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Business Segments - Additional Information (Details)	3 Months Ended			6 Months Ended
	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) segment	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Restructuring Cost and Reserve [Line Items]
Number of business segments | segment				2
Government sponsored COVID relief income	$ 5,600,000			$ 34,300,000
Gain (Loss) on sale of business	(115,900,000)		$ 0	(134,200,000)	$ 0
Litigation Reserve	0		0	8,600,000	0
Restructuring charges (credits)	(1,300,000)		(6,200,000)	(2,400,000)	(6,200,000)
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)			(6,900,000)		(6,900,000)
Facility idling
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)			$ 700,000		$ 700,000
ATI Inc. 3.5% Convertible Senior Notes due 2025 | Convertible Debt
Restructuring Cost and Reserve [Line Items]
Debt, Gross	291,400,000			291,400,000		$ 291,400,000
Sheffield, UK Operations
Restructuring Cost and Reserve [Line Items]
Gain (Loss) on sale of business	(115,900,000)	$ (25,100,000)		(141,000,000)
Pico Rivera, CA Operations
Restructuring Cost and Reserve [Line Items]
Gain (Loss) on sale of assets				6,800,000
High Performance Materials & Components
Restructuring Cost and Reserve [Line Items]
Employee retention credits and Aviation Manufacturing Jobs Protection Program	$ 5,600,000			27,500,000
Advanced Alloys & Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Employee retention credits				$ 6,800,000

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Income From Government Assistance, CARES Act

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