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Debt Schedule of Debt (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015 | Feb. 15, 2016 | Dec. 31, 2013
Debt Instrument [Line Items] |  |  |  |  |
Deferred Finance Costs, Noncurrent, Net |  | $ (9.1) | $ (9.5) |  |
Total Debt |  | 1,649.2 | 1,495.7 |  |
Short-term debt and current portion of long-term debt |  | 156.5 | 3.9 |  |
Long-term debt |  | 1,492.7 | 1,491.8 |  |
Allegheny Technologies 5.875% Notes due 2023 (a) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt, Gross | [1] | $ 500.0 | $ 500.0 |  |
Debt Instrument, Issuer |  | Allegheny Technologies |  |  |
Debt Instrument, Maturity Date |  | Aug. 15, 2023 | Aug. 15, 2023 |  |
Interest rate |  | 7.875% | 7.625% | 7.875% | 5.875%
Allegheny Technologies 5.95% Notes due 2021 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt, Gross |  | $ 500.0 | $ 500.0 |  |
Debt Instrument, Issuer |  | Allegheny Technologies |  |  |
Debt Instrument, Maturity Date |  | Jan. 15, 2021 | Jan. 15, 2021 |  |
Interest rate |  | 5.95% | 5.95% |  |
Allegheny Technologies 9.375% Notes due 2019 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt, Gross |  | $ 350.0 | $ 350.0 |  |
Debt Instrument, Issuer |  | Allegheny Technologies |  |  |
Debt Instrument, Maturity Date |  | Jun. 01, 2019 | Jun. 01, 2019 |  |
Interest rate |  | 9.375% | 9.375% |  |
Allegheny Ludlum 6.95% debentures due 2025 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt, Gross |  | $ 150.0 | $ 150.0 |  |
Debt Instrument, Issuer |  | Allegheny Ludlum |  |  |
Debt Instrument, Maturity Date |  | Dec. 15, 2025 | Dec. 15, 2025 |  |
Interest rate |  | 6.95% | 6.95% |  |
Domestic Bank Group $400 million asset-based credit facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt, Gross |  | $ 150.0 | $ 0.0 |  |
Foreign credit facilities |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt, Gross |  | 3.7 | 1.4 |  |
Industrial revenue bonds, due through 2020, and other |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt, Gross |  | $ 4.6 | $ 3.8 |  |
Debt Instrument, Maturity Date Range, End |  | Jan. 01, 2020 | Jan. 01, 2020 |  |
[1] | Bearing interest at 7.875% effective February 15, 2016.

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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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