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Debt - Schedule of Debt (Details) (USD $)
 0 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Domestic Bank Group $400 million unsecured credit agreement [Member]
Dec. 31, 2012
Domestic Bank Group $400 million unsecured credit agreement [Member]
Jul. 12, 2013
Allegheny Technologies $500 million 5.875% Senior Notes due 2023 [Member]
Dec. 31, 2013
Allegheny Technologies $500 million 5.875% Senior Notes due 2023 [Member]
Dec. 31, 2012
Allegheny Technologies $500 million 5.875% Senior Notes due 2023 [Member]
Dec. 31, 2013
Allegheny Technologies $500 million 5.95% Senior Notes due 2021 [Member]
Dec. 31, 2012
Allegheny Technologies $500 million 5.95% Senior Notes due 2021 [Member]
Dec. 31, 2013
Allegheny Technologies $402.5 million 4.25% Convertible Senior Notes due 2014 [Member]
Dec. 31, 2012
Allegheny Technologies $402.5 million 4.25% Convertible Senior Notes due 2014 [Member]
Dec. 31, 2013
Allegheny Technologies $350 million 9.375% Senior Notes due 2019 [Member]
Dec. 31, 2012
Allegheny Technologies $350 million 9.375% Senior Notes due 2019 [Member]
Dec. 31, 2013
Allegheny Ludlum 6.95% Debentures due 2025 [Member]
Dec. 31, 2012
Allegheny Ludlum 6.95% Debentures due 2025 [Member]
Dec. 31, 2013
Ladish Series B 6.14% Notes due 2016 [Member]
Dec. 31, 2012
Ladish Series B 6.14% Notes due 2016 [Member]
Dec. 31, 2013
Ladish Series C 6.41% Notes due 2015 [Member]
Dec. 31, 2012
Ladish Series C 6.41% Notes due 2015 [Member]
Dec. 31, 2013
Foreign credit agreements [Member]
Dec. 31, 2012
Foreign credit agreements [Member]
Dec. 31, 2013
Industrial revenue bonds, due through 2020, and other [Member]
Dec. 31, 2012
Industrial revenue bonds, due through 2020, and other [Member]
Debt Instrument [Line Items]                                              
Debt instrument issuer           Allegheny Technologies   Allegheny Technologies Allegheny Technologies Allegheny Technologies Allegheny Technologies Allegheny Technologies Allegheny Technologies Allegheny Ludlum Allegheny Ludlum ATI Ladish, LLC [1] ATI Ladish, LLC [1] ATI Ladish, LLC [2] ATI Ladish, LLC [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]        
Debt instrument interest rate stated percentage         5.875%     5.95% 5.95% 4.25% 4.25% 9.375% 9.375% 6.95% 6.95% 6.14% [1] 6.14% [1] 6.41% [2] 6.41% [2]        
Debt instrument carrying amount         $ 500,000,000 $ 500,000,000 $ 0 $ 500,000,000 $ 500,000,000 $ 402,500,000 $ 402,500,000 $ 350,000,000 $ 350,000,000 $ 150,000,000 $ 150,000,000 $ 18,200,000 [1] $ 24,800,000 [1] $ 21,100,000 [2] $ 32,500,000 [2] $ 0 $ 14,200,000 $ 5,500,000 $ 6,100,000
Line of credit facility amount outstanding     0 0                                      
Total short-term and long-term debt 1,947,300,000 1,480,100,000                                          
Short-term debt and current portion of long-term debt 419,900,000 17,100,000                                          
Total long-term debt 1,527,400,000 1,463,000,000                                          
Business acquisition fair value adjustment of debt assumed                               $ 1,000,000 $ 1,900,000 $ 1,100,000 $ 2,500,000        
[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.