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Debt - Convertible Notes Narrative (Details) $ / shares in Units, shares in Millions | 3 Months Ended | 8 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 29, 2024 USD ($) $ / shares shares | Sep. 10, 2024 USD ($) | Oct. 01, 2023 USD ($) | Sep. 10, 2024 | Sep. 29, 2024 USD ($) $ / shares | Oct. 01, 2023 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($) | Jul. 02, 2023 USD ($) | Jan. 01, 2023 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Equity adjustment for adoption | $ 1,912,000,000 |  | $ 1,355,900,000 |  | $ 1,912,000,000 | $ 1,355,900,000 | $ 1,467,900,000 | $ 1,480,500,000 | $ 1,309,200,000 | $ 1,157,200,000
Debt issuance costs | 14,800,000 |  |  |  | 14,800,000 |  |  | 19,600,000 |  |
Interest expense, net | 28,000,000.0 |  | $ 23,800,000 |  | 83,000,000.0 | 65,000,000.0 |  |  |  |
Stock Issued During Period, Value, Conversion of Convertible Securities | $ 291,000,000.0 |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Conversion of Convertible Securities | shares | 18.8 |  |  |  |  |  |  |  |  |
Repayment of Long-Term Debt, Long-Term Lease Obligation, and Capital Security |  |  |  |  | 21,900,000 | 22,000,000.0 |  |  |  |
Receipt of convertible note capped call | $ 76,100,000 |  |  |  | 76,100,000 | $ 0 |  |  |  |
Estimate Of Fair Value Fair Value Disclosure |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt | 1,911,200,000 |  |  |  | 1,911,200,000 |  |  | 2,746,700,000 |  |
Fair Value Inputs Level 1 | Estimate Of Fair Value Fair Value Disclosure |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt | 1,613,000,000 |  |  |  | 1,613,000,000 |  |  | 2,438,900,000 |  |
ATI Inc. 3.5% Convertible Senior Notes due 2025 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayment of Long-Term Debt, Long-Term Lease Obligation, and Capital Security | 400,000 |  |  |  |  |  |  |  |  |
ATI Inc. 3.5% Convertible Senior Notes due 2025 | Convertible Debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt, Gross | $ 0 |  |  |  | $ 0 |  |  | $ 291,400,000 |  |
Interest rate |  |  |  |  |  |  |  | 3.50% |  |
Debt instrument, convertible, conversion ratio |  |  |  | 0.0645745 |  |  |  |  |  |
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares | $ 15.49 |  |  |  | $ 15.49 |  |  |  |  |
Debt issuance costs |  |  |  |  |  |  |  | $ 2,900,000 |  |
Debt instrument, interest rate, effective percentage | 4.20% |  | 4.20% |  | 4.20% | 4.20% |  |  |  |
Cap price (in dollars per share) | $ / shares | $ 19.76 |  |  |  | $ 19.76 |  |  |  |  |
Interest Expense, Debt, Excluding Amortization | $ 2,100,000 |  | $ 2,500,000 |  | $ 7,200,000 | $ 7,600,000 |  |  |  |
Amortization of Debt Issuance Costs | 300,000 |  | 500,000 |  | 1,300,000 | 1,400,000 |  |  |  |
Interest expense, net | 2,400,000 |  | $ 3,000,000.0 |  | $ 8,500,000 | $ 9,000,000.0 |  |  |  |
Write off of deferred debt issue costs | $ (1,600,000) |  |  |  |  |  |  |  |  |
Debt Instrument, Increase, Accrued Interest |  | $ 2,300,000 |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price with Premium | $ / shares | $ 15.45 |  |  |  | $ 15.45 |  |  |  |  |
Debt Instrument, Convertible, Conversion Ratio, Premium |  |  |  | 0.0647178 |  |  |  |  |  |
ATI Inc. 3.5% Convertible Senior Notes due 2025 | Convertible Debt | Fair Value Inputs Level 1 | Estimate Of Fair Value Fair Value Disclosure |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  | $ 864,000,000 |  |

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