CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Net sales
Unrelated parties	$ 5,964,503	$ 4,453,556	$ 11,375,304	$ 7,991,181
Related parties	248,375	11,752	407,476	18,724
Total net sales	6,212,878	4,465,308	11,782,780	8,009,905
Costs of goods sold	4,329,536	3,265,616	8,116,925	6,009,947
Gross profit	1,883,342	1,199,692	3,665,855	1,999,958
Selling, general and administrative expenses	118,377	154,379	270,392	304,160
Profit sharing	139,742	82,140	268,211	130,988
Amortization of intangible assets	7,160	7,438	14,322	14,876
Operating income	1,618,063	955,735	3,112,930	1,549,934
Interest expense, net of capitalized interest	25,667	14,898	42,336	32,167
Other (income) expense, net	(4,021)	10,039	16,447	20,110
Income before income taxes	1,596,417	930,798	3,054,147	1,497,657
Income tax expense	381,765	218,595	732,141	346,699
Net income	1,214,652	712,203	2,322,006	1,150,958
Net income attributable to noncontrolling interests	(5,098)	(9,912)	(8,521)	(18,160)
Net income attributable to Steel Dynamics, Inc.	$ 1,209,554	$ 702,291	$ 2,313,485	$ 1,132,798
Basic earnings per share attributable to Steel Dynamics, Inc. stockholders (in dollars per share)	$ 6.49	$ 3.35	$ 12.22	$ 5.39
Weighted average common shares outstanding (in shares)	186,442	209,647	189,300	210,331
Diluted earnings per share attributable to Steel Dynamics, Inc. stockholders, including the effect of assumed conversions when dilutive (in dollars per share)	$ 6.44	$ 3.32	$ 12.14	$ 5.35
Weighted average common shares and share equivalents outstanding (in shares)	187,740	211,246	190,491	211,750
Dividends declared per share (in dollars per share)	$ 0.34	$ 0.26	$ 0.68	$ 0.52