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Debt Schedule of Debt (Details) (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Total Debt	$ 1,538,100,000	$ 1,947,300,000
Short-term debt and current portion of long-term debt	17,400,000	419,900,000
Long-term debt	1,520,700,000	1,527,400,000
Allegheny Technologies 5.875% Notes due 2023
Debt Instrument [Line Items]
Long-term Debt, Gross	500,000,000	500,000,000
Debt Instrument, Issuer	Allegheny Technologies
Debt Instrument, Maturity Date	Aug. 15, 2023	Aug. 15, 2013
Debt Instrument, Interest Rate, Stated Percentage	5.875%	5.875%
Allegheny Technologies 5.95% Notes due 2021
Debt Instrument [Line Items]
Long-term Debt, Gross	500,000,000	500,000,000
Allegheny Technologies 4.25% Convertible Notes due 2014
Debt Instrument [Line Items]
Long-term Debt, Gross	0	402,500,000
Allegheny Technologies 9.375% Notes due 2019
Debt Instrument [Line Items]
Long-term Debt, Gross	350,000,000	350,000,000
Allegheny Ludlum 6.95% debentures due 2025
Debt Instrument [Line Items]
Long-term Debt, Gross	150,000,000	150,000,000
Debt Instrument, Interest Rate, Stated Percentage	6.95%
ATI Ladish Series B 6.14% Notes due 2016 (a)
Debt Instrument [Line Items]
Long-term Debt, Gross	12,100,000	18,200,000
Business Acquisition Purchase Price Allocation Notes Payable and L T Debt	700,000	1,000,000
ATI Ladish Series C 6.41% Notes due 2015 (b)
Debt Instrument [Line Items]
Long-term Debt, Gross	20,600,000	21,100,000
Business Acquisition Purchase Price Allocation Notes Payable and L T Debt	600,000	1,100,000
Domestic Bank Group $400 million unsecured credit facility
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	400,000,000
Long-term Debt, Gross	0	0
Foreign credit facilities
Debt Instrument [Line Items]
Long-term Debt, Gross	0	0
Industrial revenue bonds, due through 2020, and other
Debt Instrument [Line Items]
Long-term Debt, Gross	5,400,000	5,500,000
ATI Ladish Series B 6.14% Notes due 2016 (a)
Debt Instrument [Line Items]
Debt Instrument, Issuer	ATI Ladish
Debt Instrument, Maturity Date	May 16, 2016	May 16, 2016
Debt Instrument, Interest Rate, Stated Percentage	6.14%	6.14%
ATI Ladish Series C 6.41% Notes due 2015 (b)
Debt Instrument [Line Items]
Debt Instrument, Issuer	ATI Ladish
Debt Instrument, Maturity Date	Sep. 02, 2015	Sep. 02, 2015
Debt Instrument, Interest Rate, Stated Percentage	6.41%	6.41%
Allegheny Technologies 5.95% Notes due 2021
Debt Instrument [Line Items]
Debt Instrument, Issuer	Allegheny Technologies
Debt Instrument, Maturity Date	Jan. 15, 2021	Jan. 15, 2021
Debt Instrument, Interest Rate, Stated Percentage	5.95%	5.95%
Allegheny Technologies 4.25% Convertible Notes due 2014
Debt Instrument [Line Items]
Debt Instrument, Issuer		Allegheny Technologies
Debt Instrument, Maturity Date		Jun. 01, 2014
Debt Instrument, Interest Rate, Stated Percentage		4.25%
Industrial revenue bonds, due through 2020, and other
Debt Instrument [Line Items]
Debt Instrument, Maturity Date Range, End	Jan. 01, 2020	Jan. 01, 2020
Allegheny Ludlum 6.95% debentures due 2025
Debt Instrument [Line Items]
Debt Instrument, Issuer	Allegheny Ludlum
Debt Instrument, Maturity Date	Dec. 15, 2025	Dec. 15, 2025
Debt Instrument, Interest Rate, Stated Percentage		6.95%
Allegheny Technologies 9.375% Notes due 2019
Debt Instrument [Line Items]
Debt Instrument, Issuer	Allegheny Technologies
Debt Instrument, Maturity Date	Jun. 01, 2019	Jun. 01, 2019
Debt Instrument, Interest Rate, Stated Percentage	9.375%	9.375%
Domestic Bank Group $400 million unsecured credit facility
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 400,000,000

X

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The amount of acquisition cost of a business combination allocated to notes payables and long-term debt above or below the face amount of the debt assumed from the acquired entity.

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Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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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.

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

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Identification of the contractual issuer of the debt instrument (for example, a subsidiary of the reporting entity).

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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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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