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Restructuring Costs (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($) employee | Dec. 31, 2020 USD ($) position | Dec. 31, 2019 USD ($) position
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges | $ (10.5) | $ 1,132.1 | $ 4.5
Non-cash restructuring charges | 0.0 | 1,041.5 | 0.0
Restructuring charges (credits) | (11.3) | 1,107.5 | 4.5
Severance costs |  | $ 60.5 |
Restructuring and Related Cost, Expected Number of Positions Eliminated | position |  | 1,400 |
Inventory write-down | 0.8 | $ 7.2 |
Termination benefits |  | 17.4 |
Brackenridge PA Operations |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Asset impairment charges |  | 1,032.6 |
Fair value |  | $ 354.0 |
Brackenridge PA Operations | Weighted average cost of capital | Fair Value, Inputs, Level 3 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Long-Lived Asset, Measurement Input |  | 0.093 |
Brackenridge PA Operations | Long-term growth rate | Fair Value, Inputs, Level 3 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Long-Lived Asset, Measurement Input |  | 0.02 |
Various AA&S Segment Operations |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Asset impairment charges |  | $ 8.9 |
Facility Idling |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges (credits) |  | 5.5 |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring Charges | $ 0.7 |  |
Employee Severance |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Reduction in severance related reserves, workforce | employee | 350 |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring Reserve, Beginning Balance | $ 43.4 | 4.5 | 0.0
Restructuring Charges | (12.0) | 60.5 | 4.5
Payments for Restructuring | (13.7) | (21.6) | 0.0
Restructuring Reserve, Ending Balance | 17.7 | 43.4 | $ 4.5
Other Current Liabilities [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring Reserve, Beginning Balance | 33.8 |  |
Restructuring Reserve, Ending Balance | 11.4 | 33.8 |
Other Noncurrent Liabilities [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring Reserve, Beginning Balance | 9.6 |  |
Restructuring Reserve, Ending Balance | $ 6.3 | $ 9.6 |
Flat Rolled Products |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and Related Cost, Expected Number of Positions Eliminated | position |  |  | 70

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