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Description of the Business and Significant Accounting Policies (Description of the Business) (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Apr. 01, 2023
Sep. 30, 2023
USD ($)
Sep. 30, 2022
Sep. 30, 2023
USD ($)
segment
Sep. 30, 2022
Dec. 31, 2022
USD ($)
Segment Reporting Information            
Number of reportable segments | segment       3    
Redeemable noncontrolling interests   $ 171,212   $ 171,212   $ 181,503
United Steel Supply, LLC            
Segment Reporting Information            
Acquisition of interest (as a percent) 2.50%          
Percentage of voting equity interests remaining available 10.00%          
United Steel Supply, LLC            
Segment Reporting Information            
Noncontrolling interest, ownership percentage 90.00%          
Steel Operations            
Segment Reporting Information            
Percentage of external net sales   68.00% 66.00% 66.00% 67.00%  
Metals Recycling Operations            
Segment Reporting Information            
Percentage of external net sales   11.00% 8.00% 12.00% 10.00%  
Steel Fabrication Operations            
Segment Reporting Information            
Percentage of external net sales   14.00% 20.00% 15.00% 18.00%  
United Steel Supply, LLC            
Segment Reporting Information            
Noncontrolling interest, ownership percentage 90.00%         87.50%
Redeemable noncontrolling interests   $ 60,000   $ 60,000   $ 70,300
Mesabi Nugget            
Segment Reporting Information            
Noncontrolling interest, ownership percentage       85.50%   85.50%
Redeemable noncontrolling interests   $ 111,200   $ 111,200   $ 111,200