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Debt Narrative (Details)		1 Months Ended	3 Months Ended
		Mar. 31, 2017 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)	Feb. 15, 2016	Dec. 31, 2013
Debt Instrument [Line Items]
Defined benefit plan contributions made		$ 135,000,000
Allegheny Technologies 5.875% Notes due 2023 (a)
Debt Instrument [Line Items]
Interest rate		7.875%	7.875%			7.875%	5.875%
Outstanding borrowings	[1]	$ 500,000,000	$ 500,000,000		$ 500,000,000
Domestic Bank Group $400 million asset-based credit facility
Debt Instrument [Line Items]
Short-term Debt		60,000,000	60,000,000		0
Amount utilized to support the issuance of letters of credit		42,900,000	42,900,000
Average borrowings during period			$ 4,000,000	$ 188,000,000
Interest rate during period			3.43%	1.685%
Domestic Bank Group $400 million asset-based credit facility | Revolving credit facility
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 400,000,000	$ 400,000,000
Minimum fixed charge coverage ratio allowed in event of default		1	1
Percentage of borrowing capacity unavailable due to fixed charge coverage ratio covenant		12.50%	12.50%
Borrowing capacity unavailable due to fixed charge coverage ratio covenant		$ 40,000,000	$ 40,000,000
Remaining borrowing capacity unavailable due to fixed charge coverage ratio covenant		62,500,000	62,500,000
Minimum required liquidity prior to maturity of 9.375% Senior Notes due 2019		500,000,000	$ 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)			2.00%
Domestic Bank Group $400 million asset-based credit facility | Revolving credit facility | Minimum | Base rate borrowings
Debt Instrument [Line Items]
Variable interest rate (percentage)			1.00%
Domestic Bank Group $400 million asset-based credit facility | Revolving credit facility | Maximum | LIBOR based borrowings
Debt Instrument [Line Items]
Variable interest rate (percentage)			2.50%
Domestic Bank Group $400 million asset-based credit facility | Revolving credit facility | Maximum | Base rate borrowings
Debt Instrument [Line Items]
Variable interest rate (percentage)			1.50%
Domestic Bank Group $400 million asset-based credit facility | Letter of credit sub-facility
Debt Instrument [Line Items]
Maximum borrowing capacity		200,000,000	$ 200,000,000
2017 Term Loan
Debt Instrument [Line Items]
Outstanding borrowings		$ 100,000,000	$ 100,000,000		$ 100,000,000
2017 Term Loan | LIBOR based borrowings
Debt Instrument [Line Items]
Variable interest rate (percentage)			3.50%
Allegheny Technologies, Convertible Senior Notes, 4.75%, Due 2022 [Member]
Debt Instrument [Line Items]
Interest rate		4.75%	4.75%		4.75%
Outstanding borrowings		$ 287,500,000	$ 287,500,000		$ 287,500,000
[1] Bearing interest at 7.875% effective February 15, 2016.

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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.

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Contractual interest rate for funds borrowed, under the debt agreement.

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