v3.25.2
Segment Information - Results (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Segment Reporting Information          
Net sales $ 4,565,123 $ 4,632,634 $ 8,934,318 $ 9,326,637  
Costs of goods sold 3,946,655 3,857,797 7,829,306 7,571,002  
Other segment items 235,613 215,714 447,013 445,537  
Operating income (loss) 382,855 559,123 657,999 1,310,098  
Interest expense, net of capitalized interest 17,381 12,719 29,512 24,697  
Other (income) expense, net (22,392) (18,708) (40,033) (45,492)  
Income before income taxes 387,866 565,112 668,520 1,330,893  
Depreciation and amortization 132,865 117,053 266,621 232,305  
Capital expenditures 288,331 419,166 593,837 793,476  
Total Assets 15,548,638   15,548,638   $ 14,935,233
U.S.          
Segment Reporting Information          
Net sales 4,292,462 4,242,936 8,334,382 8,521,424  
Non-U.S.          
Segment Reporting Information          
Net sales 272,661 389,698 599,936 805,213  
Operating Segment | Steel Operations          
Segment Reporting Information          
Net sales 3,384,129 3,247,962 6,538,559 6,762,490  
Costs of goods sold 2,945,794 2,756,599 5,816,292 5,546,810  
Other segment items 57,241 52,743 112,311 106,129  
Operating income (loss) 381,094 438,620 609,956 1,109,551  
Depreciation and amortization 97,377 87,497 196,307 175,004  
Capital expenditures 76,072 131,662 168,079 227,495  
Total Assets 8,967,541   8,967,541    
Operating Segment | Steel Operations | U.S.          
Segment Reporting Information          
Net sales 3,154,477 2,937,985 6,059,017 6,071,595  
Operating Segment | Steel Operations | Non-U.S.          
Segment Reporting Information          
Net sales 121,074 194,247 283,550 426,874  
Operating Segment | Steel Operations | Other segments          
Segment Reporting Information          
Net sales 108,578 115,730 195,992 264,021  
Operating Segment | Metals Recycling Operations          
Segment Reporting Information          
Net sales 1,162,153 1,109,676 2,234,660 2,151,369  
Costs of goods sold 1,113,549 1,053,939 2,133,693 2,047,201  
Other segment items 27,314 32,898 53,967 68,577  
Operating income (loss) 21,290 22,839 47,000 35,591  
Depreciation and amortization 15,881 18,202 30,851 35,465  
Capital expenditures 26,873 14,338 54,053 45,058  
Total Assets 1,473,372   1,473,372    
Operating Segment | Metals Recycling Operations | U.S.          
Segment Reporting Information          
Net sales 375,526 324,666 747,402 654,510  
Operating Segment | Metals Recycling Operations | Non-U.S.          
Segment Reporting Information          
Net sales 147,195 192,501 310,214 369,927  
Operating Segment | Metals Recycling Operations | Other segments          
Segment Reporting Information          
Net sales 639,432 592,509 1,177,044 1,126,932  
Operating Segment | Steel Fabrication Operations          
Segment Reporting Information          
Net sales 340,672 473,736 693,135 925,499  
Costs of goods sold 220,902 269,479 432,730 519,020  
Other segment items 26,656 23,517 50,545 47,399  
Operating income (loss) 93,114 180,740 209,860 359,080  
Depreciation and amortization 3,250 2,777 6,206 5,459  
Capital expenditures 3,283 7,709 8,527 13,145  
Total Assets 620,394   620,394    
Operating Segment | Steel Fabrication Operations | U.S.          
Segment Reporting Information          
Net sales 340,605 472,790 692,464 918,886  
Operating Segment | Steel Fabrication Operations | Non-U.S.          
Segment Reporting Information          
Net sales 43 42 491 1,125  
Operating Segment | Steel Fabrication Operations | Other segments          
Segment Reporting Information          
Net sales 24 904 180 5,488  
Operating Segment | Aluminum Operations          
Segment Reporting Information          
Net sales 93,567 81,804 194,214 153,960  
Costs of goods sold 87,849 75,661 179,320 140,237  
Other segment items 46,345 20,005 84,256 35,140  
Operating income (loss) (40,627) (13,862) (69,362) (21,417)  
Depreciation and amortization 2,840 1,732 5,487 2,959  
Capital expenditures 210,534 274,126 419,125 512,598  
Total Assets 3,394,694   3,394,694    
Operating Segment | Aluminum Operations | U.S.          
Segment Reporting Information          
Net sales 65,632 68,031 132,208 129,110  
Operating Segment | Aluminum Operations | Non-U.S.          
Segment Reporting Information          
Net sales   1,234   2,358  
Operating Segment | Aluminum Operations | Other segments          
Segment Reporting Information          
Net sales 27,935 12,539 62,006 22,492  
Operating Segment | Other          
Segment Reporting Information          
Net sales 361,436 441,138 709,837 752,252  
Costs of goods sold 348,666 428,151 695,254 735,071  
Other segment items 78,429 86,922 146,675 188,988  
Operating income (loss) (65,659) (73,935) (132,092) (171,807)  
Depreciation and amortization 13,517 6,845 27,770 13,418  
Capital expenditures 6,218 14,095 11,713 17,944  
Total Assets 3,853,868   3,853,868    
Operating Segment | Other | U.S.          
Segment Reporting Information          
Net sales 356,222 439,464 703,291 747,323  
Operating Segment | Other | Non-U.S.          
Segment Reporting Information          
Net sales 4,349 1,674 5,681 4,929  
Operating Segment | Other | Other segments          
Segment Reporting Information          
Net sales 865   865    
Eliminations          
Segment Reporting Information          
Net sales (776,834) (721,682) (1,436,087) (1,418,933)  
Costs of goods sold (770,105) (726,032) (1,427,983) (1,417,337)  
Other segment items (372) (371) (741) (696)  
Operating income (loss) (6,357) 4,721 (7,363) (900)  
Capital expenditures (34,649) (22,764) (67,660) (22,764)  
Total Assets (2,761,231)   (2,761,231)    
Eliminations | Other segments          
Segment Reporting Information          
Net sales $ (776,834) $ (721,682) $ (1,436,087) $ (1,418,933)