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Debt - Schedule of Debt (Details) - USD ($) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Sep. 09, 2022 | Sep. 08, 2022 | Dec. 31, 2020 | Jul. 02, 2020
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Issuance Costs, Net | $ 17,200,000 | $ 20,800,000 |  |  |  |
Total short-term and long-term debt | 1,748,000,000 | 1,842,900,000 |  |  |  |
Short-term debt and current portion of long-term debt | 41,700,000 | 131,300,000 |  |  |  |
Total long-term debt | $ 1,706,300,000 | $ 1,711,600,000 |  |  |  |
ATI $350 million 5.875% Senior Notes due 2027 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument issuer | ATI Inc. | ATI Inc. |  |  |  |
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 |  |  |  |
ATI $287.5 million Convertible Senior Notes, 4.75%, Due 2022 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument issuer |  | ATI Inc. |  |  |  |
Debt instrument interest rate stated percentage |  | 4.75% |  |  |  |
Debt instrument carrying amount | $ 0 | $ 84,200,000 |  |  |  |
Debt Instrument, Maturity Date |  | 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 |  |  |  |
ATI 2031Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument issuer | ATI Inc. | ATI Inc. |  |  |  |
Debt instrument interest rate stated percentage | 5.125% | 5.125% |  |  |  |
Debt instrument carrying amount | $ 350,000,000.0 | $ 350,000,000.0 |  |  |  |
Debt Instrument, Maturity Date | Oct. 01, 2031 | Oct. 01, 2031 |  |  |  |
Debt instrument, term | 10 years |  |  |  |  |
ATI 2029 Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument issuer | ATI Inc. | ATI Inc. |  |  |  |
Debt instrument interest rate stated percentage | 4.875% | 4.875% |  |  |  |
Debt instrument carrying amount | $ 325,000,000.0 | $ 325,000,000.0 |  |  |  |
Debt Instrument, Maturity Date | Oct. 01, 2029 | Oct. 01, 2029 |  |  |  |
Debt instrument, term | 8 years |  |  |  |  |
2027 Term Loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument issuer | ATI Inc. | ATI Inc. |  |  |  |
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, 2027 | Sep. 30, 2027 |  |  |  |
Domestic Bank Group $600 million asset-based credit facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Short-Term Debt | $ 0 | $ 0 |  |  |  |
Finance leases and other [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument carrying amount | 79,400,000 | 85,700,000 |  |  |  |
Foreign credit agreements [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument carrying amount | $ 19,400,000 | $ 27,400,000 |  |  |  |
Convertible Debt [Member] | ATI $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 |  |  |  |
Convertible Debt [Member] | ATI Convertible Senior Notes, 3.5%, Due 2025 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument issuer | ATI Inc. | ATI Inc. |  |  |  |
Debt instrument interest rate stated percentage | 3.50% | 3.50% |  |  |  |
Debt instrument carrying amount | $ 291,400,000 | $ 291,400,000 |  |  |  |
Debt Issuance Costs, Net | $ 4,800,000 | $ 6,500,000 |  |  |  |
Equity component of convertible debt |  |  |  |  | $ (46,800,000) | $ (51,400,000)
Debt Instrument, Maturity Date | Jun. 15, 2025 | Jun. 15, 2025 |  |  |  |
Revolving Credit Facility [Member] | Domestic Bank Group $600 million asset-based credit facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Issuance Costs, Net |  |  | $ 2,400,000 | $ 1,700,000 |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 3: 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)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 + Details
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