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Debt - Schedule of Debt (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Feb. 15, 2016 | [1] | Dec. 31, 2013
Debt Instrument [Line Items] |  |  |  |  |
Debt Issuance Costs, Net |  | $ 17.1 |  |  |
Debt issuance costs |  |  | $ (9.5) |  |
Total short-term and long-term debt |  | 1,877.0 | 1,495.7 |  |
Short-term debt and current portion of long-term debt |  | 105.1 | 3.9 |  |
Total long-term debt |  | $ 1,771.9 | $ 1,491.8 |  |
Allegheny Technologies $500 million 5.875% Senior Notes due 2023 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument issuer | [1] | Allegheny Technologies | Allegheny Technologies |  |
Debt instrument interest rate stated percentage |  |  |  | 7.875% | 5.875%
Debt instrument carrying amount | [1] | $ 500.0 | $ 500.0 |  |
Allegheny Technologies $500 million 5.95% Senior Notes due 2021 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument issuer |  | Allegheny Technologies | Allegheny Technologies |  |
Debt instrument interest rate stated percentage |  | 5.95% | 5.95% |  |
Debt instrument carrying amount |  | $ 500.0 | $ 500.0 |  |
Allegheny Technologies $350 million 9.375% Senior Notes due 2019 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument issuer |  | Allegheny Technologies | Allegheny Technologies |  |
Debt instrument interest rate stated percentage |  | 9.375% | 9.375% |  |
Debt instrument carrying amount |  | $ 350.0 | $ 350.0 |  |
Allegheny Technologies, $287.5 million Convertible Senior Notes, 4.75%, Due 2022 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument issuer |  | Allegheny Technologies |  |  |
Debt instrument interest rate stated percentage |  | 4.75% |  |  |
Debt instrument carrying amount |  | $ 287.5 | $ 0.0 |  |
Allegheny Ludlum 6.95% Debentures due 2025 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument issuer |  | Allegheny Ludlum | Allegheny Ludlum |  |
Debt instrument interest rate stated percentage |  | 6.95% | 6.95% |  |
Debt instrument carrying amount |  | $ 150.0 | $ 150.0 |  |
2017 Term Loan [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument issuer |  | Allegheny Technologies |  |  |
Debt instrument carrying amount |  | $ 100.0 | 0.0 |  |
Domestic Bank Group $400 million asset-based credit facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument carrying amount |  | 0.0 | 0.0 |  |
Industrial revenue bonds, due through 2020, and other [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument carrying amount |  | 2.2 | 3.8 |  |
Foreign credit agreements [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument carrying amount |  | $ 4.4 | $ 1.4 |  |
[1] | Bearing interest at 7.875% effective February 15, 2016.

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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