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Selected Quarterly Financial Data (Unaudited) - Narrative (Details) - USD ($) shares in Millions, $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 07, 2017 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Unusual Or Infrequent Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring costs |  |  |  |  |  |  |  |  |  | $ 48.8 |
Income taxes (above) below normal |  |  |  | $ (32.4) |  | $ (11.4) | $ 12.0 |  |  |  |
Federal tax rate |  |  |  |  |  |  |  |  |  | 35.00% |
NRV charge |  |  |  |  |  |  |  |  | $ (54.0) | $ (39.9) | $ 131.5
Deferred tax asset valuation allowance charge |  |  |  | (22.5) | $ 173.1 |  |  |  |  |  |
Impairment of goodwill |  |  | $ 114.4 |  |  |  |  |  | 114.4 | 0.0 | 126.6
Impairment of goodwill net of tax |  |  | $ 113.6 |  |  |  |  |  |  |  |
Debt extinguishment charge |  | $ 37.0 |  |  |  |  |  |  | 37.0 | 0.0 | 0.0
Change in federal tax rate and law change |  | (4.1) |  |  |  |  |  |  | (4.1) | 0.0 | 0.0
Shares issued | 17 |  |  |  |  |  |  |  |  |  |
Flat Rolled Products [Member] |  |  |  |  |  |  |  |  |  |  |
Unusual Or Infrequent Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of goodwill |  |  |  |  |  |  |  | $ 126.6 |  |  |
High Performance Materials & Components and Corporate [Member] |  |  |  |  |  |  |  |  |  |  |
Unusual Or Infrequent Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Severance and termination benefit costs |  |  |  |  |  |  |  | 6.3 |  |  |
Employee Severance [Member] | Flat Rolled Products [Member] |  |  |  |  |  |  |  |  |  |  |
Unusual Or Infrequent Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring costs |  |  |  |  |  |  | 9.0 |  |  |  |
Restructuring costs net of tax |  |  |  |  |  |  | 6.7 |  |  |  |
Work Stoppage and Return to Work [Member] | Flat Rolled Products [Member] |  |  |  |  |  |  |  |  |  |  |
Unusual Or Infrequent Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring costs |  |  |  |  |  | 22.4 | 26.4 |  |  |  |
Restructuring costs net of tax |  |  |  |  |  | $ 8.4 | $ 19.7 |  |  |  |
Long-lived asset impairment [Member] |  |  |  |  |  |  |  |  |  |  |
Unusual Or Infrequent Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring costs |  |  |  |  | 471.3 |  |  |  |  |  |
Restructuring costs net of tax |  |  |  |  | 310.3 |  |  |  |  |  |
Asset Impairment Charges |  |  |  |  |  |  |  |  |  |  | $ 54.5
Facility Closing [Member] |  |  |  |  |  |  |  |  |  |  |
Unusual Or Infrequent Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring costs |  |  |  | 15.4 | 16.3 |  |  |  |  | 28.0 |
Restructuring costs net of tax |  |  |  | 10.0 | 10.7 |  |  |  |  |  |
Employee benefit costs [Member] |  |  |  |  |  |  |  |  |  |  |
Unusual Or Infrequent Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring costs |  |  |  | 13.2 |  |  |  |  |  | 20.8 |
Restructuring costs net of tax |  |  |  | 8.6 |  |  |  |  |  |  |
Inventory Valuation Reserve [Member] | Titanium sponge inventory [Member] |  |  |  |  |  |  |  |  |  |  |
Unusual Or Infrequent Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Inventory valuation charges |  |  |  |  | 11.3 |  |  |  |  |  |
Inventory valuation charges net of tax |  |  |  |  | $ 7.4 |  |  |  |  |  |
Inventory Valuation Reserve [Member] | Non-PQ grade titanium sponge [Member] |  |  |  |  |  |  |  |  |  |  |
Unusual Or Infrequent Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Inventory valuation charges |  |  |  |  |  |  |  | $ 25.4 |  |  |
Allegheny Technologies $350 million 9.375% Senior Notes due 2019 [Member] |  |  |  |  |  |  |  |  |  |  |
Unusual Or Infrequent Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument carrying amount |  | $ 0.0 |  | $ 350.0 |  |  |  |  | $ 0.0 | $ 350.0 |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 9.375% |  |  |  |  |  | 9.375% |

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