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Debt - Schedule of Debt (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Jul. 02, 2020 | Feb. 15, 2016 | Dec. 31, 2013
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Issuance Costs, Net |  | $ 20,800,000 | $ 14,500,000 |  |  |  |
Total short-term and long-term debt |  | 1,842,900,000 | 1,567,800,000 |  |  |  |
Short-term debt and current portion of long-term debt |  | 131,300,000 | 17,800,000 |  |  |  |
Total long-term debt |  | 1,711,600,000 | $ 1,550,000,000 |  |  |  |
Allegheny Technologies $500 million 5.875% Senior Notes due 2023 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument issuer | [1] |  | Allegheny Technologies |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  | 7.875% | 5.875%
Debt instrument carrying amount |  | $ 0 | $ 500,000,000 |  |  |  |
Allegheny Technologies $350 million 5.875% Senior Notes due 2027 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument issuer |  | Allegheny Technologies | Allegheny Technologies |  |  |  |
Debt instrument interest rate stated percentage |  | 5.875% | 5.875% |  |  |  |
Debt instrument carrying amount |  | $ 350,000,000.0 | $ 350,000,000.0 |  |  |  |
Debt Instrument, Maturity Date |  | Dec. 01, 2027 | Dec. 01, 2027 |  |  |  |
Debt instrument, term |  |  |  | 8 years |  |  |
Allegheny Technologies, $287.5 million Convertible Senior Notes, 4.75%, Due 2022 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument issuer |  | Allegheny Technologies | Allegheny Technologies |  |  |  |
Debt instrument interest rate stated percentage |  | 4.75% | 4.75% |  |  |  |
Debt instrument carrying amount |  | $ 84,200,000 | $ 84,200,000 |  |  |  |
Debt Instrument, Maturity Date |  | Jul. 01, 2022 | Jul. 01, 2022 |  |  |  |
Allegheny Ludlum 6.95% Debentures due 2025 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument issuer |  | Allegheny Ludlum | Allegheny Ludlum |  |  |  |
Debt instrument interest rate stated percentage |  | 6.95% | 6.95% |  |  |  |
Debt instrument carrying amount |  | $ 150,000,000.0 | $ 150,000,000.0 |  |  |  |
Debt Instrument, Maturity Date |  | Dec. 15, 2025 | Dec. 15, 2025 |  |  |  |
Term Loan due 2024 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument issuer |  | Allegheny Technologies | Allegheny Technologies |  |  |  |
Debt instrument interest rate stated percentage |  | 4.21% |  |  |  |  |
Debt instrument carrying amount |  | $ 200,000,000 | $ 200,000,000.0 |  |  |  |
Debt Instrument, Maturity Date |  | Sep. 30, 2024 | Sep. 30, 2024 |  |  |  |
Domestic Bank Group $500 million asset-based credit facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument carrying amount |  | $ 0 | $ 0 |  |  |  |
Allegheny Technologies, Senior Notes, 5.875, Due 2023 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  | Aug. 15, 2023 |  |  |  |
ATI 2031Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument issuer |  | Allegheny Technologies |  |  |  |  |
Debt instrument interest rate stated percentage |  | 5.125% |  |  |  |  |
Debt instrument carrying amount |  | $ 350,000,000.0 | $ 0 |  |  |  |
Debt Instrument, Maturity Date |  | Oct. 01, 2031 |  |  |  |  |
Debt instrument, term |  | 10 years |  |  |  |  |
ATI 2029 Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument issuer |  | Allegheny Technologies |  |  |  |  |
Debt instrument interest rate stated percentage |  | 4.875% |  |  |  |  |
Debt instrument carrying amount |  | $ 325,000,000 | 0 |  |  |  |
Debt Instrument, Maturity Date |  | Oct. 01, 2029 |  |  |  |  |
Debt instrument, term |  | 8 years |  |  |  |  |
Finance leases and other [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument carrying amount |  | $ 85,700,000 | 48,000,000.0 |  |  |  |
Foreign credit agreements [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument carrying amount |  | $ 27,400,000 | 5,500,000 |  |  |  |
Convertible Debt [Member] | Allegheny Technologies, $287.5 million Convertible Senior Notes, 4.75%, Due 2022 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  | 4.75% |  |  |  |  |
Debt Issuance Costs, Net |  | $ 300,000 | $ 700,000 |  |  |  |
Convertible Debt [Member] | Allegheny Technologies, Convertible Senior Notes, 3.5%, Due 2025 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument issuer |  | Allegheny Technologies | Allegheny Technologies |  |  |  |
Debt instrument interest rate stated percentage |  | 3.50% | 3.50% |  |  |  |
Debt instrument carrying amount |  | $ 291,400,000 | $ 291,400,000 |  |  |  |
Debt Issuance Costs, Net |  | 6,500,000 | 8,200,000 |  |  |  |
Equity component of convertible debt |  | $ 0 | $ (46,800,000) |  | $ (51,400,000) |  |
Debt Instrument, Maturity Date |  | Jun. 15, 2025 | Jun. 15, 2025 |  |  |  |
Maximum | Allegheny Technologies $500 million 5.875% Senior Notes due 2023 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  | 7.875% |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Term Loan due 2024 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable rate spread |  | 2.00% |  |  |  |  |
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum | Domestic Bank Group $500 million asset-based credit facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable rate spread |  | 1.25% |  |  |  |  |
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum | Domestic Bank Group $500 million asset-based credit facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable rate spread |  | 1.75% |  |  |  |  |
[1] | Bearing interest at 7.875% effective February 15, 2016.(b)The payment obligations of these debentures issued by Allegheny Ludlum, LLC are fully and unconditionally guaranteed by ATI.

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