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Debt Schedule of Debt (Details) (USD $)
9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Total Debt $ 1,962,100,000 $ 1,480,100,000
Short-term debt and current portion of long-term debt 419,900,000 17,100,000
Long-term debt 1,542,200,000 1,463,000,000
Allegheny Technologies 5.875% Notes due 2023
   
Debt Instrument [Line Items]    
Long-term Debt, Gross 500,000,000 0
Debt Instrument, Interest Rate, Stated Percentage 5.875%  
Allegheny Technologies 5.95% Notes due 2021
   
Debt Instrument [Line Items]    
Long-term Debt, Gross 500,000,000 500,000,000
Allegheny Technologies 4.25% Convertible Notes due 2014
   
Debt Instrument [Line Items]    
Long-term Debt, Gross 402,500,000 402,500,000
Allegheny Technologies 9.375% Notes due 2019
   
Debt Instrument [Line Items]    
Long-term Debt, Gross 350,000,000 350,000,000
Allegheny Ludlum 6.95% debentures due 2025
   
Debt Instrument [Line Items]    
Long-term Debt, Gross 150,000,000 150,000,000
Debt Instrument, Interest Rate, Stated Percentage 6.95%  
ATI Ladish Series B 6.14% Notes due 2016 (a)
   
Debt Instrument [Line Items]    
Long-term Debt, Gross 18,400,000 24,800,000
Business Acquisition Purchase Price Allocation Notes Payable and L T Debt 1,200,000 1,900,000
ATI Ladish Series C 6.41% Notes due 2015 (b)
   
Debt Instrument [Line Items]    
Long-term Debt, Gross 21,400,000 32,500,000
Business Acquisition Purchase Price Allocation Notes Payable and L T Debt 1,400,000 2,500,000
Domestic Bank Group $400 million unsecured credit facility
   
Debt Instrument [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 400,000,000  
Long-term Debt, Gross 0 0
Foreign credit facilities
   
Debt Instrument [Line Items]    
Long-term Debt, Gross 14,300,000 14,200,000
Industrial revenue bonds, due through 2020, and other
   
Debt Instrument [Line Items]    
Long-term Debt, Gross 5,500,000 6,100,000
ATI Ladish Series B 6.14% Notes due 2016 (a)
   
Debt Instrument [Line Items]    
Debt Instrument, Issuer ATI Ladish  
Debt Instrument, Maturity Date May 16, 2016 May 16, 2016
Debt Instrument, Interest Rate, Stated Percentage 6.14% 6.14%
ATI Ladish Series C 6.41% Notes due 2015 (b)
   
Debt Instrument [Line Items]    
Debt Instrument, Issuer ATI Ladish  
Debt Instrument, Maturity Date Sep. 02, 2015 Sep. 02, 2015
Debt Instrument, Interest Rate, Stated Percentage 6.41% 6.41%
Allegheny Technologies 5.95% Notes due 2021
   
Debt Instrument [Line Items]    
Debt Instrument, Issuer Allegheny Technologies  
Debt Instrument, Maturity Date Jan. 15, 2021 Jan. 15, 2021
Debt Instrument, Interest Rate, Stated Percentage 5.95% 5.95%
Allegheny Technologies 4.25% Convertible Notes due 2014
   
Debt Instrument [Line Items]    
Debt Instrument, Issuer Allegheny Technologies  
Debt Instrument, Maturity Date Jun. 01, 2014 Jun. 01, 2014
Debt Instrument, Interest Rate, Stated Percentage 4.25% 4.25%
Industrial revenue bonds, due through 2020, and other
   
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Range, End Jan. 01, 2020 Jan. 01, 2020
Allegheny Ludlum 6.95% debentures due 2025
   
Debt Instrument [Line Items]    
Debt Instrument, Issuer Allegheny Ludlum  
Debt Instrument, Maturity Date Dec. 15, 2025 Dec. 15, 2025
Debt Instrument, Interest Rate, Stated Percentage   6.95%
Allegheny Technologies 9.375% Notes due 2019
   
Debt Instrument [Line Items]    
Debt Instrument, Issuer Allegheny Technologies  
Debt Instrument, Maturity Date Jun. 01, 2019 Jun. 01, 2019
Debt Instrument, Interest Rate, Stated Percentage 9.375% 9.375%
Domestic Bank Group $400 million unsecured credit facility
   
Debt Instrument [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity   $ 400,000,000