XML 62 R52.htm IDEA: XBRL DOCUMENT v3.20.2
Debt Schedule of Debt (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Jul. 02, 2020
Jun. 30, 2020
Feb. 15, 2016
Dec. 31, 2013
Debt Instrument [Line Items]            
Debt Issuance Costs, Net $ (15,200,000) $ (12,300,000)        
Total Debt 1,541,200,000 1,398,900,000        
Short-term debt and current portion of long-term debt 12,200,000 11,500,000        
Long-term debt 1,529,000,000.0 1,387,400,000        
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          
Interest rate 7.875%       7.875% 5.875%
Debt Instrument, Maturity Date Aug. 15, 2023 Aug. 15, 2023        
Allegheny Technologies 5.875% Notes due 2027            
Debt Instrument [Line Items]            
Debt, Gross $ 350,000,000.0 $ 350,000,000.0        
Debt Instrument, Issuer Allegheny Technologies          
Interest rate 5.875%          
Debt Instrument, Maturity Date Dec. 01, 2027 Dec. 01, 2027        
Allegheny Technologies 3.5% Convertible Senior Notes due 2025 | Convertible Debt            
Debt Instrument [Line Items]            
Debt, Gross $ 291,400,000 $ 0 $ 6,400,000 $ 285,000,000.0    
Equity component of convertible debt $ (49,000,000.0) 0 $ (51,400,000)      
Debt Instrument, Issuer Allegheny Technologies          
Interest rate 3.50%          
Debt Instrument, Maturity Date Jun. 15, 2025          
Allegheny Technologies 4.75% Convertible Senior Notes due 2022            
Debt Instrument [Line Items]            
Debt, Gross $ 84,200,000 $ 287,500,000        
Debt Instrument, Issuer Allegheny Technologies          
Interest rate 4.75%          
Debt Instrument, Maturity Date Jul. 01, 2022 Jul. 01, 2022        
Allegheny Ludlum 6.95% Debentures due 2025            
Debt Instrument [Line Items]            
Debt, Gross $ 150,000,000.0 $ 150,000,000.0        
Debt Instrument, Issuer Allegheny Ludlum          
Interest rate 6.95%          
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          
Interest rate 4.21%          
Debt Instrument, Maturity Date Sep. 30, 2024 Sep. 30, 2024        
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 4,200,000 4,900,000        
Other            
Debt Instrument [Line Items]            
Debt, Gross $ 25,600,000 $ 18,800,000        
[1] Bearing interest at 7.875% effective February 15, 2016.