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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, 2022 | Dec. 31, 2022 USD ($) segment item | Dec. 31, 2021 USD ($) | Dec. 31, 2020
Segment Reporting Information |  |  |  |
Number of reportable segments | segment |  | 3 |  |
Workforce represented by collective bargaining agreements (as a percent) |  | 5.00% |  |
Number of locations under collective bargaining arrangements | item |  | 6 |  |
Redeemable noncontrolling interests |  | $ 181,503 | $ 211,414 |
Steel Operations |  |  |  |
Segment Reporting Information |  |  |  |
Percentage of external net sales |  | 65.00% | 72.00% | 74.00%
Metals Recycling Operations |  |  |  |
Segment Reporting Information |  |  |  |
Percentage of external net sales |  | 10.00% | 12.00% | 11.00%
Steel Fabrication Operations |  |  |  |
Segment Reporting Information |  |  |  |
Percentage of external net sales |  | 19.00% | 10.00% | 9.00%
United Steel Supply, LLC | Steel Operations |  |  |  |
Segment Reporting Information |  |  |  |
Noncontrolling interest, ownership percentage | 87.50% |  |  |
Mesabi Nugget |  |  |  |
Segment Reporting Information |  |  |  |
Noncontrolling interest, ownership percentage |  | 85.00% | 85.00% |
Redeemable noncontrolling interests |  | $ 111,200 | $ 111,200 |

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