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Debt Schedule of Debt (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Feb. 15, 2016
Dec. 31, 2013
Debt Instrument [Line Items]        
Deferred Finance Costs, Noncurrent, Net $ (18.0) $ (9.5)    
Total Debt 1,875.8 1,495.7    
Short-term debt and current portion of long-term debt 5.4 3.9    
Long-term debt 1,870.4 1,491.8    
Allegheny Technologies, Convertible Senior Notes, 4.75%, Due 2022 [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Gross $ 287.5 0.0    
Debt Instrument, Issuer Allegheny Technologies      
Debt Instrument, Maturity Date Jul. 01, 2022      
Interest rate 4.75%      
Allegheny Technologies 5.875% Notes due 2023 (a)        
Debt Instrument [Line Items]        
Long-term Debt, Gross [1] $ 500.0 $ 500.0    
Debt Instrument, Issuer Allegheny Technologies      
Debt Instrument, Maturity Date Aug. 15, 2023 Aug. 15, 2023    
Interest rate 7.875% 7.625% 7.875% 5.875%
Allegheny Technologies 5.95% Notes due 2021        
Debt Instrument [Line Items]        
Long-term Debt, Gross $ 500.0 $ 500.0    
Debt Instrument, Issuer Allegheny Technologies      
Debt Instrument, Maturity Date Jan. 15, 2021 Jan. 15, 2021    
Interest rate 5.95% 5.95%    
Allegheny Technologies 9.375% Notes due 2019        
Debt Instrument [Line Items]        
Long-term Debt, Gross $ 350.0 $ 350.0    
Debt Instrument, Issuer Allegheny Technologies      
Debt Instrument, Maturity Date Jun. 01, 2019 Jun. 01, 2019    
Interest rate 9.375% 9.375%    
Allegheny Ludlum 6.95% debentures due 2025        
Debt Instrument [Line Items]        
Long-term Debt, Gross $ 150.0 $ 150.0    
Debt Instrument, Issuer Allegheny Ludlum      
Debt Instrument, Maturity Date Dec. 15, 2025 Dec. 15, 2025    
Interest rate 6.95% 6.95%    
Domestic Bank Group $400 million asset-based credit facility        
Debt Instrument [Line Items]        
Long-term Debt, Gross $ 0.0 $ 0.0    
2017 Term Loan        
Debt Instrument [Line Items]        
Long-term Debt, Gross $ 100.0 0.0    
Debt Instrument, Issuer Allegheny Technologies      
Debt Instrument, Maturity Date Nov. 13, 2017      
Foreign credit facilities        
Debt Instrument [Line Items]        
Long-term Debt, Gross $ 3.8 1.4    
Industrial revenue bonds, due through 2020, and other        
Debt Instrument [Line Items]        
Long-term Debt, Gross $ 2.5 $ 3.8    
Debt Instrument, Maturity Date Range, End Jan. 01, 2020 Jan. 01, 2020    
[1] Bearing interest at 7.875% effective February 15, 2016.