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Debt - Narrative (Details)
 12 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Jul. 12, 2013
Allegheny Technologies $500 million 5.875% Senior Notes due 2023 [Member]
USD ($)
Dec. 31, 2013
Allegheny Technologies $500 million 5.875% Senior Notes due 2023 [Member]
USD ($)
Dec. 31, 2012
Allegheny Technologies $500 million 5.875% Senior Notes due 2023 [Member]
USD ($)
Dec. 31, 2013
Allegheny Technologies $402.5 million 4.25% Convertible Senior Notes due 2014 [Member]
USD ($)
Dec. 31, 2012
Allegheny Technologies $402.5 million 4.25% Convertible Senior Notes due 2014 [Member]
USD ($)
Dec. 31, 2013
Ladish Series B 6.14% Notes due 2016 [Member]
USD ($)
Dec. 31, 2012
Ladish Series B 6.14% Notes due 2016 [Member]
USD ($)
Dec. 31, 2013
Ladish Series C 6.41% Notes due 2015 [Member]
USD ($)
Dec. 31, 2012
Ladish Series C 6.41% Notes due 2015 [Member]
USD ($)
Dec. 31, 2013
Domestic Bank Group $400 million unsecured credit agreement [Member]
USD ($)
Dec. 31, 2012
Domestic Bank Group $400 million unsecured credit agreement [Member]
USD ($)
Dec. 31, 2013
Seperate Letter of Credit Facility [Member]
USD ($)
Dec. 31, 2013
STAL Revolving Credit Facility [Member]
USD ($)
Dec. 31, 2013
STAL Revolving Credit Facility [Member]
CNY
Dec. 31, 2013
Foreign Credit Facilities [Member]
USD ($)
Dec. 31, 2013
Minimum [Member]
Domestic Bank Group $400 million unsecured credit agreement [Member]
Dec. 31, 2013
Minimum [Member]
Domestic Bank Group $400 million unsecured credit agreement [Member]
London Interbank Offered Rate (LIBOR) [Member]
Dec. 31, 2013
Maximum [Member]
Domestic Bank Group $400 million unsecured credit agreement [Member]
Dec. 31, 2013
Maximum [Member]
Domestic Bank Group $400 million unsecured credit agreement [Member]
London Interbank Offered Rate (LIBOR) [Member]
Interest Costs Incurred [Abstract]                                            
Interest expense $ 66,000,000 $ 72,400,000 $ 93,700,000                                      
Interest costs capitalized 45,700,000 24,500,000 12,100,000                                      
Interest costs paid 110,600,000 96,500,000 102,800,000                                      
Interest income 800,000 800,000 1,400,000                                      
Long-term Debt, Fiscal Year Maturity [Abstract]                                            
2014 419,900,000                                          
2015 17,300,000                                          
2016 7,400,000                                          
2017 400,000                                          
2018 200,000                                          
Debt Instrument [Line Items]                                            
Debt instrument carrying amount       500,000,000 500,000,000 0 402,500,000 402,500,000 18,200,000 [1] 24,800,000 [1] 21,100,000 [2] 32,500,000 [2]                    
Debt instrument interest rate stated percentage       5.875%     4.25% 4.25% 6.14% [1] 6.14% [1] 6.41% [2] 6.41% [2]                    
Debt instrument maturity date       Aug. 15, 2023 Aug. 15, 2023   Jun. 01, 2014 Jun. 01, 2014 May 16, 2016 [1] May 16, 2016 [1] Sep. 02, 2015 [2] Sep. 02, 2015 [2]                    
Payments of debt issuance costs 5,200,000 0 5,000,000                                      
Amortization period of debt issuance costs         10 years                                  
Line of credit maximum borrowing capacity                         400,000,000     34,000,000 205,000,000 30,000,000        
Line of credit borrowing capacity increase limit                         100,000,000                  
Maximum leverage ratio through September 30, 2013                         4.50                  
Maximum leverage ratio prior to 2013 amendment                         3.25                  
Maximum leverage ratio October 1, 2013 through December 31, 2014                         4                  
Maximum leverage ratio January 1, 2015 through March 31, 2015                         3.75                  
Maximum leverage ratio April 1, 2015 and thereafter                         3.50                  
Minimum interest coverage ratio October 1, 2013 through December 31, 2013                         1.75                  
Minimum interest coverage ratio prior to the 2013 amendment                         2                  
Minimum interest coverage ratio January 1, 2014 and thereafter                         2                  
Leverage ratio                         1.5                  
Interest coverage ratio                         7.43                  
Amount of cash on hand used to reduce the indebtness figure used in the leverage ratio calculation                         50,000,000                  
Line of credit facility amount outstanding                         0 0 32,000,000 0            
Facility fee                                   0.20% 0.18%   0.35%  
Joint venture ownership percentage                               60.00% 60.00%          
Credit facility amount used to support letters of credit                         5,000,000                  
Credit facility sublimit for letters of credit                         200,000,000                  
Variable rate spread                                       1.25%   2.50%
Convertible debt conversion rate in shares of stock (per $1,000 of notes)             23.9263                              
Number of units in convertible notes             9,630,336                              
Conversion price of convertible notes             $ 41.795                              
Repurchase Price, Percentage of Principal Amount             100.00%                              
Outstanding balance                 17,200,000   20,000,000                      
Funded debt limit maximum percent of capitalization                     60.00%                      
Interest rate as a percentage of lending rate published by People's Bank of China                               90.00% 90.00%          
Borrowing capacity                                   $ 30,000,000        
[1] Includes fair value adjustments of $1.0 million and $1.9 million at December 31, 2013 and December 31, 2012, respectively.
[2] Includes fair value adjustments of $1.1 million and $2.5 million at December 31, 2013 and December 31, 2012, respectively.