Document and Entity Information
Document and Entity Information | Jun. 22, 2020 |
Cover [Abstract] | |
Entity Registrant Name | ALLEGHENY TECHNOLOGIES INC |
Amendment Flag | false |
Entity Central Index Key | 0001018963 |
Document Type | 8-K |
Document Period End Date | Jun. 22, 2020 |
Entity Incorporation State Country Code | DE |
Entity File Number | 1-12001 |
Entity Tax Identification Number | 25-1792394 |
Entity Address, Address Line One | 1000 Six PPG Place |
Entity Address, City or Town | Pittsburgh |
Entity Address, State or Province | PA |
Entity Address, Postal Zip Code | 15222-5479 |
City Area Code | (412) |
Local Phone Number | 394-2800 |
Written Communications | false |
Soliciting Material | false |
Pre Commencement Tender Offer | false |
Pre Commencement Issuer Tender Offer | false |
Security 12b Title | Common Stock, par value $0.10 per share |
Trading Symbol | ATI |
Security Exchange Name | NYSE |
Entity Emerging Growth Company | false |