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Debt - Narrative (Details) | 12 Months Ended |  |  |  |  |
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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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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1D -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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