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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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-Paragraph 4I
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481175/810-10-55-4I

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