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Debt Schedule of Debt (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Feb. 15, 2015
Dec. 31, 2013
Debt Instrument [Line Items]        
Total Debt $ 1,505.6 $ 1,526.9    
Short-term debt and current portion of long-term debt 4.0 17.8    
Long-term debt 1,501.6 1,509.1    
Domestic Bank Group $400 million asset-based credit facility        
Debt Instrument [Line Items]        
Long-term Debt, Gross 0.0      
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 6.625% 6.125% 6.625% 5.875%
Allegheny Technologies 5.95% Notes due 2021        
Debt Instrument [Line Items]        
Long-term Debt, Gross $ 500.0 $ 500.0    
Allegheny Technologies 9.375% Notes due 2019        
Debt Instrument [Line Items]        
Long-term Debt, Gross 350.0 350.0    
Allegheny Ludlum 6.95% debentures due 2025        
Debt Instrument [Line Items]        
Long-term Debt, Gross $ 150.0 150.0    
Interest rate 6.95%      
ATI Ladish Series B 6.14% Notes due 2016 (b)        
Debt Instrument [Line Items]        
Long-term Debt, Gross [2] $ 0.0 11.9    
Business Acquisition Purchase Price Allocation Notes Payable and L T Debt   0.4    
ATI Ladish Series C 6.41% Notes due 2015 (c)        
Debt Instrument [Line Items]        
Long-term Debt, Gross [3] 0.0 10.3    
Business Acquisition Purchase Price Allocation Notes Payable and L T Debt   0.3    
Domestic Bank Group $400 million credit facility        
Debt Instrument [Line Items]        
Long-term Debt, Gross   0.0    
Foreign credit facilities        
Debt Instrument [Line Items]        
Long-term Debt, Gross 1.7 0.0    
Industrial revenue bonds, due through 2020, and other        
Debt Instrument [Line Items]        
Long-term Debt, Gross $ 3.9 $ 4.7    
ATI Ladish Series B 6.14% Notes due 2016 (b)        
Debt Instrument [Line Items]        
Debt Instrument, Issuer   ATI Ladish    
Debt Instrument, Maturity Date   May 16, 2016    
Interest rate   6.14%    
ATI Ladish Series C 6.41% Notes due 2015 (c)        
Debt Instrument [Line Items]        
Debt Instrument, Issuer   ATI Ladish    
Debt Instrument, Maturity Date   Sep. 02, 2015    
Interest rate   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    
Interest rate 5.95% 5.95%    
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    
Interest rate   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    
Interest rate 9.375% 9.375%    
Revolving credit facility | Domestic Bank Group $400 million asset-based credit facility        
Debt Instrument [Line Items]        
Long-term Debt, Gross $ 0.0      
[1] Bearing interest at 6.625% effective February 15, 2015.
[2] Includes fair value adjustments of $0.4 million at December 31, 2014.
[3] Includes fair value adjustments of $0.3 million at December 31, 2014.