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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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