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Accounting Policies (Accounting Pronouncements) (Details) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2023 USD ($) segment | Jun. 30, 2022 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Revenue recognition [Line Items] |  |  |  |  |  |  |  |
Number of business segments | segment |  |  | 2 |  |  |  |  |
Impact of new accounting principle on prior period operating income | $ 120.3 | $ (11.6) | $ 232.9 | $ 65.4 |  |  |  |
Unfavorable impact on pre-tax operating results | (82.8) | 30.9 | (159.3) | (9.2) |  |  |  |
Equity adjustment for adoption | 1,309.2 | 893.9 | 1,309.2 | 893.9 | $ 1,214.3 | $ 1,157.2 | $ 795.7 | $ 832.7
Additional Paid-in Capital [Member] |  |  |  |  |  |  |  |
Revenue recognition [Line Items] |  |  |  |  |  |  |  |
Equity adjustment for adoption | 1,682.0 | 1,656.6 | 1,682.0 | 1,656.6 | 1,675.1 | 1,668.1 | 1,602.5 | 1,596.7
[RetainedEarningsMember] |  |  |  |  |  |  |  |
Revenue recognition [Line Items] |  |  |  |  |  |  |  |
Equity adjustment for adoption | $ 323.0 | $ 38.9 | $ 323.0 | $ 38.9 | $ 247.0 | $ 176.9 | $ 103.6 | $ 72.7
ATI Inc. 3.5% Convertible Senior Notes due 2025 | Convertible Debt |  |  |  |  |  |  |  |
Revenue recognition [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.50% |  | 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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