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Accounting Policies (Accounting Pronouncements) (Details) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 29, 2024 USD ($) | Oct. 01, 2023 USD ($) | Sep. 29, 2024 USD ($) segment | Oct. 01, 2023 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($) | Jul. 02, 2023 USD ($) | Jan. 01, 2023 USD ($)
Revenue recognition [Line Items] |  |  |  |  |  |  |  |
Number of business segments | segment |  |  | 2 |  |  |  |  |
Unfavorable impact on pre-tax operating results | $ (114.9) | $ (99.0) | $ (311.1) | $ (287.1) |  |  |  |
Equity adjustment for adoption | 1,912.0 | 1,355.9 | 1,912.0 | 1,355.9 | $ 1,467.9 | $ 1,480.5 | $ 1,309.2 | $ 1,157.2
Additional Paid-in Capital [Member] |  |  |  |  |  |  |  |
Revenue recognition [Line Items] |  |  |  |  |  |  |  |
Equity adjustment for adoption | 1,937.8 | 1,689.5 | 1,937.8 | 1,689.5 | 1,712.9 | 1,697.1 | 1,682.0 | 1,668.1
[RetainedEarningsMember] |  |  |  |  |  |  |  |
Revenue recognition [Line Items] |  |  |  |  |  |  |  |
Equity adjustment for adoption | $ (72.8) | $ (215.8) | $ (72.8) | $ (215.8) | $ 78.4 | $ (70.1) | $ (306.0) | $ (480.9)
ATI Inc. 3.5% Convertible Senior Notes due 2025 | Convertible Debt |  |  |  |  |  |  |  |
Revenue recognition [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 3.50% |  |
Allegheny & Tsingshan Stainless |  |  |  |  |  |  |  |
Revenue recognition [Line Items] |  |  |  |  |  |  |  |
Equity method investment ownership percentage | 50.00% |  | 50.00% |  |  |  |  |
Uniti |  |  |  |  |  |  |  |
Revenue recognition [Line Items] |  |  |  |  |  |  |  |
Equity method investment ownership percentage | 50.00% |  | 50.00% |  |  |  |  |

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