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Accounting Policies (Accounting Pronouncements) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) segment	Sep. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jun. 30, 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	$ 125.2	$ 113.2	$ 358.1	$ 178.6
Unfavorable impact on pre-tax operating results	(84.5)	(67.4)	(243.8)	(76.6)
Equity adjustment for adoption	1,355.9	938.4	1,355.9	938.4	$ 1,309.2	$ 1,157.2	$ 893.9	$ 832.7
Additional Paid-in Capital [Member]
Revenue recognition [Line Items]
Equity adjustment for adoption	1,689.5	1,662.2	1,689.5	1,662.2	1,682.0	1,668.1	1,656.6	1,596.7
[RetainedEarningsMember]
Revenue recognition [Line Items]
Equity adjustment for adoption	$ 398.7	$ 100.0	$ 398.7	$ 100.0	$ 323.0	$ 176.9	$ 38.9	$ 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%			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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-Paragraph 4I
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481175/810-10-55-4I

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