CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Total net sales	$ 5,204,858	$ 4,369,195
Costs of goods sold	4,441,635	3,882,651
Gross profit	763,223	486,544
Selling, general and administrative expenses	175,220	181,808
Profit sharing	42,198	22,695
Amortization of intangible assets	7,801	6,897
Operating income	538,004	275,144
Interest expense, net of capitalized interest	33,241	12,131
Other income, net	(8,450)	(17,641)
Income before income taxes	513,213	280,654
Income tax expense	113,108	62,975
Net income	400,105	217,679
Net loss (income) attributable to noncontrolling interests	3,331	(528)
Net income attributable to Steel Dynamics, Inc.	$ 403,436	$ 217,151
Basic earnings per share attributable to Steel Dynamics, Inc. stockholders (in dollars per share)	$ 2.79	$ 1.45
Weighted average common shares outstanding (in shares)	144,797	150,262
Diluted earnings per share attributable to Steel Dynamics, Inc. stockholders, including the effect of assumed conversions when dilutive (in dollars per share)	$ 2.78	$ 1.44
Weighted average common shares and share equivalents outstanding (in shares)	145,321	150,809
Dividends declared per share (in dollars per share)	$ 0.53	$ 0.5
Unrelated parties
Total net sales	$ 5,185,334	$ 4,241,499
Related parties
Total net sales	$ 19,524	$ 127,696