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Debt Narrative (Details)		1 Months Ended	3 Months Ended	6 Months Ended
		Mar. 31, 2017 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Feb. 15, 2016	Dec. 31, 2013
Debt Instrument [Line Items]
Payments of Debt Issuance Costs				$ 800,000	$ 10,400,000
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%	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			45,100,000	45,100,000
Average borrowings during period				$ 36,000,000	$ 164,000,000
Interest rate during period				3.376%	1.757%
Domestic Bank Group $400 million asset-based credit facility | Revolving credit facility
Debt Instrument [Line Items]
Payments of Debt Issuance Costs			1,000,000
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			10.00%	10.00%
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			$ 50,000,000	50,000,000
Minimum required liquidity number of days prior to maturity of Senior Notes			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)			1.75%
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)			2.25%
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
2022 Term Loan [Member]
Debt Instrument [Line Items]
Payments of Debt Issuance Costs			800,000
Minimum prepayment increments allowed			50,000,000
Outstanding borrowings			$ 100,000,000	$ 100,000,000		$ 100,000,000
2022 Term Loan [Member] | LIBOR based borrowings
Debt Instrument [Line Items]
Variable interest rate (percentage)			3.00%
Allegheny Technologies 9.375% Notes due 2019
Debt Instrument [Line Items]
Interest rate			9.375%	9.375%		9.375%
Outstanding borrowings			$ 350,000,000	$ 350,000,000		$ 350,000,000
Allegheny Technologies 9.375% Notes due 2019 | Revolving credit facility
Debt Instrument [Line Items]
Minimum required liquidity prior to maturity of Senior Notes			$ 500,000,000	$ 500,000,000
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
Allegheny Technologies 5.95% Notes due 2021
Debt Instrument [Line Items]
Interest rate			5.95%	5.95%		5.95%
Outstanding borrowings			$ 500,000,000	$ 500,000,000		$ 500,000,000
Allegheny Technologies 5.95% Notes due 2021 | Revolving credit facility
Debt Instrument [Line Items]
Minimum required liquidity prior to maturity of Senior Notes			$ 700,000,000	$ 700,000,000
[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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The effective interest rate during the reporting period.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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