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Segment Information - Results (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Segment Reporting Information          
Net sales $ 4,828,215 $ 4,341,615 $ 13,762,533 $ 13,668,252  
Costs of goods sold 4,070,335 3,736,398 11,899,641 11,307,400  
Other segment items 250,123 209,780 697,136 655,317  
Operating income (loss) 507,757 395,437 1,165,756 1,705,535  
Interest expense, net of capitalized interest 13,573 17,071 43,085 41,768  
Other (income) expense, net (19,662) (29,659) (59,695) (75,151)  
Income before income taxes 513,846 408,025 1,182,366 1,738,918  
Depreciation and amortization 138,487 121,052 405,108 353,357  
Capital expenditures 165,692 621,355 759,529 1,414,831  
Total Assets 15,965,030   15,965,030   $ 14,935,233
U.S.          
Segment Reporting Information          
Net sales 4,507,049 3,989,100 12,841,431 12,510,524  
Non-U.S.          
Segment Reporting Information          
Net sales 321,166 352,515 921,102 1,157,728  
Operating Segment | Steel Operations          
Segment Reporting Information          
Net sales 3,650,856 3,024,008 10,189,415 9,786,498  
Costs of goods sold 3,095,740 2,665,655 8,912,032 8,212,465  
Other segment items 58,324 57,099 170,635 163,228  
Operating income (loss) 496,792 301,254 1,106,748 1,410,805  
Depreciation and amortization 101,913 91,114 298,220 266,118  
Capital expenditures 76,113 121,037 244,192 348,532  
Total Assets 8,795,670   8,795,670    
Operating Segment | Steel Operations | U.S.          
Segment Reporting Information          
Net sales 3,380,992 2,745,491 9,440,009 8,817,086  
Operating Segment | Steel Operations | Non-U.S.          
Segment Reporting Information          
Net sales 157,052 171,530 440,602 598,404  
Operating Segment | Steel Operations | Other segments          
Segment Reporting Information          
Net sales 112,812 106,987 308,804 371,008  
Operating Segment | Metals Recycling Operations          
Segment Reporting Information          
Net sales 1,134,127 1,029,677 3,368,787 3,181,046  
Costs of goods sold 1,076,364 992,761 3,210,057 3,039,962  
Other segment items 26,230 30,782 80,197 99,359  
Operating income (loss) 31,533 6,134 78,533 41,725  
Depreciation and amortization 16,471 17,989 47,322 53,454  
Capital expenditures 30,858 17,226 84,911 62,284  
Total Assets 1,465,519   1,465,519    
Operating Segment | Metals Recycling Operations | U.S.          
Segment Reporting Information          
Net sales 361,107 327,814 1,108,509 982,324  
Operating Segment | Metals Recycling Operations | Non-U.S.          
Segment Reporting Information          
Net sales 159,879 170,802 470,093 540,729  
Operating Segment | Metals Recycling Operations | Other segments          
Segment Reporting Information          
Net sales 613,141 531,061 1,790,185 1,657,993  
Operating Segment | Steel Fabrication Operations          
Segment Reporting Information          
Net sales 378,259 449,803 1,071,394 1,375,302  
Costs of goods sold 244,038 259,109 676,768 778,129  
Other segment items 27,201 25,102 77,746 72,501  
Operating income (loss) 107,020 165,592 316,880 524,672  
Depreciation and amortization 3,415 2,829 9,621 8,288  
Capital expenditures 4,061 5,379 12,588 18,524  
Total Assets 677,757   677,757    
Operating Segment | Steel Fabrication Operations | U.S.          
Segment Reporting Information          
Net sales 376,869 446,663 1,069,333 1,365,549  
Operating Segment | Steel Fabrication Operations | Non-U.S.          
Segment Reporting Information          
Net sales 814 602 1,305 1,727  
Operating Segment | Steel Fabrication Operations | Other segments          
Segment Reporting Information          
Net sales 576 2,538 756 8,026  
Operating Segment | Aluminum Operations          
Segment Reporting Information          
Net sales 104,444 83,209 298,658 237,169  
Costs of goods sold 106,899 79,505 286,219 219,742  
Other segment items 54,055 25,722 138,311 60,862  
Operating income (loss) (56,510) (22,018) (125,872) (43,435)  
Depreciation and amortization 3,229 1,882 8,716 4,841  
Capital expenditures 65,774 477,261 484,899 989,859  
Total Assets 3,659,662   3,659,662    
Operating Segment | Aluminum Operations | U.S.          
Segment Reporting Information          
Net sales 71,139 66,842 203,347 195,952  
Operating Segment | Aluminum Operations | Non-U.S.          
Segment Reporting Information          
Net sales   138   2,496  
Operating Segment | Aluminum Operations | Other segments          
Segment Reporting Information          
Net sales 33,305 16,229 95,311 38,721  
Operating Segment | Other          
Segment Reporting Information          
Net sales 320,763 411,733 1,030,600 1,163,985  
Costs of goods sold 308,130 400,442 1,003,384 1,135,513  
Other segment items 84,684 71,445 231,359 260,433  
Operating income (loss) (72,051) (60,154) (204,143) (231,961)  
Depreciation and amortization 13,459 7,238 41,229 20,656  
Capital expenditures 17,371 20,518 29,084 38,462  
Total Assets 4,494,314   4,494,314    
Operating Segment | Other | U.S.          
Segment Reporting Information          
Net sales 316,942 402,290 1,020,233 1,149,613  
Operating Segment | Other | Non-U.S.          
Segment Reporting Information          
Net sales 3,421 9,443 9,102 14,372  
Operating Segment | Other | Other segments          
Segment Reporting Information          
Net sales 400   1,265    
Eliminations          
Segment Reporting Information          
Net sales (760,234) (656,815) (2,196,321) (2,075,748)  
Costs of goods sold (760,836) (661,074) (2,188,819) (2,078,411)  
Other segment items (371) (370) (1,112) (1,066)  
Operating income (loss) 973 4,629 (6,390) 3,729  
Capital expenditures (28,485) (20,066) (96,145) (42,830)  
Total Assets (3,127,892)   (3,127,892)    
Eliminations | Other segments          
Segment Reporting Information          
Net sales $ (760,234) $ (656,815) $ (2,196,321) $ (2,075,748)