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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 |
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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.

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- Definition Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 31 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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