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Debt Narrative (Details)
 9 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2014
USD ($)
Sep. 30, 2013
USD ($)
Sep. 30, 2014
Convertible Debt [Member]
USD ($)
Dec. 31, 2013
Convertible Debt [Member]
USD ($)
Sep. 30, 2014
Allegheny Technologies 5.875% Notes due 2023
USD ($)
Dec. 31, 2013
Allegheny Technologies 5.875% Notes due 2023
USD ($)
Sep. 30, 2014
Domestic Bank Group $400 million unsecured credit facility
USD ($)
Dec. 31, 2013
Domestic Bank Group $400 million unsecured credit facility
USD ($)
Sep. 30, 2014
Seperateletter of Credit Facility
USD ($)
Sep. 30, 2014
STAL Revolving Credit Facility
USD ($)
Sep. 30, 2014
STAL Revolving Credit Facility
CNY
Sep. 30, 2014
STAL Precision Stainless Steel Company Limited
Sep. 30, 2014
STAL Revolving Credit Facility
Sep. 30, 2014
Allegheny Technologies 4.25% Convertible Notes due 2014
USD ($)
Dec. 31, 2013
Allegheny Technologies 4.25% Convertible Notes due 2014
Debt Instrument [Line Items]                              
Stock Issued During Period, Shares, Conversion of Convertible Securities                           120,476  
Debt Instrument, Interest Rate, Stated Percentage         5.875% 5.875%                 4.25%
Conversion of convertible notes $ 5,000,000                         $ 5,000,000  
Line of Credit Facility, Maximum Borrowing Capacity             400,000,000     33,000,000 205,000,000        
Debt Instrument, Covenant, Maximum Leverage Ratio, Period One             4.0                
Debt Instrument, Covenant, Maximum Leverage Ratio, Period Two             5.75                
Debt Instrument, Covenant, Maximum Leverage Ratio, Period Three             5.0                
Debt Instrument, Covenant, Maximum Leverage Ratio, Period Four             4.5                
Debt Instrument, Covenant, Maximum Leverage Ratio, Period Five             3.75                
Debt Instrument, Covenant, Maximum Leverage Ratio, Period Six             3.5                
Debt Instrument, Covenant, Minimum Interest Coverage Ratio, Period One             2.0                
Debt Instrument, Covenant, Maximum Interest Coverage Ratio, Period Two             2.5                
Debt Instrument, Covenant, Maximum Interest Coverage Ratio, Period Three             3.0                
Debt Instrument, Covenant, Minimum Interest Coverage Ratio, Period Four             3.25                
Debt Instrument, Covenant, Minimum Interest Coverage Ratio, Period Five             3.5                
Debt Instrument, Covenant, Leverage Ratio             2.13                
Debt Instrument, Covenant, Interest Coverage Ratio             4.62                
Amount of Cash on Hand Used to Reduce the Indebtness Figure used in the Leverage Ratio Calculation             50,000,000                
Long-term Debt, Gross     0 402,500,000 500,000,000 500,000,000 0 0              
Line of Credit Facility, Amount Outstanding             5,100,000                
Letters of Credit Outstanding, Amount                 32,000,000            
Noncontrolling Interest, Ownership Percentage by Parent                       60.00%      
Line of Credit Facility, Expiration Date                         Aug. 08, 2014    
Debt Instrument, Convertible, Conversion Ratio     23.9263                        
Debt Instrument, Convertible, Conversion Price     $ 41.795                        
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities $ 414,700,000 $ 17,000,000                       $ 397,500,000