,500,000) |  |  |
Total Debt | 1,621,500,000 | 1,567,800,000 |  |  |
Short-term debt and current portion of long-term debt | 19,300,000 | 17,800,000 |  |  |
Long-term debt | 1,602,200,000 | 1,550,000,000.0 |  |  |
Allegheny Technologies 5.875% Notes due 2023 (a) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, Gross | $ 500,000,000.0 | $ 500,000,000.0 |  |  |
Debt Instrument, Issuer | Allegheny Technologies | Allegheny Technologies |  |  |
Interest rate | 7.875% | 7.875% |  | 7.875% | 5.875%
Debt Instrument, Maturity Date | Aug. 15, 2023 | Aug. 15, 2023 |  |  |
Allegheny Technologies 5.875% Notes due 2027 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, Gross | $ 350,000,000.0 | $ 350,000,000.0 |  |  |
Debt Instrument, Issuer | Allegheny Technologies | Allegheny Technologies |  |  |
Interest rate | 5.875% | 5.875% |  |  |
Debt Instrument, Maturity Date | Dec. 01, 2027 | Dec. 01, 2027 |  |  |
Allegheny Technologies 3.5% Convertible Senior Notes due 2025 | Convertible Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, Gross | $ 291,400,000 | $ 291,400,000 |  |  |
Debt Issuance Costs, Net | (7,400,000) | (8,200,000) |  |  |
Equity component of convertible debt | $ 0 | $ (46,800,000) | $ (51,400,000) |  |
Debt Instrument, Issuer | Allegheny Technologies | Allegheny Technologies |  |  |
Interest rate | 3.50% | 3.50% |  |  |
Debt Instrument, Maturity Date | Jun. 15, 2025 | Jun. 15, 2025 |  |  |
Allegheny Technologies 4.75% Convertible Senior Notes due 2022 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, Gross | $ 84,200,000 | $ 84,200,000 |  |  |
Debt Instrument, Issuer | Allegheny Technologies | Allegheny Technologies |  |  |
Interest rate | 4.75% | 4.75% |  |  |
Debt Instrument, Maturity Date | Jul. 01, 2022 | Jul. 01, 2022 |  |  |
Allegheny Technologies 4.75% Convertible Senior Notes due 2022 | Convertible Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Issuance Costs, Net | $ (500,000) | $ (700,000) |  |  |
Allegheny Ludlum 6.95% Debentures due 2025 (b) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, Gross | $ 150,000,000.0 | $ 150,000,000.0 |  |  |
Debt Instrument, Issuer | Allegheny Ludlum | Allegheny Ludlum |  |  |
Interest rate | 6.95% | 6.95% |  |  |
Debt Instrument, Maturity Date | Dec. 15, 2025 | Dec. 15, 2025 |  |  |
2024 Term Loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, Gross | $ 200,000,000 | $ 200,000,000.0 |  |  |
Debt Instrument, Issuer | Allegheny Technologies | Allegheny Technologies |  |  |
Interest rate | 4.21% |  |  |  |
Debt Instrument, Maturity Date | Sep. 30, 2024 | Sep. 30, 2024 |  |  |
Domestic Bank Group $500 million asset-based credit facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Short-term Debt | $ 0 | $ 0 |  |  |
Foreign credit facilities |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Short-term Debt | 4,600,000 | 5,500,000 |  |  |
Finance leases and other |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, Gross | $ 55,500,000 | $ 48,000,000.0 |  |  |

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