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Debt Narrative (Details) - Long-term Debt, Type [Domain] - Line of Credit Facility, Lender [Domain]
 6 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Feb. 15, 2015
Dec. 31, 2014
USD ($)
Dec. 31, 2013
Debt Instrument [Line Items]            
Payments on long-term debt and capital leases $ 6,300,000 $ 403,400,000        
Allegheny Technologies 5.875% Notes due 2023 (a)            
Debt Instrument [Line Items]            
Interest rate 6.375%     6.375% 6.125% 5.875%
Long-term Debt, Gross [1] $ 500,000,000       $ 500,000,000  
Domestic Bank Group $400 million credit facility            
Debt Instrument [Line Items]            
Long-term Debt, Gross 0       $ 0  
Maximum borrowing capacity 400,000,000          
Amount utilized to support the issuance of letters of credit 4,600,000          
Average borrowings during period $ 49,800,000          
Line of Credit Facility, Interest Rate During Period 2.10%          
Amount of Cash on Hand Used to Reduce the Indebtness Figure used in the Leverage Ratio Calculation $ 50,000,000          
Maximum leverage ratio for the quarter ended June 30, 2015 4.50          
Maximum leverage ratio for the quarter ended September 30, 2015 3.75          
Maximum leverage ratio for the quarter ended December 31, 2015 and for each fiscal quarter thereafter 3.50          
Minimum interest coverage ratio for the quarter ended June 30, 2015 3.00          
Minimum interest coverage ratio for the quarter ended September 30, 2015 3.25          
Minimum interest coverage ratio for the quarter ended December 31, 2015 and for each fiscal quarter thereafter 3.50          
Actual leverage ratio 3.93          
Actual interest coverage ratio 3.13          
Seperateletter of Credit Facility            
Debt Instrument [Line Items]            
Letters of credit outstanding $ 32,000,000          
STAL Precision Stainless Steel Company Limited            
Debt Instrument [Line Items]            
Noncontrolling Interest, Ownership Percentage by Parent 60.00%          
Scenario, Forecast [Member] | Domestic Bank Group $400 million asset-based credit facility [Member]            
Debt Instrument [Line Items]            
Maximum borrowing capacity     $ 400,000,000      
Scenario, Forecast [Member] | STAL Revolving Credit Facility            
Debt Instrument [Line Items]            
Maximum borrowing capacity     $ 20,000,000      
[1] Bearing interest at 6.375% effective February 15, 2015.