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Debt Schedule of Debt (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Feb. 15, 2016
Dec. 31, 2013
Debt Instrument [Line Items]          
Debt Issuance Costs, Net $ 16.0 $ 16.0 $ 17.1    
Total Debt 1,944.1 1,944.1 1,877.0    
Short term debt and current portion of long-term debt 67.5 67.5 105.1    
Long-term debt 1,876.6 1,876.6 1,771.9    
Allegheny Technologies, Convertible Senior Notes, 4.75%, Due 2022 [Member]          
Debt Instrument [Line Items]          
Long-term Debt, Gross $ 287.5 $ 287.5 $ 287.5    
Debt Instrument, Issuer Allegheny Technologies        
Debt Instrument, Maturity Date   Jul. 01, 2022 Jul. 01, 2022    
Interest rate 4.75% 4.75% 4.75%    
Allegheny Technologies 5.875% Notes due 2023 (a)          
Debt Instrument [Line Items]          
Long-term Debt, Gross [1] $ 500.0 $ 500.0 $ 500.0    
Debt Instrument, Issuer Allegheny Technologies        
Debt Instrument, Maturity Date   Aug. 15, 2023 Aug. 15, 2023    
Interest rate 7.875% 7.875% 7.875% 7.875% 5.875%
Allegheny Technologies 5.95% Notes due 2021          
Debt Instrument [Line Items]          
Long-term Debt, Gross $ 500.0 $ 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% 5.95%    
Allegheny Technologies 9.375% Notes due 2019          
Debt Instrument [Line Items]          
Long-term Debt, Gross $ 350.0 $ 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% 9.375%    
Allegheny Ludlum 6.95% debentures due 2025          
Debt Instrument [Line Items]          
Long-term Debt, Gross $ 150.0 $ 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% 6.95%    
2022 Term Loan [Member]          
Debt Instrument [Line Items]          
Long-term Debt, Gross $ 100.0 $ 100.0 $ 100.0    
Debt Instrument, Issuer Allegheny Technologies        
Debt Instrument, Maturity Date   Feb. 28, 2022 Nov. 13, 2017    
Domestic Bank Group $400 million asset-based credit facility          
Debt Instrument [Line Items]          
Short-term Debt $ 60.0 $ 60.0 $ 0.0    
Foreign credit facilities          
Debt Instrument [Line Items]          
Short-term Debt 4.0 4.0 4.4    
Other          
Debt Instrument [Line Items]          
Long-term Debt, Gross $ 8.6 $ 8.6 $ 2.2    
[1] Bearing interest at 7.875% effective February 15, 2016.