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v3.23.1

Debt Schedule of Debt (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022
Debt Instrument [Line Items] |  |
Debt Issuance Costs, Net | $ (16,300,000) | $ (17,200,000)
Debt | 1,727,000,000 | 1,748,000,000
Short-term debt and current portion of long-term debt | 24,900,000 | 41,700,000
Long-term debt | 1,702,100,000 | 1,706,300,000
ATI Inc. 5.875% Notes due 2027 |  |
Debt Instrument [Line Items] |  |
Debt, Gross | $ 350,000,000.0 | $ 350,000,000.0
Debt Instrument, Issuer | ATI Inc. | ATI Inc.
Interest rate | 5.875% | 5.875%
Debt Instrument, Maturity Date | Dec. 01, 2027 | Dec. 01, 2027
ATI Inc. 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 | $ (4,300,000) | $ (4,800,000)
Debt Instrument, Issuer | ATI Inc. | ATI Inc.
Interest rate | 3.50% | 3.50%
Debt Instrument, Maturity Date | Jun. 15, 2025 | Jun. 15, 2025
Allegheny Ludlum 6.95% Debentures due 2025 (a) |  |
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
Foreign credit facilities |  |
Debt Instrument [Line Items] |  |
Short-term Debt | $ 2,900,000 | $ 19,400,000
Finance leases and other |  |
Debt Instrument [Line Items] |  |
Debt, Gross | 74,000,000.0 | 79,400,000
ATI 2031 Notes |  |
Debt Instrument [Line Items] |  |
Debt, Gross | $ 350,000,000.0 | $ 350,000,000.0
Debt Instrument, Issuer | ATI Inc. | ATI Inc.
Interest rate | 5.125% | 5.125%
Debt Instrument, Maturity Date | Oct. 01, 2031 | Oct. 01, 2031
ATI 2029 Notes |  |
Debt Instrument [Line Items] |  |
Debt, Gross | $ 325,000,000.0 | $ 325,000,000.0
Debt Instrument, Issuer | ATI Inc. | ATI Inc.
Interest rate | 4.875% | 4.875%
Debt Instrument, Maturity Date | Oct. 01, 2029 | Oct. 01, 2029
Domestic Bank Group $600 million asset-based credit facility |  |
Debt Instrument [Line Items] |  |
Short-term Debt | $ 0 | $ 0
2027 Term Loan |  |
Debt Instrument [Line Items] |  |
Debt, Gross | $ 200,000,000.0 | $ 200,000,000.0
Debt Instrument, Issuer | ATI Inc. | ATI Inc.
Interest rate | 4.21% |
Debt Instrument, Maturity Date | Sep. 09, 2027 | Sep. 09, 2027

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