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Debt - Narrative (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) tradingDays $ / shares	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2024 USD ($)	Jan. 01, 2021 USD ($)	Jul. 02, 2020 USD ($)	Feb. 15, 2016	Dec. 31, 2013
Interest Costs Incurred [Abstract]
Interest expense	$ 97,600,000	$ 96,100,000	$ 104,900,000
Interest costs capitalized	4,300,000	7,700,000	4,700,000
Interest costs paid	97,500,000	95,400,000	105,700,000
Interest income	700,000	1,700,000	5,900,000
Long-term Debt, Fiscal Year Maturity [Abstract]
2022	131,600,000
2023	19,600,000
2024	217,100,000
2025	454,700,000
2026	7,500,000
Debt Instrument [Line Items]
Payments of debt issuance costs	9,500,000	9,100,000	5,500,000
Debt extinguishment charge	65,500,000	21,500,000	21,600,000
Payment for Debt Extinguishment or Debt Prepayment Cost	64,500,000	19,100,000	20,900,000
Debt Issuance Costs, Net	20,800,000	14,500,000
Purchase of convertible note capped call	0	(19,400,000)	0
Equity component of convertible note		49,800,000
Total stockholders’ equity	832,700,000	641,400,000	2,193,200,000	$ 1,991,600,000
Interest expense, net	96,900,000	94,400,000	99,000,000.0
Fair Value Measurements at Reporting Date Using Total Estimated Fair Value
Debt Instrument [Line Items]
Debt	2,003,200,000	1,847,700,000
Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets (Level 1)
Debt Instrument [Line Items]
Debt	1,690,100,000	1,594,200,000
Accounting Standards Update 2020-06
Debt Instrument [Line Items]
Total stockholders’ equity						$ (45,400,000)
Additional Paid-In Capital
Debt Instrument [Line Items]
Equity component of convertible note		49,800,000
Total stockholders’ equity	1,596,700,000	$ 1,625,500,000	1,618,000,000	$ 1,615,400,000
Delayed-Draw Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument carrying amount	100,000,000
Allegheny Technologies $500 million 5.875% Senior Notes due 2023 [Member]
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage								7.875%	5.875%
Increase in interest expense per downgrade notch, percent		0.25%
Maximum number of downgrade notches		4
Maximum increase in interest rate expense, percent		2.00%
Debt instrument carrying amount	0	$ 500,000,000
Write off of Deferred Debt Issuance Cost	1,000,000
Allegheny Technologies $500 million 5.875% Senior Notes due 2023 [Member] | Maximum
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage		7.875%
Domestic Bank Group $500 million asset-based credit facility [Member]
Debt Instrument [Line Items]
Debt instrument carrying amount	0	$ 0
Line of credit facility amount outstanding	48,300,000
Average outstanding amount	$ 0	$ 28,000,000
Interest rate during period		2.20%
Term Loan due 2024
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	4.21%
Debt instrument carrying amount	$ 200,000,000	$ 200,000,000.0
Debt Instrument, Prepayment Increments, Minimum	$ 25,000,000
Term Loan due 2024 | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Variable rate spread	2.00%
Allegheny Technologies $500 million 5.95% Senior Notes due 2021 [Member]
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage				5.95%
Debt instrument carrying amount				$ 500,000,000
Write off of Deferred Debt Issuance Cost			$ 700,000
Allegheny Technologies, Convertible Senior Notes, 4.75%, Due 2022 [Member]
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	4.75%	4.75%
Debt instrument carrying amount	$ 84,200,000	$ 84,200,000
Allegheny Technologies, Convertible Senior Notes, 4.75%, Due 2022 [Member] | Convertible Debt [Member]
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	4.75%
Convertible debt conversion rate in shares of stock	0.0692042
Number of equity instruments issuable	5,800,000
Conversion price of convertible notes | $ / shares	$ 14.45
Write off of Deferred Debt Issuance Cost		2,400,000
Debt Instrument, Repurchased Face Amount		203,200,000
Debt Instrument, Convertible, Redemption Price As A Percent Of Principal Amount	100.00%
Debt Issuance Costs, Net	$ 300,000	$ 700,000
Debt Instrument, Interest Rate, Effective Percentage	5.40%	5.40%	5.40%
Interest Expense, Debt, Excluding Amortization	$ 4,000,000.0	$ 8,600,000	$ 13,700,000
Amortization of Debt Issuance Costs	500,000	1,000,000.0	1,500,000
Interest expense, net	4,500,000	$ 9,600,000	15,200,000
Allegheny Technologies, Convertible Senior Notes, 4.75%, Due 2022 [Member] | Convertible Debt [Member] | Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measurements at Reporting Date Using Total Estimated Fair Value
Debt Instrument [Line Items]
Debt	$ 102,000,000
Allegheny Technologies $350 million 5.875% Senior Notes due 2027
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	5.875%	5.875%
Proceeds from Issuance of Debt			$ 344,500,000
Debt instrument carrying amount	$ 350,000,000.0	$ 350,000,000.0
Debt instrument, term			8 years
Debt instrument, redemption price, percentage			101.00%
Allegheny Technologies $350 million 5.875% Senior Notes due 2027 | Minimum
Debt Instrument [Line Items]
Debt instrument, notice period required for redemption			30 days
Allegheny Technologies $350 million 5.875% Senior Notes due 2027 | Maximum
Debt Instrument [Line Items]
Debt instrument, notice period required for redemption			60 days
Allegheny Technologies, Convertible Senior Notes, 3.5%, Due 2025 [Member] | Convertible Debt [Member]
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	3.50%	3.50%
Debt instrument carrying amount	$ 291,400,000	$ 291,400,000
Convertible debt conversion rate in shares of stock	0.0645745
Number of equity instruments issuable	18,800,000
Conversion price of convertible notes | $ / shares	$ 15.49
Debt Instrument, Convertible, Redemption Price As A Percent Of Principal Amount	100.00%
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger	130.00%
Debt Instrument, Convertible, Threshold Trading Days | tradingDays	20
Debt Instrument, Convertible, Threshold Consecutive Trading Days | tradingDays	30
Equity component of convertible debt	$ 0	46,800,000					$ 51,400,000
Debt Issuance Costs, Net	$ 6,500,000	$ 8,200,000
Debt Instrument, Interest Rate, Effective Percentage	4.20%	8.40%
Debt Instrument, Convertible, Cap Price | $ / shares	$ 19.76
Interest Expense, Debt, Excluding Amortization	$ 10,200,000	$ 5,300,000
Amortization of Debt Issuance Costs	1,700,000	700,000
Interest expense, net	11,900,000	6,000,000.0
Allegheny Technologies, Convertible Senior Notes, 3.5%, Due 2025 [Member] | Convertible Debt [Member] | Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measurements at Reporting Date Using Total Estimated Fair Value
Debt Instrument [Line Items]
Debt	$ 379,000,000
Allegheny Technologies, Convertible Senior Notes, 3.5%, Due 2025 [Member] | Convertible Debt [Member] | Accounting Standards Update 2020-06
Debt Instrument [Line Items]
Long-term debt						$ 45,400,000
Allegheny Technologies, Convertible Senior Notes, 3.5%, Due 2025 [Member] | Convertible Debt [Member] | Additional Paid in Capital
Debt Instrument [Line Items]
Debt Issuance Costs, Net		1,600,000
ATI 2029 and 2031 Notes
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage	101.00%
Proceeds from Debt, Net of Issuance Costs	$ 665,700,000
ATI 2029 and 2031 Notes | Minimum
Debt Instrument [Line Items]
Debt instrument, notice period required for redemption	15 days
ATI 2029 and 2031 Notes | Maximum
Debt Instrument [Line Items]
Debt instrument, notice period required for redemption	60 days
ATI 2029 Notes
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	4.875%
Payments of debt issuance costs	$ 4,700,000
Debt instrument carrying amount	$ 325,000,000	0
Debt instrument, term	8 years
ATI 2031Notes
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	5.125%
Payments of debt issuance costs	$ 4,700,000
Debt instrument carrying amount	$ 350,000,000.0	$ 0
Debt instrument, term	10 years
Revolving Credit Facility [Member] | Domestic Bank Group $500 million asset-based credit facility [Member]
Debt Instrument [Line Items]
Line of credit maximum borrowing capacity	$ 500,000,000
Payments of debt issuance costs			$ 2,200,000	$ 2,100,000
Fixed charge coverage ratio	1.00
Remaining borrowing capacity, percent of minimum borrowing capacity	12.50%
Minimum remaining borrowing capacity	$ 62,500,000
Debt Instrument, Covenant, Fixed Coverage Ratio Restriction, Maximum Borrowing Capacity	87,500,000
Debt Covenant, Undrawn Availability Requirement, Amount	$ 150,000,000
Debt Covenant, Undrawn Availability Requirement, Percent Of Total Available Liquidity	30.00%
Revolving Credit Facility [Member] | Domestic Bank Group $500 million asset-based credit facility [Member] | Minimum | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Variable rate spread	1.25%
Revolving Credit Facility [Member] | Domestic Bank Group $500 million asset-based credit facility [Member] | Minimum | Base Rate [Member]
Debt Instrument [Line Items]
Variable rate spread	0.25%
Revolving Credit Facility [Member] | Domestic Bank Group $500 million asset-based credit facility [Member] | Maximum | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Variable rate spread	1.75%
Revolving Credit Facility [Member] | Domestic Bank Group $500 million asset-based credit facility [Member] | Maximum | Base Rate [Member]
Debt Instrument [Line Items]
Variable rate spread	0.75%
Letter of Credit [Member] | Domestic Bank Group $500 million asset-based credit facility [Member]
Debt Instrument [Line Items]
Line of credit maximum borrowing capacity	$ 200,000,000
Foreign Line of Credit
Debt Instrument [Line Items]
Line of credit maximum borrowing capacity	65,000,000
Interest Rate Swap [Member] | Term Loan due 2024
Debt Instrument [Line Items]
Derivative notional amount	$ 50,000,000
Forecast | Revolving Credit Facility [Member] | Domestic Bank Group $500 million asset-based credit facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Increase to Maximum Borrowing Capacity					$ 200,000,000

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