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Debt Narrative (Details)
 3 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2014
Convertible Debt [Member]
USD ($)
Dec. 31, 2013
Convertible Debt [Member]
USD ($)
Mar. 31, 2014
Allegheny Technologies 5.875% Notes due 2023
USD ($)
Dec. 31, 2013
Allegheny Technologies 5.875% Notes due 2023
USD ($)
Mar. 31, 2014
Domestic Bank Group $400 million unsecured credit facility
USD ($)
Dec. 31, 2013
Domestic Bank Group $400 million unsecured credit facility
USD ($)
Mar. 31, 2014
Seperateletter of Credit Facility
USD ($)
Mar. 31, 2014
STAL Revolving Credit Facility
USD ($)
Mar. 31, 2014
STAL Revolving Credit Facility
CNY
Mar. 31, 2014
STAL Precision Stainless Steel Company Limited
Mar. 31, 2014
STAL Revolving Credit Facility
Debt Instrument [Line Items]                      
Debt Instrument, Interest Rate, Stated Percentage     5.875% 5.875%              
Line of Credit Facility, Maximum Borrowing Capacity         $ 400,000,000     $ 33,000,000 205,000,000    
Line of Credit Facility, Borrowing Capacity Increase Limit         100,000,000            
Debt Instrument, Covenant, Maximum Leverage Ratio, Period One         4.0            
Debt Instrument, Covenant, Maximum Leverage Ratio, Period Two         3.75            
Debt Instrument, Covenant, Maximum Leverage Ratio, Period Three         3.50            
Debt Instrument, Covenant, Minimum Interest Coverage Ratio, Period One         2.0            
Debt Instrument, Covenant, Leverage Ratio         1.91            
Debt Instrument, Covenant, Interest Coverage Ratio         5.57            
Amount of Cash on Hand Used to Reduce the Indebtness Figure used in the Leverage Ratio Calculation         50,000,000            
Long-term Debt, Gross 402,500,000 402,500,000 500,000,000 500,000,000 0 0          
Line of Credit Facility, Amount Outstanding         7,000,000     0      
Sublimit for letters of credit         200,000,000            
Letters of Credit Outstanding, Amount             $ 32,000,000        
Noncontrolling Interest, Ownership Percentage by Parent                   60.00%  
Line of Credit Facility, Expiration Date                     Aug. 01, 2014
Debt Instrument, Convertible, Conversion Ratio 23.9263                    
Debt Instrument, Convertible, Number of Equity Instruments 9,630,336                    
Debt Instrument, Convertible, Conversion Price $ 41.795