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Description of the Business and Summary of Significant Accounting Policies - Description of the Business (Details) $ in Thousands |  | 12 Months Ended
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Apr. 01, 2023 | Dec. 31, 2024 USD ($) state item segment | Dec. 31, 2023 USD ($)
Segment Reporting Information |  |  |
Number of reportable segments | segment |  | 4 |
Workforce represented by collective bargaining agreements (as a percent) |  | 5.00% |
Number of locations under collective bargaining arrangements | state |  | 4 |
Percentage of workforce subject to collective bargaining arrangements expiring during the year |  | 0.50% |
Number of locations subject to collective bargaining agreements expiring | state |  | 1 |
Redeemable noncontrolling interests |  | $ 171,212 | $ 171,212
United Steel Supply, LLC |  |  |
Segment Reporting Information |  |  |
Noncontrolling interest, ownership percentage | 90.00% | 90.00% | 90.00%
Redeemable noncontrolling interests |  | $ 60,000 | $ 60,000
United Steel Supply, LLC | Steel Operations |  |  |
Segment Reporting Information |  |  |
Noncontrolling interest, ownership percentage | 90.00% |  |
SDI Biocarbon Solutions |  |  |
Segment Reporting Information |  |  |
Noncontrolling interest, ownership percentage |  | 75.00% |
Mesabi Nugget |  |  |
Segment Reporting Information |  |  |
Noncontrolling interest, ownership percentage |  | 86.00% | 86.00%
Redeemable noncontrolling interests |  | $ 111,200 | $ 111,200
Unity Aluminum, Inc | Aluminum Operations |  |  |
Segment Reporting Information |  |  |
Number Of Satellite Recycled Aluminum Slab Centers | item |  | 2 |
Noncontrolling interest, ownership percentage |  | 94.40% |

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