7Baggers

Steel Dynamics Quarterly Balance Sheets Chart

Quarterly
 | 
Annual
 
 Goodwill  
 Account Receivables  
 Account Payables  
 Long-Term Debt  
 Inventory  
20200930 20201231 20210331 20210630 20210930 20211231 20220331 20220630 20220930 20221231 20230331 20230630 20230930 20231231 20240331 20240630 20240930 20241231 20250331 20250630 00.541.081.622.162.73.243.78Billion

Steel Dynamics Quarterly Balance Sheets Table

Quarterly
 | 
Annual
 
Unit: USD2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 2020-09-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 2019-06-30 2019-03-31 2018-12-31 2018-09-30 2018-06-30 2018-03-31 2017-12-31 2017-09-30 2017-06-30 2017-03-31 2016-12-31 2016-09-30 2016-06-30 2016-03-31 2015-09-30 2015-06-30 2015-03-31 2014-09-30 2014-06-30 2014-03-31 2013-09-30 2013-06-30 2013-03-31 2012-09-30 2012-06-30 2012-03-31 2011-09-30 2011-06-30 2011-03-31 2010-09-30 2010-06-30 2010-03-31 2009-06-30 2009-03-31 2008-09-30 2008-06-30 2008-03-31 2007-09-30 2007-06-30 2007-03-31 2006-12-31 2006-06-30 2006-03-31 2005-12-31 
                                                                      
  assets                                                                    
  current assets                                                                    
  cash and equivalents458,048,000 1,186,917,000 589,464,000 1,015,210,000 829,980,000 1,039,421,000 1,400,887,000 1,765,467,000 1,475,356,000 1,604,943,000 1,628,417,000 1,420,497,000 1,007,085,000 1,189,528,000 1,243,868,000 1,095,701,000 1,113,744,000 1,245,165,000 1,368,618,000 1,267,618,000 1,496,458,000 1,235,478,000 1,381,460,000 1,146,007,000 972,561,000 791,444,000 828,220,000 884,315,000 720,445,000 985,824,000 1,028,649,000 1,101,964,000 908,843,000 966,826,000 841,483,000 1,051,489,000 1,052,666,000 976,951,000 473,790,000 419,401,000 160,982,000 159,591,000 357,490,000 342,919,000 370,056,000 243,753,000 477,861,000 287,120,000 420,938,000 357,809,000 456,694,000 277,691,000 160,810,000 270,118,000 191,593,000 225,506,000 18,217,000 16,067,000 22,135,000 115,405,000 58,889,000 10,811,000 12,212,000 28,332,000 29,373,000 53,948,000 195,705,000 65,518 
  short-term investments39,577,000 19,636,000 147,811,000 645,343,000 418,367,000 653,255,000 721,210,000 500,844,000 611,701,000 714,769,000 628,215,000 583,211,000 351,005,000        69,546,000 219,193,000 262,174,000 69,529,000 114,154,000 173,723,000 228,783,000                                          
  accounts receivable1,606,114,000 1,647,704,000  1,500,685,000 1,695,840,000 1,665,424,000  1,807,313,000 2,079,949,000 2,072,619,000  2,255,206,000 2,573,539,000 2,285,245,000  1,886,759,000 1,565,317,000 1,360,535,000  915,223,000 841,593,000 995,324,000  983,515,000 1,069,061,000 1,141,038,000  1,224,477,000 1,175,795,000 983,457,000  897,838,000 866,716,000 860,676,000  752,232,000 758,145,000 654,177,000 757,110,000 772,309,000 741,309,000 1,013,503,000 852,440,000 760,654,000 722,867,000 725,105,000 703,896,000 656,517,000 660,351,000 737,531,000 764,715,000 797,577,000 828,514,000 599,108,000 577,380,000 615,624,000 340,426,000 335,715,000 1,032,734,000 1,147,277,000 817,799,000 446,131,000 399,699,000 383,632,000  322,478,000 229,124,000 202,878 
  accounts receivable-related parties94,861,000 73,097,000 54,230,000 64,272,000 79,552,000 73,636,000 73,245,000 74,736,000 63,015,000 54,355,000 79,769,000 78,788,000 87,176,000 78,423,000 5,049,000 6,036,000 5,707,000 5,928,000 3,937,000 3,619,000 2,463,000 3,084,000 2,958,000 3,431,000 3,818,000 2,357,000 3,536,000 3,713,000 4,388,000 4,198,000 22,422,000 25,179,000 20,178,000 22,471,000 26,219,000 27,227,000 35,858,000 35,024,000 41,915,000 44,213,000 28,432,000 45,165,000 58,356,000 50,446,000 50,006,000 48,022,000 49,405,000 56,233,000 55,089,000 51,643,000 51,153,000 51,824,000 55,423,000 55,837,000 50,928,000 34,108,000 24,310,000 26,124,000 89,914,000 87,333,000 82,117,000 45,326,000 42,425,000 38,346,000  31,813,000 31,771,000 38,830 
  inventories3,260,899,000 3,099,054,000 3,113,733,000 3,044,887,000 3,073,637,000 3,027,143,000 2,894,632,000 2,941,634,000 3,044,009,000 2,988,852,000 3,129,964,000 3,376,532,000 3,647,061,000 3,516,815,000 3,531,130,000 2,894,970,000 2,481,832,000 2,217,534,000 1,843,548,000 1,609,216,000 1,567,017,000 1,644,538,000 1,689,043,000 1,767,020,000 1,802,759,000 1,867,700,000 1,859,168,000 1,853,862,000 1,787,109,000 1,600,058,000 1,519,347,000 1,487,516,000 1,418,732,000 1,361,550,000 1,275,211,000 1,275,575,000 1,175,716,000 1,066,823,000 1,321,397,000 1,292,069,000 1,453,242,000 1,664,212,000 1,320,871,000 1,332,101,000 1,192,032,000 1,168,499,000 1,170,159,000 1,209,079,000 1,252,153,000 1,270,941,000 1,158,848,000 1,195,194,000 1,186,168,000 1,008,309,000 1,017,874,000 900,889,000 738,470,000 833,074,000 1,356,992,000 1,201,640,000 894,759,000 744,534,000 726,236,000 626,218,000 569,317,000 528,683,000 381,505,000 398,684 
  other current assets231,100,000 190,297,000 163,131,000 173,179,000 141,635,000 138,557,000 162,790,000 138,605,000 122,025,000 127,022,000 195,371,000 99,210,000 90,144,000 79,624,000 209,591,000 104,106,000 98,509,000 67,744,000 74,363,000 59,219,000 39,043,000 45,351,000 76,012,000 50,818,000 61,248,000 52,628,000 72,730,000 50,110,000 39,927,000 38,705,000 91,509,000 59,648,000 37,188,000 33,442,000 83,197,000 30,121,000 28,072,000 41,258,000 28,744,000 32,004,000 34,846,000 29,263,000 23,216,000 24,363,000 25,126,000 33,028,000 24,056,000 24,107,000 15,816,000 15,029,000 18,646,000 15,164,000 18,913,000 21,451,000 14,844,000 12,091,000 22,017,000 35,725,000 61,977,000 67,566,000 62,522,000 27,264,000 31,493,000 10,593,000 15,167,000 21,853,000 13,300,000 13,307 
  total current assets5,690,599,000 6,216,705,000 5,431,338,000 6,443,576,000 6,239,011,000 6,597,436,000 6,787,826,000 7,228,599,000 7,396,055,000 7,562,560,000 7,638,018,000 7,813,444,000 7,756,010,000 7,149,635,000 6,901,023,000 5,987,572,000 5,265,109,000 4,896,906,000 4,258,447,000 3,854,895,000 4,016,120,000 4,142,968,000 4,253,025,000 4,020,320,000 4,023,601,000 4,028,890,000 4,032,657,000 4,131,477,000 3,817,664,000 3,652,242,000 3,508,342,000 3,572,145,000 3,251,657,000 3,244,965,000 2,929,675,000 3,136,644,000 3,050,457,000 2,774,233,000 2,651,795,000 2,591,392,000 2,452,225,000 2,930,136,000 2,630,186,000 2,528,354,000 2,385,315,000 2,242,089,000 2,448,941,000 2,262,224,000 2,458,344,000 2,526,857,000 2,496,227,000 2,373,859,000 2,277,120,000 2,010,022,000 1,910,116,000 1,934,753,000 1,301,531,000 1,366,811,000 2,575,775,000 2,627,538,000 1,927,542,000 1,290,146,000 1,226,553,000 1,100,732,000 1,036,197,000 976,121,000 858,355,000 725,733 
  ​                                                                    
  property, plant and equipment8,465,478,000 8,322,652,000 8,117,988,000 7,825,869,000 7,433,564,000 7,063,990,000 6,734,218,000 6,313,366,000 5,783,622,000 5,491,201,000 5,373,665,000 5,146,606,000 4,886,555,000 4,827,962,000 4,751,430,000 4,654,192,000 4,526,892,000 4,340,411,000 4,105,569,000 3,862,375,000 3,587,450,000 3,327,605,000 3,135,886,000 3,031,731,000 2,947,243,000 2,936,893,000 2,945,767,000 2,901,658,000 2,909,033,000 2,657,937,000 2,675,904,000 2,708,777,000 2,729,721,000 2,760,544,000 2,787,215,000 2,928,226,000 2,885,844,000 2,914,186,000 3,013,659,000 3,047,401,000 3,085,587,000 3,420,654,000 2,177,007,000 2,197,503,000 2,241,067,000 2,232,852,000 2,232,413,000 2,213,703,000 2,208,660,000 2,199,509,000 2,168,444,000 2,176,314,000 2,187,698,000 2,214,105,000 2,237,927,000 2,240,375,000 2,144,360,000 2,108,657,000 1,997,495,000 1,916,403,000 1,720,276,000 1,358,204,000 1,249,178,000 1,161,914,000 1,136,703,000 1,113,709,000 990,506,000 999,969 
  intangible assets213,439,000 220,336,000 227,234,000 234,806,000 242,450,000 250,095,000 257,759,000 265,845,000 274,005,000 260,629,000 267,507,000 276,586,000 281,022,000 288,183,000 295,345,000 302,522,000 309,700,000 317,139,000 324,577,000 306,574,000 313,520,000 320,711,000  249,598,000 256,302,000 263,315,000  236,563,000 243,154,000 249,983,000  263,357,000 269,129,000 276,553,000  291,814,000 265,476,000 272,528,000 353,561,000 358,402,000 364,620,000 406,318,000 372,819,000 379,488,000 393,531,000 401,104,000 408,832,000 425,034,000 433,559,000 442,277,000 460,206,000 469,719,000 479,480,000 500,021,000 511,002,000 522,245,000 557,194,000 551,489,000 625,537,000 636,649,000 488,436,000 198,678,000 14,110,000 11,973,000  12,335,000   
  goodwill477,471,000 477,471,000 477,471,000 477,471,000 477,471,000 477,471,000 477,471,000 477,471,000 477,471,000 502,067,000 502,067,000 451,594,000 452,341,000 453,088,000 453,835,000 454,683,000 455,530,000 456,378,000 457,226,000 474,520,000 451,220,000 452,068,000 452,915,000 540,913,000 526,462,000 530,716,000 429,645,000 502,900,000 508,275,000 386,045,000 386,893,000 388,518,000 390,129,000 391,740,000 393,351,000 399,867,000 394,275,000 395,872,000 740,243,000 741,898,000 743,528,000 727,128,000 728,751,000 730,360,000 733,650,000 735,281,000 736,912,000 740,192,000 741,817,000 743,441,000 746,737,000 748,383,000 750,029,000 753,355,000 753,355,000 756,624,000 780,321,000 812,161,000 781,555,000 789,580,000 518,759,000 200,637,000 48,490,000 30,966,000 30,966,000 30,720,000   
  other assets701,651,000 693,264,000 681,202,000 678,099,000 668,761,000 637,758,000 651,146,000 643,675,000 620,244,000 403,303,000 378,727,000 359,468,000 335,286,000 337,769,000 129,601,000 137,016,000 130,100,000 117,062,000 119,743,000 119,192,000 100,031,000 101,571,000 106,038,000 100,685,000 104,306,000 97,419,000 25,166,000 25,770,000 26,395,000 26,606,000 10,745,000 10,848,000 12,121,000 12,387,000 11,454,000 11,440,000 14,069,000 15,220,000 63,662,000 68,099,000 70,636,000 75,790,000 57,979,000 59,564,000 97,726,000 101,353,000 106,076,000 106,927,000 101,194,000 104,549,000 111,104,000 110,461,000 111,830,000 112,386,000 112,813,000 117,578,000 84,474,000 70,744,000 66,838,000 65,763,000 154,732,000 40,993,000 30,963,000 29,785,000 25,223,000 27,053,000 30,619,000 30,397 
  total assets15,548,638,000 15,930,428,000 14,935,233,000 15,659,821,000 15,061,257,000 15,026,750,000 14,908,420,000 14,928,956,000 14,551,397,000 14,219,760,000 14,159,984,000 14,047,698,000 13,711,214,000 13,056,637,000 12,531,234,000 11,535,985,000 10,687,331,000 10,127,896,000 9,265,562,000 8,617,556,000 8,468,341,000 8,344,923,000 8,275,765,000 7,943,247,000 7,857,914,000 7,857,233,000 7,703,563,000 7,798,368,000 7,504,521,000 6,972,813,000 6,855,732,000 6,960,737,000 6,670,130,000 6,704,035,000 6,423,732,000 6,787,562,000 6,629,676,000 6,391,642,000 6,842,541,000 6,826,763,000 6,735,838,000 7,578,283,000 5,985,202,000 5,913,857,000 5,874,305,000 5,735,910,000 5,956,574,000 5,775,516,000 5,971,380,000 6,043,627,000 6,003,481,000 5,900,453,000 5,827,605,000 5,610,459,000 5,545,805,000 5,582,122,000 4,881,812,000 4,926,079,000 6,054,879,000 6,043,589,000 4,821,612,000 3,095,301,000 2,575,886,000 2,341,392,000 2,247,017,000 2,164,473,000 1,881,619,000 1,757,687 
  liabilities and equity                                                                    
  current liabilities                                                                    
  accounts payable1,216,907,000 1,252,529,000 972,645,000 1,074,501,000 1,205,679,000 1,174,060,000 1,078,645,000 1,049,317,000 1,039,149,000 1,126,795,000 1,007,304,000 1,153,299,000 1,365,608,000 1,202,033,000 1,266,833,000 1,208,499,000 1,167,102,000 1,113,250,000 760,536,000 702,991,000 696,845,000 602,875,000 509,687,000 518,909,000 516,109,000 582,284,000 536,743,000 595,286,000 657,496,000 544,419,000 473,765,000 512,290,000 467,611,000 514,788,000 382,126,000 427,790,000 450,945,000 407,405,000 378,594,000 438,363,000 367,267,000 621,579,000 422,761,000 401,539,000 411,201,000 355,678,000 401,407,000 364,380,000 381,250,000 462,492,000 453,232,000 443,693,000 437,531,000 356,042,000 354,550,000 380,284,000 225,753,000 239,355,000 644,263,000 757,590,000 473,150,000 320,276,000 212,239,000 218,156,000 145,938,000 167,920,000 178,501,000 111,067 
  accounts payable-related parties10,276,000 5,157,000 7,267,000 5,315,000 7,729,000 9,533,000 9,685,000 10,858,000 9,435,000 12,171,000 9,934,000 11,848,000 15,206,000 11,525,000 13,722,000 11,938,000 16,502,000 21,422,000 8,919,000 12,690,000 5,087,000 9,285,000 3,657,000 9,720,000 9,047,000 9,183,000 14,011,000 15,742,000 18,305,000 18,199,000 15,683,000 16,393,000 16,392,000 16,170,000 13,070,000 10,046,000 10,322,000 6,170,000 7,776,000 8,335,000 9,695,000 18,542,000 17,930,000 15,629,000 15,205,000 8,652,000 9,225,000 12,833,000 11,924,000 9,765,000 9,107,000 12,166,000 15,883,000 10,289,000 8,786,000 10,028,000 1,693,000 4,559,000 8,532,000 14,682,000 21,551,000 5,288,000 6,079,000 7,316,000  1,766,000 1,614,000 4,475 
  income taxes payable2,069,000 43,249,000 3,783,000 6,248,000 6,070,000 150,103,000 5,524,000 30,343,000 39,177,000 129,082,000 6,520,000 41,121,000 36,976,000 229,360,000 13,746,000 80,167,000 80,520,000 52,969,000 2,386,000 827,000 25,411,000 17,806,000 2,014,000 2,074,000 3,032,000 26,896,000 7,468,000 10,872,000 38,273,000 14,564,000 3,696,000 5,596,000 5,589,000 80,741,000 5,593,000 35,733,000 43,367,000 9,960,000 14,246,000 2,411,000 5,116,000 26,949,000 19,448,000 23,531,000 7,649,000 2,862,000 13,438,000 12,014,000 2,164,000 14,383,000 14,844,000 11,531,000 19,640,000 5,431,000 2,008,000 30,723,000   31,614,000 63,728,000 98,479,000 31,739,000 26,365,000 85,347,000 30,497,000    
  accrued payroll and benefits233,395,000 173,318,000 373,216,000 334,859,000 277,307,000 209,782,000 469,143,000 405,556,000 321,303,000 209,522,000 610,558,000 545,311,000 428,758,000 275,621,000 539,812,000 406,538,000 276,232,000 182,044,000 201,778,000 177,935,000 148,055,000 124,181,000 208,287,000 181,785,000 148,747,000 114,575,000 264,542,000 228,911,000 170,470,000 113,001,000 195,909,000 171,508,000 138,360,000 106,733,000 164,543,000 143,986,000 112,625,000 81,246,000 95,150,000 78,201,000 66,427,000 107,484,000 74,155,000 57,384,000 79,589,000 65,698,000 59,488,000          37,157,000 39,492,000           
  accrued expenses354,974,000 373,258,000 366,682,000 389,360,000 343,525,000 329,490,000 309,312,000 336,242,000 293,102,000 296,524,000 340,646,000 323,331,000 300,663,000 270,178,000 278,549,000 258,551,000 200,849,000 176,422,000 178,618,000 171,307,000 154,243,000 167,718,000 175,405,000 162,692,000 151,161,000 141,239,000 146,613,000 136,111,000 130,234,000 112,975,000 125,138,000 128,701,000 118,337,000 109,400,000 113,556,000 112,521,000 105,378,000 97,567,000 102,510,000 97,215,000 87,302,000 113,851,000 86,486,000 87,715,000 82,157,000 80,209,000 80,257,000 166,845,000 168,928,000 186,247,000 203,191,000 173,440,000 199,211,000 193,919,000 165,842,000 202,961,000 81,025,000 91,547,000 274,886,000 247,934,000 184,329,000  92,401,000 79,114,000 94,024,000    
  current maturities of long-term debt1,460,000 418,947,000 426,990,000 882,013,000 815,642,000 425,696,000 459,987,000 86,061,000 56,869,000 46,452,000 57,334,000 22,951,000 37,130,000 68,390,000 97,174,000 55,056,000 93,505,000 81,226,000 86,894,000 82,229,000 73,926,000 70,106,000 89,356,000 82,150,000 72,131,000 80,958,000 24,234,000 14,776,000 18,266,000 9,646,000 28,795,000 182,661,000 19,971,000 2,965,000 3,632,000 16,155,000 18,047,000 22,770,000 31,584,000 35,075,000 30,727,000 131,858,000 61,761,000 343,722,000 335,341,000 324,241,000 231,582,000 30,114,000 439,912,000 439,633,000 1,210,000 1,552,000 1,216,000 8,438,000 6,341,000 6,333,000 1,049,000 65,450,000 65,203,000   55,683,000 699,000 95,693,000 80,686,000 649,000 1,072,000 2,156 
  total current liabilities1,819,081,000 2,266,458,000 2,150,583,000 2,692,296,000 2,655,952,000 2,298,664,000 2,332,296,000 1,918,377,000 1,759,035,000 1,820,546,000 2,032,296,000 2,131,396,000 2,201,872,000 2,090,646,000 2,227,369,000 2,054,289,000 1,852,245,000 1,661,189,000 1,258,787,000 1,175,628,000 1,115,426,000 1,031,720,000 1,006,698,000 1,005,275,000 925,736,000 1,003,090,000 1,019,137,000 1,049,665,000 1,058,586,000 860,740,000 868,519,000 1,066,529,000 795,892,000 881,447,000 712,815,000 794,113,000 779,224,000 673,046,000 677,858,000 698,588,000 618,334,000 1,041,540,000 713,223,000 951,431,000 954,202,000 869,849,000 814,687,000 605,399,000 1,019,449,000 1,121,868,000 717,467,000 670,846,000 689,644,000 595,452,000 554,298,000 640,011,000 488,389,000 729,650,000 1,674,710,000 1,395,509,000 1,009,980,000 672,778,000 580,402,000 501,429,000 399,490,000 273,246,000 244,228,000 207,177 
  long-term debt3,779,559,000 3,777,132,000 2,804,017,000 2,801,871,000 2,212,802,000 2,612,246,000 2,611,069,000 3,009,010,000 3,010,829,000 3,014,358,000 3,013,241,000 3,012,120,000 3,011,116,000 3,010,109,000 3,008,702,000 3,019,175,000 3,016,486,000 3,016,200,000 3,015,782,000 2,636,615,000 2,636,722,000 2,646,012,000 2,644,988,000 2,355,243,000 2,355,917,000 2,354,427,000 2,352,489,000 2,351,979,000 2,352,127,000 2,353,703,000 2,353,145,000 2,351,483,000 2,354,337,000 2,353,744,000 2,353,194,000 2,570,837,000 2,573,186,000 2,575,528,000                               
  deferred income taxes957,564,000 918,435,000 902,186,000 943,154,000 928,321,000 923,745,000 944,768,000 961,117,000 941,491,000 898,112,000 889,103,000 856,650,000 853,407,000 856,790,000 854,905,000 722,220,000 652,059,000 602,185,000 536,288,000 512,503,000 503,034,000 489,248,000 484,169,000 468,248,000 457,784,000 447,087,000 435,838,000 398,814,000 375,719,000 314,736,000 305,949,000 461,399,000 459,639,000 454,426,000 448,375,000 450,159,000 433,116,000 416,260,000 28,839,000 31,396,000 33,414,000 18,402,000 17,813,000 17,871,000 25,228,000 23,682,000 23,564,000 28,229,000 26,917,000 26,089,000 21,652,000 21,114,000 21,007,000 24,786,000 21,678,000 21,585,000 32,179,000 26,631,000 12,023,000 8,317,000 11,456,000    13,964,000   6,516 
  other liabilities148,384,000 134,509,000 133,201,000 143,200,000 143,968,000 144,336,000 180,760,000 182,161,000 175,073,000 180,321,000 129,539,000 112,327,000 95,929,000 120,918,000 120,087,000 117,367,000 136,189,000 113,125,000 106,479,000 94,011,000 73,237,000 72,004,000 75,055,000 70,126,000 70,196,000 63,171,000 8,870,000 11,833,000 18,330,000 20,257,000 21,811,000 20,305,000 20,781,000 19,711,000 20,649,000 20,751,000 19,544,000 19,302,000 16,405,000 16,147,000 15,936,000 24,922,000 22,356,000 22,843,000 22,898,000 20,324,000 19,947,000 18,564,000 81,795,000 82,613,000 77,391,000 63,794,000 62,944,000 62,145,000 61,594,000 60,957,000 67,095,000 65,759,000 63,027,000 44,003,000 39,705,000        
  total liabilities6,704,588,000 7,096,534,000 5,989,987,000 6,580,521,000 5,941,043,000 5,978,991,000 6,068,893,000 6,070,665,000 5,886,428,000 5,913,337,000 6,064,179,000 6,112,493,000 6,162,324,000 6,078,463,000 6,211,063,000 5,913,051,000 5,656,979,000 5,392,699,000 4,917,336,000 4,418,757,000 4,328,419,000 4,238,984,000 4,210,910,000 3,898,892,000 3,809,633,000 3,867,775,000 3,816,334,000 3,812,291,000 3,804,762,000 3,549,436,000 3,549,424,000 3,899,716,000 3,630,649,000 3,709,328,000 3,535,033,000                                  
  commitments and contingencies                                                                    
  redeemable noncontrolling interests141,226,000 171,212,000 171,212,000 171,212,000 171,212,000 171,212,000 171,212,000 171,212,000 171,212,000 186,205,000 181,503,000 172,403,000 168,303,000 227,914,000 211,414,000 186,814,000 176,414,000 163,614,000 158,614,000 155,414,000 152,414,000 151,014,000 143,614,000 143,614,000 139,930,000 139,930,000 111,240,000 111,240,000 111,240,000 111,240,000 111,240,000 111,240,000 111,240,000 111,240,000 111,240,000 126,340,000 126,340,000 126,340,000 126,340,000 125,972,000 126,340,000 126,340,000 124,180,000 121,834,000 110,054,000 104,734,000                       
  equity                                                                    
  common stock voting, 0.0025 par value; 900,000,000 shares authorized;                                                                    
  268,417,974 and 268,377,165 shares issued; and 147,788,364 and 151,117,153                                                                    
  shares outstanding, as of june 30, 2025 and december 31, 2024, respectively652,000                                                                    
  treasury stock                                                                    
  as of june 30, 2025 and december 31, 2024, respectively-7,532,706,000                                                                    
  additional paid-in capital1,229,809,000 1,218,235,000 1,229,819,000 1,220,089,000 1,207,771,000 1,197,176,000 1,217,610,000 1,214,894,000 1,204,134,000 1,194,079,000 1,212,566,000 1,219,947,000 1,213,481,000 1,204,023,000 1,218,933,000 1,219,438,000 1,210,833,000 1,202,945,000 1,207,392,000 1,200,228,000 1,191,614,000 1,183,776,000 1,181,012,000 1,175,512,000 1,167,505,000 1,160,139,000 1,160,048,000 1,156,556,000 1,149,367,000 1,142,871,000 1,141,534,000 1,147,463,000 1,141,050,000 1,135,892,000 1,132,749,000 1,132,365,000 1,125,519,000 1,115,008,000 1,104,832,000 1,099,669,000 1,088,605,000 1,075,593,000 1,058,921,000 1,092,281,000 1,060,780,000 1,050,470,000 1,045,973,000 1,033,857,000 1,033,086,000 1,031,043,000 1,023,295,000 1,019,061,000 1,010,698,000 988,972,000 983,780,000 978,090,000 958,558,000 544,971,000 538,445,000 583,756,000 562,847,000 392,269,000 386,935,000 375,887,000 367,772,000 414,792,000 421,648,000 405,900 
  retained earnings15,165,119,000 14,940,418,000 14,798,082,000 14,660,426,000 14,413,148,000 14,056,868,000 13,545,590,000 13,189,468,000 12,681,894,000 11,940,621,000 11,375,765,000 10,799,863,000 9,945,710,000 8,800,883,000 7,761,417,000 6,721,734,000 5,783,184,000 5,134,398,000 4,758,969,000 4,624,019,000 4,576,629,000 4,553,882,000 4,419,296,000 4,349,523,000 4,250,419,000 4,109,034,000 3,958,320,000 3,730,662,000 3,376,163,000 3,057,904,000 2,874,693,000 2,606,831,000 2,490,373,000 2,373,718,000 2,210,459,000 2,224,963,000 2,101,729,000 1,993,910,000 2,250,901,000 2,223,599,000 2,225,354,000 2,300,660,000 2,237,147,000 2,192,413,000 2,149,389,000 2,116,262,000 2,111,597,000 2,049,011,000 2,058,108,000 2,035,569,000 2,003,486,000 1,982,051,000 1,905,207,000 1,829,659,000 1,827,194,000 1,794,247,000 1,682,208,000 1,714,310,000 1,921,240,000 1,746,544,000 1,555,860,000 1,348,576,000 1,261,085,000 1,180,700,000 1,093,271,000 898,522,000 811,581,000 744,344 
  accumulated other comprehensive income1,178,000   -445,000 -1,428,000 -13,000 421,000 -494,000 1,027,000 1,800,000 889,000 -2,748,000 -4,999,000 9,296,000 -2,091,000 10,583,000 32,344,000 5,667,000 1,902,000 95,000 216,000 30,000 -7,000 39,000 78,000 130,000 301,000                                          
  total steel dynamics, inc. equity8,864,052,000 8,824,710,000 8,934,287,000 9,081,502,000 9,130,773,000 9,072,408,000 8,866,666,000 8,893,535,000 8,707,983,000 8,336,637,000 8,130,357,000 7,971,156,000 7,588,348,000 6,964,354,000 6,304,641,000 5,607,926,000 5,020,114,000 4,728,792,000 4,345,164,000 4,201,183,000 4,145,250,000 4,113,526,000 4,075,834,000 4,056,641,000 4,064,490,000 4,008,111,000 3,935,071,000 4,033,768,000 3,746,981,000 3,470,719,000 3,351,574,000 3,104,725,000 3,080,939,000 3,035,179,000 2,927,020,000 2,965,917,000 2,835,837,000 2,717,209,000 2,959,896,000 2,927,413,000 2,918,077,000 2,978,084,000 2,897,897,000 2,568,795,000 2,492,437,000 2,448,999,000 2,439,133,000 2,363,025,000 2,371,349,000 2,346,224,000 2,301,568,000 2,275,899,000 2,190,691,000                
  noncontrolling interests-161,228,000 -162,028,000 -160,253,000 -173,414,000 -181,771,000 -195,861,000 -198,351,000 -206,456,000 -214,226,000 -216,419,000 -216,055,000 -208,354,000 -207,761,000 -214,094,000 -195,884,000 -171,806,000 -166,176,000 -157,209,000 -155,552,000 -157,798,000 -157,742,000 -158,601,000 -154,593,000 -155,900,000 -156,139,000 -158,583,000 -159,082,000 -158,931,000 -158,462,000 -158,582,000 -156,506,000 -154,944,000 -152,698,000 -151,712,000 -149,561,000 -140,555,000                  12,037,000 13,618,000 13,417,000 13,953,000 14,274,000           
  total equity8,702,824,000 8,662,682,000 8,774,034,000 8,908,088,000 8,949,002,000 8,876,547,000 8,668,315,000 8,687,079,000 8,493,757,000 8,120,218,000 7,914,302,000 7,762,802,000 7,380,587,000 6,750,260,000 6,108,757,000 5,436,120,000 4,853,938,000 4,571,583,000 4,189,612,000 4,043,385,000 3,987,508,000 3,954,925,000 3,921,241,000 3,900,741,000 3,908,351,000 3,849,528,000 3,775,989,000 3,874,837,000 3,588,519,000 3,312,137,000 3,195,068,000 2,949,781,000 2,928,241,000 2,883,467,000 2,777,459,000 2,825,362,000 2,698,266,000 2,581,166,000 2,829,445,000 2,798,728,000 2,796,753,000 2,911,649,000 2,835,030,000 2,512,496,000 2,447,734,000 2,410,737,000 2,406,590,000 2,339,054,000 2,354,136,000 2,332,561,000 2,282,666,000 2,257,194,000 2,173,400,000                
  total liabilities and equity15,548,638,000 15,930,428,000 14,935,233,000 15,659,821,000 15,061,257,000 15,026,750,000 14,908,420,000 14,928,956,000 14,551,397,000 14,219,760,000 14,159,984,000 14,047,698,000 13,711,214,000 13,056,637,000 12,531,234,000 11,535,985,000 10,687,331,000 10,127,896,000 9,265,562,000 8,617,556,000 8,468,341,000 8,344,923,000 8,275,765,000 7,943,247,000 7,857,914,000 7,857,233,000 7,703,563,000 7,798,368,000 7,504,521,000 6,972,813,000 6,855,732,000 6,960,737,000 6,670,130,000 6,704,035,000 6,423,732,000 6,787,562,000 6,629,676,000 6,391,642,000 6,842,541,000 6,826,763,000 6,735,838,000 7,578,283,000 5,985,202,000 5,913,857,000 5,874,305,000 5,735,910,000 5,956,574,000 5,775,516,000 5,971,380,000 6,043,627,000 6,003,481,000 5,900,453,000 5,827,605,000                
  268,417,974 and 268,377,165 shares issued; and 149,380,035 and 151,117,153                                                                    
  shares outstanding, as of march 31, 2025 and december 31, 2024, respectively 652,000                                                                   
  as of march 31, 2025 and december 31, 2024, respectively -7,334,595,000                                                                   
  as of december 31, 2024 and 2023, respectively  1,362,969,000                                                                  
  common stock voting, .0025 par value; 900,000,000 shares authorized;                                                                    
  268,377,165 and 268,112,991 shares issued; and 151,117,153 and 160,018,100                                                                    
  shares outstanding, as of december 31, 2024 and 2023, respectively  652,000                                                                  
  268,142,204 and 268,112,991 shares issued; and 153,042,184 and 160,018,100                                                                    
  shares outstanding, as of september 30, 2024 and december 31, 2023, respectively   651,000                                                                 
  as of september 30, 2024 and december 31, 2023, respectively   -6,799,219,000                                                                 
  268,142,204 and 268,112,991 shares issued; and 155,617,909 and 160,018,100                                                                    
  shares outstanding, as of june 30, 2024 and december 31, 2023, respectively    651,000                                                                
  as of june 30, 2024 and december 31, 2023, respectively    -6,489,369,000                                                                
  268,142,204 and 268,112,991 shares issued; and 157,878,760 and 160,018,100                                                                    
  shares outstanding, as of march 31, 2024 and december 31, 2023, respectively     651,000                                                               
  as of march 31, 2024 and december 31, 2023, respectively     -6,182,274,000                                                               
  as of december 31, 2023, and december 31, 2022, respectively      1,535,062,000                                                              
  268,112,991 and 267,762,488 shares issued; and 160,018,100 and 172,936,163                                                                    
  shares outstanding, as of december 31, 2023, and december 31, 2022, respectively      651,000                                                              
  267,772,737 and 267,762,488 shares issued; and 163,489,456 and 172,936,163                                                                    
  shares outstanding, as of september 30, 2023 and december 31, 2022, respectively       650,000                                                             
  as of september 30, 2023 and december 31, 2022, respectively       -5,510,983,000                                                             
  267,772,737 and 267,762,488 shares issued; and 166,383,336 and 172,936,163                                                                    
  shares outstanding, as of june 30, 2023 and december 31, 2022, respectively        650,000                                                            
  as of june 30, 2023 and december 31, 2022, respectively        -5,179,722,000                                                            
  267,772,737 and 267,762,488 shares issued; and 170,170,375 and 172,936,163                                                                    
  shares outstanding, as of march 31, 2023 and december 31, 2022, respectively         650,000                                                           
  as of march 31, 2023 and december 31, 2022, respectively         -4,800,513,000                                                           
  as of december 31, 2022, and december 31, 2021, respectively          1,976,282,000                                                          
  267,762,488 and 267,224,622 shares issued; and 172,936,163 and 194,997,922                                                                    
  shares outstanding, as of december 31, 2022, and december 31, 2021, respectively          650,000                                                          
  accrued interest           33,535,000 17,531,000 33,539,000 17,533,000 33,540,000 17,535,000 33,856,000 19,656,000 27,649,000 11,859,000 39,749,000 18,292,000 47,945,000 25,509,000 47,955,000 25,526,000 47,967,000 25,542,000 47,936,000 25,533,000 49,380,000 29,632,000 50,650,000 30,295,000 47,882,000 38,540,000 47,928,000 47,998,000 38,988,000 51,800,000 21,277,000 30,682,000 21,911,000 23,060,000 32,509,000 19,290,000          27,656,000 58,191,000        9,810,000  8,952 
  267,228,549 and 267,224,622 shares issued; and 176,563,632 and 194,997,922                                                                    
  shares outstanding, as of september 30, 2022 and december 31, 2021, respectively           649,000                                                         
  as of september 30, 2022 and december 31, 2021, respectively           -4,046,555,000                                                         
  267,224,622 and 267,224,622 shares issued; and 182,610,729 and 194,997,922                                                                    
  shares outstanding, as of june 30, 2022 and december 31, 2021, respectively            649,000                                                        
  as of june 30, 2022 and december 31, 2021, respectively            -3,566,493,000                                                        
  267,224,622 and 267,224,622 shares issued; and 189,247,115 and 194,997,922                                                                    
  shares outstanding, as of march 31, 2022 and december 31, 2021, respectively             649,000                                                       
  as of march 31, 2022 and december 31, 2021, respectively             -3,050,497,000                                                       
  as of december 31, 2021, and december 31, 2020, respectively              1,911,385,000                                                      
  267,224,622 and 266,618,566 shares issued; and 194,997,922 and 210,914,264                                                                    
  shares outstanding, as of december 31, 2021, and december 31, 2020, respectively              649,000                                                      
  as of december 31, 2021, and december 31, 2020 respectively              -2,674,267,000                                                      
  266,618,566 shares issued; and 199,778,688 and 210,914,264                                                                    
  shares outstanding, as of september 30, 2021 and december 31, 2020, respectively               648,000                                                     
  as of september 30, 2021 and december 31, 2020, respectively               -2,344,477,000                                                     
  266,618,566 shares issued; and 205,307,447 and 210,914,264                                                                    
  shares outstanding, as of june 30, 2021 and december 31, 2020, respectively                648,000                                                    
  as of june 30, 2021 and december 31, 2020, respectively                -2,006,895,000                                                    
  266,618,566 shares issued; and 211,218,956 and 210,914,264                                                                    
  shares outstanding, as of march 31, 2021 and december 31, 2020, respectively                 648,000                                                   
  as of march 31, 2021 and december 31, 2020, respectively                 -1,614,866,000                                                   
  december 31, 2020, and december 31, 2019, respectively                  967,981,000                                                  
  266,618,566 and 266,072,787 shares issued; and 210,914,264 and 214,502,639                                                                    
  shares outstanding, as of december 31, 2020, and december 31, 2019, respectively                  648,000                                                  
  as of december 31, 2020, and december 31, 2019 respectively                  -1,623,747,000                                                  
  266,072,787 and 266,072,787 shares issued; and 210,366,497 and 214,502,639                                                                    
  shares outstanding, as of september 30, 2020 and december 31, 2019, respectively                   646,000                                                 
  as of september 30, 2020 and december 31, 2019, respectively                   -1,623,805,000                                                 
  266,072,787 and 266,072,787 shares issued; and 210,364,813 and 214,502,639                                                                    
  shares outstanding, as of june 30, 2020 and december 31, 2019, respectively                    646,000                                                
  as of june 30, 2020 and december 31, 2019, respectively                    -1,623,855,000                                                
  266,079,627 and 266,072,787 shares issued; and 210,338,959 and 214,502,639                                                                    
  shares outstanding, as of march 31, 2020 and december 31, 2019, respectively                     646,000                                               
  as of march 31, 2020 and december 31, 2019, respectively                     -1,624,808,000                                               
  accounts receivable, net of related allowances of 15,867 and 17,495 as of                                                                    
  december 31, 2019, and december 31, 2018, respectively                      841,378,000                                              
  intangible assets, net of accumulated amortization of 322,611 and 294,449 as of                                                                    
  266,072,787 and 265,822,402 shares issued; and 214,502,639 and 225,272,174                                                                    
  shares outstanding, as of december 31, 2019, and december 31, 2018, respectively                      646,000                                              
  as of december 31, 2019, and december 31, 2018 respectively                      -1,525,113,000                                              
  265,553,499 and 265,822,402 shares issued; and 215,740,572 and 225,272,174                                                                    
  shares outstanding, as of september 30, 2019 and december 31, 2018, respectively                       645,000                                             
  as of september 30, 2019 and december 31, 2018, respectively                       -1,469,078,000                                             
  265,553,499 and 265,822,402 shares issued; and 219,797,547 and 225,272,174                                                                    
  shares outstanding, as of june 30, 2019 and december 31, 2018, respectively                        645,000                                            
  as of june 30, 2019 and december 31, 2018, respectively                        -1,354,157,000                                            
  265,552,825 and 265,822,402 shares issued; and 222,931,285 and 225,272,174                                                                    
  shares outstanding, as of march 31, 2019 and december 31, 2018, respectively                         645,000                                           
  as of march 31, 2019 and december 31, 2018, respectively                         -1,261,837,000                                           
  net sales                                                                    
  unrelated parties                         2,814,486,000 11,801,609,000 3,220,891,000 3,083,822,000 2,597,312,000 9,364,213,000 2,399,116,000 2,347,304,000 2,319,663,000 7,607,180,000 2,060,596,000 1,978,984,000 1,698,004,000 1,901,415,000 1,945,983,000 2,003,973,000 2,276,747,000 1,987,635,000 1,765,881,000 1,838,464,000 1,735,420,000 1,728,401,000 1,624,561,000 1,830,117,000 1,905,075,000 1,976,296,000 2,004,283,000 1,941,664,000                
  related parties                         2,949,000 20,230,000 2,656,000 6,703,000 6,563,000 174,584,000 44,266,000 43,416,000 48,553,000 169,929,000 40,714,000 44,918,000 43,297,000 49,508,000 59,024,000 43,462,000 62,269,000 82,126,000 64,201,000 73,274,000 65,920,000 67,295,000 68,829,000 79,686,000 76,965,000 67,159,000 75,448,000 74,305,000                
  total net sales                         2,817,435,000 11,821,839,000 3,223,547,000 3,090,525,000 2,603,875,000 9,538,797,000 2,443,382,000 2,390,720,000 2,368,216,000 7,777,109,000 2,101,310,000 2,023,902,000 1,741,301,000 1,950,923,000 2,005,007,000 2,047,435,000 2,339,016,000 2,069,761,000 1,830,082,000 1,911,738,000 1,801,340,000 1,795,696,000 1,693,390,000 1,909,803,000 1,982,040,000 2,043,455,000 2,079,731,000 2,015,969,000                
  costs of goods sold                         2,383,865,000 9,499,025,000 2,537,466,000 2,438,443,000 2,140,459,000 7,956,783,000 2,046,864,000 1,998,202,000 1,896,062,000 6,442,245,000 1,692,807,000 1,643,519,000 1,505,265,000 1,722,197,000 1,833,264,000 1,860,393,000 2,050,504,000 1,846,990,000 1,666,778,000 1,714,546,000 1,653,648,000 1,619,432,000 1,536,989,000 1,727,667,000 1,780,776,000 1,844,212,000 1,803,345,000 1,720,215,000                
  gross profit                         433,570,000 2,322,814,000 686,081,000 652,082,000 463,416,000 1,582,014,000 396,518,000 392,518,000 472,154,000 1,334,864,000 408,503,000 380,383,000 236,036,000 228,726,000 171,743,000 187,042,000 288,512,000 222,771,000 163,304,000 197,192,000 147,692,000 176,264,000 156,401,000 182,136,000 201,264,000 199,243,000 276,386,000 295,754,000                
  selling, general and administrative expenses                         111,038,000 416,640,000 102,614,000 101,031,000 106,431,000 394,631,000 97,056,000 98,433,000 102,933,000 374,009,000 95,185,000 96,853,000 87,530,000 82,371,000 82,660,000 76,350,000 80,240,000 73,463,000 70,042,000 67,553,000 65,356,000 65,262,000 62,984,000 61,235,000 64,384,000 72,876,000 63,631,000 65,141,000                
  profit sharing                         23,677,000 155,985,000 45,304,000 42,335,000 26,662,000 91,309,000 21,175,000 21,308,000 27,231,000 71,285,000 22,255,000 20,176,000 9,291,000 9,008,000 5,031,000 4,598,000 12,865,000 10,469,000 5,395,000 8,469,000 4,779,000 6,643,000 3,954,000 8,211,000 8,072,000 7,428,000 14,454,000 15,203,000                
  amortization of intangible assets                         7,013,000 27,780,000 6,591,000 6,829,000 6,926,000 29,193,000 7,272,000 7,424,000 7,424,000 28,765,000 7,208,000 7,232,000 7,250,000 6,318,000 6,493,000 6,323,000 6,764,000 6,934,000 6,935,000 7,897,000 8,051,000 8,127,000 8,848,000 8,991,000  10,154,000 10,082,000                 
  operating income                         291,842,000 1,722,409,000 531,572,000 501,887,000 323,397,000 1,066,881,000 271,015,000 265,353,000 334,566,000 727,966,000 283,855,000 256,122,000 131,965,000 131,029,000 77,559,000 99,771,000 188,643,000 131,905,000 80,932,000 113,273,000 69,198,000 96,232,000 72,721,000 103,699,000 119,816,000 108,785,000 188,219,000 205,326,000                
  interest expense, net of capitalized interest                         31,122,000 126,620,000 31,560,000 31,512,000 31,896,000 134,399,000 34,177,000 33,869,000 33,973,000 146,037,000 36,199,000 36,646,000 37,043,000 37,084,000 37,163,000 43,087,000 31,904,000 30,050,000 30,569,000 30,970,000 31,465,000 34,629,000 41,490,000 41,106,000 41,112,000 44,702,000 44,812,000 43,346,000                
  other income                         -6,343,000 -23,985,000 -7,103,000 -5,035,000 -4,463,000 -2,753,000 2,526,000 -3,835,000 -3,659,000 17,796,000 4,351,000   239,000  16,192,000 22,072,000  -631,000    24,010,000  10,248,000                   
  income before income taxes                         267,063,000 1,619,774,000 507,115,000 475,410,000 295,964,000 935,235,000 234,312,000 235,319,000 304,252,000 564,133,000 243,305,000 221,294,000 96,714,000 93,706,000 41,608,000 40,492,000 134,667,000 103,609,000 50,994,000 84,155,000 38,979,000 62,649,000 7,221,000 64,485,000 68,456,000 67,606,000 149,152,000 166,547,000                
  income tax expense                         62,236,000 363,969,000 109,209,000 112,838,000 70,489,000  83,300,000 82,372,000 105,586,000    35,396,000                               
  net income                         204,827,000 1,255,805,000 397,906,000 362,572,000 225,475,000 805,796,000 151,012,000 152,947,000 198,666,000 360,006,000 154,413,000 140,443,000 61,318,000 58,867,000 25,325,000 26,954,000 87,657,000 66,341,000 33,698,000 51,090,000 23,273,000 41,252,000 6,105,000 39,305,000 41,777,000 39,857,000 95,826,000 104,230,000                
  net (income) loss attributable to noncontrolling interests                         -499,000   -123,000                                        
  net income attributable to steel dynamics, inc.                         204,328,000 1,258,379,000 398,375,000 362,449,000 227,551,000 812,741,000 153,258,000 153,933,000 200,817,000 382,115,000 157,397,000 141,969,000 62,737,000 60,617,000 31,550,000 30,761,000 91,173,000 72,303,000 38,579,000 57,486,000 28,958,000 48,215,000 12,833,000 44,472,000 45,675,000 43,304,000 98,710,000 105,903,000                
  basic earnings per share attributable to steel dynamics,                                                                    
  inc. stockholders                         910 5,380 1,700 1,540 960 3,380 640 640 830 1,570 650                                 
  weighted-average common shares outstanding                         224,058,000 233,923,000 234,208,000 235,617,000 236,623,000 240,132,000 239,066,000 241,343,000 242,943,000 243,576,000 243,761,000 243,655,000 243,202,000 242,074,000 241,900,000 241,535,000 240,087,000 226,220,000 223,011,000 220,926,000 220,471,000 219,995,000 219,191,000 219,104,000 218,996,000 218,674,000 218,500,000 217,992,000                
  diluted earnings per share attributable to steel dynamics, inc.                                                                    
  stockholders, including the effect of assumed conversions                                                                    
  when dilutive                         910 5,350 1,690 1,530 960 3,360 640 630 820 1,560 640                                 
  weighted-average common shares and share equivalents outstanding                         224,962,000 235,193,000 235,649,000 236,945,000 237,723,000 241,781,000 240,880,000 243,021,000 244,546,000 245,298,000 245,682,000 245,392,000 244,608,000 243,822,000 243,491,000 242,867,000 242,244,000 242,048,000 241,394,000 239,001,000 221,736,000 238,087,000 220,044,000 236,208,000 236,526,000 235,759,000 236,266,000 236,224,000                
  dividends declared per share                         240 750 187.5 187.5 187.5 620 155 155 155 560 140 140 140 137.5 137.5 137.5 115 115 115 110 110 110 100 100 100 100 100 100                
  accounts receivable, net of related allowances of 17,495 and 15,036 as of                                                                    
  december 31, 2018, and december 31, 2017, respectively                          1,040,220,000                                          
  intangible assets, net of accumulated amortization of 294,449 and 269,868 as of                                                                    
  265,822,402 and 265,003,133 shares issued; and 225,272,174 and 237,396,839                                                                    
  shares outstanding, as of december 31, 2018, and december 31, 2017, respectively                          645,000                                          
  as of december 31, 2018, and december 31, 2017 respectively                          -1,184,243,000                                          
  asset impairment charge                                                                    
  net income attributable to noncontrolling interests                          2,574,000 469,000  2,076,000 6,945,000 2,246,000 986,000 2,151,000 22,109,000 2,984,000 1,526,000 1,419,000 1,750,000 6,225,000 3,807,000 3,516,000 5,962,000 4,881,000 6,396,000 5,685,000 6,963,000 6,728,000 5,167,000 3,898,000 3,447,000 2,884,000 1,673,000                
  short term investments                           115,000,000 90,000,000 40,000,000                                       
  265,117,573 and 265,003,133 shares issued; and 233,422,108 and 237,396,839                                                                    
  shares outstanding, as of september 30, 2018 and december 31, 2017, respectively                           644,000                                         
  as of september 30, 2018 and december 31, 2017, respectively                           -854,052,000                                         
  accumulated other comprehensive loss                           -42,000 -105,000                                        
  265,006,573 and 265,003,133 shares issued; and 235,096,384 and 237,396,839                                                                    
  shares outstanding, as of june 30, 2018 and december 31, 2017, respectively                            644,000                                        
  as of june 30, 2018 and december 31, 2017 respectively                            -779,088,000                                        
  265,080,663 and 265,003,133 shares issued; and 236,095,748 and 237,396,839                                                                    
  shares outstanding, as of march 31, 2018 and december 31, 2017, respectively                             644,000                                       
  as of march 31, 2018 and december 31, 2017 respectively                             -730,700,000                                       
  accounts receivable, net of related allowances of 15,036 and 14,413 as of                                                                    
  december 31, 2017, and december 31, 2016, respectively                              846,415,000                                      
  restricted cash                              16,939,000 17,092,000 17,373,000 17,846,000 18,060,000 19,571,000 19,555,000 19,603,000 19,621,000 19,571,000 19,242,000 18,257,000 18,460,000 18,588,000 23,016,000 23,231,000 23,400,000 27,436,000 27,806,000 26,994,000 20,763,000 21,717,000 21,448,000 20,570,000 20,592,000 10,547,000 13,932,000 16,217,000 7,679,000 7,656,000 11,867,000 6,643,000 6,592,000 6,022,000 5,702,000 4,535,000 2,139,000 1,588 
  intangible assets, net of accumulated amortization of 269,868 and 294,676 as of                                                                    
  265,003,133 and 264,130,544 shares issued; and 237,396,839 and 243,785,485                                                                    
  shares outstanding, as of december 31, 2017, and december 31, 2016, respectively                              644,000                                      
  as of december 31, 2017, and december 31, 2016 respectively                              -665,297,000                                      
  income tax benefit                              129,439,000    204,127,000                                  
  264,161,359 and 264,130,544 shares issued; and 236,951,784 and 243,785,485                                                                    
  shares outstanding, as of september 30, 2017 and december 31, 2016, respectively                               641,000                                     
  as of september 30, 2017 and december 31, 2016 respectively                               -650,210,000                                     
  264,161,359 and 264,130,544 shares issued; and 239,872,874 and 243,785,485                                                                    
  shares outstanding, as of june 30, 2017 and december 31, 2016, respectively                                641,000                                    
  as of june 30, 2017 and december 31, 2016 respectively                                -551,125,000                                    
  264,135,545 and 264,130,544 shares issued; and 242,110,745 and 243,785,485                                                                    
  shares outstanding, as of march 31, 2017 and december 31, 2016, respectively                                 641,000                                   
  as of march 31, 2017 and december 31, 2016 respectively                                 -475,072,000                                   
  accounts receivable, net of related allowances of 14,413 and 9,765 as of                                                                    
  december 31, 2016, and 2015, respectively                                  703,565,000                                  
  intangible assets, net of accumulated amortization of 294,676 and 265,940 as of                                                                    
  264,130,544 and 262,937,139 shares issued; and 243,785,485 and 243,089,514                                                                    
  shares outstanding, as of december 31, 2016, and december 31, 2015, respectively                                  641,000                                  
  as of december 31, 2016, and december 31, 2015 respectively                                  -416,829,000                                  
  asset impairment charges                                  132,839,000                                  
  263,396,348, and 262,937,139 shares issued; and 243,770,777, and 243,089,514                                                                    
  shares outstanding, as of september 30, 2016 and december 31, 2015, respectively                                   640,000                                 
  as of september 30, 2016 and december 31, 2015 respectively                                   -392,051,000                                 
  income taxes                                   88,892,000 80,851,000  34,839,000 16,283,000 13,538,000 47,010,000 37,268,000 17,296,000 33,065,000 15,706,000 21,397,000 1,116,000 25,180,000 26,679,000 27,749,000 53,326,000 62,317,000                
  common stock voting, .0025 par value; 900,000,000 shares authorized; 263,370,594, and 262,937,139 shares issued; and 243,745,023, and 243,089,514 shares outstanding, as of june 30, 2016 and december 31, 2015, respectively                                    639,000                                
  other income (income)                                                                    
  basic earnings per share attributable to steel dynamics, inc. stockholders                                    580 260 250 130 130 380 320 170 260 130 220 60 200 210 200 450 490                
  diluted earnings per share attributable to steel dynamics, inc. stockholders, including the effect of assumed conversions when dilutive                                    580 260 250 130 130 380 310 170 250 130 210 60 200 200 190 430 460                
  common stock voting, .0025 par value; 900,000,000 shares authorized; 263,142,777, and 262,937,139 shares issued; and 243,500,764, and 243,089,514 shares outstanding, as of march 31, 2016 and december 31, 2015, respectively                                     639,000                               
  senior term loan                                      228,125,000 231,250,000 234,375,000 189,062,000 199,375,000                          
  senior notes                                      2,350,000,000 2,350,000,000 2,350,000,000 2,700,000,000 1,500,000,000 1,500,000,000 1,500,000,000 1,500,000,000 1,500,000,000                      
  other long-term debt                                      37,694,000 38,324,000 39,069,000 40,932,000 42,753,000 45,341,000 46,744,000 40,493,000 41,093,000 35,491,000 36,224,000 36,707,000 41,550,000 40,293,000 40,780,000 71,938,000 64,179,000 62,364,000 42,392,000 30,314,000 15,884,000 17,785,000 16,085,000 16,536,000 16,750,000 16,836,000  17,887,000 17,807,000  
  total long-term debt                                      2,615,819,000 2,619,574,000 2,623,444,000 2,929,994,000 1,742,128,000 1,755,028,000 1,773,619,000 1,774,243,000 2,069,214,000 2,173,925,000 1,928,097,000 1,932,019,000 2,379,050,000                  
  common stock voting, .0025 par value; 900,000,000 shares authorized; 261,938,768, and 261,420,126 shares issued; and 242,090,224, and 241,449,423 shares outstanding, as of september 30, 2015 and december 31, 2014, respectively                                      636,000                              
  common stock voting, .0025 par value; 900,000,000 shares authorized; 261,904,809, and 261,420,126 shares issued; and 242,055,377, and 241,449,423 shares outstanding, as of june 30, 2015 and december 31, 2014, respectively                                       636,000                             
  common stock voting, .0025 par value; 900,000,000 shares authorized; 261,539,685 and 261,420,126 shares issued; and 241,688,172 and 241,449,423 shares outstanding, as of march 31, 2015 and december 31, 2014, respectively                                        635,000                            
  common stock voting, .0025 par value; 900,000,000 shares authorized; 260,332,348 and 258,840,350 shares issued; and 240,365,196 and 222,867,408 shares outstanding, as of september 30, 2014 and december 31, 2013, respectively                                         649,000                           
  impairment charges                                             308,000  7,894,000                     
  total selling, general and administrative expenses                                         99,869,000 90,866,000 82,372,000 83,919,000 78,494,000 80,032,000 83,680,000 78,437,000 81,448,000 90,458,000 88,167,000 90,428,000                
  common stock voting, .0025 par value; 900,000,000 shares authorized; 259,588,037 and 258,840,350 shares issued; and 239,620,885 and 222,867,408 shares outstanding, as of june 30, 2014 and december 31, 2013, respectively                                          647,000                          
  term note                                           209,687,000 226,875,000 233,750,000 240,625,000                      
  common stock voting, .0025 par value; 900,000,000 shares authorized; 259,046,646 and 258,840,350 shares issued; and 223,173,055 and 222,867,408 shares outstanding, as of march 31, 2014 and december 31, 2013, respectively                                           646,000                         
  investments in short-term commercial paper                                                9,998,000 64,982,000                   
  convertible senior notes                                              287,496,000                      
  common stock voting, .0025 par value; 900,000,000 shares authorized; 257,314,197 and 255,592,901 shares issued; and 221,349,383 and 219,522,655 shares outstanding, as of september 30, 2013 and december 31, 2012, respectively                                            641,000                        
  common stock voting, .0025 par value; 900,000,000 shares authorized; 256,630,645 and 255,592,901 shares issued; and 220,665,831 and 219,522,655 shares outstanding, as of june 30, 2013 and december 31, 2012, respectively                                             640,000                       
  redeemable noncontrolling interest                                              99,414,000 93,774,000 77,424,000 73,924,000 64,364,000 54,294,000 54,294,000                
  common stock voting, .0025 par value; 900,000,000 shares authorized; 256,333,083 and 255,592,901 shares issued; and 220,333,057 and 219,522,655 shares outstanding, as of march 31, 2013 and december 31, 2012, respectively                                              639,000                      
  income taxes receivable                                               939,000 17,082,000 2,833,000 24,519,000 15,295,000 6,285,000 30,413,000 35,819,000 124,950,000 125,912,000 93,475,000           
  accrued profit sharing                                               19,213,000 15,271,000 9,348,000 35,883,000 28,464,000 16,163,000 21,333,000 16,771,000 9,682,000 56,000 56,000 75,212,000 44,767,000 19,994,000 42,363,000 27,619,000 15,803,000 46,341,000 20,752,000   
  term loan                                               250,938,000 254,375,000 257,812,000                   
  7 3/8% senior notes due 2012                                                                    
  5.125% convertible senior notes due 2014                                               287,496,000                     
  6 ¾% senior notes due 2015                                               500,000,000                     
  7 ¾% senior notes due 2016                                                                    
  6 1/8% senior notes due 2019                                               400,000,000                     
  7 5/8% senior notes due 2020                                               350,000,000                     
  6 3/8% senior notes due 2022                                               350,000,000                     
  common stock voting, .0025 par value; 900,000,000 shares authorized; 255,299,134 and 255,052,811 shares issued; and 219,228,888 and 218,873,720 shares outstanding, as of september 30, 2012 and december 31, 2011, respectively                                               636,000                     
  7 3/8% senior notes, due 2012                                                  700,000,000 700,000,000 700,000,000 700,000,000 700,000,000 700,000,000 700,000,000 700,000,000 700,000,000 700,000,000 700,000,000        
  5.125% convertible senior notes, due 2014                                                287,498,000 287,500,000 287,500,000 287,500,000 287,500,000 287,500,000 287,500,000 287,500,000 287,500,000            
  6 ¾% senior notes, due 2015                                                500,000,000 500,000,000 500,000,000 500,000,000 500,000,000 500,000,000 500,000,000 500,000,000 500,000,000  500,000,000  500,000,000        
  7 ¾% senior notes, due 2016                                                500,000,000 500,000,000 500,000,000 500,000,000 500,000,000 500,000,000 500,000,000 500,000,000 500,000,000  500,000,000          
  7 5/8% senior notes, due 2020                                                350,000,000 350,000,000 350,000,000 350,000,000 350,000,000                
  common stock voting, .0025 par value; 900,000,000 shares authorized; 255,225,325 and 255,052,811 shares issued; and 219,154,966 and 218,873,720 shares outstanding, as of june 30, 2012 and december 31, 2011, respectively                                                636,000                    
  common stock voting, .0025 par value; 900,000,000 shares authorized; 255,171,906 and 255,052,811 shares issued; and 219,074,339 and 218,873,720 shares outstanding, as of march 31, 2012 and december 31, 2011, respectively                                                 636,000                   
  amortization of intangibles                                                 8,992,000   10,084,000                
  common stock voting, .0025 par value; 900,000,000 shares authorized; 255,029,406 and 254,002,799 shares issued; and 218,690,315 and 217,574,826 shares outstanding, as of september 30, 2011 and december 31, 2010, respectively                                                  636,000                  
  common stock voting, .0025 par value; 900,000,000 shares authorized; 254,987,769 and 254,002,799 shares issued; and 218,648,678 and 217,574,826 shares outstanding, as of june 30, 2011 and december 31, 2010, respectively                                                   636,000                 
  common stock voting, .0025 par value; 900,000,000 shares authorized; 254,642,621 and 254,002,799 shares issued; and 218,303,530 and 217,574,826 shares outstanding, as of march 31, 2011 and december 31, 2010, respectively                                                    635,000                
  liabilities and stockholders’ equity                                                                    
  senior secured revolving credit facility, due 2012                                                        114,000,000 231,000,000 575,000,000          
  7 5/8% notes, due 2020                                                     350,000,000 350,000,000 350,000,000             
  stockholders’ equity                                                                    
  common stock voting, .0025 par value; 900,000,000 shares authorized; 253,422,407 and 252,589,627 shares issued; and 216,994,434 and 215,999,801 shares outstanding, as of september 30, 2010 and december 31, 2009, respectively                                                     632,000               
  total steel dynamics, inc. stockholders’ equity                                                     2,091,639,000 2,083,981,000 2,044,478,000 1,910,530,000 1,524,670,000           
  total stockholders’ equity                                                     2,103,676,000 2,097,599,000 2,057,895,000 1,924,483,000 1,538,944,000 1,739,394,000 1,987,552,000 1,616,057,000 1,079,959,000 1,184,155,000 1,225,106,000 1,231,108,000 1,224,936,000 971,522,000 879,868 
  total liabilities and stockholders’ equity                                                     5,610,459,000 5,545,805,000 5,582,122,000 4,881,812,000 4,926,079,000 6,054,879,000 6,043,589,000 4,821,612,000 3,095,301,000 2,575,886,000 2,341,392,000 2,247,017,000 2,164,473,000 1,881,619,000 1,757,687 
  common stock voting, .0025 par value; 900,000,000 shares authorized; 253,233,868 and 252,589,627 shares issued; and 216,805,895 and 215,999,801 shares outstanding, as of june 30, 2010 and december 31, 2009, respectively                                                      631,000              
  common stock voting, .0025 par value; 900,000,000 shares authorized; 252,908,444 and 252,589,627 shares issued; and 216,437,175 and 215,999,801 shares outstanding, as of march 31, 2010 and december 31, 2009, respectively                                                       630,000             
  senior secured term a loan                                                           536,000,000 552,100,000        
  common stock voting, .0025 par value; 900,000,000 shares authorized; 251,398,691 and 218,733,363 shares issued; and 214,808,597 and 181,820,012 shares outstanding, as of june 30, 2009 and december 31, 2008, respectively                                                        626,000            
  other accumulated comprehensive loss                                                                    
  senior secured term a loan, due 2012                                                         487,700,000 519,900,000          
  6 3/4% senior notes, due 2015                                                         500,000,000  500,000,000         
  7 3/4% senior notes, due 2016                                                         500,000,000  500,000,000         
  common stock voting, .0025 par value; 900,000,000 shares authorized; 218,771,002 and 218,733,363 shares issued; and 182,130,997 and 181,820,012 shares outstanding, as of march 31, 2009 and december 31, 2008, respectively                                                         545,000           
  4.0% convertible subordinated notes                                                                    
  minority interest                                                          8,939,000 12,304,000 11,513,000 976,000 869,000 1,043,000 1,424,000 1,747,000 1,357,000 1,118 
  common stock voting, .0025 par value; 900,000,000 shares authorized; 218,636,669 and 217,770,922 shares issued; and 183,115,409 and 190,324,402 shares outstanding, as of september 30, 2008 and december 31, 2007, respectively                                                          544,000          
  other accumulated comprehensive income                                                           5,011,000         
  senior secured revolving credit facility                                                           201,000,000 147,000,000 97,000,000 215,000,000      
  other current maturities of long-term debt                                                           65,808,000 65,477,000        
  4.0% convertible subordinated notes, due 2012                                                           16,000,000 37,250,000        
  common stock voting, .0025 par value; 900,000,000 shares authorized; 218,551,353 and 217,770,922 shares issued; and 198,191,407 and 190,324,402 shares outstanding, as of june 30, 2008 and december 31, 2007, respectively                                                           544,000         
  common stock voting, .0025 par value; 400,000,000 shares authorized; 218,161,133 and 217,770,922 shares issued; and 188,849,999 and 190,324,402 shares outstanding, as of march 31, 2008 and december 31, 2007, respectively                                                            543,000        
  deferred taxes                                                             16,080,000 14,488,000 13,611,000  17,346,000 6,950,000  
  other accrued expenses                                                             120,429,000    72,349,000 63,041,000 80,527 
  senior secured term a loan facility                                                             495,000,000       
  9 ½% senior unsecured notes                                                                    
  6 ¾% senior unsecured notes                                                             500,000,000       
  subordinated convertible 4.0% notes                                                             37,250,000 37,500,000 37,500,000  79,995,000 110,000,000  
  unamortized bond premium                                                               3,350,000 3,772,000 4,615,000 5,037,000 5,459 
  common stock voting, .005 par value; 200,000,000 shares authorized: 108,578,346 and 107,865,486 shares issued, and 87,242,960 and 96,983,303 shares outstanding, as of september 30, 2007 and december 31, 2006, respectively                                                             541,000       
  91¤2% senior unsecured notes                                                                    
  63¤4% senior unsecured notes                                                              500,000,000      
  common stock voting, .005 par value; 200,000,000 shares authorized; 108,408,426 and 107,865,486 shares issued, and 91,923,320 and 96,983,303 shares outstanding, as of june 30, 2007 and december 31, 2006, respectively                                                              540,000      
  senior unsecured 9½% notes                                                               300,000,000 300,000,000   300,000 
  common stock voting, .005 par value; 200,000,000 shares authorized; 108,082,420 and 107,865,486 shares issued, and 94,510,185 and 96,983,303 shares outstanding, as of march 31, 2007 and december 31, 2006, respectively                                                               538,000     
  accounts receivable, net of related allowances of 6,863 and 5,727 as of december 31, 2006 and 2005, respectively                                                                355,011,000    
  accounts receivable—related parties                                                                53,365,000    
  intangible assets, net of accumulated amortization of 1,874 as of december 31, 2006                                                                12,226,000    
  accounts payable—related parties                                                                2,004,000    
  convertible subordinated 4.0% notes                                                                37,500,000   115,000 
  other secured debt                                                                16,920,000   17,960 
  common stock voting, .005 par value; 200,000,000 shares authorized; 107,865,486 and 106,111,440 shares issued; and 96,983,303 and 86,367,978 shares outstanding, as of december 31, 2006 and 2005, respectively                                                                537,000    
  current assets:                                                                    
  current liabilities:                                                                    
  senior unsecured 9 ½% notes                                                                 300,000,000   
  stockholders’ equity:                                                                    
  common stock voting, .01 par value; 100,000,000 shares authorized; 53,796,151 and 53,055,720 shares issued, and 50,556,030 and 43,183,989 shares outstanding, as of june 30, 2006 and december 31, 2005, respectively                                                                 536,000   
  senior unsecured 9.5% notes                                                                  300,000,000  
  common stock voting, .01 par value; 100,000,000 shares authorized; 53,617,457 and 53,055,720 shares issued, and 44,061,455 and 43,183,989 shares outstanding, as of march 31, 2006 and december 31, 2005, respectively                                                                  534,000  
  long-term debt:                                                                    
  common stock voting, .01 par value; 100,000,000 shares authorized; 53,055,720 and 52,435,059 shares issued; and 43,183,989 and 48,485,671 shares outstanding, as of december 31, 2005 and 2004, respectively                                                                   529 

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