XML 62 R52.htm IDEA: XBRL DOCUMENT v3.20.2
Debt Schedule of Debt (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Feb. 15, 2016
Dec. 31, 2013
Debt Instrument [Line Items]        
Debt Issuance Costs, Net $ (16,100,000) $ (12,300,000)    
Total Debt 1,529,700,000 1,398,900,000    
Short-term debt and current portion of long-term debt 12,800,000 11,500,000    
Long-term debt 1,516,900,000 1,387,400,000    
Allegheny Technologies, Convertible Senior Notes, 4.75%, Due 2022        
Debt Instrument [Line Items]        
Debt, Gross $ 84,200,000 287,500,000    
Allegheny Technologies, Convertible Senior Notes, 4.75%, Due 2022 | Convertible Debt        
Debt Instrument [Line Items]        
Interest rate 4.75%      
Allegheny Technologies 5.875% Notes due 2023 (a)        
Debt Instrument [Line Items]        
Debt, Gross [1] $ 500,000,000.0 $ 500,000,000.0    
Debt Instrument, Issuer Allegheny Technologies      
Debt Instrument, Maturity Date Aug. 15, 2023 Aug. 15, 2023    
Interest rate     7.875% 5.875%
ATI 2027 Notes [Member]        
Debt Instrument [Line Items]        
Debt, Gross $ 350,000,000.0 $ 350,000,000.0    
Debt Instrument, Maturity Date Dec. 01, 2027 Dec. 01, 2027    
Allegheny Ludlum 6.95% debentures due 2025        
Debt Instrument [Line Items]        
Debt, Gross $ 150,000,000.0 $ 150,000,000.0    
Debt Instrument, Maturity Date Dec. 15, 2025 Dec. 15, 2025    
2024 Term Loan        
Debt Instrument [Line Items]        
Debt, Gross $ 200,000,000 $ 100,000,000.0    
Debt Instrument, Issuer Allegheny Technologies      
Debt Instrument, Maturity Date Sep. 30, 2024 Sep. 30, 2024    
Interest rate 4.21%      
Domestic Bank Group $500 million asset-based credit facility        
Debt Instrument [Line Items]        
Short-term Debt $ 0 $ 0    
Foreign credit facilities        
Debt Instrument [Line Items]        
Short-term Debt 5,600,000 4,900,000    
Other        
Debt Instrument [Line Items]        
Debt, Gross 21,300,000 18,800,000    
Allegheny Technologies, Convertible Senior Notes, 3.5%, Due 2025 | Convertible Debt        
Debt Instrument [Line Items]        
Debt, Gross 285,000,000.0 0    
Equity component of convertible debt $ (50,300,000) $ 0    
Debt Instrument, Maturity Date Jun. 15, 2025      
Interest rate 3.50%      
[1] Bearing interest at 7.875% effective February 15, 2016.