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Debt Narrative (Details) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2016 USD ($) | Feb. 15, 2016 | Dec. 31, 2015 USD ($) | Dec. 31, 2013
Allegheny Technologies 5.875% Notes due 2023 (a) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate |  | 7.875% | 7.875% | 7.625% | 5.875%
Additional annual interest expense to be incurred |  | $ 1,300,000 |  |  |
Outstanding borrowings | [1] | 500,000,000 |  | $ 500,000,000 |
Domestic Bank Group $400 million asset-based credit facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Outstanding borrowings |  | 150,000,000 |  | $ 0 |
Amount utilized to support the issuance of letters of credit |  | 9,800,000 |  |  |
Average borrowings during period |  | $ 188,000,000 |  |  |
Interest rate during period |  | 1.685% |  |  |
Domestic Bank Group $400 million asset-based credit facility | Revolving credit facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity |  | $ 400,000,000 |  |  |
Minimum fixed charge coverage ratio allowed in event of default |  | 1 |  |  |
Minimum remaining borrowing capacity as a percent of maximum borrowing capacity |  | 10.00% |  |  |
Minimum remaining borrowing capacity |  | $ 40,000,000 |  |  |
Minimum required liquidity prior to maturity of 9.375% Senior Notes due 2019 |  | $ 500,000,000 |  |  |
Minimum required liquidity number of days prior to maturity of 9.375% Senior Notes due 2019 |  | 91 days |  |  |
Domestic Bank Group $400 million asset-based credit facility | Revolving credit facility | Minimum | LIBOR based borrowings |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Variable interest rate (percentage) |  | 1.25% |  |  |
Domestic Bank Group $400 million asset-based credit facility | Revolving credit facility | Minimum | Base rate borrowings |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Variable interest rate (percentage) |  | 0.25% |  |  |
Domestic Bank Group $400 million asset-based credit facility | Revolving credit facility | Maximum | LIBOR based borrowings |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Variable interest rate (percentage) |  | 1.75% |  |  |
Domestic Bank Group $400 million asset-based credit facility | Revolving credit facility | Maximum | Base rate borrowings |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Variable interest rate (percentage) |  | 0.75% |  |  |
Domestic Bank Group $400 million asset-based credit facility | Letter of credit sub-facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity |  | $ 200,000,000 |  |  |
Seperateletter of Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Letters of credit outstanding |  | $ 32,000,000 |  |  |
[1] | Bearing interest at 7.875% effective February 15, 2016.

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