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Debt Schedule of Debt (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
		Mar. 31, 2016	Dec. 31, 2015	Feb. 15, 2016	Dec. 31, 2013
Debt Instrument [Line Items]
Deferred Finance Costs, Noncurrent, Net		$ (9.1)	$ (9.5)
Total Debt		1,649.2	1,495.7
Short-term debt and current portion of long-term debt		156.5	3.9
Long-term debt		1,492.7	1,491.8
Allegheny Technologies 5.875% Notes due 2023 (a)
Debt Instrument [Line Items]
Long-term Debt, Gross	[1]	$ 500.0	$ 500.0
Debt Instrument, Issuer		Allegheny Technologies
Debt Instrument, Maturity Date		Aug. 15, 2023	Aug. 15, 2023
Interest rate		7.875%	7.625%	7.875%	5.875%
Allegheny Technologies 5.95% Notes due 2021
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 500.0	$ 500.0
Debt Instrument, Issuer		Allegheny Technologies
Debt Instrument, Maturity Date		Jan. 15, 2021	Jan. 15, 2021
Interest rate		5.95%	5.95%
Allegheny Technologies 9.375% Notes due 2019
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 350.0	$ 350.0
Debt Instrument, Issuer		Allegheny Technologies
Debt Instrument, Maturity Date		Jun. 01, 2019	Jun. 01, 2019
Interest rate		9.375%	9.375%
Allegheny Ludlum 6.95% debentures due 2025
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 150.0	$ 150.0
Debt Instrument, Issuer		Allegheny Ludlum
Debt Instrument, Maturity Date		Dec. 15, 2025	Dec. 15, 2025
Interest rate		6.95%	6.95%
Domestic Bank Group $400 million asset-based credit facility
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 150.0	$ 0.0
Foreign credit facilities
Debt Instrument [Line Items]
Long-term Debt, Gross		3.7	1.4
Industrial revenue bonds, due through 2020, and other
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 4.6	$ 3.8
Debt Instrument, Maturity Date Range, End		Jan. 01, 2020	Jan. 01, 2020
[1] Bearing interest at 7.875% effective February 15, 2016.

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total of both long-term debt, short-term debt and current portion of long-term debt

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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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-SubTopic 10
-Section S99
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