| | | | | | | | | | | | | | | | | | | | | |
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| | <period> |
| | | <startDate> 2021-01-28 </startDate> |
| | | <endDate> 2021-01-28 </endDate> |
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| <dei:EntityAddressCityOrTown contextRef="i5218a0e4ab594c25a55da7f91828e370_D20210128-20210128" id="id3VybDovL2RvY3MudjEvZG9jOmNmOTU3MWYxNTQ4ZjQ1ZWFiMWFhYjM3NmZlNTljM2MyL3NlYzpjZjk1NzFmMTU0OGY0NWVhYjFhYWIzNzZmZTU5YzNjMl8xL2ZyYWc6ODZmNTM2NWE3ZjNhNGM5NGE1ODkyNjc4NjAxZDljZjcvdGFibGU6NjczY2VhYzRlZjFmNDk4ZWIyMGVmYzZmNWEzOGZmZjcvdGFibGVyYW5nZTo2NzNjZWFjNGVmMWY0OThlYjIwZWZjNmY1YTM4ZmZmN18xLTEtMS0xLTA_e0771bf9-699c-45ab-ab5d-3ca3fa8023d0"> Pittsburgh, </dei:EntityAddressCityOrTown> |
| <dei:EntityAddressStateOrProvince contextRef="i5218a0e4ab594c25a55da7f91828e370_D20210128-20210128" id="id3VybDovL2RvY3MudjEvZG9jOmNmOTU3MWYxNTQ4ZjQ1ZWFiMWFhYjM3NmZlNTljM2MyL3NlYzpjZjk1NzFmMTU0OGY0NWVhYjFhYWIzNzZmZTU5YzNjMl8xL2ZyYWc6ODZmNTM2NWE3ZjNhNGM5NGE1ODkyNjc4NjAxZDljZjcvdGFibGU6NjczY2VhYzRlZjFmNDk4ZWIyMGVmYzZmNWEzOGZmZjcvdGFibGVyYW5nZTo2NzNjZWFjNGVmMWY0OThlYjIwZWZjNmY1YTM4ZmZmN18xLTItMS0xLTA_b1945a88-ebbb-4c11-8cad-db9ba492efcd"> PA </dei:EntityAddressStateOrProvince> |
| <dei:EntityAddressPostalZipCode contextRef="i5218a0e4ab594c25a55da7f91828e370_D20210128-20210128" id="id3VybDovL2RvY3MudjEvZG9jOmNmOTU3MWYxNTQ4ZjQ1ZWFiMWFhYjM3NmZlNTljM2MyL3NlYzpjZjk1NzFmMTU0OGY0NWVhYjFhYWIzNzZmZTU5YzNjMl8xL2ZyYWc6ODZmNTM2NWE3ZjNhNGM5NGE1ODkyNjc4NjAxZDljZjcvdGFibGU6NjczY2VhYzRlZjFmNDk4ZWIyMGVmYzZmNWEzOGZmZjcvdGFibGVyYW5nZTo2NzNjZWFjNGVmMWY0OThlYjIwZWZjNmY1YTM4ZmZmN18xLTQtMS0xLTA_78f738b4-41f8-4d83-893c-5b97b9f72092"> 15222-5479 </dei:EntityAddressPostalZipCode> |
| <dei:CityAreaCode contextRef="i5218a0e4ab594c25a55da7f91828e370_D20210128-20210128" id="id3VybDovL2RvY3MudjEvZG9jOmNmOTU3MWYxNTQ4ZjQ1ZWFiMWFhYjM3NmZlNTljM2MyL3NlYzpjZjk1NzFmMTU0OGY0NWVhYjFhYWIzNzZmZTU5YzNjMl8xL2ZyYWc6ODZmNTM2NWE3ZjNhNGM5NGE1ODkyNjc4NjAxZDljZjcvdGV4dHJlZ2lvbjo4NmY1MzY1YTdmM2E0Yzk0YTU4OTI2Nzg2MDFkOWNmN18xMzc3_467e6565-f15f-44f1-9285-bcd5e8aea008"> 412 </dei:CityAreaCode> |
| <dei:LocalPhoneNumber contextRef="i5218a0e4ab594c25a55da7f91828e370_D20210128-20210128" id="id3VybDovL2RvY3MudjEvZG9jOmNmOTU3MWYxNTQ4ZjQ1ZWFiMWFhYjM3NmZlNTljM2MyL3NlYzpjZjk1NzFmMTU0OGY0NWVhYjFhYWIzNzZmZTU5YzNjMl8xL2ZyYWc6ODZmNTM2NWE3ZjNhNGM5NGE1ODkyNjc4NjAxZDljZjcvdGV4dHJlZ2lvbjo4NmY1MzY1YTdmM2E0Yzk0YTU4OTI2Nzg2MDFkOWNmN18xMzc4_c4ab2803-b3e2-469f-bc63-2519c37b9aea"> 394-2800 </dei:LocalPhoneNumber> |
| <dei:WrittenCommunications contextRef="i5218a0e4ab594c25a55da7f91828e370_D20210128-20210128" id="id3VybDovL2RvY3MudjEvZG9jOmNmOTU3MWYxNTQ4ZjQ1ZWFiMWFhYjM3NmZlNTljM2MyL3NlYzpjZjk1NzFmMTU0OGY0NWVhYjFhYWIzNzZmZTU5YzNjMl8xL2ZyYWc6ODZmNTM2NWE3ZjNhNGM5NGE1ODkyNjc4NjAxZDljZjcvdGFibGU6ZTZhNzBmMzQzNTI0NDJkOWIyZDY2MTMzMTdiMzE3YjUvdGFibGVyYW5nZTplNmE3MGYzNDM1MjQ0MmQ5YjJkNjYxMzMxN2IzMTdiNV8wLTEtMS0xLTA_c0eca86c-dafa-49e4-8c9f-2bb40ba5b494"> false </dei:WrittenCommunications> |
| <dei:SolicitingMaterial contextRef="i5218a0e4ab594c25a55da7f91828e370_D20210128-20210128" id="id3VybDovL2RvY3MudjEvZG9jOmNmOTU3MWYxNTQ4ZjQ1ZWFiMWFhYjM3NmZlNTljM2MyL3NlYzpjZjk1NzFmMTU0OGY0NWVhYjFhYWIzNzZmZTU5YzNjMl8xL2ZyYWc6ODZmNTM2NWE3ZjNhNGM5NGE1ODkyNjc4NjAxZDljZjcvdGFibGU6OGFhYTFiMjRiNmIyNDE0Yzk2YjYzNjEwNDBmYjczNGIvdGFibGVyYW5nZTo4YWFhMWIyNGI2YjI0MTRjOTZiNjM2MTA0MGZiNzM0Yl8wLTEtMS0xLTA_3e248827-7ae7-4119-8229-4ef837144b52"> false </dei:SolicitingMaterial> |
| <dei:PreCommencementTenderOffer contextRef="i5218a0e4ab594c25a55da7f91828e370_D20210128-20210128" id="id3VybDovL2RvY3MudjEvZG9jOmNmOTU3MWYxNTQ4ZjQ1ZWFiMWFhYjM3NmZlNTljM2MyL3NlYzpjZjk1NzFmMTU0OGY0NWVhYjFhYWIzNzZmZTU5YzNjMl8xL2ZyYWc6ODZmNTM2NWE3ZjNhNGM5NGE1ODkyNjc4NjAxZDljZjcvdGFibGU6ZDg2ZTE0NGU0YmJjNGVkMjk1ZWY0NjI4YTc1YzRhZmYvdGFibGVyYW5nZTpkODZlMTQ0ZTRiYmM0ZWQyOTVlZjQ2MjhhNzVjNGFmZl8wLTEtMS0xLTA_6abd9ba2-b406-4d0e-8298-1a05d876a08e"> false </dei:PreCommencementTenderOffer> |
| <dei:PreCommencementIssuerTenderOffer contextRef="i5218a0e4ab594c25a55da7f91828e370_D20210128-20210128" id="id3VybDovL2RvY3MudjEvZG9jOmNmOTU3MWYxNTQ4ZjQ1ZWFiMWFhYjM3NmZlNTljM2MyL3NlYzpjZjk1NzFmMTU0OGY0NWVhYjFhYWIzNzZmZTU5YzNjMl8xL2ZyYWc6ODZmNTM2NWE3ZjNhNGM5NGE1ODkyNjc4NjAxZDljZjcvdGFibGU6YmU4ZmFiMTdlZjMxNDkxMmJlYjZjNmI0NzgyMGI3OTcvdGFibGVyYW5nZTpiZThmYWIxN2VmMzE0OTEyYmViNmM2YjQ3ODIwYjc5N18wLTEtMS0xLTA_0c92080e-b44d-4500-9f45-cf0313389b1b"> false </dei:PreCommencementIssuerTenderOffer> |
| <dei:Security12bTitle contextRef="i5218a0e4ab594c25a55da7f91828e370_D20210128-20210128" id="id3VybDovL2RvY3MudjEvZG9jOmNmOTU3MWYxNTQ4ZjQ1ZWFiMWFhYjM3NmZlNTljM2MyL3NlYzpjZjk1NzFmMTU0OGY0NWVhYjFhYWIzNzZmZTU5YzNjMl8xL2ZyYWc6ODZmNTM2NWE3ZjNhNGM5NGE1ODkyNjc4NjAxZDljZjcvdGFibGU6OGM4ZjMyMWFkZmMyNDE2ZGE4Y2Y4ZDA2MmRiMDcwMWUvdGFibGVyYW5nZTo4YzhmMzIxYWRmYzI0MTZkYThjZjhkMDYyZGIwNzAxZV8yLTAtMS0xLTA_dcd4d457-ec3d-4f04-a79f-c8e49d493238"> Common Stock, par value $0.10 per share </dei:Security12bTitle> |
| <dei:TradingSymbol contextRef="i5218a0e4ab594c25a55da7f91828e370_D20210128-20210128" id="id3VybDovL2RvY3MudjEvZG9jOmNmOTU3MWYxNTQ4ZjQ1ZWFiMWFhYjM3NmZlNTljM2MyL3NlYzpjZjk1NzFmMTU0OGY0NWVhYjFhYWIzNzZmZTU5YzNjMl8xL2ZyYWc6ODZmNTM2NWE3ZjNhNGM5NGE1ODkyNjc4NjAxZDljZjcvdGFibGU6OGM4ZjMyMWFkZmMyNDE2ZGE4Y2Y4ZDA2MmRiMDcwMWUvdGFibGVyYW5nZTo4YzhmMzIxYWRmYzI0MTZkYThjZjhkMDYyZGIwNzAxZV8yLTItMS0xLTA_8a653f2e-7466-4f95-a00a-498b6589b573"> ATI </dei:TradingSymbol> |
| <dei:SecurityExchangeName contextRef="i5218a0e4ab594c25a55da7f91828e370_D20210128-20210128" id="id3VybDovL2RvY3MudjEvZG9jOmNmOTU3MWYxNTQ4ZjQ1ZWFiMWFhYjM3NmZlNTljM2MyL3NlYzpjZjk1NzFmMTU0OGY0NWVhYjFhYWIzNzZmZTU5YzNjMl8xL2ZyYWc6ODZmNTM2NWE3ZjNhNGM5NGE1ODkyNjc4NjAxZDljZjcvdGFibGU6OGM4ZjMyMWFkZmMyNDE2ZGE4Y2Y4ZDA2MmRiMDcwMWUvdGFibGVyYW5nZTo4YzhmMzIxYWRmYzI0MTZkYThjZjhkMDYyZGIwNzAxZV8yLTQtMS0xLTA_43a48f61-dd14-4bde-b22b-f6a2f7b6bac3"> NYSE </dei:SecurityExchangeName> |
| <dei:EntityEmergingGrowthCompany contextRef="i5218a0e4ab594c25a55da7f91828e370_D20210128-20210128" id="id3VybDovL2RvY3MudjEvZG9jOmNmOTU3MWYxNTQ4ZjQ1ZWFiMWFhYjM3NmZlNTljM2MyL3NlYzpjZjk1NzFmMTU0OGY0NWVhYjFhYWIzNzZmZTU5YzNjMl8xL2ZyYWc6ODZmNTM2NWE3ZjNhNGM5NGE1ODkyNjc4NjAxZDljZjcvdGV4dHJlZ2lvbjo4NmY1MzY1YTdmM2E0Yzk0YTU4OTI2Nzg2MDFkOWNmN18xMzc5_d09d31cd-66be-4320-b811-03783a27c24a"> false </dei:EntityEmergingGrowthCompany> |
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