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v3.20.2

Debt Schedule of Debt (Details) - USD ($) | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019 | Feb. 15, 2016 | Dec. 31, 2013
Debt Instrument [Line Items] |  |  |  |  |
Debt Issuance Costs, Net |  | $ (16,100,000) | $ (12,300,000) |  |
Total Debt |  | 1,529,700,000 | 1,398,900,000 |  |
Short-term debt and current portion of long-term debt |  | 12,800,000 | 11,500,000 |  |
Long-term debt |  | 1,516,900,000 | 1,387,400,000 |  |
Allegheny Technologies, Convertible Senior Notes, 4.75%, Due 2022 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, Gross |  | $ 84,200,000 | 287,500,000 |  |
Allegheny Technologies, Convertible Senior Notes, 4.75%, Due 2022 | Convertible Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate |  | 4.75% |  |  |
Allegheny Technologies 5.875% Notes due 2023 (a) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, Gross | [1] | $ 500,000,000.0 | $ 500,000,000.0 |  |
Debt Instrument, Issuer |  | Allegheny Technologies |  |  |
Debt Instrument, Maturity Date |  | Aug. 15, 2023 | Aug. 15, 2023 |  |
Interest rate |  |  |  | 7.875% | 5.875%
ATI 2027 Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, Gross |  | $ 350,000,000.0 | $ 350,000,000.0 |  |
Debt Instrument, Maturity Date |  | Dec. 01, 2027 | Dec. 01, 2027 |  |
Allegheny Ludlum 6.95% debentures due 2025 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, Gross |  | $ 150,000,000.0 | $ 150,000,000.0 |  |
Debt Instrument, Maturity Date |  | Dec. 15, 2025 | Dec. 15, 2025 |  |
2024 Term Loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, Gross |  | $ 200,000,000 | $ 100,000,000.0 |  |
Debt Instrument, Issuer |  | Allegheny Technologies |  |  |
Debt Instrument, Maturity Date |  | Sep. 30, 2024 | Sep. 30, 2024 |  |
Interest rate |  | 4.21% |  |  |
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 |  | 5,600,000 | 4,900,000 |  |
Other |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, Gross |  | 21,300,000 | 18,800,000 |  |
Allegheny Technologies, Convertible Senior Notes, 3.5%, Due 2025 | Convertible Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, Gross |  | 285,000,000.0 | 0 |  |
Equity component of convertible debt |  | $ (50,300,000) | $ 0 |  |
Debt Instrument, Maturity Date |  | Jun. 15, 2025 |  |  |
Interest rate |  | 3.50% |  |  |
[1] | Bearing interest at 7.875% effective February 15, 2016.

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