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Debt Schedule of Debt (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 | Jul. 31, 2018 | Feb. 15, 2016 | Dec. 31, 2013
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Issuance Costs, Net |  | $ 11.1 | $ 13.1 |  |  |
Total Debt |  | 1,551.9 | 1,540.7 |  |  |
Short-term debt and current portion of long-term debt |  | 16.6 | 10.1 |  |  |
Long-term debt |  | 1,535.3 | 1,530.6 |  |  |
Allegheny Technologies, Convertible Senior Notes, 4.75%, Due 2022 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, Gross |  | $ 287.5 | $ 287.5 |  |  |
Debt Instrument, Issuer |  | Allegheny Technologies |  |  |  |
Debt Instrument, Maturity Date |  | Jul. 01, 2022 | Jul. 01, 2022 |  |  |
Interest rate |  | 4.75% | 4.75% |  |  |
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% | 7.875% |  | 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 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% |  |  |
2022 Term Loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, Gross |  | $ 100.0 | $ 100.0 |  |  |
Debt Instrument, Issuer |  | Allegheny Technologies |  |  |  |
Debt Instrument, Maturity Date |  | Feb. 28, 2022 | Feb. 28, 2022 |  |  |
Interest rate |  |  |  | 5.44% |  |
Domestic Bank Group $400 million asset-based credit facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Short-term Debt |  | $ 0.0 | $ 0.0 |  |  |
Foreign credit facilities |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Short-term Debt |  | 10.0 | 6.3 |  |  |
Other |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, Gross |  | $ 15.5 | $ 10.0 |  |  |
[1] | Bearing interest at 7.875% effective February 15, 2016.

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