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Debt - Schedule of Debt (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2016 | Feb. 15, 2016 | [1] | Dec. 31, 2013
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Issuance Costs, Net |  | $ 12.3 | $ 10.4 |  |  |
Total short-term and long-term debt |  | 1,398.9 | 1,542.1 |  |  |
Short-term debt and current portion of long-term debt |  | 11.5 | 6.6 |  |  |
Total long-term debt |  | $ 1,387.4 | $ 1,535.5 |  |  |
Allegheny Technologies $500 million 5.875% Senior Notes due 2023 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument issuer | [1] | Allegheny Technologies | Allegheny Technologies |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 7.875% | 5.875%
Debt instrument carrying amount | [1] | $ 500.0 | $ 500.0 |  |  |
Allegheny Technologies $500 million 5.95% Senior Notes due 2021 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument issuer |  |  | Allegheny Technologies |  |  |
Debt instrument interest rate stated percentage |  |  | 5.95% |  |  |
Debt instrument carrying amount |  | $ 0.0 | $ 500.0 |  |  |
Allegheny Technologies $350 million 5.875% Senior Notes due 2027 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument issuer |  | Allegheny Technologies |  |  |  |
Debt instrument interest rate stated percentage |  | 5.875% |  |  |  |
Debt instrument carrying amount |  | $ 350.0 | $ 0.0 |  |  |
Allegheny Technologies $350 million 9.375% Senior Notes due 2019 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  | 9.375% |  |
Debt instrument carrying amount |  |  |  | $ 350.0 |  |
Allegheny Technologies, $287.5 million Convertible Senior Notes, 4.75%, Due 2022 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument issuer |  | Allegheny Technologies | Allegheny Technologies |  |  |
Debt instrument interest rate stated percentage |  | 4.75% | 4.75% |  |  |
Debt instrument carrying amount |  | $ 287.5 | $ 287.5 |  |  |
Allegheny Ludlum 6.95% Debentures due 2025 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument issuer |  | Allegheny Ludlum | Allegheny Ludlum |  |  |
Debt instrument interest rate stated percentage |  | 6.95% | 6.95% |  |  |
Debt instrument carrying amount |  | $ 150.0 | $ 150.0 |  |  |
Term Loan due 2024 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument issuer |  | Allegheny Technologies | Allegheny Technologies |  |  |
Debt instrument interest rate stated percentage |  | 4.21% |  |  |  |
Debt instrument carrying amount |  | $ 100.0 | $ 100.0 |  |  |
Domestic Bank Group $500 million asset-based credit facility [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument carrying amount |  | 0.0 | 0.0 |  |  |
Finance leases and other [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument carrying amount |  | 18.8 | 15.0 |  |  |
Foreign credit agreements [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument carrying amount |  | $ 4.9 | $ 0.0 |  |  |
Maximum | Allegheny Technologies $500 million 5.875% Senior Notes due 2023 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  | 7.875% |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Term Loan due 2024 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Variable rate spread |  | 2.00% |  |  |  |
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum | Domestic Bank Group $500 million asset-based credit facility [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Variable rate spread |  | 1.25% |  |  |  |
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum | Domestic Bank Group $500 million asset-based credit facility [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Variable rate spread |  | 1.75% |  |  |  |
[1] | Bearing interest at 7.875% effective February 15, 2016.

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